A 330-g air track cart on a horizontal air track is attached to a string that goes over a pulley with a moment of inertia of 5.00 x 10-6 kg?m2 and a radius of 1.35 cm. A 255-g mass hangs from the other end of the string and is released
What is the acceleration of the cart? A) 9.72 m/s2
B) 7.14 m/s2
C) 6.53 m/s2
D) 4.74 m/s2
E) 4.08 m/s2
E
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Consider three galaxies, Alpha, Beta and Gamma. An astronomer in Beta sees each of the other two galaxies moving away from him in opposite directions at 0.70c. At what speed would an observer in Alpha see the galaxy Gamma moving?
A) 1.4c B) 0.94c C) 0.98c D) 0.82c E) 0.70c
Why can't an object return to a point in spacetime that it previously occupied?
A) It would require going back in time. B) It would require going faster than the speed of light. C) It would require deviating from the straightest possible path. D) It could be possible, but only if the universe has a spherical geometry.
How many constitutional isomers that are dibromocyclopropanes exist?
a. 3 b. 8 c. 4 d. 2 e. 5
How much energy would be released if 2.0 kg of material was lost during a reaction? (c = 3.0 × 108 m/s)
A) 4.7 × 10-8 J B) 1.5 × 1016 J C) 6.0 × 108 J D) 1.8 × 1017 J