A cloud fragment too small to collapse into a main sequence star becomes a:
A) white dwarf.
B) pulsar.
C) T Tauri object.
D) brown dwarf.
E) planet of another star.
D
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Solenoid: An ideal solenoid having 200 turns and carrying a current of 2.0 A is 25 cm long. What is the magnitude of the magnetic field at the center of the solenoid? (?0 = 4? × 10-7 T ? m/A)
Fill in the blank(s) with the appropriate word(s).
If two stars are the same size and one is twice the temperature of the other, how much more luminous is the hotter one?
What will be an ideal response?
A proton and a deuteron are moving with equal velocities perpendicular to a uniform magnetic field. A deuteron has the same charge as the proton but has twice its mass. The ratio of the magnetic force on the proton to that on the deuteron is:
a. 0.5. b. 1. c. 2. d. There is no magnetic force in this case.
A 1938 nickel has a diameter of 21.21 mm, a thickness of 1.95 mm, and weighs 0.04905 N. What is its density?
A) 1.37 × 10-4 kg/m3 B) 1.82 × 103 kg/m3 C) 19.3 × 103 kg/m3 D) 3.63 × 103 kg/m3 E) 7.26 × 103 kg/m3