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When constructing a roller coaster, the designer wishes the riders to experience weightlessness as they round the top of the hill. Find how fast the car must be going if the radius of curvature at the hill top is 20 meter.
In the "before" part of the figure below, car A (mass 1000 kg) is stopped at a traffic light when it is rear-ended by car B (mass 1600 kg). Both cars then slide with locked wheels until the frictional force from the slick road (with a low µk of 0...
A bluray disc is 12cm in diameter. When you put it into the player it takes 30 seconds for the disc to accelerate to its playing speed; 1500 revolutions per minute. find number of revolutions the disc makes
A stone is dropped at t = 0. A second stone, with 6 times the mass of the first, is dropped from the same point at t = 56 ms. How fast is the center of mass of the two-stone system
Two small beads having positive charges 18q and q are fixed at the opposite ends of a horizontal insulating rod, extending from the origin (the location of the larger charge) to the point x = d. As, a third small charged bead is free to slide on t..
a concrete slab is 11.4 cm thick and has an area of 4.3 m2. electric heating coils are installed under the slab to melt
It takes a runner 3 h, 9 min, 4 s to run a marathon. If the distance of a marathon is 42.2 km, what is the average speed of the runner
A carpenter is driving a nail into a board. The 1.25 kg hammer moves at 8.85 m/s when it strikes the nail. find the increase in temperature of the nail after 3 blows from the hammer
q1. a stone has a mass of 5 x 10-4 kg and is wedged into the tread of an automobile tire as drawing shows. the
A particle of charge +14 µC and mass 3.54 10-5 kg is released from rest in a region where there is a constant electric field of +490 N/C
A Carnot engine operates between the temperatures 300 K and 350 K. Determine how much heat is discarded for the engine to produce 2700 Joule of work
During a fun run a girl runs for 12 s moving 2.7 m/s. She then accelerates at 0.5 m/s^2 over the next 25 m. she then runs at her new speed for 10s. What distance did she cover during the entire period?
a 3 kg cylinder falls vertically from rest in a very tall, evacuated tube 20 m above the surface of the earth. what is the kinetic energy just before it hits the earth
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