Astronaut Sarah leaves Earth in a spaceship at a speed of 0.280c relative to Earth. Sarah's destination is a star system 12.5 light-years away
(one light-year is the distance light travels in one year). According to Sarah, how far did she travel during the trip?
A) 13.0 light-years
B) 12.5 light-years
C) 12.0 light-years
D) 11.5 light-years
E) 11.0 light-years
C
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At Titan, the lakes are made mostly of liquid
A) metallic hydrogen. B) nitrogen. C) carbon dioxide. D) methane. E) water.
A 5.0-kg object is pulled along a horizontal surface at a constant speed by a 15-N force acting 20° above the horizontal. How much work is done by this force as the object moves 6.0 m?
a. 78 J b. 82 J c. 85 J d. 74 J e. 43 J
A coulomb of charge flowing in a bulb filament powered by a 6-volt battery is provided with
A) 6 ohms. B) 6 amperes. C) 6 joules. D) 6 watts. E) 6 newtons.
Derive an equation for the net rate of radiant heat transfer from surface 1 in the system shown in the accompanying sketch. Assume that each surface is at a uniform temperature and that the geometrical shape factor F1–2 is 0.1.
GIVEN
? The system shown above
FIND
? An expression for the net rate of radiant heat transfer from surface 1 (q1)
ASSUMPTIONS
? Steady state
? A1 and A2 are gray, A0 is black
? Each surface is at a uniform temperature
? The shape factor F12 = 0.1
PROPERTIES AND CONSTANTS
