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A copper rod and an aluminum rod of equal diameter are joined end to end in good thermal contact. The temperature of the free end of the copper rod is held constant at 100°C, and that of the far end of the aluminum rod is held at 0°C. If the copper rod is 0.78 m long, what must be the length of the aluminum rod so that the temperature at the junction is 50°C?
Assume that the balloon rises slowly so that the temperature inside is the same as outside. Illustrate what will happen if the balloon is made up of rigid material?
A fireman, 25.6 m away from a burning building, directs a stream of water from a ground level fire hose at an angle of 39.5° above the horizontal
Explain how much time will it take for the police officer to reach the speeder, assuming that the speeder maintains a constant speed?
Steam at 100°C is added to ice at 0°C, Find the amount of ice melted and the final temperature when the mass of steam is 14.0 g and the mass of ice is 52.0 g
An inductor is connected to a source of sinusoidally varying voltage with constant amplitude and a frequency of 50.0 Hz. what will be the new rms current
The side-view mirror of an automobile has a radius of curvature of 20cm. The mirror produces a virtual image one-third the size of the object. How far is the object from mirror.
A metal sphere is filled with ammonia as part of a refrigeration device. what is the mass of the ammonia if it fills up half of the sphere
A person wearing a safety belt can withstand an acceleration of -3.0 x 10^2 m/s2. How thick must barriers be to safely stop a car that hits a barrier at 112 km/h.
A small metal particle passes downward through a fluid medium while being subjected to the attraction of a magnetic field such that its position is observed to be s = (15t3 - 3t) mm, where t is measured in seconds. Determine (a) the particle's dis..
Mike is riding his unicycle of wheel diameter 20 in. Mike rides for 30 m with an initial angular velocity of 0.75 rad/s, What is the unicycle's linear velocity at 30 m?
A 96N grocery cart is pushed 10m along an aisle by a shopper who exerts a constant horizontal force of 40-N. If all frictional forces are neglected and cart starts from rest, what is the grocery cart's final speed.
A vertical straight wire carrying an upward26-A current exerts an attractive force per unit length of 7.3×10?4N/m, What is the direction of the current in the second wire?
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