A wave has peaks and troughs that can move matter up and down when the wave interacts with matter. The frequency of a wave is

A) the number of peaks passing by any point each second.
B) the speed at which a wave moves through space.
C) the distance between two adjacent peaks of a wave.


A) the number of peaks passing by any point each second.

Physics & Space Science

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A white dwarf is

A) what most stars become when they die. B) a precursor to a black hole. C) an early stage of a neutron star. D) a brown dwarf that has exhausted its fuel for nuclear fusion.

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In the figure, a 1.6-kg weight swings in a vertical circle at the end of a string having negligible weight. The string is 2 m long. If the weight is released with zero initial velocity from a horizontal position, its angular momentum (in kg?m2/s) at the lowest point of its path relative to the center of the circle is approximately

A. 40 B. 10 C. 30 D. 20 E. 50

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A uniform solid 5.25-kg cylinder is released from rest and rolls without slipping down an inclined plane inclined at 18° to the horizontal. How fast is it moving after it has rolled 2.2 m down the plane?

A) 4.3 m/s B) 3.0 m/s C) 2.6 m/s D) 5.2 m/s E) 3.7 m/s

Physics & Space Science

The average distance between stars in the neighborhood of the Solar System is about ________.

A. 4 AU B. 4 kiloparsecs C. 4 light-years D. 4 arc seconds

Physics & Space Science