A fireman, 57.6 m away from a burning building, directs a stream of water from a fire hose at an angle of 35.2° above the horizontal. If the initial speed of the stream is 42.7 m/s, at what height will the stream of water strike the building?
a. 44.2 m
b. 13.8 m
c. 27.3 m
d. 30.8 m
e. 36.4 m
c
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At temperatures above the equi-cohesive temperature, the crystalline areas are _________than the grain boundaries.
Fill in the blank(s) with the appropriate word(s).
Thermal Expansion: As shown in the figure, a bimetallic strip, consisting of metal G on the top and metal H on the bottom, is rigidly attached to a wall at the left. The coefficient of linear thermal expansion for metal G is greater than that of metal H. If the strip is uniformly heated, it will
A. curve upward. B. curve downward. C. remain horizontal, but get longer. D. remain horizontal, but get shorter. E. bend in the middle.
A conical pendulum is constructed with a string 2.5 m in length. The pendulum is set in horizontal circular path about the vertical axis. If the angular velocity of the conical pendulum is a constant 2.8 rad/s, then the angle the string makes with the vertical axis is
A. 48 degrees. B. 60 degrees. C. 71 degrees. D. 75 degrees. E. 80 degrees.
The surface of a protostar radiates energy while its core
A) shrinks and cools. B) shrinks and maintains a constant temperature. C) shrinks and heats. D) expands and cools.