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. 
D.
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Climate models support the claim that human activity is causing the currently observed global warming because
A) the models can perfectly predict all aspects of today's climate. B) climate models that include contributions by human activity agree much better with actual data than models that consider only natural factors. C) the models are very sophisticated, with thousands of equations, and this gives scientists confidence that the models must be correct. D) the models predict that warming will continue in the future.
If - = 0, then the vectors and have equal magnitudes and are directed in the same direction
Indicate whether the statement is true or false
If a floating log is seen to bob up and down 15. times in a minute as waves pass by you, what is the frequency and period of the wave?
What will be an ideal response?
To calculate the masses of stars in a binary system, we must measure their
A) spectral types and distance from Earth. B) absolute magnitudes and luminosities. C) luminosities and distance from Earth. D) orbital period and average orbital distance.