Testing a question multiple times and obtaining the same results. Option A.
Researchers justify their claims by reviewing the scientific literature and assessing the weight of evidence. Scientific claims are based on systematic observations and evidence. This is designed to be far more reliable than any other type of claim. One of his ways of assessing scientific credibility is to examine the logical structure of the arguments that scientists present for scrutiny.
Without drowning in this data we can determine whether the arguments are correctly related to the empirical data. Claims define the goal direction, and scope of an article. It is backed by evidence. Assertions must be discursive. A good claim is a focused argument on primary school because of the growing obesity epidemic. The bolder the claim the greater the risk. However, when conveying content that implies a claim.
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how is an objects velocity related to its position?
Velocity is the speed as well as direction of motion of an object. In other words, one can say that the velocity is the rate of change of position of an object.
What is velocity?Velocity is the dimensional speed of a moving artifact as an inkling of its rate of change in position as observed from a specific frame of reference and measured by a specific time standard.
Speed is the rate at which an object moves along a path in time, whereas velocity is the rate and direction of movement. In other words, velocity is a vector, whereas speed is a scalar value.
The velocity of an object is its speed as well as its direction of motion. In other words, velocity is the rate at which an object's position changes.
Thus, this way, the velocity and position of object relates with each other.
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3. Three forces are acting on an object (Figure 1. 32) which is in equilibrium. Determine force A. 1200 N 51. 3° Force A 42. 00 1400 N
Asin+1200sin51.3+1400sin42=Asin+1896 N is the resulting force in the vertical direction. This also equals zero.
When three forces are in balance, the forces are either?When a three-force member is in equilibrium, the forces must be contemporaneous if they are not parallel. As a result, the lines of action of all three forces operating on such a component must cross at some point; hence, any single force is the equilibrant of the other two forces.
When the outcome of three vectors is a Null vector, i.e. it has no magnitude and direction, the three vectors are at equilibrium. The product of three vectors equals the vector sum of the vectors.
When a thing is in equilibrium, its forces are balanced.
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What is the direction of the net force acting on an the plant that is experiencing a force of 20N in the North and a second force of 15N to the West? Report answer using Angle of Rotation (ie: 27° N of W) I need to do the following:1. Draw a free body diagram2. Identify Givens and Unknowns3. Identify the Equations4. Set up the equation using the givens and unknowns5.Solve
1. The free body diagram is shown below:
2.
Given:
F1 = 20N
F2 = 15N
Unknowns:
θ: direction of the net force = ?
3.
In order to find the unknown angle θ, use the tangent function, as follow:
[tex]\tan \theta=\frac{opposite}{adjacent}[/tex]where opposite is F1 and adjacent is F2. To obtain θ it is necessary to apply inverse tangent.
5. Then, you have:
[tex]\theta=\tan ^{-1}(\frac{20N}{15N})=53.13[/tex]Hence, the direction is 53.13 degrees to the north of the west
jake and angela are both standing on identical skateboards and perform a physics experiment in which they push off one another to move. jake is much taller and more massive than angela. if jake pushes with 20 n of force, then what force does he feel from angela?
The force Jake feels from Angela must be equal to the force he applied which is 20 N.
What is Newton's third law of motion?Newton's third law of motion states that for every action, there is an equal and opposite reaction. In other words, action and reaction are equal and opposite.
Mathematically, this law is written as;
Fa = Fb
where;
Fa is the force exerted by object A on object BFb is the reaction of object B due to force exerted by object AIf Jake pushes Angela with 20 N of force, then Angle must react with equal and opposite force of 20 N.
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Suppose you look at a star that can be seen through the edge of a dusty interstellar cloud. The star will look __________ than it would if it were outside the cloud.
The star will look dimmer and redder than it would if it were outside the cloud.
What makes up an interstellar cloud?
Interstellar clouds mostly made of dust and gas can be found in the space between the stars. In interstellar molecular clouds, over 100 molecules (neutrals, ions, and radicals), predominantly carbon-containing compounds, have been discovered.
What do you name an interstellar cloud?
A molecular cloud is an interstellar clump or cloud that is opaque due to the presence of dust grains within it. The shape of such dark clouds is exceedingly irregular: they have no clearly defined outer boundaries and, due to turbulence, can take on convoluted serpentine patterns.
