Answer:
The simplest way to put it is that friction is a force in which there is a resistance between material elements when they slide against each other. There is no completely accurate answer as to why friction occurs, but scientists believe that it is because of tiny bumps on the surface of a material.
difference between objects at rest and objects at motion
Object at rest :
*An object is said to be at rest if it does not change its position with respect to its surroundings with time.
Object at motion:
*An object is said to be in motion if the position changes with respect to it surrounding and time.
Answer:
Objects at rest: Objects at rest are ones that have no motion in them and will be stable in the same position. They have potential energy.
Objects at motion: Objects at motion are ones that are constantly in motion and a consistent velocity until they are acted upon by an unbalanced force. They have kinetic energy.
Explanation:
Sophie runs around an oval 5 mile track. What is Sophie's displacement and total distance ran?
Her displacement and distance are each 0.
Her displacement is O and her distance is 5 miles.
Her displacement is 5 miles and her distance is 0.
Her distance and displacement are each 5 miles.
Answer:
Her displacement is 0 miles and her distance is 5 miles.
Explanation:
Given information:
Sophie runs in an oval track. The length of track is 5 m.
Distance is the total length of path covered during motion while displacement is the shortest distance between initial and final position.
In this case, Sophie completes one cycle in the oval track and the track length is 5 m. So, the distance covered by her will be 5 m.
Now, after completing the track, the initial and final position of Sophie will be same and hence, the displacement she covered will be 0 miles.
Therefore, option "Her displacement is 0 mile and her distance is 5 miles" is correct.
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The displacement of Sophie is 0 and her distance is 5 m
The displacement of Sophie is the change in her position.
If she runs in an oval track, she will return to her initial starting position. The initial position and the final position will be equal, the change in her displacement will be zero.
[tex]\Delta x = x_f- x_i\\\\\Delta x = 5 - 5 = 0[/tex]
The distance traveled by Sophie is the sum of the total distance covered.
distance = 5 m
Thus, the displacement of Sophie is 0 and her distance is 5 m
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PLEASE ANSWER!!!!!!!!! WILL GIVE BRAINLIEST!!!
Physical Science is the study of ____.
energy
matter
how matter and energy interact
all answers are true
Physics is the study of matter, energy and the interactions between them. So, all the answers are true.
What is meant by energy ?Energy is defined as the measurement of ability to do work.
Here,
Energy is the measurement of ability do work, which is a physical property of matter. Energy is of various types such as kinetic energy, potential energy, thermal energy, electrical energy, heat energy, etc. Energy and its applications are associated with many laws. The study of energy and the laws associated with them is one of the main branch of physics.
Matter is defined as the substance that has a specific mass and occupies physical space. Atomic particles such as electrons, protons and others are material particles. Thus the study of these matter and material particles is an important branch of physics.
Matter and energy in nature interacts in many ways. Material particles moving moving with particular kinetic energy is an example of matter-energy interactions. These interactions and their studies comes under physics.
Hence,
Physics is the study of matter, energy and the interactions between them. So, all the answers are true.
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mention the cause of wasting
Answer:
Causes. Wasting can be caused by an extremely low energy intake (e.g., caused by famine), nutrient losses due to infection, or a combination of low intake and high loss. Infections and conditions associated with wasting include tuberculosis, chronic diarrhea, AIDS, and superior mesenteric artery syndrome
Q23 In Hindu chronology, the longest time measure is a para. One para equals 311 040 000 000 000 years. Calculate this value in megayears, hours and in seconds. Write your answers in scientific notation.
