If you shine a flashlight "horizontally" from one wall to an opposite wall inside an accelerating spaceship in deep space, you will see the light traveling
A) in a straight-line path.
B) in a parabolic path.
C) along the arc of a circle.
Answer: B
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A 6.0-kg object moving 2.0 m/s in the positive x direction has a one-dimensional elastic collision with a 4.0-kg object moving 3.0 m/s in the opposite direction. What is the total kinetic energy of the two-mass system after the collision?
A. 30 J B. 62 J C. 20 J D. 44 J E. 24 J
The half-life of 20F is 11 s. What fraction of a sample of 20F will remain after 99 s have elapsed?
a. 1/10 b. 1/9 c. 1/400 d. 1/512 e. None of these
An astronaut outside a spaceship hammers a loose rivet back in place. What happens to the astronaut as he swings the hammer?
a. Nothing. The spaceship takes up the momentum of the hammer. b. He moves away from the spaceship. c. He moves towards the spaceship. d. He moves towards the spaceship as he pulls the hammer back and moves away from it as he swings the hammer forward. e. He moves away from the spaceship as he pulls the hammer back and moves toward it as he swings the hammer forward.
Your bat hits the ball pitched to you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude is
A) somewhat less than 1500 N. B) somewhat greater than 1500 N. C) exactly equal to 1500 N. D) essentially zero.