An 800-MW electric power plant has an efficiency of 30%. It loses its waste heat in large cooling towers. Approximately how much waste heat (in MJ) is discharged to the atmosphere per second?
a. 1 200
b. 1 900
c. 800
d. 560
e. 240
b
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Latent Heats: If you add 700 kJ of heat to 700 g of water originally at 70.0°C, how much water is left in the container? The latent heat of vaporization of water is 22.6 × 105 J/kg, and its specific heat capacity is 4186 J/kg ? K.
A. 429 g B. 258 g C. 340 g D. 600 g E. none
A 4.00 kg hollow sphere of radius 5.00 cm starts from rest and rolls without slipping down a 30.0 degree incline. If the length of the incline is 50.0 cm, then the velocity of the center of mass of the hollow sphere at the bottom of the incline is
A. 1.28 
B. 1.44
C. 1.65
D. 1.72
E. 1.98
In a Newtonian fluid, the applied shear stress divided by the viscosity is equal to the plastic shear strain rate raised to the power of _________.
What will be an ideal response?
Neutron stars are expected to spin rapidly because
a. they conserved angular momentum when they collapsed. b. they have high orbital velocities. c. they have high densities. d. they have high temperatures. e. the energy from the supernova explosion that formed them made them spin faster.