Wave Characteristics: A laser beam takes 24 ms to travel from a rocket to the reflective surface of a planet and back to the rocket. How far is the rocket from this planet's surface? (c = 3.0 × 108 m/s)
A. 2400 km
B. 1200 km
C. 1800 km
D. 3600 km
E. 4800 km
Answer: D
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Rotational Kinetic Energy: Consider a solid uniform sphere of radius R and mass M rolling without slipping. Which form of its kinetic energy is larger, translational or rotational?
A. Translational kinetic energy is larger. B. Rotational kinetic energy is larger. C. Both are equal. D. You need to know the speed of the sphere to tell.
"Absolute Zero" is what temperature on the Celsius and Fahrenheit scales respectively?
A) -459°C, -273°F B) -273°C, -212°F C) -212°C, -273°F D) -273°C, -459°F E) 0°C, 459°F
Weather always occurs in the lowest layer of the atmosphere, the
A) mesosphere. B) thermosphere. C) ionosphere. D) stratosphere. E) troposphere.
Two wires A and B with circular cross sections are made of the same metal and have equal lengths, but the resistance of wire A is three times greater than that of wire B. What is the ratio of the cross-sectional area of A to that of B?
1.3 2.?3 3.1 4.1/?3 5.1/3