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
Answer: B
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An auto mechanic is attempting to loosen a bolt in an engine using a large wrench, but to no avail. If she applies a force of 510N perpendicular to the wrench she is using, applied at 0.75m from the axis of rotation of the bolt, what is the value of the friction force applied to the outer surface of the bolt’s threads? The threaded portion of the bolt has diameter 1.2cm.
A. 3.2 kN B. 510N C. 32kN D. 1.6kN E. 16kN
Which component of Earth's geology is believed to have been largely responsible for the long-term climate stability that has allowed life to evolve?
A) global magnetism B) seismic activity C) plate tectonics D) erosion and weathering
The minimum sound intensity that can be detected by the human ear is called the ______________ of hearing
Fill in the blank(s) with correct word
The figure shows the distance versus time graph of an object
The velocity of the moving object is
a.
zero.
b.
constant.
c.
increasing.
d.
decreasing.
e.
not determinable.