Which of the following hypothetical discovery would be most surprising given our current theory of how stars and planets are born?
A) a star system with 7 planets, 2 of which rotate in a direction opposite to their orbital directions
B) a star system with 5 planets, each orbiting in a different plane and in different directions
C) a star system with a disk of gas but no planets
D) a star system with 9 planets, in which 6 of the planets have no moons
B) a star system with 5 planets, each orbiting in a different plane and in different directions
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Angular Momentum: If the answer to your calculation has units of kg ? m2/s2, what type of quantity could it be? (There could be more than one correct choice.)
A. force B. work C. angular momentum D. linear momentum E. power F. rotational kinetic energy G. moment of inertia H. torque
The SI unit of pressure is the pascal
a. True b. False Indicate whether the statement is true or false
A parallel plate capacitor is charged to voltage V and then disconnected from the battery. Leopold says that the voltage will decrease if the plates are pulled apart. Gerhardt says that the voltage will remain the same. Which one, if either, is correct, and why?
a. Gerhardt, because the maximum voltage is determined by the battery. b. Gerhardt, because the charge per unit area on the plates does not change. c. Leopold, because charge is transferred from one plate to the other when the plates are separated. d. Leopold, because the force each plate exerts on the other decreases when the plates are pulled apart. e. Neither, because the voltage increases when the plates are pulled apart.
At what frequency will a 50.0-mH inductor have a reactance XL = 700 ??
A. 352 Hz B. 777 Hz C. 1.25 kHz D. 2.23 kHz E. 14 kHz