By what factor does the kinetic energy of a car change when its speed is tripled?
a) no change at all
b) factor of 3
c) factor of 6
d) factor of 9
e) factor of 12
Ans: d) factor of 9
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Predict the nucleate-boiling heat transfer coefficient for water boiling at atmospheric pressure on the outside surface of a 1.5-cm-OD vertical copper tube 1.5-m-long. Assume the tube-surface temperature is constant at 10 K above the saturation temperature.
GIVEN
? Water boiling at atmospheric pressure on the outside surface of vertical copper tube
? Tube outside diameter (D) = 1.5 cm = 0.015 m
? Tube length (L) = 1.5 m
? Tube surface temperature above saturation temperature (?Tx) = 10 K
FIND
? The nucleate-boiling heat transfer coefficient (hb)
ASSUMPTIONS
? The water is at saturation temperature
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for saturated water at 1 atm (Tsat = 100°C)
A steel bracket ABC (EI 5 4.2 3 106 N?m2) with span length L 5 4.5 m and height H 5 2 m is subjected to load P 5 15 kN at C. The maximum rotation of joint B is approximately:
(A) 0.18
(B) 0.38
(C) 0.68
(D) 0.98
The rings of Jupiter consist primarily of ________.
A. boulder-size rocks B. small particles C. hydrogen and helium D. solid rings
The half-life of a muon is 2.20 ?s as measured in a stationary reference frame. What is the half life of the muon (in ?s) when it is moving with a speed of v = 0.800c?
A. 8.13 B. 2.75 C. 3.67 D. 15.8 E. 1.32