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You are driving around the streets of Pittsburgh and find yourself on Canton Avenue.
While driving up this incredibly steep road, the steepest road in all of america, you find
that the total length you have driven is 31 m. At that time you also notice a roadside sign
that indicates that your elevation has increased by 10.6 m. What is the angle of the road
above the horizontal?
the angle of the road such that the alleviation is 10.6 meters and the distance traveled is 31 meters is 20°.
what are trigonometric ratios?
Trigonometric Ratios are defined as the values of all the trigonometric functions based on the value of the ratio of sides in a right-angled triangle. The ratios of sides of a right-angled triangle with respect to any of its acute angles are known as the trigonometric ratios of that particular angle.
given:
the total length you have driven is 31 m
elevation has increased by 10.6 m
if we will image the architecture of the structure that will be formed, we will see that the after joining the highest point perpendicularly downward we end up with a right-angled triangle.
if we wish to find the alleviation of the road, we can simply use trigonometric ratios.
using the sine trigonometric ratio we get,
sin (angle of alleviation) = perpendicular distance/distance travelled by the car
sin (angle of alleviation) = 10.6/31
sin (angle of alleviation) = 0.341
sin (angle of alleviation) = 19.93°
therefore, the angle of the road such that the alleviation is 10.6 meters and the distance traveled is 31 meters is 20°.
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what centripetal force is needed to keep a 2 kg sack of flour moving at a constant speed of 4 m/s in a circle having a radius of (a) 4 meters (b) 8 meters?
Centripetal force needed to keep the 2 kg sack of flour (a) in a circle of radius 4 meters is 8 N and (b) in a circle of radius 8 meters is 4 N.
What is centripetal force?Centripetal force can be defined as a necessary force acting of a body moving in circular or curved path in the direction of inwards towards a fixed point. Due to having both magnitude and direction, it is a vector quantity. SI unit of centripetal force is Newton (N).
We know that.
centripetal force = [tex]\frac{mv^{2} }{r}[/tex]
Where,
m = mass of the moving object.
v = speed of the moving object.
r = radius of the circular path.
Given,
Mass of the sack of flour = m= 2 kg.
Speed of the moving object = v = 4 m/s.
Now for condition (a),
When, radius of the circular path = r = 4 meter.
Required centripetal force = [tex]\frac{mv^{2} }{r}[/tex] = [tex]\frac{2*4*4}{4}[/tex] N = 8 N.
And, for condition (b),
When, radius of the circular path = r = 8 meter.
Required centripetal force = [tex]\frac{mv^{2} }{r}[/tex] = [tex]\frac{2*4*4}{8}[/tex] N = 4 N.
So, required centripetal force for conditions (a) and (b) respectively 8N and 4 N.
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a small ferry boat is 4.00 m wide and 6.00 m long. when a loaded truck pulls onto it, the boat sinks an additional 3.80 cm into the river. what is the weight of the truck?
The weight of the truck that cause the ferry sinks an additional 3.8 cm is equal to the weight of the displaced water, that is 9120 N
According to the Archimedes Principle, the buoyant force is equal to the weight of the water displaced by the boat.
Using the formula:
F = ρ . g. V
Where:
F = buoyant force
ρ = mass density of the fluid
g = acceleration due to gravity
V = volume of the displaced water
Assume that the mass density of water is 1000 kg/m³. Hence,
F = 1000 . 10. (4 x 6 x 0.038) = 9120 N
The truck's weight is equal to the weight of displaced water, hence it is 9120 N
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What happens to the amount of speciman you can see as you switch to low power to high power?
Answer: Each time you switch to a higher power, the depth of focus is reduced. Therefore a smaller part of the specimen is in focus at higher power. The amount of light transmitted to your eye is greatest at the low power.
Explanation:
what is the acceleration of the ball when it is moving up, when it is at the maximum height, and when it is moving down? (note: the acceleration graph is shown in red.)
The acceleration of the ball when it is moving up, at the highest point and when moving down is always constant and in downward direction.
When a ball is thrown upward, its acceleration is always constant.
When a ball is thrown, it is under the influence of gravity, the acceleration working on the ball is due to earth.
The acceleration given by the earth is called Acceleration due to gravity. When the ball is going upward. The acceleration is opposite to the motion of the ball. When the ball is moving downwards, the acceleration is in the direction of the motion of the ball.
