A medium-mass star evolves into a red giant because ____
a. the core expands as new fusion products collect there
b. the surface of the star becomes cooler
c. energy from hydrogen shell burning and helium fusion forces the outer layer to expand
d. the surface of the star becomes hotter
e. increased stellar winds carry large amounts of material off of the surface of the star
c
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A charged particle (mass = M, charge = Q> 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with a speed V?
A. QVB toward the east B. Zero C. QVB toward the west D. QVB upward E. QVB toward the south
A spherical mirror has a radius of curvature of 22 cm. If the mirror is concave, its focal length is
A) -11 cm. B) -22 cm. C) 11 cm. D) -44 cm. E) 22 cm.
A 2.15 kg lightly damped harmonic oscillator has an angular oscillation frequency of 0.261 rad/s. If the maximum displacement of occurs when t = 0.00 s, and the damping constant b is 0.74 kg/s what is the object's displacement when t = 4.01 s?
A) 0.50 m B) 0.43 m C) 0.58 m D) 0.65 m
For radio transmission, which has the higher frequency?
A) carrier wave B) sound wave C) neither of these