The horizontal component of the buttressing force at the base of a pointed arch is
A)
less than that of a rounded arch.
B)
equal to that of a rounded arch.
C)
greater than that of a rounded arch.
D)
zero in magnitude.
A
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Identify a true statement about main-sequence stars
A) They balance their gravity by fusing hydrogen. B) They generate energy by breaking uranium isotopes. C) They do not increase in size as they consume their fuel. D) They do not undergo any molecular change during their life spans.
As a 3.0-kg bucket is being lowered into a 10-m deep well, starting from the top, the tension in the rope is 19.6 N. The acceleration of the bucket will be:
a. 6.5 m/s2 downward. c. zero. b. 9.8 m/s2 upward. d. 3.3 m/s2 downward.
The H-R diagram is a plot of stars' ________.
A. luminosity vs. temperature B. mass vs. diameter C. temperature vs. mass D. mass vs. luminosity
An electron moving in the positive x direction experiences a magnetic force in the positive z direction. If Bx = 0, what is the direction of the magnetic field?
a. negative y direction b. positive y direction c. negative z direction d. positive z direction e. negative x direction