A 55-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.30. A horizontal 140-N force is applied to the box. What is the friction force on the box?
A) 140 N B) 42 N C) 16.5 N D) 160 N E) 0.00 N
A
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When we see x-rays from an accretion disk in a binary system, we can't immediately tell whether the accretion disk surrounds a neutron star or a black hole. Suppose we then observe each of the following phenomena in this system. Which one would rule out the possibility of a black hole?
A) intense x-ray bursts B) spectral lines from the companion star that alternately shift to shorter and longer wavelengths C) visible and ultraviolet light from the companion star D) bright x-ray emission that varies on a time scale of a few hours
A 4.00 kg mass is moving in a circular path of radius 2.50 m with a constant angular velocity of 5.00 rad/sec. The centripetal force on the mass is
A. 250 N. B. 185 N. C. 153 N. D. 107 N. E. 94.0 N.
Simple harmonic motion
A. occurs when there are no forces on the system B. requires a constant force C. requires a force which is not constant, but varies directly with position D. requires a force which is not constant, but varies inversely with position
The energy released from a nuclear reaction is equal to:
a. energy associated with momentum conservation. b. the exothermic endothermy. c. energy associated with the change in mass. d. the total charge involved.