A horizontal uniform 1.20-N meter stick is held up by two vertical strings, one at the 20-cm mark and the other at the 60-cm mark. What is the tension in the string at the 60-cm mark?
A. 0.30 N
B. 0.45 N
C. 0.60 N
D. 0.90 N
E. 1.0 N
Answer: D
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Three identical particles labeled A, B, and C enter a region of space where the magnetic field points away from the viewer perpendicular to the plane of the paper in the drawing in the next column. The particles’ velocities have the same magnitude and all lie in the plane of the paper, but they have the different directions shown. Which particle experiences the largest magnetic force? Answer A, B, or C, or choose from the answers below.
A.A
B.B
C.C
D. Both A and C.
E. The force magnitude has the same nonzero magnitude for all three particles.
F. The magnetic force on all three particles is zero.
A main-sequence star of 8.5 solar masses can become a white dwarf by
a. exceeding the Chandrasekhar limit. b. losing mass in a close binary. c. gaining mass. d. remaining at 8.5 solar masses.
A star (no matter what its mass) spends most of its life:
A) as a protostar. B) as a main sequence star. C) as a planetary nebula. D) as a red giant or supergiant. E) as a T Tauri variable star.
What is the temperature in kelvins of the visible surface of the Sun?
a. 600 K b. 6 million K c. 6 billion K d. 6000 K