Two spaceships approach each other along a straight line at a constant relative velocity of 0.9880c as measured by the captain of one of the ships. An observer on Earth is able to measure the speed of only one of the ships as 0.9000c
From the point of view of the observer on Earth, what is the speed of the other ship in terms of the speed of light?
0.794c
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Which spacecraft launched a probe that smashed into comet Tempel 1?
A. NEAR B. Deep Impact C. Hayabusa D. Stardust
A 2.00 m by 3.00 m plate of aluminum has a mass of 324 kg. What is the thickness of the plate? (The density of aluminum is 2.70 × 10^3 kg/m3.)
How many "generations" of strongly interacting particles are there?
A) three B) four C) two D) six E) an infinite number
A 3.00-m-long ladder, weighing 200 N, rests against a smooth vertical wall with its base on a horizontal rough floor, a distance of 1.00 m away from the wall
If the center of mass of the ladder is 1.20 m from its base, what frictional force must the floor exert on the base of the ladder in order for the ladder to be in static equilibrium? A) 93.3 N B) 130 N C) 28.3 N D) 102 N E) 150 N