What is the reason for the seasons on Earth?
a) Earth is cloest to the Sun in July, farthest from the Sun in January
b) Earth is tilted with respect to the Sun by about 23.5 degrees
c) Earth orbits the Sun more slowly in winter, faster in summer
d) Earth rotates more slowly in winter, faster in summer
e) Earth's Moon blocks more sunlight from reaching Earth in winter than in summer
Ans: b) Earth is tilted with respect to the Sun by about 23.5 degrees
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Velocity Addition: A rocket is traveling away from Earth at 90% the speed of light. The captain turns on a laser light. What is the speed of the light as measured by an Earth-based astronomer if the captain aims the laser (a) directly forward or (b) directly backward?
What will be an ideal response?
Venus may have started with an ocean's worth of water. Where is its water now?
A) The original water remains vaporized in the atmosphere due to Venus's intense heat. B) Most of the water is frozen beneath the surface. C) Most of the water combined with rocks in chemical reactions. D) The water was lost when ultraviolet light broke apart water molecules and the hydrogen escaped to space. E) The water changed to carbon dioxide through chemical reactions.
Two uniform rods, each of length 2.0 m, are bent to form semicircles. One rod has a charger per unit lent of 1.5 nC/m, and the other has a charge per unit length of –1.5 nC/m. The semicircles are joined to make a circle. What is the magnitude of the electric field at the center of the circle?
a. 42 N/C b. 84 N/C c. 34 N/C d. 68 N/C e. 0
Transverse waves are traveling on a 1.00-m-long piano string at 500 m/s. If the points of zero vibration occur at one-half wavelength (where the string is fastened at both ends), find the frequency of vibration
a. 250 Hz b. 500 Hz c. 1000 Hz d. 2000 Hz e. 2500 Hz