A wave moves in a rope with a certain wavelength. A second wave is made to move in the same rope with twice the wavelength of the first wave. The frequency of the second wave is half the frequency of the first wave
Indicate whether the statement is true or false
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A 7.0-? resistor is connected across the terminals of a battery having an internal emf of 10 V. If there is a 0.50-A current through the circuit, what is the internal resistance of the battery?
A) 13 ? B) 20 ? C) 10.8 ? D) 27.0 ?
An elephant and a feather fall through the air. The force of air resistance is
1) greater on the feather 2) greater on the elephant 3) the same on each because 4) the feather weighs less. 5) the elephant encounters more air because of his greater size and speed. 6) each is under the influence of gravitational force alone.
A 4.0-kg block slides down a 35° incline at a constant speed when a 16-N force is applied acting up and parallel to the incline. What is the coefficient of kinetic friction between the block and the surface of the incline?
A. 0.20 B. 0.23 C. 0.26 D. 0.33 E. 0.41
The key to finding quasars' distances was
A) planetary nebula in M51. B) globular clusters in the halo of M87 in Virgo. C) a Type I supernova in the spiral arm of 3C87. D) the luminosity of 3C52 from the Doppler shift and the Fisher-Tully relation. E) the huge redshifts of the hydrogen lines in 3C273.