When the ball is at highest point, the acceleration is still downwards.
Throughout the motion, the acceleration is constant in terms of direction as well as magnitude.
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Describe how the motions of the particles that make up an object change when the object's
temperature increases.
Answer:
faster
Explanation:
With an increase in temperature, the particles gain kinetic energy and move faster. The actual average speed of the particles depends on their mass as well as the temperature – heavier particles move more slowly than lighter ones at the same temperature
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29.In which of the following pictures is the average kinetic energy of molecules the highest?Select one:a. Ab. Bc. Cd. D
We will have that the picture that shows the highest average kinetic energy is image B.
in a certain nuclear reactor, neutrons suddenly collide with carbon nuclei, which have 12 times the mass of neutrons. in a head-on elastic collision with a stationary carbon nucleus, what fraction of its initial speed does the neutron have after the collision?
carbon atomic mass Equals m2
neutron mass = M,
as mg 12m1 = the speed of the neutron following a collision
m1 - m2 / m1 + m2 * u1 = v1
= [(-12m1+m1) / 13m1] * u1
= [(-12+1) 13] * u1
v1 = -11/13*u1
Neutron speed equals 11/13 starting speed.
Response: 11/13
A nuclear reactor is a device used to start and regulate nuclear chain reactions involving fission or nuclear fusion. Nuclear reactors are used in nuclear power plants to produce electricity and in nuclear propulsion for ships.
The neutron, symbol n or n0, is a subatomic particle with a neutral charge and slightly more mass than a proton. Atomic nuclei consist of protons and neutrons.
The element with atomic number 6 carbon has small, straightforward atoms. Six positively charged protons make up the nucleus, and there are six electrons outside the nucleus that are split between two shells.
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100 POINTA essay: write an essay that describes why asexual reproduction results in offspring that are identical to the original and why sexual reproduction results in diverse and unique offspring. ( please write at least 5 to 6 sentences.)
In asexual reproduction, the number of chromosomes is constant between the parent and the children, and because all of the offspring share a similar morphology, they are referred to as clones.
Why does asexual reproduction produce offspring that are identical to the originals?The primary distinction between the two is that while sexual reproduction results in children with distinctive morphological traits, asexual reproduction yields offspring that are identical to the parent.A single parent divides into multiple offspring during asexual reproduction through mechanisms like fission, budding, or sporulation. Meiosis is the process through which sexually reproducing organisms create their offspring.In asexual reproduction, the number of chromosomes is constant between the parent and the children, and because all of the offspring share a similar morphology, they are referred to as clones.The offspring receives only half as many (haploid) chromosomes from the parent during meiosis. As a result, it shares traits with both of its parents.Even eukaryotes like yeast and fungi and most prokaryotes like bacteria typically reproduce asexually.To learn more about : Asexual reproduction,
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Answer:Using models, such as electronic simulations, physical models, or drawings, students will learn that genes are located in the chromosomes of cells and each chromosome pair contains two variants of each gene. Students will need to make distinctions between chromosomes and genes and understand the connections between them. DNA will be introduced in high school. Students will learn that chromosomes are the genetic material that is found in the nucleus of the cell and that chromosomes are made up of genes. They will also learn that each gene chiefly controls the production of specific proteins, which in turn affect the traits of the individual.
Students should be given opportunities to use student-developed conceptual models to visualize how a mutation of genetic material could have positive, negative, or neutral impact on the expression of traits in organisms. Emphasis in this unit is on conceptual understanding that mutations of the genetic material may result in making different proteins; therefore, models and activities that focus on the expression of genetic traits, rather than on the molecular-level mechanisms for protein synthesis or specific types of mutations, are important for this unit of study. For example, models that assign genetic information to specific segments of model chromosomes could be used. Students could add, remove, or exchange genes located on the chromosomes and see that changing or altering a gene can result in a change in gene expression (proteins and therefore traits).
Students will continue this unit of study by describing two of the most common sources of genetic variation, sexual and asexual reproduction. Students will be able to show that in sexual reproduction, each parent contributes half of the genes acquired by offspring, whereas in asexual reproduction, a single parent contributes the genetic makeup of offspring. Using models such as Punnett squares, diagrams, and simulations, students will describe the cause-and-effect relationship between gene transmission from parents(s) to offspring and the resulting genetic variation. Using symbols to represent the two alleles of a gene, one acquired from each parent, students can use Punnett squares to model how sexual reproduction results in offspring that may or may not have a genetic makeup that is different from either parent. Students can observe the same mixing of genetic information using colored counters or electronic simulations. Using other models, students can show that asexual reproduction results in offspring with the same combination of genetic information as the parents.
