The short lifetime of muons created in the upper atmosphere of the Earth would not allow them to reach the surface of the Earth unless their lifetime increased by time dilation. From the reference system of the muons, the muons can reach the surface of the Earth because
a. time dilation increases their velocity.
b. time dilation increases their energy.
c. length contraction decreases the distance to the Earth.
d. the relativistic speed of the Earth toward them is added to their velocity.
c
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When Lillian hangs from a pair of gym rings, the upward support forces by the rings will always
A) each be half her weight. B) each be equal to her weight. C) add up to equal her weight. D) add up to more than her weight.
A wave travels in a string at 58 m/s. A second string of 10% 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 58 m/s b. 61 m/s c. 180 m/s d. 55 m/s e. 61 m/s
To which of the following values of n does the longest wavelength in the Balmer series correspond?
A) 3 B) 5 C) 1 D) 7 E) ? (very large)
An electric motor produces 2.0 hp in a Vrms = 120 V circuit. Using 1 hp = 746 W, how long would it take this motor to do 1.0 kWh of work?
a. 0.67 min c. 1.3 min b. 0.67 h d. 1.3 h