The Hertzprung—Russell diagram is a plot of
A) radial velocity against distance
B) apparent brightness against time
C) luminosity against distance
D) luminosity against surface temperature
D
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Everything looks red through a red filter because
A) the filter emits red light and absorbs other colors. B) the filter absorbs red light and emits other colors. C) the filter transmits red light and absorbs other colors. D) the filter reflects red light and transmits other colors.
An 8000-kg aluminum flagpole 100 m long is heated by the Sun from a temperature of 10°C to 20°C. Find the work done (in J) by the aluminum if the linear expansion coefficient is 24 × 10?6 (°C)?1. (The density of aluminum is 2.7 × 103 kg/m3 and 1 atm = 1.0 × 105 N/m2.)
A. 287 B. 425 C. 213 D. 710 E. 626
Inductive reactance XL is given by
A.
B.
C.
.D.
E.
The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. The velocity acquired after starting from rest is __________
Fill in the blank(s) with correct word