The statement that describes at t =5 second is is the object speed up.
According to Newton's second law of motion, the acceleration of a body is equal to the net force acting on the body divided by its mass, a = Fm. This acceleration equation can be used to calculate the acceleration of an object if the mass of the object and the net force acting on it are known. The only acceleration of the projectile is the downward acceleration due to gravity.
The projectile has a vertical acceleration of 9.8 m/s/s throughout its trajectory. This acceleration value is constant. This means that the vertical velocity changes by the same amount every second. Instantaneous velocity is the speed of an object at a particular point in time. If the velocity is constant the average velocity for any time interval will not differ from the instantaneous velocity at that point in time.
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2. Answer these questions about food safety: How many foods can be cooked at less than 150 degrees and be safe? How many foods need to be cooked at temperatures above 150 degrees to be safe? How many foods need a rest time? What is the purpose of the rest time? List at least five different foods that you or a family member eat or cook.
Food is any substance consumed to provide nutritional support for an organism.
Food is important because it provides nutrients, these nutrients in turn provide: energy for activity, growth, and all functions of the body.
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When the positively charged rod Q is brought close to rod R, rod R moves away from rod Q.
Which conclusion can be made from this observation?
A Rod R is charged, but it is not possible to identify the sign of the charge.
B Rod R must be positively charged.
C Rod R must be negatively charged.
D Rod R is uncharged.
Answer:
B rod r is positively charged
Which of the picture demonstrates a state of matter wirh a fixed shape and a fixed volume
Answer:
option (j) because the particles are tightly packed and it's clear in the pic that it has fixed shape and there is no space to move
a box on a rough surface has a weight of 100 n. you apply a horizontal force of 12 n (taking the positive direction to the right), but the box does not move. what is the static friction force on the box? the static friction coefficient is 0.25.
The static friction force on the box is 25 N.
What is the definition of static friction?Static friction is a type of friction force that acts on the body when there is no relative motion between the object and the surface. As a result, even when the body is moving, it can still act. However, there shouldn't be any relative motion.
Weight of box W = mg = 100 N
Static friction coefficient = 0.25
Forces acting on box are I) Weight of box mg downwards, 2) Normal force on box N upwards 3)Friction force fs to the left and 4) Applied force P to the right.
N-mg=0⇒ N = mg
Net force acting on box in the vertical direction is zero,
[tex]f_{s}[/tex] ≤ [tex]\mu_{s}[/tex] N⇒[tex]f_{s}[/tex] ≤ [tex]\mu_{s}[/tex]mg⇒[tex]f_{s,max}[/tex] = [tex]\mu_{s}[/tex]mg
Net force acting on box in the horizontal direction is P - [tex]f_{s}[/tex] = 0⇒P= [tex]f_{s}[/tex] (until the box starts moving)
For the the box to move P = [tex]f_{s,max}[/tex]
P= [tex]\mu_{s}[/tex]mg = 0.25 × 100 = 25 N.
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A virtual image in a location the light doesn’t actually reach
Answer:14p +4q-2r
Explanation:
Sum of (10p-r+5p+2q)
10p+5p+2q-r
15p+2q-r
Now subtract( p-2q+r) from (15p+2q-r)
(15p+2q-r) - (p-2q+r)
15p+2q-r-p+2q-r
15p-p+2q+2q-r-r
14p +4q-2r
The answer is 14p +4q-2r
As a battery is used to charge a capacitor, does the overall charge inside the battery get smaller, greater, or stay the same?.
When a battery is used to charge a capacitor, does the battery's total charge get smaller.
What is capacitor?A device without an element is referred to as a capacitor. The capacitance of a capacitor is defined as the ratio of the charge stored in either of its conductors to the potential difference between them. It is assumed that an earthed conductor's capacitance will visibly rise when it is moved close to another conductor in order for a capacitor to work. As a result, a capacitor has two plates with equal and opposing charges that are spaced apart from one another.
When a battery is used to charge a capacitor, electrons that will eventually gather on one plate and become negatively charged are given energy. The opposite plate then acquires a positive charge.
Additionally, this electron is not coming from a battery. When a battery is discharged, its energy has been consumed.
Therefore, while charging a capacitor, the battery's overall charge remains constant.
