A force of 20 N is applied to a wire with an un-stretched length of 2.5 m. The wire gets 2.00 mm longer. The strain in the wire is
A. 
B. 
C. 
D. 
E. 
D.
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Estimate the maximum heat flux obtainable with nucleate pool boiling on a clean surface for (a) water at 100 kPa on brass, (b) water at 1 MPa on brass.
GIVEN
? Nucleate pool boiling on a clean surface
FIND
? The maximum heat flux obtainable for
(a) water at 1 atm on brass; and
(b) water at 10 atm on brass
ASSUMPTIONS
? Water is at saturation temperature
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for water from Table 9.2 for surface tension
A uniformly charged rod (length = 2.0 m, charge per unit length = 3.0 nC/m) is bent to form a semicircle. What is the magnitude of the electric field at the center of the circle?
A. 64 N/C B. 133 N/C C. 48 N/C D. 85 N/C E. 34 N/C
A ball thrown into the air follows a parabolic trajectory. At the highest point in the trajectory
A. both the velocity and the acceleration are zero. B. the velocity is zero, but the acceleration is not zero. C. neither the acceleration nor the velocity are zero. D. the acceleration is zero but the velocity is not zero.
Which two renewable energy resources provide the largest amount of energy today?
A) hydroelectric and wind B) hydroelectric and biomass C) active solar and photovoltaics D) photovoltaics and wind E) biomass and active solar