An observer in the Northern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead
A
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An airplane in a wide sweeping "outside" loop can create 0-g inside the aircraft cabin. What must be the radius of curvature of the flight path for an aircraft moving at 180 m/s to create a condition of "weightlessness" inside the aircraft?
a. 1150 m c. 2300 m b. 1800 m d. 3300 m
If two objects each carrying a charge of 1 coulomb were placed 1 meter apart, how much force would they exert on each other?
A) 9 N B) 106 N C) 9 x 109 N D) zero E) 1 N
The intensity of radiation reaching the earth from the sun is 1 350 W/m2 . The earth's radius is 6.4 × 10^6 m. How big a force does this radiation exert on the earth? (Assume it is all absorbed.)
a. 5.8 × 10^8 N b. 1.2 × 10^9 N c. 2.3 × 10^9 N d. 4.6 × 10^9 N e. 1.7 × 10^17 N
If M = 6.0 kg, what is the tension in string 1?
A. 39 N B. 34 N C. 29 N D. 44 N E. 51 N