Globular clusters can be used to estimate the distance to galaxies by measuring the clusters' ____
a. angular diameter
b. mass
c. orbital speed
d. age
e. recession velocity
a
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Which of these will penetrate into lead?
A) alpha particle B) beta particle C) gamma ray. D) all of the above
Applications to Astronomy: Many supernovas are thought to result in
A. neutron stars. B. red giant stars. C. regular stars like our sun. D. white dwarfs.
Power: A series ac circuit has a peak current of 1.0 A with a frequency of 7 kHz. If the resistance of the circuit is 55 k?, the capacitance of the circuit is 20 ?F, and the inductance of the circuit is 26 H, determine the average power of the circuit over one cycle.
A. 28,000 W B. 83,000 W C. 8300 W D. 4400 W
A projectile is launched vertically upward at 40 m/s. If air resistance is negligible, its speed upon returning to its starting point is
1) less than 40 m/s. 2) 40 m/s. 3) more than 40 m/s. All along the ball's trajectory, its acceleration is 4) g downward. 5) g at an angle. 6) zero. If air resistance does affect motion, then the ball's speed upon returning to its starting point is 7) less than 50 m/s. 8) 50 m/s. 9) more than 50 m/s.