The intensity of sunlight falling on the earth is about 1.4 kW/m2 (before any gets absorbed by our atmosphere). At what rate does the sun emit light energy?
(The earth-sun distance = 1.5 × 108 km and the earth's radius = 6.4 × 103 km.)
A) 4.0 × 1026 W
B) 3.2 × 1022 W
C) 7.2 × 1014 W
D) 7.6 × 108 W
Answer: A
You might also like to view...
A baseball is hit at ground level. The ball is observed to reach its maximum height above ground level 3.0 s after being hit. And 2.5 s after reaching this maximum height, the ball is observed to barely clear a fence that is 97.5 m from where it was hit. How high is the fence?
a. 8.2 m b. 15.8 m c. 13.5 m d. 11.0 m e. 4.9 m
Angular Momentum: A 40.0-kg child running at 3.00 m/s suddenly jumps onto a stationary playground merry-go-round at a distance 1.50 m from the axis of rotation of the merry-go-round. The child is traveling tangential to the edge of the merry-go-round just before jumping on. The moment of inertia about its axis of rotation is 600 kg ? m2 and very little friction at its rotation axis. What is the angular speed of the merry-go-round just after the child has jumped onto it?
A. 0.788 rad/s B. 0.261 rad/s C. 6.28 rev/s D. 2.00 rad/s E. 3.14 rev/s
The Moon's spin-orbit resonance shows it is ________ with the Earth
Fill in the blank(s) with correct word
What magnitude net force is required to accelerate a 1200-kg car uniformly from 0 m/s to 27.0 m/s in 10.0 s?
A) 1620 N B) 11800 N C) 4360 N D) 444 N E) 3240 N