How much of the night sky is north of the celestial equator?
a. Less than one-half, because of the tilt of the equator to the ecliptic plane.
b. More than one-half, because of the precession of the poles.
c. Exactly one-half.
d. All of the night sky.
C
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, 
, and 
, along with their magnitudes. Determine the magnitude and direction of the vector given by 
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What will be an ideal response?
A current I = 3 sin (400 t) amperes flows in a series RL circuit in which L = 1 mH and R = 100 ?. What is the average power loss?
a. 225 W b. 450 W c. 980 W d. 1.12 kW e. 900 W
During each cycle, a refrigerator removes 20.0 kJ of heat from the freezing compartment and ejects 24.0 kJ into a room
(a) How much work per cycle is required each cycle to run this refrigerator? (b) What is the coefficient of performance of this refrigerator?
A satellite is in a circular orbit 600 km above the Earth's surface. The acceleration of gravity is 8.21 m/s2 at this altitude. The radius of the Earth is 6 400 km. Determine the speed of the satellite, and the time to complete one orbit around the Earth