A water pump draws about 3.7 A when connected to 220 V. What is the cost (with electrical energy at 6.0 cents per kWh) of running the pump for 7.0 h?
a. 2.5 cents
b. 9.0 cents
c. 34 cents
d. 68 cents
e. 26 cents
c
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Sonic Booms: As a supersonic airplane increases its speed more and more, the half-angle of the conical shock wave
A. increases. B. decreases. C. is not affected.
Why are Cepheid variables important to understanding the formation of the Universe?
A) Because they rotate at known speeds. B) Because their brightness is a function of distance from Earth. C) Because their luminosity is a function of their pulsation period. D) Because they are at known distances from Earth.
A gas is placed in a container, which is immersed in an ice-water mixture as shown below
This diagram represents the carbon dioxide cycle. Which position in the diagram represents the part of the cycle in which carbon dioxide is turned into carbonate minerals and rock?
A) Position 1 B) Position 2 C) Position 3 D) Position 4