In a rollercoaster, provided losses of thermal energy because of friction can be neglected because:
a. the mechanical energy increases as the car moves to the top of the slope.
b. the mechanical energy decreases as the car moves to the top of the slope.
c. the gravitational potential energy decreases as the car moves to the top of the slope.
d. the kinetic energy decreases as the car moves to the top of the slope.
e. the rollercoaster moves at constant speed as its height above the ground increases.
Question 2
How high will the pendulum bob swing in this figure?
a. To the height of the pencil's point.
b. To the maximum height of the bob without the pencil, as shown by the left-most position in the figure.
c. Roughly half the height described in choice b.
d. Midway between a. and b.
e. To the height of the pencil eraser.
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Physics: Power, Energy and Time
Physics: Power, Energy and Time