A positive point charge Q is fixed on a very large horizontal frictionless tabletop. A second positive point charge q is released from rest near the stationary charge and is free to move
Which statement best describes the motion of q after it is released? A) Its speed will be greatest just after it is released.
B) Its acceleration is zero just after it is released.
C) As it moves farther and farther from Q, its acceleration will keep increasing.
D) As it moves farther and farther from Q, its speed will decrease.
E) As it moves farther and farther from Q, its speed will keep increasing.
E
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You have observed a star and classified it as a white dwarf. It has a surface temperature of 3000 K and a luminosity of 10?3 times that of the Sun star based on its position in the H-R diagram. Can you determine its mass by plotting its position on an H-R diagram?
A) Yes, its mass is 0.3 MSun. B) Yes, its mass is 3 MSun. C) Yes, its mass is 30 MSun. D) No, a white dwarf's mass cannot be determined from its position on the H-R diagram.
The symbol indicating the atomic number of a nucleus is __________
Fill in the blank(s) with correct word
In a plot of probability of finding the electron in the hydrogen ground state versus the distance from the nucleus, the maximum occurs
a. at a0, the first Bohr radius. b. at slightly less than a0. c. at slightly more than a0. d. at 2 a0.
A conducting bar moves as shown near a long wire carrying a constant 80-A current. If a = 1.0 mm, b = 20 mm, and v = 5.0 m/s, what is the potential difference, Va ? Vb?
a.
?0.24 mV
b.
+0.24 mV
c.
?0.19 mV
d.
+0.19 mV
e.
?0.76 mV