Relative to a stationary observer, a moving clock
A. always runs slower than normal.
B. always runs faster than normal.
C. keeps its normal time.
D. Any of these choice could be correct depending on the relative velocity.
A. always runs slower than normal.
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Suppose I push a block along a tabletop at a constant velocity. If I exert a constant forward force of 
on the block and push it through a distance D, I do work on the block equal to ?F?D. Since the block’s kinetic energy does not change, friction must be exerting a backward force on the block of the same magnitude as 
(so that the net force on the block is zero, as required to maintain the block’s constant velocity). What work does the friction force do on the block?
A. No work
B. ? 
D
C. + D
D. Some negative work, but we need more information to determine exactly how much.
E. Some positive work, but we need more information to determine exactly how much.
If the plate temperature is 170°C and the gas temperature is 30°C, calculate (a) the average heat transfer coefficient, (b) the rate of heat transfer between the plate and the gas and (c) the local heat flux 2 m from the leading edge.
The heat transfer coefficient for a gas flowing over a thin flat plate 3-m-long and
0.3-m-wide varies with distance from the leading edge according to
GIVEN
• Gas flowing over a 3-m-long by 0.3-m-wide flat plate
• Heat transfer coefficient (hc) is given by the equation above
• The plate temperature (TP) = 170°C
• The gas temperature (TG) = 30°C
FIND
(a) The average heat transfer coefficient ( h c) (b) The rate of heat transfer (qc) (c) The local heat flux at x = 2 m (qc (2)/A)
ASSUMPTIONS
• Steady state prevails
SKETCH
An index of refraction less than one for a medium would imply that
A) that the speed of light in the medium is the same as the speed of light in vacuum. B) that the speed of light in the medium is greater than the speed of light in vacuum. C) that the speed of light in the medium is less than the speed of light in vacuum. D) refraction is not possible. E) reflection is not possible.
A high-voltage transmission line carries 500 A at 700,000 V. What is the power carried by the line?
a. 100 MW c. 700 MW b. 350 MW d. 70 MW