Harlow Shapley concluded that the Sun was not located at the center of the Milky Way Galaxy by
A) mapping the distribution of stars in the galaxy.
B) mapping the distribution of gas clouds in the spiral arms.
C) mapping the distribution of globular clusters in the galaxy.
D) looking at the shape of the "milky band" across the sky.
E) looking at other nearby spiral galaxies.
C
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Torque: As shown in the figure, a given force is applied to a rod in several different ways. In which case is the torque about the pivot P due to this force the greatest?
A. 1 B. 2 C. 3 D. 4 E. 5
Two paths lead to the top of a big hill. One is steep and direct, while the other is twice as long but less steep. How much more potential energy would you gain if you take the longer path?
a) the same b) twice as much c) four times as much d) half as much e) you gain no PE in either case
Each of two parallel wires separated by 6.0 mm carries a 40-A current. These two currents are in the same direction. Determine the magnitude of the magnetic field at a point that is 5.0 mm from each of the wires
a. 2.6 mT b. zero c. 1.9 mT d. 1.6 mT e. 3.2 mT
The Doppler shift of ultrasonic waves can measure the speed of blood in an artery. If the frequency of the stationary source is 100 kHz and the reflected sound has a Doppler shift of 300 Hz, what is the blood flow speed? (The speed of sound inside the body is 1500 m/s.)
a. 1.0 m/s c. 2.2 m/s b. 1.5 m/s d. 3.3 m/s