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An astronaut on the moon weighs approximately 1/6 as much as on earth. How will the astronaut’s inertia change on the moon?.
The astronaut's inertia will not change on the moon.
What is inertia?Inertia can be defined as the property of a matter that causes a matter to be at rest or continuous motion in a straight line.
Inertia depends on the mass of an object, the more massive an object is, the greater the inertia and the smaller the mass of an object, the lesser the inertia.
The weight of an object is given as the product of mass and acceleration due to gravity.
W = mg
where;
m is the mass of the objectg is acceleration due to gravityThe mass of the astronaut will be constant, only the weight will change due to difference in the value of acceleration due to gravity.
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a car accelerates from 6 m/s to 22.0 m/s at a rate of 3.00 m/s2. how far does the car travel while accelerating?
The total distance traveled by the car when accelerating at a rate of 3 m/s² is 74.67 meters.
Acceleration is the rate at which an object's velocity with respect to time changes. Acceleration is a vector quantity. The direction of the net force acting on an object determines the direction of its acceleration.
The car accelerates from 6 m/s to 22 m/s.
Therefore,
The initial velocity of the car, u = 6 m/s
The final velocity of the car, v = 22 m/s
The acceleration of the car, a = 3 m/s²
By using the equation of motion,
v² - u² = 2as
s = ( v² - u² ) / 2a
s = ( 22² - 6² ) / 6
s = ( 484 - 36 ) / 6
s = 448 / 6
s = 74.67 meters
The car travels 74.67 meters while accelerating.
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how much force is needed to lift a 24-kg mass??
pls, i need help loll
Answer:lol
Explanation:
7. A ball is thrown horizontally from the roof of a building 50. m tall and lands
45 m from the base. What was the ball's initial speed?
The initial speed of the ball is 14.08m/s
We are given that,
The height of the building = h = 50m
The distance of land from base = d = 45m
Therefore, for getting the value of the initial speed v , first we have to know the time period of the ball that is thrown from building horizontally, so that taking the equation of motion in term of time and distance, then we can write as,
h = ut + (1/2) at²
Where, h is the height of the building , u is the initial speed that can be taken zero, a is the acceleration due to gravity which can be put as 9.8m/s²
50m = 0 + (1/2) (9.8m/s² )(t²)
(t²) = 10.204 s
t = 3.194 s
Thus , the initial speed of the ball in the horizontal direction can be calculated as,
Speed = distance/time
v = 45m / 3.194s
v = 14.08 m/s
Since, the initial speed of the ball would be 14.08m/s.
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What observational evidence supports the conclusion that most of the mass of the milky way is in the form of dark matter?.
The orbital speeds of stars far from the galactic center are surprisingly high.
What is milky way ?
The galaxy that contains our Solar System is known as the Milky Way[b], and its name refers to how it appears to us on Earth: a hazy strip of light in the night sky made up of stars that are too close together to be seen individually. The name Milky Way comes from the Latin route lactea, which is a translation of the Greek o (galaktikos kklos), which means "milky circle"[18][19][20]. From Earth, the Milky Way looks as a band because its disk-shaped structure is seen from the inside. Most astronomers believed that the Milky Way held all of the universe's stars until the early 1920s.
The orbital speeds of stars and gas clouds far from the galactic center are surprisingly high suggesting that these stars and gas clouds are feeling gravitational effects
The name of the galaxy that contains our Solar System, the Milky Way[b], refers to how it appears to us on Earth: a hazy strip of light visible in the night sky made up of stars that are too dim to be seen individually. The phrase "Milky Way" is a translation of the Latin route lactea, from the Greek o (galaktikos kklos), which means "milky circle"[18][19][20]. The Milky Way is seen as a band from Earth because its disk-shaped structure is seen from the inside. In 1610, Galileo Galilei used his telescope to break the band of light into individual stars for the first time. The majority of astronomers believed that the Milky Way held every star in the Universe up until the early 1920s.
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Please Help, Please show all work! I would really appreciate it.
The acceleration of the object is obtained as -1 m/s^2.
What is the acceleration?We have to recall that acceleration would be defined as the rate at which the velocity can be changed at a given time. We should now look at the formula that could help us to get the acceleration of the object.
a = v - u/t
a = acceleration
v = final velocity
u = initial velocity
t = time taken
Thus we can now be able to correctly carry out the substitution of the values and we have;
a = 2 - 7/5
a = -1 m/s^2
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What is MOST likely TRUE about a person who has a healthy diet?
