6.) Consider a block sliding down a frictionless inclined plane with acceleration a. If we double the mass of the block, what is its acceleration?
a/4
a/2
a
2a
7.) A person pushes a 10 kg box at a constant velocity over a distance of 4 m. The coefficient of kinetic friction between the box and the floor is 0.3. How much work does the person do in pushing the box?
40 J
75 J
120 J
400 J
8.) When a car's speed doubles, what happens to its kinetic energy?
It is quartered
It is halved
It is doubled
It is quadrupled
9.) A worker does 500 J of work on a 10 kg box. If the box transfers 375 J of heat to the floor through the friction between the box and the floor, what is the velocity of the box after work has been done on it?
5 m/s
10 m/s
12.5 m/s
100 m/s
10.) What is the formula for Power?
W*t
W/t
t/W
2W /3t
a/4
a/2
a
2a
7.) A person pushes a 10 kg box at a constant velocity over a distance of 4 m. The coefficient of kinetic friction between the box and the floor is 0.3. How much work does the person do in pushing the box?
40 J
75 J
120 J
400 J
8.) When a car's speed doubles, what happens to its kinetic energy?
It is quartered
It is halved
It is doubled
It is quadrupled
9.) A worker does 500 J of work on a 10 kg box. If the box transfers 375 J of heat to the floor through the friction between the box and the floor, what is the velocity of the box after work has been done on it?
5 m/s
10 m/s
12.5 m/s
100 m/s
10.) What is the formula for Power?
W*t
W/t
t/W
2W /3t