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
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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
A blue star has a higher surface temperature than a red star
Indicate whether the statement is true or false
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
What did Rutherford's famous scattering experiment help to prove in his day?