A skydiver jumps out of a hovering helicopter. A few seconds later, another skydiver jumps out, so they both fall along the same vertical line relative to the helicopter. Both skydivers fall with the same acceleration. (Assume g is constant.) The vertical distance between them
1.increases.
2.decreases.
3.stays the same.
1
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An auto accelerates forward from 7.0 m/s at a uniform 0.71 m/s2. It travels a distance of 1.033 km while accelerating
(a) How fast is the auto moving just as it is traveled the 1.033 km? (b) How many seconds did it take to travel the 1.033 km?
Using a lever to move a rock reduces the force a person must exert. What does it do to the work the person must do?
a. it reduces the work also b. the work stays the same c. the work increases d. none of the above
A magician can make a candle look as if it is burning under water by focusing light from a candle flame burning in air directly on top of an underwater candle. To do this you want to use a (Hint: eliminate those that cannot work.)
a. concave mirror farther than one focal length from the burning candle. b. a convex mirror farther than one focal length from the burning candle. c. a biconcave lens farther than one focal length from the burning candle. d. a concave mirror closer than one focal length to the burning candle. e. a convex lens closer than one focal length to the burning candle.
An astronaut in a rocket with a speed v-0.6c relative to Earth performs a collision experiment and concludes that both momentum and energy are conserved. What would an Earth observer conclude?
A. Neither energy nor momentum is conserved. B. The collision never happened because the two objects are never in the same place at the same time. C. Energy is conserved, but momentum is not. D. Momentum is conserved, but energy is not. E. Both momentum and energy are conserved.