A 600-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. 1400 MJ
c. 800 MJ
b. 1900 MJ
d. 560 MJ
A
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Series/Parallel Circuits: An ideal 10.0-V dc is connected across a 590.0-?, resistor in series with an 840.0-? resistor. What is the potential drop across the 590.0 ? resistor?
A. 4.1 V B. 5.9 V C. 14 V D. 7.0 V
Which of the following is not considered crucial for life to exist on some world?
A) a liquid, such as liquid water B) a source of energy that can be used by life C) a source of nutrients D) an atmosphere
If the acceleration vector of an object is directed parallel to the velocity vector,
A) the object is turning. B) the object is speeding up. C) the object is slowing down. D) the object is not moving. E) this situation would not be physically possible.
The 1560-kg solid steel door to a bank vault is 2.00 m high, 1.00-m wide and 10-cm thick. One hinge is 60.0 cm down from the top on the left-hand side of the door. The other hinge is 30.0 cm up from the bottom. What horizontal force, in what direction, does the door exert on the lower hinge?
a. 6950 N, left b. 6950 N, right c. 7640 N, left d. 7640 N, right e. 15,300 N, left