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A 7200 kg roller coaster train with a speed of 90.0 km/h brakes to a stop at the end of the ride. How many calories of heat are dissipated by the brakes as a result?
The spaceship Lilac, based on the Purple Planet, is 755 m long, as measured at rest. At what fraction of the speed of light is Lilac moving
A string with linear density 2g/m is stretched along the positive x-axis with tension 20 N. One end of the string, at x = 0, is tied to a hook that oscillates up and down at a frequency of 100 Hz with a maximum displacement of 1.0 mm. At t = 0s, t..
When a high speed passenger train traveling at 113 km/h rounds a bend, the engineer is shocked to see that a locomotive has improperly entered onto the track from a siding and is a distance D = 642m ahead.
A wire with a length of 1.6 m and a mass of 0.62 kg is in a region of space with a magnetic field of 0.71 T. What is the minimum current needed to levitate the wire
A 0.5 kg cart is pushed by a force of 6.2 N for a total distance of 3.2 m. what would the velocity of the cart be when the force stops
A pendulum is made with a 4.00 kg mass suspended at the end of a 75.0 cm thin rod. What is the velocity of the pendulum as it passes through the origin
A disc of mass M and radius R is rolling purely without slipping with velocity V on a flat horizontal floor. When it hits a step in the floor of height R/2.what is the velocity of the center of mass of the disc just after impact.
A guitar string is 90cm long and has a mass of 3.6g from the bridge to support post (L) is 60cm and the string is under the tension of 560. What are the frequencies of fundamental and first two overtones.
A roller coaster (482 kg) moves from A (3.63 m above the ground) to B (28.6 m above the ground). What is the change in the car's kinetic energy KEf - KEo from A to B
A source emits sound uniformly in all directions. There are no reflections of the sound. At the distance r1 from the source the sound is 3.9 dB louder than it is at a distance r2 from the source. What is the ratio r1/r2.
The supersonic aircraft Concorde has a length of 62.2m when sitting on the ground on a typical day when the temperature is 12.0 oC. What is the temperature of the Concorde's skin in flight
You know your mass is 62kg , but when you stand on a bathroom scale in an elevator, it says your mass is 90kg. What is the acceleration of the elevator
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