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Assume that the earth has an average surface temperature of29°C and is a perfect emitter of radiation (e = 1). Find the energy per second per square meter that the earth radiatesinto space.
Most materials will expand when the temperature is increased. The change in size will depend on several factors, including the original size, What is the fractional change in length
A performer seated on a trapeze is swinging back and forth with a period of 9.28 s. what will be the new period of the system
An electric current of 1 A flows through a 20 ? resistor which is kept at a constant temperature of 10° C by flowing water. In 1 s what is the entropy change of the resistor and the entropy change of the water?
Three charged particles are placed at each of three corners of an equilateral triangle whose sides are of length 2.8 . Two of the particles have a negative charge: = -6.7 and = -13.4 . The remaining particle has a positive charge, = 8.0 . What is ..
You are in a radar station on the coast. You are monitoring the motion of two ships. The Pequod is 4.00 km away, What is the speed of the Jeroboam seen by Captain Ahab
One mole of an ideal gas expands from 5 to 1 atm at 25 oC. Calculate W (a) if the gas expands isothermally, (b) and if the gas expands adiabatically.
A three-phase synchronous generator is connected to a step-up transformer T1, which is connected to a 60km long transmission line. As the far end of the line, a step-down transformer bank T2 is connected. The secondary of T2 supplies two loads L..
A comet moves about the Sun in an elliptical orbit, with its closest approach to the Sun being about 0.570 AU and its greatest distance from the sun being 41.5 AU (1 AU = the Earth-Sun distance). What is its speed when it is farthest from the Sun
The hammer throw is a track-and-field event in which a 7.30-kg ball (the hammer) is whirled around in a circle several times and released. It then moves upward on the familiar curved path of projectile motion and eventually returns to the ground s..
Suppose a modern power plant has a 1.00-GW electric power output at 500 V. It is stepped up to a transmission voltage of 750 kV in a series of five identical transformers. What is the current in the high voltage delivery lines
A 4.85 mol sample of a diatomic ideal gas (gamma = 1.4) expands slowly and adiabatically from a pressure of 4.05 atm and a volume of 13.5 L to a final volume of 34.5 L.
A bullet of mass m = 28 g is fired into a wooden block of mass M = 4.1 kg as shown in the figure below. The block is attached to a string of length 1.5 m. what was the initial speed of the bullet
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