A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this trip?
A) 84 km/h
B) 89 km/h
C) 90 km/h
D) 91 km/h
B
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In a laser
a. light is amplified by stimulated emission of radiation. b. the emitted light is monochromatic. c. the emitted light is coherent. d. there is a population inversion of electrons in atoms. e. all of the above
A heat engine with an efficiency of 30% performs 2500 J of work. How much heat is discharged to the lower temperature reservoir?
A) 7100 J B) 8300 J C) 750 J D) 5800 J E) 1400 J
The total number of protons and neutrons in the nucleus of an tom is referred to as its
A) atomic mass number B) average atomic mass C) proton number D) atomic number
On a scale in which the distance from Earth to the Sun is about 15 meters, the distance from Earth to the Moon is ________
A) about 30 meters B) small enough to fit within your hand C) about 1 meter D) about 5 meters