A high-voltage power line 23.0 m above the ground carries a current of 2 200 A. What is the magnetic field due to the current directly underneath the power line? (µ0 = 4? × 10^?7 T?m/A)
a. 19.1 µT
b. 60.1 µT
c. 60.9 mT
d. 12.0 mT
e. 12.0 T
a
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When the Sun rises it is located in the constellation Gemini. When the Sun sets later that same day it will be
A) in the constellation Aries. B) in the constellation Taurus. C) in the constellation Gemini. D) in the constellation Cancer. E) in the constellation Leo.
According to Galileo, which of these is a "natural" or "unforced" form of motion?
A) A stone falling straight downward. B) A book coming to rest as it slides along the floor. C) Both a stone falling straight downward and a sliding book coming to rest are natural motions. D) Neither a stone falling straight downward nor a sliding book coming to rest are natural motions.
A ball is thrown straight upward from ground level with a speed of 18 m/s. How much time passes before the ball strikes the ground if we disregard air resistance?
A) 3.7 s B) 1.8 s C) 1.1 s D) 0.6 s
A wave travels in a string at 60 m/s. A second string of 40% greater linear density has the same tension applied as in the first string. What will be the resulting wave speed in the second string?
a. also 60 m/s c. 72 m/s b. 51 m/s d. 55 m/s