A boxcar of mass 200 tons at rest becomes uncoupled on a 1.5° grade. If the track is considered to be frictionless, what speed does the boxcar have after 10 seconds?
a. 0.37 m/s
c. 2.6 m/s
b. 0.59 m/s
d. 4.3 m/s
C
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The Jovian planets can be eliminated as hosts for life because:
A) they do not have an atmosphere. B) they are too hot for liquid water to survive on the surface. C) they have water in the form of ice on the surface. D) they do not have solid surfaces.
Photon Energy: The human eye can just detect green light of wavelength 500 nm if it arrives at the retina at the rate of 2 × 10-18 W. How many photons arrive each second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
X-Ray Diffraction: A researcher is using x-rays to investigating a cubic crystal. He is looking at Bragg reflection from the planes parallel to the cube faces. He finds that when using x-rays with a wavelength of 0.165 nm, a strong first maximum occurs when the beam makes an angle of 23.5° with the planes. What is the spacing of adjacent atoms in this crystal?
Fill in the blank(s) with the appropriate word(s).
Suppose sand is leaking from an unpowered but moving railroad car. Since the sand is moving forward along with the car as it leaks out, it carries kinetic energy out of the car. This mass transfer will
A. Cause the car’s speed to increase. B. Cause the car’s speed to decrease. C. Have no effect on the car’s speed.