Students can summarize the numerical data they collect during these activities as part of their description of why asexual reproduction results in offspring with identical genetic combinations and sexual reproduction results in offspring with genetic variations. As a culmination of this unit of study, students could make multimedia presentations to demonstrate their understanding of the key concepts. Students could participate in a short research project and cite the specific textual evidence used to support the analysis of any scientific information they gather. They could integrate quantitative or technical information as part of their presentation. For example, students can take data collected during investigations of genetic mutations and provide a narrative description of their results. They could use data collected during their investigation of sexual and asexual reproduction. They could also include diagrams, graphs, or tables to clarify their data.
• Cite specific textual evidence to support analysis of science and technical texts about structural changes to genes (mutations) located on chromosomes that may affect proteins and may result in harmful, beneficial, or neutral effects to the structure and function of the organism.
• Determine the meaning of symbols, key terms, and other domain-specific phrases as they are used to describe why structural changes to genes (mutations) located on chromosomes may affect proteins and may result in harmful, beneficial, or neutral effects to the structure and function of the organism.
• Integrate quantitative or technical information about why structural changes to genes (mutations) located on chromosomes may affect proteins and may result in harmful, beneficial, or neutral effects to the structure and function of the organism that is expressed in words with a version of that information expressed visually in a flowchart, diagram, model, graph, or table.
• Include multimedia components and visual displays in presentations about structural changes to genes (mutations) located on
Explanation:
Ricardo starts from rest and runs for 12 seconds. He reaches a final velocity of +9 m/s. Find Ricardo’s acceleration.
Answer:
Assuming his Acceleration is constant and consistent, he accelerates at .75 m/s^2
Explanation:
If silicon-28 becomes silicon-29, how do you know that it gained a neutron and not a proton?
If silicon-28 becomes silicon-29, we know that it gained a neutron and not a proton because all isotopes have same atomic number but different atomic mass.
Number of protons = Atomic number
So, even though the isotopes of silicon differ, the atomic number is same for all the isotopes. So number of protons is neither gained nor lost in different isotopes of the same element.
Atomic mass = Number of Protons + Number of Neutrons
Number of Neutrons = Atomic mass - Number of Protons
Since the atomic mass differs for different isotopes, the number of neutrons varies in different isotopes.
Therefore, if silicon-28 becomes silicon-29, we know that it gained a neutron and not a proton because all isotopes have same atomic number but different atomic mass.
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1. What is the slope of the graph below?
position (m)
30
20
10
O
5 10
15
time (s)
Answer:
type good your question
two people x and y stand in a straight line at a distance of 330metres and 660metres from a high wall respectively find the time interval taken for x to hear the first and second echo sounds when y makes a loud sound
As a result, it stands to reason that the speed of sound in air and other gases should be proportional to the square root of temperature. While not insignificant, this is not a significant dependence. The speed of sound at 0°C is 331 m/s, while at 20.0 °C it is 340m/s, a 4% increase.
Time interval taken for x to hear the first = 660-330/340
=330/340 = .97 sec
time interval taken for x to hear second echo sounds = 660+330 / 340
= 2.91 sec
interval taken for x to hear the first and second echo sounds = 2.91 -.97
= 1.94 sec.
What is velocity of sound ?As a result, it stands to reason that the speed of sound in air and other gases should be proportional to the square root of temperature. While not insignificant, this is not a significant dependence. The speed of sound at 0°C is 331 m/s, while at 20.0 °C it is 343 m/s, a 4% increase.Determine the wavelength of the sound corresponding to the note of middle C, assuming the speed of sound in air is 340 m/s. Allow = wavelength. Use v = f •, where v equals 340 m/s and f equals 256 Hz. Rearrange the equation so that it looks like = v / f.speed of sound = 340 m /s..
Time interval taken for x to hear the first = 660-330/340
=330/340 = .97 sec
time interval taken for x to hear second echo sounds = 660+330 / 340
= 2.91 sec
interval taken for x to hear the first and second echo sounds = 2.91 -.97
= 1.94 sec.
