A "double satellite" is launched into space. It consists of a satellite of mass m and another satellite of mass 5m. The connecting mechanism of these satellites is an explosive bolt and a compressed spring, both of negligible mass. The bolt is exploded and the satellites drift apart having been pushed by the spring. When the less massive satellite has moved a distance of 2.5 m from the center of
mass of the double satellite, how far away from it is the satellite of greater mass?
a. 3.0 m
c. 0.10 m
b. 12 m
d. 0.50 m
A
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If 150 kcal of heat raises the temperature of 2.0 kg of a material by 400 F°, what is the specific heat capacity of the material?
A) 0.34 kcal/kg ? C° B) 0.75 kcal/kg ? C° C) 0.19 kcal/kg ? C° D) 1.35 kcal/kg ? C°
Using the scale in the diagram below, what is the diameter of Mercury?
a.
about 240 km
b.
about 2400 km
c.
about 24,000 km
d.
about 240,000 km
e.
about 2.4 × 106 km
The wavelength of a periodic wave is 0.800 m. If the frequency is 400 Hz, then what is the magnitude of the k vector of the wave?
A. 8.56 
B. 7.85
C. 7.02
D. 6.35
E. 5.98
The directions of the velocity and acceleration of an object which is thrown straight upward and then falls back down (ignore the effects of air resistance) have the following characteristics:
A. the velocity and acceleration are always directed downward B. the velocity is always upward but the acceleration changes direction C. the velocity is always upward and the acceleration is always downward D. the velocity changes direction but theacceleration always stays the same