The MOST likely TRUE about a person who has a healthy diet is they avoid all fats and sugars (Option B).
What is a healthy diet?A healthy diet is one that includes macronutrients (i.e. proteins, carbohydrates and lipids or fats) and micronutrients (vitamins and minerals) in a suitable amount. It is well known that fats and sugars may provide calories but they do not contain nutrients and therefore should be avoided in a healthy diet.
Therefore, with this data, we can see that a healthy diet is based on the consumption of foods that contain a suitable amount of macronutrients and micronutrients.
Complete question:
What is MOST likely TRUE about a person who has a healthy diet?
OA. They eat occasional treats.
OB. They avoid all fats and sugars.
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adjustment of the lens by the ciliary body: a.photophobia b.refraction c.amblyopia d.accommodation e.binocular vision
Adjustment of the lens by the ciliary body is accommodation.
The correct option is D.
Briefing:The lens is stretched and its refractive strength is changed by the zonule, a collective term for the suspensory ligaments that the ciliary bodies anchor. Relaxation of the zonule allows for accommodation for nearby items.
What is ciliary body of the eye?A section of the central portion of the eye's wall. The ring-shaped muscle that modifies the curvature of the lens whenever the eye focuses is part of the ciliary body, which is located behind the iris. Additionally, it creates the transparent liquid that fills the area between the iris and the cornea.
What materials makes up the ciliary body?There are muscles, blood vessels, and epithelium in the ciliary body.
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If a star is moving towards earth,it is
Answer:
Explanation:
If a star is moving toward Earth, it is blue-shifted. Light is an electromagnetic wave that has a range of colors
HELP PLEASE!! *ILL GIVE BRAINLIEST*
An unattended car rolls slowly across an empty parking lot. Consider the following two cases: case 1, the car hits a light pole and comes to rest; case 2, the car hits a pile of plastic garbage bags and comes to rest. (a) Is the impulse in case 1 greater than, less than, or equal to the impulse in case 2? (b) Is the average force in case 1 greater than, less than, or equal to the average force in case 2?
Reaction distance plus braking equals stopping distance. The published road brake performance tests for almost all contemporary production vehicles show stopping distances from 60 mph that are typically 120 to 140 feet, well under half of the anticipated safety distances.
How does stopping distance at 60 mph get calculated?
The anticipated stopping distance for a car at 60 mph is 73 meters (240 feet), or 18 car lengths overall. This measurement combines the braking distance of 55 meters and the thinking distance of 18 meters.
Your overall stopping distance is at least 268 feet at 50 mph. The total of the 268 feet is composed of: 55 Feet for Perception. 55 feet for a response.
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How do we know light is a kind of wave?
A wave is a disturbance that travels from one point to another in a medium. This disturbance can also be referred to as variation in energy. Light consists of energy derived from oscillating magnetic and electric fields. As light moves, it carries this energy from the source to another location. Also, waves have frequency and wavelength. Given these characteristics of light, we can conclude that
light is a kind of wave
At the micro level, what is the difference between an unmagnetized iron nail and a magnetized iron nail?.
The main difference in between magnetized and unmagnetized iron nails is the alignment of the magnetic domains.
What is magnetization?
The density of induced or permanent dipole moments in a specific magnetic material is measured by magnetization, also known as magnetic polarisation. We already know that the magnetic moment, which would be produced by the motion of electrons within atoms, the spin of electrons, or the nuclei, results in magnetization. In addition to any unbalanced magnetic dipole moment that is present due to the motion of the material's electrons, as was previously mentioned, the response of the a material to a external magnetic field determines its net magnetization. We can categorise materials according to their magnetic properties with the aid of the concept of magnetization. We will learn further about magnetization as well as the idea of magnetic intensity in this section.
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What does it mean if the percent transmittance of light through a sample is 100% at a given wavelength?.
If all the light passes through a solution without any absorption, then absorbance is zero, and percent transmittance is 100%. If all the light is absorbed, then percent transmittance is zero, and absorption is infinite.
What does a high percent transmittance mean?
A surface will let more light to pass if the % transmittance number is high. Similar to this, if the % transmittance number is low, it indicates that the surface absorbs more light.
