A horizontal 52-N force is needed to slide a 50kg box across a flat surface at a constant velocity of 3.5 m/s. What is the coefficient of kinetic friction between the box and the floor?
A) 0.11 B) 0.13 C) 0.10 D) 0.09
A
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A uniform 135-g meter stick rotates about an axis perpendicular to the stick passing through its center with an angular speed of 3.50 rad/s. What is the magnitude of the angular momentum of the stick?
A) 0.0739 kg ? m2/s B) 0.0394 kg ? m2/s C) 0.158 kg ? m2/s D) 0.0236 kg ? m2/s E) 0.473 kg ? m2/s
A rock is projected upward from the surface of the Moon, at time t = 0 s, with an upward velocity of 30.0 m/s. The acceleration due to gravity at the surface of the Moon is 1.62 m/s2, and the Moon has no atmosphere
The height of the rock when it is descending with a speed of 20.0 m/s is closest to A) 115 m. B) 125 m. C) 135 m. D) 145 m. E) 154 m.
A box is dropped onto a conveyor belt moving at 2 m/s. If the coefficient of friction between the box and the belt is 0.3, how long before the box moves without slipping?
While a ship moves toward the right at constant velocity, a seaman atop the mast drops a stone which freely falls to position
1) A. 2) B. 3) C. This is better understood by realizing that 4) the ship moved to the right a distance equal to that between A and B while the stone fell vertically. 5) the stone was moving to the right just as fast as the ship during the fall. 6) the net force acting on the stone is equal to its weight. 7) because of inertia, the stone experiences a horizontal motion unlike that of the ship. 8) the stone underwent an acceleration while the ship did not.