If it takes total work W to give an object a speed v and kinetic energy K, starting from rest, what will be the object’s speed (in terms of v) and kinetic energy (in terms of K) if we do twice as much work on it, again starting from rest?
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If it takes total work W to give an object a speed v and kinetic
energy
K, starting from rest, what will be the object’s speed (in terms of v)
and kinetic energy (in terms of K) if we do twice as much work on it,
again starting from rest?
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- Because of friction, a constant force of 20 N is needed to slide a box across a room to the right at a constant speed: a) How many Newtons must the friction force be? b) How much work is done by the friction force? c) How much work is done by gravity? d) How much work is done by the normal (upward) force? e) What is the net work done?Hi, my problem is this: The diagram shows a crate with mass m=36.3kgm=36.3kg being pushed up an incline that makes an angle ϕ=20.7∘ϕ=20.7∘ with the horizontal. The pushing force is horizontal, with magnitude P, and the coefficient of kinetic friction between the crate and the incline is μ=0.31μ=0.31. Consider the work done on the crate as it moves a distance d=5.28md=5.28m at constant speed. How do I find the work done by gravity? And the net work done by the pushing force, friction, and gravity?A 4-kg brick is on table 1 m above the floor. The ceiling is 4 m above the floor. Find the potential energy of the brick if its height is measured relative to (a) the floor; (b) the table; (c) the ceiling
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