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What is a change in temperature of 5 K is equivalent to a change of how many degrees celsius?
A copper wire is 5.00 m long andhas a cross-sectional area of 2.0010-4 m2. what is the maximum torquethat can act on it
It has been said that George Washington, in his youth, threw a silver dollar across a river. Assuming that the river was 300 meters wide, How long was the coin in flight
A freight train has a mass of 1.8 x 107 kg. If the train can exert a constant pull of 7.8 x 105N, find how long does it take to increase the speed of the train
Two positive point charges are a fixed distance apart. the sume of their charges is Qt. what charge must each have in order to a) mazimize the electric force between them, and b) minimize it?
An iron ball of mass 500 gram at a temperature of 500 °C is cooled by placing it on a block of ice taken from the freezer. Evaluate the final temperature. The specific heat of iron is 0.107 cal/g•°C
A concave lens has a focal length of -28 cm. Find the image distance and magnification that results when an object is placed 22 cm in front of the lens
A bullet with mass 4.88 g is fired horizontally into a 2.106-kg block attached to a horizontal spring. Find the initial speed of the bullet-block system
a 30.0-kg object has a drag force with a magnitude proportional to the square of its speed. the object falls with an
A car with a mass of 1.50x10^3 kg starts from rest and accelerates to a speed of 18.0 m/s in 12s. Assume that the force of resistance remains constant at 400-N all through this time. What is the average power developed by the car's engine?
A copper vessel of mass 1000g contains 500g of water at 50C. An ice cube of mass 100g at temperature -30C is dropped into the vessel. Does the ice melt? Explain in a few words how you reached to your answer.
A rectangular block of metal of resistivity rho has dimension d x 2d x 3d. Find the maximum current density jmax from Part A
Suppose you wish to fabricate a uniform wire from 1.80 g of copper. The wire is to have a resistance of R = 0.640 ohms and all the copper is to be used. What must be the length of this wire
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