An object of mass m is attached to string of length L. When it is released from point A, the object oscillates between points A and B. Which statement about the system consisting of the pendulum and the Earth is correct?

A. The gravitational potential energy of the system is greatest at A and B.
B. The kinetic energy of mass m is greatest at point O.
C. The greatest rate of change of momentum occurs at A and B.
D. All of the above are correct.
E. Only (a) and (b) above are correct.


Answer: D

Physics & Space Science

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In space-based systems, such as the International Space Station, for example, highly efficient cooling systems are deployed that involve force convection boiling. In a laboratory experiment to develop one such system, a test liquid, which has the physical properties given, flows inside a vertical tube of 1.905 cm (or 0.75 in) inner diameter with a mass flux (or mass velocity) of 680 kg/(m2s). Determine the heat transfer coefficient at a point along the length of the tube at which the quality is 0.3. The wall temperature at this location was measured to be 1800C.


GIVEN
? 1.905 cm vertical tube with flowing, boiling water inside
? Test liquid with properties given above
? Mass flux (G)= 680 kg/(m2s)
FIND
(a) Heat transfer coefficient at a point along the length of the tube at which the quality is 0.3
ASSUMPTIONS
? The method of Chen is applicable
? Prandtl number of the fluid is Prl=1.0
PROPERTIES AND CONSTANTS

Physics & Space Science

A blue star has a higher surface temperature than a red star

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Physics & Space Science

If we add 700 J of heat to 12 moles of an ideal monatomic gas at constant volume, what will be the change in temperature of the gas? (R = 8.31 J/mol ? K)

A) 4.7 K B) 5.2 K C) 5.8 J D) 6.8 K E) 9.3 K

Physics & Space Science

What did Rutherford's famous scattering experiment help to prove in his day?

A. The nucleus of an atom is positively charged. B. The nucleus of an atom takes up a large portion of the space in an atom. C. The scattering with the gold foil could either be due to a single interaction with a nucleus or multiple interactions with electrons. D. Alpha particles are neutral and massive. E. Thomson's model was essentially correct.

Physics & Space Science