If you move the light from a block of semitransparent glass. Let's imagine that the glass surface reflects 30 percent of the light. 70% of the light will attempt to pass through the glass block. However, part of the light will be absorbed by the light molecules. Say there is 35% light. Now the other side of the block will let through the final 35% of the light. It denotes a 35% transmittance for the glass block.
Hence, If all the light is absorbed, then percent transmittance is zero, and absorption is infinite.
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Draw a electric circuit powered by 3 cells with a light, a
motor and a resistor that are in parallel, with a switch that turns
all of them on or off, with a voltmeter measuring the voltage of
the 3 cells and an ammeter measuring the current flowing into
the light
Answer:
See sketch below
Explanation:
Here is a quick sketch:
a ice block floating in a river is pushed through a displacement along a straight embankment by rushing water, which exerts a force on the block. how much work does the force do on the block during the displacement?
The amount of work that the force do on the block during the displacement is 4950 Joules.
The work done by a body is given by
W = F.S
Where,
W is the work done,
F is the force applied,
S is the displacement.
Work done is a scalar quantity that is found by the dot product of the force and the displacement of the body.
The force applied by the rushing water is given to be exerted is (210N)i-(150N)j
The displacement is given to be (15m)I - (12m)j.
Now, putting all the values,
W = (210i-150j)(15i-12j)
W = 4950 Joules.
So, the work done by the force to move the ice block is 4950 Joules.
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Complete question - A floating ice block is pushed through a displacement vector d= (15 m)i - (12 m)j along a straight embankment by rushing water, which exerts a force vector F = (210 N)i - (150 N)j on the block. How much work does the force do on the block during the displacement?
what does a flat horizontal line on a graph mean?
a. the object is moving fast
b. the object is motionless
c. the object is gaining speed
d. the object is moving back to its original position
Gravity is the centripetal force that holds the Earth in orbit around the Sun. Where does this centripetal force vector
point?
a. Toward the center of the Sun
b. Toward the center of the Earth
c. In the direction of the Earth’s orbit
d. In a straight line away from the Sun
Explanation:
b. Toward the center of the Earth
when using the transit method, why is it easier to detect gas giants (like jovian planets) than earth-sized planets?
When planets have relatively close orbits and when at least one of them is more massive, causing the orbital period of a less large planet to be more perturbed, it is simpler to spot transit-timing fluctuations.
What is the transit method best for?The most reliable and sensitive method for finding extrasolar planets right now is transit photometry. For room observatories that can look unceasingly at stars for weeks or months, it is a very useful technique.
What does the astronomical transit method involve?The bulk of exoplanets that are currently known were discovered via the transit method. Transiting refers to the movement of the earth past a star and an observer. Transits within our cosmos can be witnessed from Earth when Mercury or Venus pass in front of the Earth and the Sun.
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A force of 57.1 Newtons is applied for 0.977 meters; what work was done on the object?(1 point)
Responses
58.1 J
58.1 J
56.1 J
56.1 J
55.8 J
55.8 J
58.4 J
If A force of 57.1 N is applied for 0.977 meters then work is done on the object is 55.8J .
What is displacement?Displacement is defined as the shortest distance travelled by the object.
Displacement is defined to be the change in position of an object.
it has both magnitude and direction. it is a vector quantity.
What is force?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. The application of force is the location at which force is applied, and the direction in which the force is applied is known as the direction of the force.
A spring balance can be used to calculate the Force. Newton is the SI unit of force (N).
mathematically, F=ma
where, F = force
m = mass and a = acceleration
Given,
force Applied is 57.1N .
displacement is 0.977 m.
According to the formula of work done,
work = force × displacement
Work = 57.1N×0.977m
Work = 55.78J
work = 55.8J
Hence, if A force of 57.1 N is applied for 0.977 meters then work is done on the object is 55.8J .
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Answer:
55.8 J
Explanation:
Basic Electrical Quantities: Solve the following problems .
