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In a certain binary-star system, each star has the same mass as ourSun, and they revolve about their center of mass. The distance between them is the same as the distance between the Earth and theSun. What is their period of revolution in years.
Salmon, swimming up the Fraser river to their spawning grounds, leap over all sorts of obstacles. what was its speed on emerging from the water
Testing Tennis Balls Tennis balls are tested by being dropped from a height of 2.5m onto a concrete floor. The 57g ball hits the ground, compresses, How fast is the ball moving just before it hits the floor
A playground merry-go-round has radius 2.90m and moment of inertia 2500kg?m2 about a vertical axle through its center, and it turns with negligible friction. How much work did the child do on the merry-go-round
define the magnitude of the tension in the chain.
A 300-g block is dropped onto a vertical spring with spring constant k =180.0 N/m. find the speed of the block just before it hits the spring
Bruce stands on a bank beside a pond, grasps the end of a 20.0m long rope attached to a nearby tree and swings out to drop into the water. what is Bruce's speed at the botton of the swing
A moving particle encounters an external electric field that decreases its kinetic energy from 9520 eV to 7060 eV as the particle moves from postition A to position B. The electric potential at A is -55.0V, and the electric potential at B is +27.0 V...
Moving a charge from point A, where the potential is 310 , to point B, where the potential is 120 , takes 4.5×10?4 of work. What is the value of the charge
Sheena can row a boat at 2.97 mi/h in still water. She needs to cross a river that is 1.24 mi wide with a current flowing at 1.67 mi/h. How long does it take her to cross the river
Old MacDonald had a farm, and on that farm he had a gate (see below). The gate is 3m wide and 1.8m high, with hinges attached to the top and bottom. The guy wire makes an angle of 300 with the top of the gate and is tightened by a turn buckle to a..
a skier is gliding along at 4.0 ms on horizontal frictionless snow. he suddenly starts down a 14deg incline. his speed
A 12 kg mass starts from rest and slides down an inclined plane 8.0 10-1 m long in 0.9 s. What net force is acting on the mass along the incline?
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