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On a clear day at a certain location, a 100 V/m vertical electric field exists near the Earth's surface. At the same place, the Earth's magnetic field has a magnitude of 50 x 10-6 T. Compute the energy density of the electric field and of the magnetic field respectively.
An elastic cord is 64 cm long when a weight of 56 N hangs from it and is 69 cm long when a weight of 83 N hangs from it. What is the "spring" constant of this elastic cord.
Suppose the rotational kinetic energy of a solid disc is 1000 J when the disk has an angular velocity of 3 rad/s. What is the disk's moment of inertia
If 20 grams of hot water at 80°C is poured into a cavity in a very large block of ice at 0°C, what will be the final temperature of the water in the cavity? How much ice should melt in order to cool the hot water down to this temerature.
A small fan has blades that have a radius of 0.0600 m. When the fan is turned on, the tips of the blades have a tangential acceleration of 19.6 m/s2as the fan comes up to speed
A jet flying at 125 m/s banks to make a horizontal circular turn. The radius of the turn is 3810 m, Calculate the magnitude of the necessary lifting force
A 3000 pound car crashes into a concrete jersey barrier moving 3 sections (totaling 12,000 pounds) laterally 24 inches. How fast was the car going on impact.
A car is speeding up uniformly at a rate of 0.600 m/s2 while traveling counterclockwise around a circular track of radius 495 m. find the direction of the total acceleration of the car
Sam, whose mass is 74kg , straps on his skis and starts down a 44m -high, 20? frictionless slope. Use work and energy to find Sam's speed at the bottom
How much work the power plant produces in a day. How much energy is discarded to low temperature source in a day.
A point charge q = -2.4 nC is initially at rest adjacent to the negative plate of a capacitor, What is the kinetic energy of the point charge just before it hits the positive plate
A hot-air balloon is accelerating upward under the influence of two forces, its weight and the buoyant force. What is the acceleration of the rising balloon
Avoid the weight of the bat, since it is so much less than the force of the bat. Select the direction of the incoming ball as positive direction.
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