The coefficient of friction is 0.5.
<h3>What is Coefficient of friction?</h3>
The ratio of friction force to normal force is known as the coefficient of friction (COF), which has no dimensions. Those materials are said to as lubricous if their COF is less than 0.1. Surface roughness and COF are dependent on the composition of the materials.
Initial velocity, u=30m/s
time taken = 6s
Final velocity, v=0
Acceleration of friction, a=μg=10μms⁻²
Apply first kinematic equation of motion,
v - u = at
0 - 30 = (-10μms⁻²) × 6
-30 = -60μ
μ = 1/2
μ = 0..5
Hence, coefficient of friction is 0.5
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Answer:7086 J
Explanation:
Given
height of hill from ground(h)=12 m
combined mass of sled and man(m)=60 kg
initial velocity(u)=1 m/s
at bottom velocity(v)=10 m/s
Total mechanical energy of the person
E=Potential Energy+Kinetic Energy
E=7056+30=7086 J
Answer:
First, the meters is the unit used in almost all the world today.
Then using meters as your unit will be easier to read and interpret for a larger number of people than if you use an older system, like hands or steps.
And because of the fact that almost all the world uses the meter as the unit for length, almost all the equations and formulas are written in meters.
Precision: The meter is exactly defined as:
"The length of the path traveled by light in a vacuum in 1/299,792,458 of a second"
So the meter is an exact (and accepted) unit.
Then using this unit for measures of length also provides some "
legitimacy" for you measure.
Yes the text in the red is correct.
The kinetic molecular theory of matter states that: ... Molecules in the solid phase have the least amount of energy, while gas particles have the greatest amount of energy. The temperature of a substance is a measure of the average kinetic energy of the particles.
