A speedy tortoise can run with a velocity of 10.0 cm/s and a hare can run 20.0 times as fast. In a race, they both start at the same time, but the hare stops to rest for 2.00 minutes. The tortoise wins by a shell (20.0 cm). What was the length of the race?
12.6 m
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The drift speed of electrons that compose current in a flashlight is about
A) the speed of sound waves in metal. B) the speed of light. C) 1000 cm/s. D) less than 1 cm/s. E) any of the above under different conditions.
You carry a 7.0-kg bag of groceries above the ground at constant speed across a room. How much work do you do on the bag in the process?
A) 0.00 J B) 82 J C) 185 J D) 157 J
Matthew pulls his little sister Sarah along the horizontal ground in a wagon. He exerts a force on the wagon of 60.0 N at an angle of 37.0° above the horizontal. If he pulls her a distance of 12.0 m, how much work does Matthew do?
A) 185 J B) 433 J C) 575 J D) 720 J
Lydia proposes to send an interstellar probe off in stages. The first stage, traveling radially outward at 0.500 c relative to Earth, will send off a second stage traveling in the same direction as the first stage at a speed of 0.500 c relative to the first stage. Finally, the second stage will send off a third stage traveling in the same direction at 0.500 c relative to the second stage
Relative to Earth, the speed of the third stage will have a magnitude of a. 0.500 c. b. 0.800 c. c. 0.929 c. d. 0.972 c. e. 1.500 c.