The rapid fluctuations of quasars show that the energy emitting portions of these objects must be very small
a. True
b. False
Indicate whether the statement is true or false
True
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A one pound (lbm) square of butter, 2.5 in by 2.5 in by 5 in at 50ºF is placed in a freezer at 28ºF as shown in the figure. If h is 10 Btu/hr?ft^2? ºF, the thermal conductivity is 0.114 Btu/hr?ft?ºF, specific heat is 0.52 Btu/lbm?ºF, and density is 56 lbm/ft^3, determine the time for the center to reach 35ºF.
A ball is thrown straight upward. While it is moving upward, the ball's acceleration is
A) zero, i.e., the ball is not accelerating. B) in the horizontal direction. C) in the upward direction. D) in the downward direction. E) None of the above.
A ball is thrown vertically upwards at 9.8 m/s. For its complete trip (up and back down to the starting position), its average velocity is:
a. 19.6 m/s. c. 4.90 m/s. b. 9.80 m/s. d. not given.
The motion of a piston in an automobile engine is nearly simple harmonic. If the 1-kg piston travels back and forth over a distance of 12.0 cm, what is its maximum speed when the engine is running at 3000 rpm?
a. 4.71 m/s c. 44.0m/s b. 9.42 m/s d. 22.0 m/s