A magnet will become weaker if it is
A) dropped on a hard surface.
B) held in a hot flame.
C) either
D) neither
Answer: C
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Where are most heavy elements made?
A) in the interstellar medium B) in stars and supernovae C) in the Big Bang, when the universe first began D) none of the above E) all of the above
Waves on a lake pass under a floating bird causing the bird to bob up and down with a period of 2.5 seconds. If the distance from wave trough to wave trough is 3.0 meters, what is the speed of the wave?
A) 0.21 m/s B) 1.2 m/s C) 1.9 m/s D) 2.1 m/s E) 1.5 m/s
The International Space Station is orbiting at an altitude of about 370 km above the earth's surface. The mass of the earth is 5.97 × 1024 kg, the radius of the earth is 6.38 × 106 m, and G = 6.67 × 10-11 N • m2/kg2
Assuming a circular orbit, (a) what is the period of the International Space Station's orbit? (b) what is the speed of the International Space Station in its orbit?
A 120-m long metal wire having a resistivity of 1.68 × 10-8 ? ? m has a resistance of 6.0 ?. What is the diameter of the wire?
A) 0.065 mm B) 0.65 mm C) 0.65 cm D) 0.65 m