A lightning strike carries 5.0 C of charge in the 0.02 s it takes to reach the ground. What is the electric current carried by the lightning strike . please I need a answer fast
The electric current carried by the lightning strike, given it carries 5.0 coulomb in 0.02 second is 250 A. Details below
How to determine the electric currentWe'll begin by writing out the equation relating quantity of electricity, electric current and time. The equation is illustrated below:
Q = It
Where
Q is the quantity of electricity in coulomb (C)I is the electric current in ampere (A)t is the time in second (s)With the above formula, we can obtain the electric current. Details below
From the question given above, the following data were obtained:
Quantity of electricity (Q) = 5.0 CTime (t) = 0.02 sElectric current (I) =?Q = It
5 = I × 0.02
Divide both sides by 0.02
I = 5 / 0.02
I = 250 A
Thus, from the calculation made above, we can draw our conclusion that the electric current carried by the lightning strike is 250 A
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two balls of masses m1 and m2 are moving along a line on frictionless surface with velocities v1 and v2. mass m1 collides elastically with m2. what is the center of mass velocity v cm of this system of two balls after collision?
The center of mass velocity [tex]v_{CM}[/tex] of this system of two balls of masses m1 and m2 with velocities v1 and v2 after collision is ( m1 v1 + m2 v2 ) / ( m1 + m2 )
p = m v
p = Momentum
m = Mass
v = Velocity
For ball 1,
m = m1
v = v1
p1 = m1 v1
For ball 2,
m = m2
v = v2
p2 = m2 v2
Center of mass velocity, [tex]v_{CM}[/tex] = Total momentum / Total mass
Total momentum = p1 + p2
Total mass = m1 + m2
[tex]v_{CM}[/tex] = ( p1 + p2 ) / ( m1 + m2 )
[tex]v_{CM}[/tex] = ( m1 v1 + m2 v2 ) / ( m1 + m2 )
Therefore, the center of mass velocity [tex]v_{CM}[/tex] of this system of two balls is
[tex]v_{CM}[/tex] = ( m1 v1 + m2 v2 ) / ( m1 + m2 )
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In which phase change are hydrogen bonds formed?
sublimation
freezing
boiling
evaporation
The phase change in which hydrogen bonds are formed is freezing. That is option B.
What is phase change?Phase change is defined as the process that matter passes through in which there is change in state of matter from one form to another.
The different phase changes of matter include the following:
Melting.Freezing.Evaporation. Condensation.Freezing is defined as the phase change through which a liquid medium changes to a solid medium leading to the formation of ice.
Ice contains more hydrogen bonds than water. That is to say that freezing is the phase change in which hydrogen bonds are formed most.
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Answer:
1. condensation
2. heat of vaporization
3. freezing
4. 68.8J
Explanation:
States of Matter Quick Check
An object is projected from the ground at an angle of 30o above the horizontal and returns to the ground 8 seconds later. What is the object’s maximum height?
The object's maximum height during projectile motion is 78.4 m.
We need to know about the projectile motion to solve this problem. The projectile motion is known as parabolic motion and the velocity is divided by 2 axes.
vox = vo cosA
voy = vo sinA
where vox is initial velocity of x axis, voy is initial velocity of y axis, vo is initial velocity and A is the angle.
The total time taken during projectile motion is
t = 2(voy)/g
where t is total time and g is the gravitational acceleration (9.8 m/s²)
The maximum height also can be found using this formula
ymax = voy² / 2g
where ymax is the maximum height
From the question above, the given parameters are
A = 30⁰
t = 8 s
Find the initial velocity of y axis
t = 2(voy)/g
8 = 2 . voy / 9.8
voy = 39.2 m/s
Find the maximum object's height
ymax = voy² / 2g
ymax = 39.2² / 2 . 9.8
ymax = 78.4 m
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an airplane flying at an altitude of 120 m is dropping a package to some stranded hikers. ifthe aircraft is moving at 95 m/s, how far from the hikers should the package be dropped sothat it lands at their location?
The package should be dropped at a horizontal distance of 465.4 Meters away from the hikers.
The package dropped from the aircraft will have a path of a projectile.
The speed of the aircraft is 95m/s.
The aircraft is 20 m above the hikers.
The initial velocity of the package will also be 95m/s.
The horizontal range of the projectile is given by,
R = u√(2h/g)
Where you is the initial velocity,
u is the height,
g is acceleration due to gravity.
Now, putting all the values,
R = 95(√(2(120)/10))
R = 465.4 m.
Show the aircraft should drop the package at a distance of 465.4 m away from the hikers.
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