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a driver shifts into neutral when her 1500 kg car is moving at 30 m/s and finds that her speed has dropped to 20 m/s ten seconds later. how great was the force of friction which acted to slow her car?
The force of friction acted to lift the car is 1500N.
The push or pull on a mass-containing item changes its velocity. An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude.
We are given that,
The mass of the car = m = 1500kg
The initial speed of the car = Vin = 20m/s
The final speed of the car = Vf = 30m/s
The total time taken is = t = 10 second
Therefore , to calculate the force that acted on the car is by the equation i.e.
Force = (change in momentum)/(time)
net F = [m (Vf -Vin)]/t
net F = [1500kg(30m/s -20m/s)]/10sec
net F = 1500N
Since, the total force of friction to slow the car will be 1500N
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electromagnetic radiation with a wavelength of 745 nm appears as red light to the human eye. the energy of one photon of this light is 2.67 × 10-19 j. thus, a laser that emits 1.3 ×10-2 j of energy in a pulse of light at this wavelength produces photons in each pulse. electromagnetic radiation with a wavelength of 745 nm appears as red light to the human eye. the energy of one photon of this light is 2.67 × 10-19 j. thus, a laser that emits 1.3 ×10-2 j of energy in a pulse of light at this wavelength produces photons in each pulse. 3.6 × 1019 6.5 × 1013 4.9 ×1016 4.7 × 10-24 2.1 × 10-17
Photons are massless.
What is electromagnetic radiation?
Electromagnetic radiation consists of electromagnetic field-propagating waves that carry electromagnetic radiant energy. Radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays are included. All of these electromagnetic waves comprise the electromagnetic spectrum.
Given that:
E= Energy
h= Plank's constant = 6.6*10^-34 Js
c= speed of light = 3*10^8 m/s
E=hv = hc/λ
λ=745 nm = 745*10^-9 m
E=6.6*10^-34 * 3*10^8/745*10^-9
E= 2.657* 10^19 = 2.66* 10^19 J
hence, the energy of one photon of this light is 2.66* 10^19 J
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Correct question:
Electromagnetic radiation with a wavelength of 745 nm appears as a red light to the human eye. The energy of one photon of this light is............... A) 2.67 x 10-28 B) 2.67 x 10-19 C) 1.48 x 10-22 D)1.48 × 10-31 E) 3.75 × 1018
a 36 kg man holding a 0.548 kg ball stands on a frozen pond next to a wall. he throws the ball at the wall with a speed of 15.8 m/s (relative to the ground) and then catches the ball after it rebounds from the wall. how fast is he moving after he catches the ball? ignore the projectile motion of the ball, and assume that it loses no energy in its collision with the wall. answer in units of m/s.
The final velocity of the man would be 2.11 m/s in the opposite direction of the motion.
Information provided,
Mass of the man [M] = 36 kg
Mass of the ball [m] = 0.548 kg
Speed of the ball [v] = 15.8 m/s
As of, the conservation of the momentum
MV + mv = 0
[36 × V] + [0.548 × 15.8] = 0
36V = -8.6584
V = -0.2405 m/s
The sign shows that the direction of the man is opposite to the direction of the ball.
After rebounded the direction of the ball would change
MV + m[-v] = [m+M] × [tex]V_{f}[/tex]
MV - mv = [m+M] × [tex]V_{f}[/tex]
[36 × -0.2405] - [0.548 × 15.8] = [36 + 0.548] × [tex]V_{f}[/tex]
-8.658 - 8.6584 = 36.548 × [tex]V_{f}[/tex]
-17.3164 = 36.548 × [tex]V_{f}[/tex]
[tex]V_{f}[/tex] = -2.1106 m/s
The final velocity of the man would be 2.11 m/s in the opposite direction of the motion.
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You throw a ball upward with an initial speed of 4.8 m/s . When it returns to your hand 0.98 s later, it has the same speed in the downward direction.What was the average acceleration vector of the ball?
Answer:
a = (V2 - V1) / t average acceleration between points 1 & 2
V2 = speed at bottom = -4.8 m/s
V1 = 4.8 m/s speed when thrown, choosing upwards as positive
a = (-4.8 - 4.8) / .98 time upwards = time downwards
a = -9.6 m/s / .98 s
a = -9.8 m/s^2
PLEASE HELP!! WILL MARK BRAINLIEST!!
