What is characteristic of a main sequence star?
A) It has a mass less than the Sun's.
B) It has rapid rotation and a strong stellar wind.
C) Nuclear fusion in the core varies due to the amount of gravitational contraction that occurs and which heavy elements are produced.
D) The rate of nuclear energy generated in the hydrogen to helium fusing core equals the rate radiated from the surface.
E) All of the above are correct.
D
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If the temperature changes by
then what is the change in temperature in Celsius?
A. 40
B. 32
C. 26
D. 20
E. 15
A uniform magnetic field is directed along the x axis. For what orientation of a flat, rectangular coil is the flux through the rectangle a maximum?
1.It is a maximum in the xy plane. 2.It is a maximum in the xz plane. 3.It is a maximum in the yz plane. 4.The flux has the same nonzero value for all these orientations. 5.The flux is zero in all cases.
Which of the following is TRUE for a particle traveling a circular path at a constant speed?
a) The velocity of the particle is different at different points on the circular path. b) The acceleration is directed tangent to the path. c) The magnitude of the acceleration is constant. d) The particle must be moving faster if the radius of curvature is smaller. e) The particle is decelerating if the radius of curvature is higher. f) The mass of the particle does not affect the speed at which it travels.
A 400-W computer (including the monitor) is turned on for 8.0 hours per day. If electricity costs 10ยข per kWh, how much does it cost to run the computer annually for a typical 365-day year?
A) $1200 B) $15 C) $120 D) $17 E) $150