The angular acceleration of a wheel is given in rad/s2by 45t3 – 11t4, where t is in seconds. If the wheel starts from rest at t = 0.00 s, when is the next time the wheel is at rest?
A) 5.1 s
B) 8.4 s
C) 6.9 s
D) 3.6 s
A
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A man of weight Wman is standing on the second floor and is pulling on a rope to lift a box of weight Wbox from the floor below. The rope, which is of negligible weight, has tension T in it, but the pull of the rope is insufficient to lift the box off the floor. What is the magnitude of the normal force that the second floor exerts on the man in this situation?
a. Wman b. Wman + T c. Wman + T + a nonzero portion of Wbox d. Wman + T + Wbox
How is a technical civilization defined?
A) a civilization that can avoid self-destruction for long periods B) a civilization that can communicate over interstellar distances C) a civilization that has the ability to store and process information D) a civilization that has developed interplanetary space travel E) a civilization that can construct tools out of raw materials
An object of mass 0.50 kg is transported to the surface of Planet X where the object's weight is measured to be 20 N. The radius of the planet is 4.0 × 10^6 m. What free-fall acceleration will the 0.50-kg object experience when transported to a distance of 8.00 × 10^6 m from the surface of this planet?
a. 240 m/s2 b. 1.11 m/s2 c. 10.0 m/s2 d. 4.44 m/s2
When two bodies of different masses collide, the impulses they exert on each other are
a. equal for all collisions. b. equal but opposite for all collisions. c. equal but opposite only for elastic collisions. d. equal but opposite only for inelastic collisions. e. equal but opposite only when the bodies have equal but opposite accelerations.