All RR Lyrae stars are about 5 times the Sun's luminosity
Indicate whether the statement is true or false
FALSE
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A flat rectangular loop of wire carrying a 4.0-A current is placed in a uniform 0.60-T magnetic field. The magnitude of the torque acting on this loop when the plane of the loop makes a 30° angle with the field is measured to be 1.1 N ? m
What is the area of this loop? A) 0.80 m2 B) 0.53 m2 C) 0.40 m2 D) 0.20 m2 E) 0.26 m2
During an isothermal process, 5.0 J of heat is removed from an ideal gas. What is the work done in the process?
A. zero B. -5.0 J C. +5.0 J D. none of the above
The escape speed from the moon is what fraction of Earth's escape speed? (Earth/Lunar mass ratio = 81.3; Earth/Lunar radius ratio = 3.67)
A) 0.045 B) 0.17 C) 0.61 D) 0.41 E) 0.21
All celestial objects rise in the east and set in the west because
A. Earth is rotating from west to east. B. Earth is orbiting around the Sun from east to west. C. Earth is rotating from east to west. D. the celestial sphere is rotating from east to west.