A 4.0-mF capacitor initially charged to 50 V and a 6.0-mF capacitor charged to 30 V are connected to each other with the positive plate of each connected to the negative plate of the other. What is the final charge on the 6.0-mF capacitor?
a. 20 mC
b. 8.0 mC
c. 10 mC
d. 12 mC
e. 230 mC
d
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Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 4 sin (5x) cos (6t) where x is in m and t is in s. What is the approximate frequency of the interfering waves?
a. 3 Hz b. 1 Hz c. 6 Hz d. 12 Hz e. 5 Hz
Supernova remnants _____
a. always contain pulsars, because pulsars supply the ionizing radiation b. often last longer than a pulsar does, so the central pulsar may no longer be visible c. rarely contain pulsars, because pulsar radiation disrupts the remnant d. may not contain a pulsar, if the supernova explosion kicked the pulsar away at high speed e. never contain pulsars
Which of the following types of data provide evidence that helps us understand the life tracks of low-mass stars?
A) H-R diagrams of globular clusters B) H-R diagrams of open clusters C) observing a low-mass star over many years D) spacecraft observations of the Sun
The ionization energy of the hydrogen atom is 13.6 eV. What is the energy of the n = 7 state?
a. 11.7 eV b. –11.7 eV c. 0.28 eV d. –0.28 eV e. 1.94 eV