In a speedometer test zone on a highway, you drive 4 miles in 5 minutes. During the test, your speedometer reading is 45 mi/hr. Your speedometer reading is
A. equal to your actual speed.
B. higher than your actual speed.
C. lower than your actual speed.
Answer: C
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Modern astronomers suspect the corona is heated by
a. shock waves rising from below the photosphere. b. the solar wind. c. magnetic carpets. d. shock waves rising from below the photosphere, the solar wind, and the solar magnetic field. e. none of the others.
A 25.0kg propeller may be considered a 4.5m-long rod spun about its center. What final angular velocity does the propeller have if a torque of 1100Nm is applied for 1.2s?
A. 31 rad/s B. 26 rad/s C. 7.8 rad/s D. 2.6 rad/s
Most of the planets discovered around other stars using the Doppler technique
A) are more massive than Earth and orbit very close to the star. B) are found around neutron stars. C) are less massive than Earth and orbit very close to the star. D) are more massive than Earth and orbit very far from the star. E) are less massive than Earth and orbit very far from the star.
A professional skier reaches a speed of 39.6 m/s on a 30° ski slope. Ignoring friction, what was the minimum distance along the slope the skier would have had to travel, starting from rest?
a. 110 m c. 320 m b. 160 m d. 640 m