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Two 4.2 cm X 4.2cm metal plates are separated by a 0.19mm thick piece of Teflon. What is the capacitance? What is the maximum potential difference between the disks?
A square loop of dimension a x a is moving at a speed v toward a straight wire carrying a current I. What is the induced emf of the loop as a function of the distance d between the wire and the nearest side of the loop
A simple generator has a coil with area A=0.02m2, which is rotated at frequency f=60Hz (remember that angular frequency is 2*pi*f) in a B=0.5T magnetic field. How many windings (number of turns N) are needed if the generator is to develop an avera..
Two 2.0-g pith balls hang in air on essentially weightless cotton threads 50-cm long from a common point of support. Find the magnitude of the charge on each ball
A bat emits a sound whose frequency is 70.9 kHz. The speed of sound in air at 20.0 oC is 343 m/s. However, the air temperature is 40.4 oC, find the wavelength of the sound
A wagon is coasting at a speed vA along a straight and level road. When thirty-four percent of the wagon's mass is thrown off the wagon, parallel to the ground and in the forward direction, the wagon is brought to a halt. If the direction in which th..
A paddle wheel frictionally adds thermal energy to an ideal monatomic gas in a sealed, insulated container. How many moles of gas must be present in this container
You are designing an elevator for a hospital. The force exerted on a passenger by the floor of the elevator is not to exceed 1.51 times the passenger's weight. What is the maximum speed of the elevator
A thermos contains 170 cm3 of coffee at 85° C. To cool the coffee, you drop two 14-g ice cubes into the thermos. What is the final temperature of the coffee
A 60.0 kg crate is slid up an inclined ramp 2m long onto a platform 1.6 m above the floor level. A 452 N force, parallel to the ramp, is needed to slide the crate up the ramp at a constant speed. How much work is done in sliding the crate up the r..
In outer space, a baseball of mass m = 0.140 kg travels at velocity vi = (2.00 m/sec, 5.00 m/sec, 0); let the z-axis be up out of the plane of paper. calculate the average interaction force on the stick
A coil of 39 turns is in the shape of an ellipse having a major axis of 12.0 cm and a minor axis of 8.84 cm. The coil rotates at 139 rpm in a region in which the Earth's magnetic field is 64.5 ?T. What is the maximum voltage induced in the coil if th..
Consider a protostellar cloud with temperature T=15K and radius R=4000AU. At what wavelength will the cloud emit the most radiation
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