The conversion in megayears, hours and seconds are :
[tex]1 \: para \: = \: 3.11 \times {10}^{8} \: megayears[/tex]
[tex]1 \: para \: = \: 2.72 \times {10}^{18} \: hours[/tex]
[tex]1 \: para \: = \: 9.81 \times {10}^{21} \: seconds[/tex]
Given that :
1 para = 311040000000000 years
1 mega year = 1 million years :
311040000000000 years expressed in mega years will be :
Let : number of mega years = p
1 mega year = 1,000,000 years
p = 311040000000000 years
Cross multiply :
311040000000000 × 1 = 1,000,000 × p
311040000000000 = 1000000p
p = 311040000000000 / 1000000
p = 311040000 mega years
p = 3.1104 × 10^8 mega years
[tex]1 \: para \: = \: 3.11 \times {10}^{8} \: megayears[/tex]
In hours :
In hours : 8760 hour = 1 year
Let : number of hours = p
1 year = 8760 hours
311040000000000 years = p
Cross multiply :
p = 8760 × 311040000000000
p = 2724710400000000000
p = 2.72 × 10^18 hours
[tex]1 \: para \: = \: 2.72 \times {10}^{18} \: hours[/tex]
In seconds :
31536000 seconds = 1 year
Let : number of hours = p
1 year = 31536000 seconds
311040000000000 years = p
Cross multiply :
p = 31536000 × 311040000000000
p = 9808957440000000000000
p = 9.81 × 10^21 hours
[tex]1 \: para \: = \: 9.81 \times {10}^{21} \: seconds[/tex]
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ball is projected horizontally from a height of 30m above the ground with a speed of 20m/s. calculate the horizontal distance travelled by the ball when it hits the ground g = 10m/s2]
The range is
[tex]\Large\displaystyle\text{$\begin{gathered} \text{Range } = R= v_x\sqrt{\frac{2S_{y_0}}{g}}\\ \\R= 20\sqrt{6} \approx 48.98\text{ m}\\ \\\end{gathered}$}[/tex]
We know that in cinematic problems the velocity in different directions is independent, so on the y-axis, or the y-velocity we have the gravity acceleration changing the velocity, although on the x-axis, or the x-velocity we don't have any acceleration, so the velocity is constant, so, we can use the basic cinematic equations and adapt them for our problem:
[tex]\Large\displaystyle\text{$\begin{gathered}S_x = S_{x_0} + v_x t\\ \\v_y = v_{y_0} - gt \\ \\S_y = S_{y_0} + v_{y_0}t - \frac{gt^2}{2}\end{gathered}$}[/tex]
We can simplify it, we know that all the initial position on the x-axis is zero, but the initial position on the y-axis is 30, we also know that the initial velocity on y-axis is zero, so
[tex]\Large\displaystyle\text{$\begin{gathered}S_x = v_x t\\ \\v_y =- gt \\ \\S_y = S_{y_0} - \frac{gt^2}{2}\end{gathered}$}[/tex]
I won't put numbers know, let's do all the manipulation first.
When the ball hit the ground we know that his position is 0 on the y-axis, so
[tex]\Large\displaystyle\text{$\begin{gathered}0 = S_{y_0} - \frac{gt^2}{2}\\ \\S_{y_0} = \frac{gt^2}{2}\\ \\t = \sqrt{\frac{2S_{y_0}}{g}}\end{gathered}$}[/tex]
Now we know when the ball hits the ground, so we can use this time on the position equation on the x-axis and find out the distance the ball travelled
[tex]\Large\displaystyle\text{$\begin{gathered}S_x = v_x t\\ \\S_x = v_x\sqrt{\frac{2S_{y_0}}{g}}\end{gathered}$}[/tex]
That's all! we can just put the values know.
[tex]\Large\displaystyle\text{$\begin{gathered} \text{Range } = R= v_x\sqrt{\frac{2S_{y_0}}{g}}\\ \\R= 20\sqrt{\frac{2\cdot 30}{10}}\\ \\R= 20\sqrt{6} \approx 48.98\text{ m}\\ \\\end{gathered}$}[/tex]
Hope you liked it
Question? Ask me in the comments
if you had 6,000 milligrams of rock to move how many kilograms is that?
Answer:
0.006
Explanation:
100mg= 0.0001kgghsjsslslkdn d
Liquid water is heated until it boils and becomes water vapor. Which statement is true about the water?
A.
Neither the physical properties nor the chemical properties have changed.
B.
The physical properties have changed, but the chemical properties have not.
C.
Both the physical properties and the chemical properties have changed.
D.
The chemical properties have changed, but the physical properties have not.
Your answer is B. The physical properties have changed, but the chemical properties have not
Hope this helps!
why is newton's gravitational force called universal gravitational force
Answer:
is called so because it is applicable on all bodies having mass, and the bodies will be governed by the same law, that is newton's law of gravitation. Thus, as it is applicable universally, it is called as universal law
After an impact involving a high-speed car, the bumper leaves the front of the car with a speed of 96 m/s. After 5 seconds, how far has the bumper landed?
The motion of the particles is most orderly in
Answer:
Solids
Explanation:
Particles are most orderly in solids.
What is the volume of a storage tank which will hold 3200kg of petrol?
Answer:
The volume of 3200 kg of petrol is 4 m^3.
How is heavy water different from normal water? A hydrogen atom in heavy water has an extra neutron. A hydrogen atom in heavy water has an extra proton. An oxygen atom in heavy water has an extra proton. An oxygen atom in heavy water has an extra neutron.
Answer:
शब्द प्रयोग गर्छौं ।
The difference, though, lies in the hydrogen atoms. In heavy water, each hydrogen atom is indeed heavier, with a neutron as well as a proton in its nucleus. This isotope of hydrogen is called deuterium, and heavy water's more scientific name is deuterium oxide.
