A planet is detected via the Doppler technique. The shape of the periodic velocity pattern tells us
A) the planet's size.
B) the planet's mass.
C) the planet's density.
D) the orbital period of the planet.
E) the orbital eccentricity of the planet.
E
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Earth continually moves about 30 km/s through space, which means the wall you stand next to also is moving at 30 km/s. When you jump vertically the wall doesn't slam into you because
A) the speeds of you and Earth cancel out. B) you're moving horizontally just as fast as the wall. C) your upward motion is small compared with Earth's speed. D) motion of the Sun counteracts your motion.
Reverberation is a phenomenon you would be most likely to hear if you sing in
A) the shower. B) a small drape-covered room. C) a large drape-covered room. D) the desert.
A 1000-kg car is moving at 30 m/s around a horizontal unbanked curve whose diameter is 0.20 km. What is the magnitude of the friction force required to keep the car from sliding?
A) 9000 N B) 9800 N C) 300 N D) 900 N E) 3000 N
Three materials with n1 < n2 < n3 are arranged in layers of uniform thickness. A light ray in air enters the first layer at an angle of incidence of 40° and the ray eventually exits the third layer at the refracted angle q in air. What is the value of q?
a. Some angle more than 40°. c. 40°. b. Insufficient information to answer. d. Some angle less than 40°.