An alien spaceship traveling at 0.600c toward the earth launches a landing craft with an advance guard of purchasing agents and physics teachers. the lander travels in the same direction with a speed of 0.800c relative to the mother ship. as observed on the earth, the spaceship is 0.200 ly from the earth when the lander is launched.(a) what speed do the earth observers measure for the approaching lander? (b) what is the distance to the earth at the time of lander launch, as observed by the aliens?
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All the simple machines make work easier to do by changing the or of a force. a. size; type b. work; type c. size; direction d. type; direction
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Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.
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You can melt ice by applying pressure because the solid/liquid line has a slope.
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An alien spaceship traveling at 0.600c toward the earth launches a landing craft with an advance gua...
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