(b) On what factor does the mechanical advantage of a simple machine depend? (a) N/m B. Very short answer questions, 1. What is the principle of simple machine? 2. 3. The efficiency of simple machine is 75%. What does it mean? 4. S. What is lever? In how many classes is lever classified? Write the name of a simple machine used to change the direction of force. 6.the velocity ratio of a pulley system is 4.what does it mean? 0 Reliant Science - 9
Answer:
No.b answer
the ratio of the length of the lever arm where the force is applied divided by the length of the lever are that lifts the load.
No.1 answer
if there is no friction in a simple machine, work output and work input are found to be equal in the machine.
No.3 answer
machine that is 75% efficient means that 75% of the work input is obtained as the useful output and the remaining 25% has been lost in overcoming the friction.
No.4 Answer
A lever is a simple machine made of a rigid beam and a fulcrum. In 3 calss lever is classified.
Simple pulleys change the direction of the force used to lift an object over a distance.
ratio of distance travelled by effort to the distance travelled by load in the machine.
Hope this will help you alot
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Complete the ray diagram and label incident ray, refracted ray, angle of incidence, and angle of refraction
Answer:
Solution
verified
Verified by Toppr
(a) The labelled diagram is shown.
(b) The refractive index of diamond is 2.42. Refractive index of diamond is the ratio of the speed of light in air to the speed of light in diamond.i.e.,
μ=
Speedoflightindiamond
Speedoflightinair
and, the ratio of these velocities is 2.42. i.e., This means that the speed of light in diamond will reduce by a factor of 2.42 as compared to its speed in air. In other words, the speed of light in diamond is
1/2.42
times the speed of light in vacuum.
Explanation:
a) Draw and label the diagram given :
(i) Incident ray
(ii) Refracted ray
(iii) Emergent ray
(iv) Angle of reflection
(v) Angle of deviation
(v) Angle of emergence
(b) The refractive index of diamond is 2.42. What is the meaning of this statement in relation to speed of light?
18-8Y=6
Solve for Y
Round to TWO decimal points
Answer:
-8Y =6-18
-8Y=-12
Y=-12+8
y=-4
Weight is thought to be how big or how small and object is. Which of the following is another definition of weight
Answer:
Where is the rest of the question?
A roller coaster’s velocity at the top of a hill is 10 m/s. Two seconds later it reaches the bottom of the hill with a velocity of 26 m/s. What was the acceleration of the coaster? [3]
Answer:
8 m/s²
Explanation:
a = [tex]\frac{v-v0}{t}[/tex]
a = (26 - 10)/2 = 8 m/s²
convert 22000mg to cg
Your answer is.. 22000 mg = 2200 cg
Because:
1 mg = 0.1 cg
I hope this helps!
A sample of oxygen gas occupies a volume of 200 mL at a pressure of 720 torr. What volume will the gas occupy at a pressure of 800 torr if temperature is held constant
We have that the gas will occupy at a pressure of 800 torr if temperature is held constant a Volume of
[tex]V_2=0.18L[/tex]
From the Question we are told that
Initial Pressure [tex]P_1=720[/tex]
final Volume [tex]V_1=200mL[/tex]
Initial Pressure [tex]P_2=800[/tex]
final Volume [tex]V_2=?[/tex]
Generally the equation for Boyle's law is mathematically given as
[tex]P_1V_1= P_2V_2[/tex]
Therefore
[tex]V_2=\frac{ P_1V_1}{P_2}\\\\V_2=\frac{ 720*200}{800}\\\\V_2=180mL[/tex]
[tex]V_2=0.18L[/tex]
The gas will occupy at a pressure of 800 torr if temperature is held constant a Volume of
[tex]V_2=0.18L[/tex]
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4. In order to operate the theremin, a
conducting object must be moved within
the electric fields produced by the
instrument. Would a baton made of wood
make a good choice? Explain.
No, it would not be a good choice.
Theremin is an electronic musical instrument controlled without physical contact by the performer.
