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A steel cylinder of radius 5.0cm and length 5.0cm 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 85 C (steel) and 23 C (copper), how much heat will flow through the cylinders in 20min ? Assume ksteel=46J/(m*s*C and . kcopper=390J/(m*s*C)
The magnetic coils of a tokamak fusion reactor are in the shape of a toroid having an inner radius of 0.7 m and an outer radius of 1.3m. Find the magnitude of the magnetic field inside the toroid
An air-traffic controller observes two aircraft on his radar screen. The first is at altitude 750 m, horizontal distance 19.8 km, What is the distance between the two aircraft
A block is pushed up a 20 degree friction-less incline with an initial speed 12.0 m/s. How high up the plane does the block slide before coming to rest
A rotating flywheel can be used to store energy. if it is required to store 1.00 x 10^6 J of energy when rotating at 200 rad/s, what is the moment of inertia of the wheel
A charge of q = +10-7 C is uniformly distributed on a spherical shell of radius 12 cm. What is the electric potential at the center of the shell
A car accelerates uniformly from rest to a speed of 64.7 km/h (18.0 m/s) in 10 s. Find the distance the car travels during this time
Water is boiling in a pan at sea level on a stove. During 10 minutes of boiling, it is observed that 200 grams of water has evaporated. Then the rate of heat transfer to the water is what is kJ/min?
At full power, how long would it take for car to accelerate from 0 to 56 mph? Neglect friction and air resistance.
The threshold intensity for a human eye to sense the presence of light is 50 photons falling on the retina within a period of 0.1 s. Estimate how far away the star can be away
A block of aluminum weight 140.0 g is cooled from 98.4 degrees celcius to 62.2 degrees celcius with the release of 1080 J of heat. From this data calculate the specific heat of aluminum
A wildland fire sawyer is cutting a snag of length L = 23.5m and mass m = 880kg. He puts a Humboldt face cut on the snag which has a negligible amount of taper, what is the final angular velocity of the snag
Two waves are traveling in the same direction along a stretched string. The waves are 45.0° out of phase. Find the amplitude of the resultant wave
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