An 8000 kg satellite is launched from the surface of the earth, and injected into outer space a long distance from the earth. The initial velocity needed to launch the satellite into outer space is 
A. 8,450 m/s.
B. 9,200 m/s.
C. 11,180 m/s.
D. 18,900 m/s.
E. 25,200 m/s.
C. 11,180 m/s.
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Transverse waves are traveling on a 1.00-m-long piano string at 500 m/s. If the points of zero vibration occur at one-half wavelength (where the string is fastened at both ends), find the frequency of vibration.
A. 250 Hz B. 500 Hz C. 1000 Hz D. 2000 Hz E. 2500 Hz
The electric field in the region defined by the y-z plane and the positive x axis is given by E = ax, where a is a constant. (There is no field for negative values of x.) As x increases in magnitude, relative to V = 0 at the origin, the electric potential in the region defined above is
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