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Two stars orbit about their common center of mass. One of the stars has mass m1 and moves in a circular orbit at a distance a from the center of mass. The second star has a mass m2 = m1=2. What is the ratio of the orbital periods? What about the ratio of the speeds?
On August 19,1987, Alessandro Andrei set a world record in the shot put with a throw of 22.9 m (75 ft 2 in.). What was the maximum height the projectile reached above the ground
question1what test can be used to evaluate the mean hgba1c 1 year before vs. mean hgba1c 1 year after use of insulin
A 200 kg bucket of cement is accelerated upward by a force of 2200 N. the acceleration continues for 5 s. the power needed at the end of this period is
A snowboarder is pulled by a tow rope along a horizontal surface with a constant force of 60 N. How far must the boarder be pulled, starting from rest, so that her final kinetic energy is 500 J.
A copper (Young's mudulus 1.1 x 10^11 N/m2) cylinder and a brass (Young's mudulus 9.0 x 10^10 N/m2) cylinder are stacked end to end, Find the amount by which the length of the stack decreases
A pulley system is used to lift a piano 3.4 m. The acceleration of gravity is 9.81 m/s2 . If a force of 2315 N is applied to the rope as the rope is pulled in 17 m, what is the efficiency of the machine
Two very large charged parallel metal plates are 13cm apart and produce a uniform electric field of 2.76×10^6 N/Cbetween them. How much work has the electric field done on this proton by the time it reaches the positive plate
A bullet with mass 4.59 g is fired horizontally into a 1.958-kg block attached to a horizontal spring. Find the initial speed of the bullet-block system
What is the smallest thickness of a soap film (n = 1.33) that would appear black if illuminated with 450 -nm light? suppose there is air on both sides of the soap film.
An astronaut travels at a speed of 0.93c from the Earth to a distant star that is 4.5e+17 m away. how old is she when she arrives at the star
A sports car moving at constant speed travels 90 m in 4.9s. If it then brakes and comes to a stop in 4s, what is its acceleration? Express the answer in terms of g's, where g = 9.80 m/s2. (Take the positive direction to be direction of travel.)
When the play button is pressed, a CD accelerates uniformly from rest to 480rev/min in 2.0 revolutions. what is the torque exerted on it
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