Which of the following is the strongest evidence in support of the hypothesis that the Solar System was formed by the collapse of a gas and dust nebula?
A. the discovery of extra solar planets
B. images of other stars with gas and dust disks surrounding them
C. the existence of large clouds
D. radiometric dating of dust from the Moon's surface
Answer: B
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________ galaxies have smaller nuclei and loosely wound arms compared to ________ galaxies.
A. Sa; Sb B. Sd; Sc C. Sa; S0 D. E0; S0
A 500-Hz whistle is moved toward a listener at a speed of 10.0 m/s. At the same time, the listener moves at a speed of 20.0 m/s in a direction toward the whistle. What is the apparent frequency heard by the listener? (The speed of sound is 340 m/s.)
a. 473 Hz c. 533 Hz b. 485 Hz d. 545 Hz
Work Done by a Gas: A gas expands from an initial volume of 0.040 m3 and an initial pressure of 210 kPa to a final volume of 0.065 m3 while its temperature is kept constant. How much work is done by the gas? (R = 8.31 J/mol ? K)
A. 3.7 kJ B. 4.1 kJ C. 5.3 kJ D. 5.6 kJ E. 7.9 kJ
A ball is thrown straight up. It reaches its highest point and then falls back. Which of the following is the correct statement?
A. Throughout its motion, the ball's acceleration is zero B. At the highest point in its motion, the ball's acceleration is zero C. At the highest point in its motion, the ball's velocity and acceleration are zero D. At the highest point in its motion, the ball's velocity is zero E. Throughout its motion, the ball's velocity is zero