The resultant vector for A + B is 13.5, for B + A is 13.5, for C + D is 6.1 and for A + B + C + D is 13.55
When 2 vectors are at an angle with each other,
R² = A² + B² + 2ABcosθ
A = 10
B = 4
C = 5
D = 5
1 ) For A + B,
θ = 35°
R² = 10² + 4² + ( 2 * 10 * 4 * cos 35° )
R² = 100 + 16 + 65.6
R² = 181.6
R = 13.5
2 ) For B + A,
The resultant vector will be the same as A + B,
R = 13.5
3 ) For C + D,
θ = 105°
R² = 5² + 5² + ( 2 * 5 * 5 * cos 105° )
R² = 25 + 25 - 13
R² = 37
R = 6.1
4 ) For A + B + C + D,
Resolving A into its X and Y components,
A[tex]_{x}[/tex] = A cos 35°
A[tex]_{x}[/tex] = 10 * 0.82
A[tex]_{x}[/tex] = 8.2
A[tex]_{y}[/tex] = A sin 35°
A[tex]_{y}[/tex] = 10 * 0.57
A[tex]_{y}[/tex] = 5.7
Resolving C into its X and Y components,
C[tex]_{x}[/tex] = C cos 75°
C[tex]_{x}[/tex] = 5 * 0.26
C[tex]_{x}[/tex] = 1.3
C[tex]_{y}[/tex] = A sin 75°
C[tex]_{y}[/tex] = 5 * 0.97
C[tex]_{y}[/tex] = 4.85
X = A[tex]_{x}[/tex] + B + C[tex]_{x}[/tex] - D
X = 8.2 + 4 + 1.3 - 5
X = 8.5
Y = A[tex]_{y}[/tex] + C[tex]_{y}[/tex]
Y = 5.7 + 4.85
Y = 10.55
R² = X² + Y²
R² = 8.5² + 10.55²
R² = 72.25 + 111.3
R = √ 183.55
R = 13.55
Therefore, the resultant vector for,
A + B = 13.5B + A = 13.5C + D = 6.1A + B + C + D = 13.55To know more about resultant vector
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A cannonball is launched horizontally from the top of a cliff 10.4 meters high, and lands
20.8 meters away from the base of the cliff. What is the horizontal velocity (vx) with
which the cannonball was launched?
The horizontal velocity with which the Cannonball was launched is 14.28m/s .
What is velocity?
velocity is defined as the rate of change of displacement of the body.
mathematically,
v = s/t
where, v is velocity,
s = displacement
t = time
Given,
A cannonball is launched horizontally from the top of cliff which is 10.4 meters high.
and it lands 20.8 meter away from the base of the cliff.
Here, h = 10.4 m and x = 20.8 m
According to the formula of the projectile fired horizontally from a certain height,
x = u ×√(2h/g)
20.8 = u × √(2×10.4/9.8)
20.8 = u × 1.456
u = 20.8/1.456 = 14.28 m/s
Thus,the horizontal velocity with which the Cannonball was launched is 14.28m/s .
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the angle of projection at which the horizontal range and maximum height of projectile are equal is
The angle of projection at which the horizontal range and maximum height of projectile are equal is 75.96⁰
What is horizontal distance or range of a projectile?
The horizontal distance or range of a projectile is the maximum horizontal distance travelled by the projectile.
Mathematically, the formula for the range of a projectile is given as;
R = u²sin2θ/g
where;
u is the velocity of the projectileθ is the angle of projectiong is acceleration due to gravityThe maximum height travelled by a projectile is given as;
H = u²sin²θ/2g
Solve the two equation together;
u²sin2θ/g = u²sin²θ/2g
2u² sinθcosθ = u²sin²θ/2g
4cosθ = sinθ
4 = tanθ
θ = arc tan(4) = 75.96⁰
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If you were to take a voyage across the milky way, in what kind of material would you spend most of your time?.
You spend most of your time in warm, rarefied clouds of atomic hydrogen
What is milky way?
