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A steel cylinder with a radius of 5cm and a length of 4cm is placed in end to end thermal contact with a copper cylinder of the same dimensions. If the free ends of the two cylinders are maintained at constant temperatures of 95C(steel) and 15C (copper), how much heat will flow through the cylinders in 10 minutes?
Two overlapping beams of light of different wavelength ?a = 840 nm and ?b = 460 nm co-propagate through air, What is the angle between the beams travelling through the material
1. you are hired by an industry that owns a building with a floor area of 6 m by 10 m and a ceiling height of 4 m. the
A 0.30 kg mass is suspended on a string. In equilibrium the mass stretches the spring 2.0 cm downward. Calculate the total energy of the system
A horse is pulling a buggy. the total force by the horse is 475N applied horizontally. What is the force of friction on the driver and buggy
A block is suspended from a string connected to a balance. While in air, the scale reads 350 N. What is the buoyancy force on the object when immersed in water
A converging lens and a diverging lens, separated by a distance of 30.0 cm, are used in combination. What is the focal length of the diverging lens
A high-speed flywheel in a motor is spinning at 450 rpm when a power failure suddenly occurs. The flywheel has mass 37.0kg and diameter 71 cm. The power is off for 27.0s and during this time the flywheel slows due to friction in its axle bearings...
Two particles each have a mass of 5.80 10-3 kg. One has a charge of +5.0 10-6 C, and the other has a charge of -5.0 10-6 C. They are initially held at rest at a distance of 0.70 m apart. Both are then released and accelerate toward each other. How fa..
Suppose a radio station emits EM waves uniformly in all directions. What is the maximum power level of this radio station so as to avoid electrical breakdown of air at a distance of 2.0m from the antenna
A motor has an internal resistance of 12 ohms. When running, the motor has a back emf of 30 V and draws a current of 4.0 A. What is the supply voltage in this case
You and your friend throw balloons ?lled with water from the roof of a several story apartment house. You simply drop a balloon from rest. How high is the apartment house
A vertical solid steel post 24.0cm in diameter and 2.50m long is required to support a load of 8100 kg. You may ignore the weight of the post. What is the strain in the post when the load is applied
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