The spectra, such as Ångström found for low-pressure gas in a discharge tube, are of what type?
A. continuous
B. discrete
C. blackbody
D. band
E. dark-line
B. discrete
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A large coal-fired electric generating plant burns about 1000 kg [one tonne] of coal every 10 seconds. About much of the tonne actually goes into producing electric energy?
A) 990 kg B) 400 kg C) 800 kg D) 100 kg E) 40 kg
On an H-R diagram, stellar masses
A) can be determined for main-sequence stars but not for other types of stars. B) are greatest in the lower left and least in the upper right. C) decrease from upper left to lower right. D) are impossible to determine.
A 4.0 kg mass is moving with speed 2.0 m/s. A 1.0 kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping?
A) the 4.0 kg mass B) the 1.0 kg mass C) Both travel the same distance. D) Cannot be determined from the information given.
A 1200-kg cannon suddenly fires a cannonball at What is the recoil speed of the cannon? Assume that frictional forces are negligible and the cannon is fired horizontally
A) 2.9 m/s B) 35 m/s C) 3.5 m/s D) 3.2 m/s