When the sum of the external forces and the sum of the external torques on a body are both zero, we can conclude that
a. the body is moving at constant velocity but is not rotating.
b. the body is rotating at constant angular velocity but has no linear velocity.
c. the body has neither linear nor angular velocity.
d. the body may have constant linear or angular velocity, but not both simultaneously.
e. the body may have constant linear or constant angular velocity, or both simultaneously.
e
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A one-way mirror works because of
a. interference. b. diffraction. c. its surfaces being half-silvered. d. dispersion. e. polarization.
Suppose an object whose mass is m is moving with a speed of 0.8c. Which is the correct expression for its kinetic energy?
a. K = mv2/2 b. K = ?mc2 c. K = (? ? 1)mc2 d. Answers a and c are both correct.
A certain automobile engine takes in 4.00 kJ of energy and performs 1.10 kJ of mechanical work in each cycle. (a) Calculate the engine's efficiency. (b) How much thermal energy is "wasted" in each cycle?
What will be an ideal response?
An oxygen molecule has a moment of inertia of 5 × 10^?46 kg ? m2 . Calculate the bond length (in nm). Recall that the atomic mass of oxygen is 16 u (1 u = 1.66 × 10^?27 kg)
a. 0.3 b. 0.1 c. 0.2 d. 0.4 e. 0.5