PHYS 2001: PLV Final Exam Questions With
All Correct & Verified Answers
1. What is the work done by the force of gravity
-60 J
when a 20.0-kg weight is displaced vertically
upward a dis- tance of 3.0 m?
2. A stone sphere of radius 7.00 m rests in a flat field. Rel- 1.23 × 104 J
ative to the ground, what is the gravitational
potential energy of a 90.0-kg person sitting
on the very top of the sphere?
3. A skateboarder wants to cross a large playground and the square
notices that there are large shapes painted on
its as- phalt surface. One shape is a large
circle that cov- ers the entire playground.
Inscribed in that circle is a square, with one
point at the skateboarder's feet and
the other at his destination. The surface is
rough and, therefore, friction is present. What
path does he follow in order to minimize the
work done by nonconserva- tive forces?
a. the circle
b. the path doesnt matter
c. the square
4. A ball is dropped vertically from a height h. Both conservative and
When it rebounds from the floor it attains a nonconservative forces
maximum height of 2/3 h. What statement is act on the ball.
true?
a. Only nonconservative forces act on the ball.
b. Only conservative forces act on the ball.
c.Both conservative and nonconservative forces
act on the ball.
, PHYS 2001: PLV Final Exam Questions With
All Correct & Verified Answers
5. 14 m/s
, PHYS 2001: PLV Final Exam Questions With
All Correct & Verified Answers
A stone is dropped from rest from the top of a
cliff into a pond below. If its initial height is
10 m, what is its speed when it hits the
water?
6. A ball hangs on the end of a string that is connected to Only if
energy is somehow
the ceiling so that it swings like a pendulum. by
You pull the ball up so that it nearly touches nonconser-
the end of your nose. You let the ball swing vative
down (from rest), and then swing back, toward forces in
your face. Under which conditions will the ball stopping the
strike your nose? car?
a. When gravity and air friction act on the
ball.
b. When only gravity acts on the ball.
c. Only if energy is somehow added to the ball.
7. A ball starts with an initial kinetic energy of
1000 J and zero gravitational energy potential.
At some later time, the ball has zero kinetic
energy and 1150 J of gravitational potential
energy. Which of the following is true?
a. A nonconservative force does positive work
on the ball.
b. A nonconservative force does negative work
on the ball.
c. There are no nonconservative forces acting
on the ball.
8. A 2 000-kg car travelling at 25.0 m/s skids to
halt on level ground. How much work was done
, PHYS 2001: PLV Final Exam Questions With
All Correct & Verified Answers
dded to the ball.
nonconservative force does positive work on the ball -6.25 × 105 J
9. How much energy is dissipated by a 60-W light bulb in 3600 J
one minute?
All Correct & Verified Answers
1. What is the work done by the force of gravity
-60 J
when a 20.0-kg weight is displaced vertically
upward a dis- tance of 3.0 m?
2. A stone sphere of radius 7.00 m rests in a flat field. Rel- 1.23 × 104 J
ative to the ground, what is the gravitational
potential energy of a 90.0-kg person sitting
on the very top of the sphere?
3. A skateboarder wants to cross a large playground and the square
notices that there are large shapes painted on
its as- phalt surface. One shape is a large
circle that cov- ers the entire playground.
Inscribed in that circle is a square, with one
point at the skateboarder's feet and
the other at his destination. The surface is
rough and, therefore, friction is present. What
path does he follow in order to minimize the
work done by nonconserva- tive forces?
a. the circle
b. the path doesnt matter
c. the square
4. A ball is dropped vertically from a height h. Both conservative and
When it rebounds from the floor it attains a nonconservative forces
maximum height of 2/3 h. What statement is act on the ball.
true?
a. Only nonconservative forces act on the ball.
b. Only conservative forces act on the ball.
c.Both conservative and nonconservative forces
act on the ball.
, PHYS 2001: PLV Final Exam Questions With
All Correct & Verified Answers
5. 14 m/s
, PHYS 2001: PLV Final Exam Questions With
All Correct & Verified Answers
A stone is dropped from rest from the top of a
cliff into a pond below. If its initial height is
10 m, what is its speed when it hits the
water?
6. A ball hangs on the end of a string that is connected to Only if
energy is somehow
the ceiling so that it swings like a pendulum. by
You pull the ball up so that it nearly touches nonconser-
the end of your nose. You let the ball swing vative
down (from rest), and then swing back, toward forces in
your face. Under which conditions will the ball stopping the
strike your nose? car?
a. When gravity and air friction act on the
ball.
b. When only gravity acts on the ball.
c. Only if energy is somehow added to the ball.
7. A ball starts with an initial kinetic energy of
1000 J and zero gravitational energy potential.
At some later time, the ball has zero kinetic
energy and 1150 J of gravitational potential
energy. Which of the following is true?
a. A nonconservative force does positive work
on the ball.
b. A nonconservative force does negative work
on the ball.
c. There are no nonconservative forces acting
on the ball.
8. A 2 000-kg car travelling at 25.0 m/s skids to
halt on level ground. How much work was done
, PHYS 2001: PLV Final Exam Questions With
All Correct & Verified Answers
dded to the ball.
nonconservative force does positive work on the ball -6.25 × 105 J
9. How much energy is dissipated by a 60-W light bulb in 3600 J
one minute?
