The rate of expansion of the Universe is currently increasing
a. True
b. False
Indicate whether the statement is true or false
True
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Suppose you are in a spaceship accelerating away from Earth at 9.8 m/ s2 (1 g), so that you can walk on the floor of your spaceship as though experiencing normal gravity on Earth
Is it possible for you to consider yourself to be at rest? Why or why not? A) No, because you feel a force so you must truly be accelerating. B) No, because you are accelerating away from Earth, and it's not legitimate to claim that Earth is accelerating away from you. C) Yes, by assuming you are feeling effects of gravity and that Earth is accelerating away from you because it is in freefall. D) Yes, but only if believe that you are the center of the universe.
A 22.3-g bullet moving at 1 000 m/s is fired through a one-kg block of wood emerging at a speed of 100 m/s. What is the change in the kinetic energy of the bullet-block system as a result of the collision assuming the block is free to move?
a. 0 J b. 10.8 kJ c. –10.8 kJ d. 11.2 J e. 223 J
Consider a conducting bar that is free to slide along conducting rails in an upward magnetic field as shown in the diagram below. If we connect the rails to the battery shown, which way will the bar be pushed?
A.A
B.B
C.C
D.D
E. Down into the rails
F. Up off the rails
A common 5-L metal can will float in air if it is
A) evacuated of air. B) filled with a very large amount of helium. C) thrown high enough into the air. D) Nonsense! Unless the can and displaced air weigh the same, the can can't float in air.