Imagine we have an adjustable slit that we can make wider or narrower. If we shine light of a fixed intensity on the slit, and then crank the slit so its width decreases (while keeping other things the same), will the light at the center of the central peak on the display screen (A) remain the same, (B) get brighter, or (D) get dimmer?
A. Remain the same
B. Get brighter
D. Get dimmer
D. Get dimmer
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Two parallel and coaxial current loops of radius a are placed a distance 2L apart. When you look along the axis at the loops, the current in one is clockwise, and counterclockwise in the other. At a point on the axis half way between the loops the magnetic field in T has magnitude
A.
B.
.C.
.D.
.E.
.A 90-kg halfback running north with a speed of 10 m/s is tackled by a 120-kg opponent running south at 5.0 m/s. The collision is perfectly inelastic. Compute the velocity of the two players just after the tackle
a. 1.4 m/s south c. 2.8 m/s north b. 2.8 m/s south d. 1.4 m/s north
If you made a plot of open clusters on a star map, they would be
A. concentrated along the Galaxy's disk. B. evenly scattered on the page. C. clustered away from the Galactic bulge. D. spherically arranged in a halo.
A string, 0.28 m long and vibrating in its third harmonic, excites an open pipe that is 0.82 m long into its second overtone resonance. The speed of sound in air is 345 m/s. The speed of transverse waves on the string is closest to
A) 120 m/s. B) 110 m/s. C) 100 m/s. D) 98 m/s. E) 91 m/s.