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An iPod is left running inside a thin insulating case 2.5mm thick with thermal condoctivity of 0.02WK^-1 m^-1 The case is black and at 25 degrees Celsius and exchanges energy with it's surroundings, all of which are at 20 degrees Celsius, by radiation alone. What is the temperature inside the case?
A science student is riding on a flatcar of a train traveling along a straight horizontal track at a constant speed of 12.9 m/s. How high does the ball rise
The rear end of an air conditioner dumps 1.2 * 10^7 J/hr of waste heat into the air outside a building. A fan assists in the removal of this heat. With what temperature does the air emerge
A person is standing 8 m away from a speaker and experiences an intensity level consistent with the standard pain threshold. what is the power of the speaker
You are a passenger (m = 108 kg) in an airplane that is accelerating on the runway, beginning to take off. The force between your back and your seat is 405 N. how far does the plane travel as it accelerates to a takeoff speed of 125 m/s
The electric field everywhere on the surface of a thin, spherical shell of radius 0.740 m is of magnitude 905 N/C and points radically toward the center of the sphere. What is the net charge within the sphere's surface? What is the distribution of th..
A sledge loaded with bricks has a total mass of 18.1 kilogram and is pulled at constant speed by a rope inclined at 20.3 degree above the horizontal. Find how much work is done by the rope on the sledge
Two large parallel copper plates 3cm apart have a uniform electric field among them. An electron is released from the negative plate at the same time a proton is released from the positive plate. Neglecting the force on each other, discover the dis..
A current of 13.9 A flows through an electric heater operating on 120 V. What is the heater's resistance
explain the energy released in the explosion. A rock stuck in the tread of a 59.0 cm diameter bicycle wheel has a tangential speed of 3.20 m/s. When the brakes are applied, the rock's tangential deceleration is 1.20 m/s^2
a radar trap operates at a frequency of f10ghz. the speed of microwaves is v3.0108 ms. the microwave beam is aimed at a
A dockworker loading crates on a ship finds that a 24-kg crate, initially at rest on a horizontal surface, Find the coefficients of static and kinetic friction between crate and floor
water flows at a rate of 25 lmin through a horizontal 7.0-centimeter-diameter pipe under a pressure of 6.0 pa. at one
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