Answer:
-223.64684 J
Explanation:
F = Force that is applied to the crate = 68 N
s = Displacement of the crate = 3.5 m
= Angle between the force and displacement vector = (180-20)
Work done is given by

The work that Paige does on the crate is -223.64684 J
Intrusive rocks are formed beneath the earth's surface and extrusive igneous rocks are formed beneath the earth's surface but cool quicken than intrusive igneous rocks<span />
Answer:

Explanation:
Coefficients of Friction
Objects in physical contact produce friction which usually manifests as thermal energy being dissipated in the surface where the objects are interacting. It's usually harder to start to move an object from rest, that keeps moving it at a constant speed on the same surface. That is why there are two different coefficients of friction: the static and the dynamic. As mentioned, the static coefficient
is greater than the dynamic coefficient
. The car is already moving and is attempting to stop. The coefficient of friction is defined as

Where Fr is the force of friction and N is the normal or the force the road pushes back up on the car. With the given data, we have


The coefficient of friction is dimensionless (doesn't have any units)