The Earth never passed through the cratering stage in planetary development
Indicate whether the statement is true or false
F
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Chris and Jamie are carrying Wayne on a horizontal stretcher. The uniform stretcher is 2.00 m long and weighs 100 N. Wayne weighs 800 N. Wayne's center of gravity is 75.0 cm from Chris. Chris and Jamie are at the ends of the stretcher. The force that Jamie is exerting to support the stretcher, with Wayne on it, is
A. 250 N. B. 300 N. C. 350 N. D. 400 N. E. 550 N.
Most of the visible light from the sun originates in the photosphere
Indicate whether the statement is true or false
A spaceship visits Alpha Centauri and returns to Earth. Alpha Centauri is 4.5 light-years from Earth (our second closest star). The spaceship travels at one-half the speed of light for essentially all of its expedition
(a) How long was the ship gone according to an observer on the Earth? (b) How long was the ship gone according to an observer on the spaceship?
A small car and a large truck collide head-on. During the collision, the small car experiences
A) A much larger acceleration than the truck. B) A much larger force than the truck. C) A much larger change in momentum than the truck. D) All of the above. E) None of the above.