The theremin has inside it three radio-frequency oscillators, of which two form the heart of the pitch circuitry and the third drives the volume circuitry. The theremin typically consists of a box with two metal antennas which create an electromagnetic field. The musician stands in front of the instrument and moves his hands in the proximity of the two antennas, which forms a capacitor between his hands and the antennas.The pitch circuit uses a fixed-frequency oscillator operating at 260 kHz and a variable-frequency oscillator having a range of 257-260 kHz.Learn more:
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How many megabytes does a 30-gigabyte hard drive hold
Answer:
30,000
Explanation:
1 gig is 1000 megabytes
Standing at the edge of a cliff 32.5m high, you do a ball. Later, you throw a second ball downward with an initial speed of 11m/s. Calculate the velocity if each of the balls when it hits the ground
Answer: The displacement of the ball
ℎ =
2 −
2
2
So, final speed of the first ball
1 = √2ℎ = √2 × 9.8 × 32.5 = 25.24
m
s
The change of it speed
∆1 = 25.24 − 0 = 25.34
m
s
The final speed of the second ball
2 = √
2 + 2ℎ = 27.53
m
s
The change of the second ball speed
∆2 = 27.53 − 11 = 16.53
m
s
Thus
∆1 > ∆2
Answer: ∆1 > ∆2
Explanation:
The final velocity of the first ball is 25.24 m/s and the final velocity of the second ball is 27.53 m/s
To calculate the final velocity of the first ball, we use the equation
v² = u² - 2gh where u = initial velocity of first ball = 0 m/s, v = final velocity of first ball, g = acceleration due to gravity = -9.8 m/s² (since it is directed downwards)and h = height of cliff = 32.5 m
Substituting the values of the variables into the equation, we have
v² = u² - 2gh
v² = (0 m/s)² - 2 × -9.8 m/s² × 32.5 m
v² = 0 m²/s² + 637 m²/s²
v² = 637 m²/s²
v = √(637 m²/s²)
v = 25.24 m/s
To find the final velocity of the second ball, we also use
v'² = u'² - 2gh where u' = initial velocity of second ball = 11 m/s, v' = final velocity of second ball, g = acceleration due to gravity = -9.8 m/s² (since it is directed downwards)and h = height of cliff = 32.5 m
Substituting the values of the variables into the equation, we have
v'² = u'² - 2gh
v'² = (11 m/s)² - 2 × -9.8 m/s² × 32.5 m
v'² = 121 m²/s² + 637 m²/s²
v'² = 758 m²/s²
v' = √(758 m²/s²)
v' = 27.53 m/s
So, the final velocity of the first ball is 25.24 m/s and the final velocity of the second ball is 27.53 m/s
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motorcycle starting from rest cover 200 metre distance in 6 second calculate final velocity and acceleration of the motorcycle
What is the difference between the temperatures on Earth and the moon?
Answer:
The earth is hotter
Explanation:
the average temperature on earth is 57 degrees Fahrenheit the average on the moon is -298 degrees Fahrenheit
Can you answer this math homework? Please!
Which is the best estimate for the mass of a typical lineman on a high school football team
1. 100,000 g
2. 100,000 kg
3. 100,000 mg
We have that the best estimate for the mass of a typical lineman on a high school football team is
[tex]100,000 g=100kg[/tex]
From the options
1. 100,000 g
2. 100,000 kg
3. 100,000 mg
Generally
A Typical lineman cannot be as small as
[tex]100000mg=0.1kg=100g[/tex]
A Typical linesman cannot be as massive as
[tex]100,000kg[/tex] as that is unrealistic
With the Average Mass of A Typical linesman can be
[tex]100,000 g=100kg[/tex]
In conclusion
The best estimate for the mass of a typical lineman on a high school football team is
[tex]100,000 g=100kg[/tex]
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What two types of measurements make up density
Answer:
Mass and volume
Explanation:
Density is determined by two types of measurements mass and volume. The resulting density value is typically expressed in units such as grams per cubic centimeter (g/cm³) or kilograms per liter (kg/L).
Density is determined by two types of measurements:
Mass: Mass is the amount of matter present in an object. It is typically measured in units such as grams (g) or kilograms (kg).
Volume: Volume is the amount of space occupied by an object. It can be measured in units such as cubic centimeters (cm³) or liters (L).
To calculate density, you divide the mass of an object by its volume. The formula for density is:
Density (ρ) = Mass (m) / Volume (V)
The resulting density value is typically expressed in units such as grams per cubic centimeter (g/cm³) or kilograms per liter (kg/L).
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write the law of friction???
Answer:
The friction of the moving object is proportional and perpendicular to the normal force
The friction of the moving object is proportional and perpendicular to the normal force. The friction experienced by the object is dependent on the nature of the surface it is in contact with. Friction is independent of the area of contact as long as there is an area of contact.
A rock is dropped from a height of 3,245 m. If we ignore air resistance, how fast will it be travelling after it falls for 3.4 s?
Answer:
954.4m/s
Explanation:
For a free falling object,it has constant acceleration and a changing velocity.
By using the velocity-time formula, the velocity can be obtained.
The height the rock travelled is the distance.
From,
Velocity (v) = Distance (d) / Time(t)
v = 3245m/3.4s
v = 954.4m/s
That js the answer I got. Hope it's right.
