I think fission chain reaction is the correct answer.
Answer: The coefficient of kinetic friction is μ = 0.6
Explanation:
For an object of mass M, the weight is:
W = M*g
where g is the gravitational acceleration: g = 9.8m/s^2
And the friction force between this object and the surface can be written as:
F = W*μ
where μ is the coefficient of friction (kinetic if the object is moving, and static if the object is not moving, usually the static coefficient is larger)
In this case, the weight is:
W = 20N
And the friction force is:
F = 12N
Replacing these values in the equation for the friction force we get:
12N = 20N*μ
(12N/20N) = μ = 0.6
The coefficient of kinetic friction is μ = 0.6
<span>1. The potential energy is 34.3J
2. The kinetic energy is 61,875J.
3. A 0.5 kg ball is at the top of a 20 meter tall hill.
a) What is the ball's kinetic energy ? The ball's kinetic energy is zero.
b) what is the ball's potential energy ? The ball's potential energy is 98.1J.
c) what is the ball's mechanical energy ? The ball's mechanical energy is 98.1J.
4. 2.0 kg toy has been thrown in the air it is 1.5m above the ground and is moving up at 3.0 m/s
a) What is the toy's kinetic energy ? The toy's kinetic energy is 9J.
b) what is the toy's potential energy ? The toy's potential energy is 29.43J.
c) what is the toy's mechanical energy ? The toy's mechanical energy s 38.43J.</span>
Answer:
tmospheric pressure, force per unit area exerted by an atmospheric column (the entire body of air above the specified area)
