A constant net force on a rail-road car produces constant
A) velocity.
B) acceleration.
C) both of these
D) neither of these
Answer: B
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The terrestrial planets, ranked in order of decreasing atmospheric density, are
a. Venus, Earth, Mars, Mercury b. Venus, Mars, Earth, Mercury c. Mercury, Mars, Earth, Venus d. Mars, Venus, Mercury, Earth
A 20-g bullet moving at 1000 m/s is fired through a one-kg block of wood emerging at a speed of 200 m/s. What is the change in the kinetic energy of the bullet-block system as a result of the collision assuming the block is free to move?
a. 0 J c. 9.5 kJ b. -9.5 kJ d. -18 J
Light of wavelength 600 nm in air goes into a medium where the index of refraction is 1.73. What is the frequency of this light in the medium?
A. 
B. 
C. 
D. 
E. 
A nuclear reactor fuel rod is a circular cylinder 6 cm in diameter. The rod is to be tested by cooling it with a flow of sodium at 205°C and a velocity of 5 cm/s perpendicular to its axis. If the rod surface is not to exceed 300°C, estimate the maximum allowable power dissipation in the rod.
GIVEN
• Cylinder in a cross flow of liquid sodium
• Cylinder diameter (D) = 6 cm = 0.06 m
• Sodium temperature (T?) = 205°C
• Sodium velocity (U?) = 5 cm/s = 0.05 m/s
• Maximum rod surface temperature (Ts) = 300°C FIND
• The maximum allowable power dissipation Gq
ASSUMPTIONS
• Steady state
• Turbulence in the sodium flow approaching the rod is low
• Heat generation per unit volume in the rod is uniform
SKETCH