Our solar system is part of a galaxy called the Milky Way[b], which gets its name from how it appears to us on Earth: as a hazy strip of light in the night sky made up of stars that are too close together to be seen individually. The phrase Milky Way is a translation of the Latin route lactea from the Greek o (galaktikos kklos), meaning "milky circle"[18][19][20]. From Earth, the Milky Way appears as a band because its disk-shaped structure is seen from within. Using his telescope, Galileo Galilei first distinguished the band of light in 1610. Most astronomers believed that the Milky Way contained all of the stars in the Universe up until the early 1920s.
Back then, instead of being obscured by the glare of city lights, everyone in the world could look up at night and see a dark, starry sky. When people looked up at the starry sky in those prehistoric times, they noticed a ghostly strip of light arcing across the skies from horizon to horizon. With the changing of the seasons, this lovely arc of light travelled across the sky. Even the most casual observers of the sky may see that portions of the band are hidden by what we now know to be massive dust clouds.
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you stand on a bridge above a river and drop a rock into the water below from a height of 53m (assuming no air resistance)
Given:
Height = 53 m
Given that the rock is dropped from the top of a bridge above the river, let's answer the following questions:
• (a). The acceleration of the rock as it falls.
Since the rock is in free fall, the acceleration of the rock as it falls will be the acceleration due to gravity.
a = 9.8 m/s²
Therefore, the acceleration of the rock as it falls is 9.8 m/s².
• (b). How long does it take to hit the water?
To find the time, apply the formula:
[tex]s=ut+\frac{1}{2}at^2[/tex]Where:
s = 53 m
t is the time
a is the acceleration
u is the initial velocity = 0 m/s
Let's solve for the time, t:
[tex]\begin{gathered} 53=0(t)+\frac{1}{2}*9.8*t^2 \\ \\ 53=4.9t^2 \\ \\ t^2=\frac{53}{4.9} \\ \\ t=\sqrt{10.82} \\ \\ t=3.29 \end{gathered}[/tex]Therefore, the time is 3.29 seconds.
(c). If the rock is dropped horizontally instead, there will be no change in the vertical velocity.
The time will also not change.
The time will be 3.29 seconds
ANSWER:
(a). 9.8 m/s^2
(b). 3.29 seconds
(c). 3.29 seconds
what happens to the particles in the ice cream as it freezes
The particles in the ice cream as it freezes will come together.
What is freezing?
Freezing is a phase change that occurs in liquid substances, where a liquid turns into a solid when its temperature is lowered below its freezing point.
When a liquid substance freezes, the particles of the substance comes together because the mean distance between the particles has been reduced due to decrease in temperature.
If we consider ice cream, when it freezes as a result decrease in temperature, it solidifies because the molecules are closer to each other.
Thus, when the temperature of an ice cream reduces, the ice cream will solidify.
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Question 7 options:
A. Fa =190 N, T= 78 N
B. Fa =98 N, T= 140 N
C. Fa =30 N, T= 40 N
D. Fa =75 N, T= 100 N
Minimum force human must exert to so that 14 kg mass do not accelerate downward and hit on head is 98 N. Tension in the string is 140 N.
What is acceleration?
The rate at which an item changes its velocity is known as acceleration, a vector quantity. If an object's velocity is changing, it is acceleration.
Given in the question two masses each of mass 4 kg and 14 kg so net force due gravity on the masses is 98 N, because two mass is hanging one going up one down so resultant force is 98 N. So minimum force required so that 14 kg do not hit on head is 98 N.
Tension on the string is equal to 140 N
Minimum force human must exert to so that 14 kg mass do not accelerate downward and hit on head is 98 N. Tension in the string is 140 N.
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what must be the rotation speed (revolutions per day) if an effect equal to gravity at the surface of the earth (say 0.90 g ) is to be felt?
The Earth's rotation produces an outward centrifugal force that is greater at equatorial latitudes than at polar latitudes.
What is acceleration?The rate at which an item changes its velocity is known as acceleration, a vector quantity. If an object's velocity is changing, it is acceleration.
The net acceleration that objects get as a result of the combined action of gravity and centrifugal force is known as the Earth's gravity, or g. It is a vector quantity whose strength or magnitude is determined by the norm and whose direction correlates with a plumb bob.
The Earth's rotation produces an outward centrifugal force that is greater at equatorial latitudes than at polar latitudes. This lowers the apparent downward acceleration of falling objects by somewhat counteracting the Earth's gravity, up to a maximum of 0.3% at the Equator.
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