In units of measurement, power in watts is equal to
A) amperes x ohms.
B) amperes x volts.
C) amperes/second.
D) volts/second.
E) none of the above
Answer: B
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_____ is an example of a Jovian planet
A) Uranus B) Earth C) Mercury D) Mars
Energy and Momentum: A block of mass m = 9.0 kg and speed V and is behind a block of mass M = 27 kg and speed of 0.50 m/s, as shown int the figure. The surface is frictionless, and the blocks suddenly collide and couple. After the collision, the blocks have a common speed of 0.90 m/s. How much kinetic energy of the blocks is lost due to the collision?
A. 8.6 J B. 2.0 J C. 4.6 J D. 11 J E. 31 J
A light beam from a 2.1-mW He-Ne laser has a wavelength of 633 nm. How many photons does the laser emit in one second? (h = 6.626 × 10-34 J • s, c = 3.00 × 108 m/s)
A) 6.7 × 1015 B) 8.8 × 1015 C) 1.1 × 1016 D) 1.3 × 1016
A block of wood and a block of copper will feel neither hot nor cold to your touch when they each have
A) equal temperatures. B) your temperature. C) equal conductivities. D) none of the above