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A student drops two metallic objects into a 32 g steel container holding 169 g of water at 29C. One object is a 486 g cube of copper that is initially at 58C, and the other is a chunk of aluminum that is initially at 6.9C. To the student’s surprise, the water reaches a final temperature of 29C, precisely where it started.
What was themass of the aluminumchunk?
Assume the specific heat of aluminum is 900 J/kg* C and of copper 387 J/kg* C.
Supposing that the Earth's magnetic field at this location is 2.0*10^-5 T, due north, what will be the induced emf in the wire 2.0s after it is released (the wire is in free fall, you can calculate its velocity after 2.0s)
A speeder is pulling directly away and increasing his distance from a police car that is moving at 23.0 m/s with respect to the ground. Calculate the speeder's speed with respect to the ground.
A 1.86- sound wave travels through the pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward the sound receiver as heart beats. The reflected sound is after that mixed with the transmi..
In an amusement park rocket ride cars are suspended from 4.25 m cables attached to rotating arms at a distance of 6.00m from the axis of rotation. What is the angular speed of rotation
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An ideal transformer steps down 120V to 12V and the 2630 turn secondary supplies 12 A. What is the ratio of output power to input power
A merry-go-round is spinning and has a period of 7.25 s. A boy jumps off in a direction parallel to the radius, what is the new period of the merry-go-round
An undiscovered planet, many lightyears from Earth, has one moon in a periodic orbit. This moon takes 21.0 days on average to complete one nearly circular revolution around the unnamed planet.
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