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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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.
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
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.