A pulley has two supporting strands. To lift a load 1 meter means you will have to pull a distance of
A) 1/2 m.
B) 1 m.
C) 2 m.
D) more than 2 m.
Answer: C
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The ideal efficiency for a heat engine operating between the temperatures 2700 K and 300 K is
A) 10%. B) 24%. C) 80%. D) 89%. E) none of the above
A 90.% efficient transformer supplies 3.0 Amperes at 6.0 volts. If the input voltage is 120. v, what is the input current?
What will be an ideal response?
A red crab crawling very deep in the water where sunlight is very dim appears
A) red. B) orange. C) cyan. D) brown. E) black.
What is a shock wave?
a. A wave caused by an earthquake. b. Any loud sound moving through the air. c. The edge of the pressure cone caused by superimposed waves from an object moving faster than sound. d. The point of the pressure cone caused by superimposed waves. e. The distance from the crest to the trough of a set of waves.