From observations made of Uranus, scientists have discovered that belt-zone circulation is dominated by what planetary characteristic?
a. rotation
b. orbital period
c. direction of sunlight
d. atmospheric elements
e. interior heating
a
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It is possible to hear an approaching train before you can see it by listening to the sound wave through the track. If the elastic modulus is 2.0 × 10^11 N/m2 and the density of steel is 7.8 × 10^3 kg/m3, approximately how many times faster is the speed of sound in the track than in air? (vair ? 340 m/s.)
a. 20 b. 5 c. 10 d. 15 e. 25
When we look at the Andromeda Galaxy tonight though our telescope, we see this galaxy
a) as it was just after the big bang b) as it was 3.2 years ago as it was when the light left this galaxy c) as it is now because light travel instantaneously d) as it was 2.5 million years ago when the light that we are seeing today left that galaxy
A car travels along the perimeter of a vertical circle (radius = 0.25 km) at a constant speed of 30 m/s. What is the magnitude of the resultant force on the 60-kg driver of the car at the lowest point on this circular path?
a. 0.37 kN b. 0.80 kN c. 0.22 kN d. 0.59 kN e. 0.45 kN
An 8000 kg satellite is launched from the surface of the earth, and injected into a circular orbit at an altitude of 100 km above the surface of the earth. The kinetic energy of the satellite in the circular orbit is 
A. 
B. 
C. 
D. 
E. 