The things that determine the amount of an object's gravitational potential energy are ...
-- mass of the object
-- gravitational acceleration in the place where the object is
-- height of the object above the ground or the floor
A). <em>a slice of bread; </em> No. It's still a slice of bread even if it's on the ground.
B. <em>A compressed spring; </em> No. It's still a compressed spring even if it's on the ground.
C. <em>An apple on a tree</em>; <em>Yes !</em> It can't be an apple on a tree if it's on the ground.
D. <em>A stretched bow string</em>; <em>No.</em> It's still a stretched bowstring even if it's on the ground.
Answer:
20 N
Explanation:
There are two forces acting on the box:
- The force of push, F, forward, of magnitude F = 20 N
- The force of friction, 
, backward
So, the equation of motion for the box is
where
m = 5.0 kg is the mass of the box
a is its acceleration
The box is sliding at constant velocity: this means that its acceleration is zero
a = 0
So, the equation becomes
Therefore, we can find the magnitude of the force of friction:
Answer:
Velocity
Explanation:
Velocity is a speed with a direction.
The density of field lines on a source charge indicates the strength of the charge there is. The field lines all represent the movements of field charges. Naturally, if there are a large number of them compressed in an area, then that would mean the charge at that certain point is strong
