The net work done in accelerating a propeller from rest to an angular velocity of 200 rad/s is 3000 J. What is the rotational inertia of the propeller?
0.15 kg/m2
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A rifle fires a bullet. Immediately after the bullet is fired, which of the following is NOT true?
A. the rifle and the bullet have the same magnitude of momentum B. the force on the rifle due to the bullet and the force on the bullet due to the rifle have the same magnitude C. the impulse on the rifle due to the bullet and the impulse on the bullet due to the rifle have the same magnitude D. the rifle and the bullet do not have the same kinetic energy E. the rifle and the bullet have the same kinetic energy
Mercury's major atmospheric gas is
a. oxygen. b. hydrogen. c. carbon dioxide. d. Misleading; the atmosphere is virtually nonexistent.
The wind speed of the air flowing over a 16-cm-diameter outside mirror is significantly higher than the speed of a vehicle. If the pressure on the front of the mirror is assumed to be stagnation pressure and the pressure on the rear is assumed to be atmospheric, the power needed to move the mirror, if the air velocity around the mirror is 30 m/s, is nearest:
(A) 0.44 hp (B) 0.39 hp (C) 0.34 hp (D) 0.29 hp
Lilies in a certain pond double their total lake area covered every week. The growth of the lilies is
A) Exponential. B) Quadratic. C) Linear. D) Parabolic.