When light passes through two or more narrow slits, an alternating dark and bright pattern is observed on a screen because of
a. interference.
b. diffraction.
c. specular reflection.
d. diffuse reflection.
e. polarization.
a
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An object on the flat bed of a truck that is accelerating along a straight horizontal road. The coefficient of static friction is 0.300 in this case. Of the following choices, which is the lowest value of acceleration that would result in the object sliding on the bed of the truck?
a. 0.280 m/s2 b. 0.310 m/s2 c. 2.93 m/s2 d. 2.99 m/s2 e. 3.02 m/s2
You want to find a mass of a star on the main sequence of the H-R diagram. What do you need?
a. The star has to be in a visual binary. b. The star has to be in a spectroscopic binary. c. You need the star's luminosity. d. You need the star's absorption spectra.
A car is going past a radio station at a speed of 40.0 m/s. If the radio station broadcasts at a frequency of 74.5 MHz, what change in frequency does the driver observe?
A) 9.93 Hz B) 99.3 Hz C) 993 Hz D) 7.45 Hz E) 74.5 Hz
A 4.20-g bullet embeds itself in a 20.0-kg block, which is attached to a horizontal spring with a force constant of 980 N/m
The maximum compression of the spring is 2.40 cm. What is the speed of the bullet just before it hits the block? A) 800 m/s B) 700 m/s C) 672 m/s D) 900 m/s E) 952 m/s