phys exam practice questions &
answers 2025
Car 1 has 7 times the mass of car 2, but only 0.6 as much kinetic energy. What is the ratio
between the speeds of the
two cars (v1/v2)? You must type your answer as a numerical value. - ANSWERS0.293 ,
root(0.6/7)
In a time t=17.00 s, a 63.0-kg student runs at a steady pace up two flights of stairs whose
combined vertical height is
8.20 m. Compute the student's power output in doing work against gravity - ANSWERS298W
The 2.0 kg block in the figure slides down a frictionless curved ramp, starting from rest at a
height of h = 3.80 m. The block then slides d = 7.80 m on a rough horizontal surface before
coming to rest. What is the coefficient of friction between the block and the horizontal surface?
- ANSWERS0.487
A skier traveling 12.0 m/s reaches the foot of a steady upward 18° incline and glides 17.2 m up
along this slope before
coming to rest. What was the average coefficient of friction? - ANSWERS0.124
A boy pulls a 29.0-kg box with a 140-N force at 37° above a horizontal surface. If the coefficient
of kinetic friction
between the box and the horizontal surface is 0.16 and the box is pulled a distance of 28.0 m,
what is the net work done
on the box? - ANSWERS2.23 x 10 ^3 J
, A 29.00-kg child initially at rest slides down a playground slide from a height of 2.90 m above
the bottom of the slide.If her speed at the bottom is 2.70 m/s, how much energy is lost due to
friction? - ANSWERS718J
7. A roller coaster reaches the top of the steepest hill with a speed of 6.80 km/h. It then
descends the hill, which is at an
average angle of 30° and is 53.0 m long. What will its speed be when it reaches the bottom?
Assume µk
= 0.10 - ANSWERS20.8 m/s
A 0.56-kg ball is thrown vertically upward with an initial speed of 14.5 m/s. What is the kinetic
energy of the ball when
it has travelled one-quarter of the distance to its maximum height? - ANSWERS44.2
The drawing shows a version of the loop-the-loop trick for a small car. The radius of the loop =
0.48 m. What is minimum initial speed ( ) that the car needs to have in order to remain in
contact with the circular track at all times? - ANSWERS4.85 m/s
10. A box of mass 7.60 kg is pulled from rest up a 40.0 m long incline that makes an angle of
19.0 with horizontal. The
coefficient of kinetic friction between the box and the incline is 0.160. At the top of the incline,
the speed of the box is
4.30 m/s. What is the work done by the pulling force? - ANSWERS1.49 x 10^3 J
1. A 2.40-kilogram mud ball drops from rest at a height of 14.0 m. If the impact between the ball
and the ground lasts
0.58 s, what is the magnitude of the average force exerted by the ball on the ground -
ANSWERS68.5 N
answers 2025
Car 1 has 7 times the mass of car 2, but only 0.6 as much kinetic energy. What is the ratio
between the speeds of the
two cars (v1/v2)? You must type your answer as a numerical value. - ANSWERS0.293 ,
root(0.6/7)
In a time t=17.00 s, a 63.0-kg student runs at a steady pace up two flights of stairs whose
combined vertical height is
8.20 m. Compute the student's power output in doing work against gravity - ANSWERS298W
The 2.0 kg block in the figure slides down a frictionless curved ramp, starting from rest at a
height of h = 3.80 m. The block then slides d = 7.80 m on a rough horizontal surface before
coming to rest. What is the coefficient of friction between the block and the horizontal surface?
- ANSWERS0.487
A skier traveling 12.0 m/s reaches the foot of a steady upward 18° incline and glides 17.2 m up
along this slope before
coming to rest. What was the average coefficient of friction? - ANSWERS0.124
A boy pulls a 29.0-kg box with a 140-N force at 37° above a horizontal surface. If the coefficient
of kinetic friction
between the box and the horizontal surface is 0.16 and the box is pulled a distance of 28.0 m,
what is the net work done
on the box? - ANSWERS2.23 x 10 ^3 J
, A 29.00-kg child initially at rest slides down a playground slide from a height of 2.90 m above
the bottom of the slide.If her speed at the bottom is 2.70 m/s, how much energy is lost due to
friction? - ANSWERS718J
7. A roller coaster reaches the top of the steepest hill with a speed of 6.80 km/h. It then
descends the hill, which is at an
average angle of 30° and is 53.0 m long. What will its speed be when it reaches the bottom?
Assume µk
= 0.10 - ANSWERS20.8 m/s
A 0.56-kg ball is thrown vertically upward with an initial speed of 14.5 m/s. What is the kinetic
energy of the ball when
it has travelled one-quarter of the distance to its maximum height? - ANSWERS44.2
The drawing shows a version of the loop-the-loop trick for a small car. The radius of the loop =
0.48 m. What is minimum initial speed ( ) that the car needs to have in order to remain in
contact with the circular track at all times? - ANSWERS4.85 m/s
10. A box of mass 7.60 kg is pulled from rest up a 40.0 m long incline that makes an angle of
19.0 with horizontal. The
coefficient of kinetic friction between the box and the incline is 0.160. At the top of the incline,
the speed of the box is
4.30 m/s. What is the work done by the pulling force? - ANSWERS1.49 x 10^3 J
1. A 2.40-kilogram mud ball drops from rest at a height of 14.0 m. If the impact between the ball
and the ground lasts
0.58 s, what is the magnitude of the average force exerted by the ball on the ground -
ANSWERS68.5 N
