Which of the following is NOT true of physical properties A:Substances change form or shape B:Substances remain the same C:Chemi
1 answer:
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Answer:
Explanation:
Potential Energy= Kinetic Energy
Let be the value of Kinetic Energy.
We know that
Make the subject of the formula to get speed at the bottom of the hill.
Answer:
Explanation:
Given
mass of ice
Height of hill
Neglecting air resistance
As resistance is absent so Energy at top of hill and at the bottom hill is conserved.
Energy at top is equal to Potential Energy
Energy at bottom is equal to kinetic energy at bottom
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: