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Which of the following statements is correct?
A. Potential energy is the energy of speed and kinetic energy
is the energy stored in an object.
B. Potential energy is the energy of mass and kinetic energy
is the energy of gravity.
C. Kinetic energy is the energy an object as a result of its
motion, and potential energy is the energy of position or
deformation. - ANSWER -C. Kinetic energy is the energy of an
object as a result of its motion, and potential energy is the
energy of position or deformation.
A truck increases its speed. What happens to its
kinetic energy?
A. not enough
information
B. it
decreases
C. it increases - ANSWER -C. it
increases
In which of the following situations is the object's potential
energy changing?
, A. a child sledding down a hill
B. a jug of milk standing on the top shelf in a refrigerator
C. a man biking at 20 miles per hour on a straight road
D. a person rowing a canoe on a lake - ANSWER -A. a child
sledding down a hill
The figure below shows a pendulum. Assume that there are no
frictional losses.
The ball is displaced to point A and released. As the ball
moves, it passes, in
order through points B, C, D, and E, and then again through
points D, C, B, and
so on. Answer the following
questions.
The ball has the greatest potential energy a point ____.
The ball has the greatest kinetic energy at point _____.
The ball has the greatest total mechanical energy at point ____.
- ANSWER -A C
B
Which has a greater thermal energy, coffee at 80°C in a cup or
water at 80°C in
a swimming
pool?