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A copper pipe with an outer radius of 0.015 m runs from an outdoor wall faucet into the interior of a house. The temperature of the faucet is 3.6° C and the temperature of the pipe, at 3.1 m from the faucet, is 28° C. In sixteen minutes, the pipe conducts a total of 253 J of heat to the outdoor faucet from the house interior. Find the inner radius of the pipe. Ignore any water inside the pipe.
The centers of a 15kg lead ball and a 50g lead ball are separated by 10cm, What is the ratio of this gravitational force to the weight of the 50g ball
An electric field is = sign(x)·(340 N/C), where sign(x) equals ?1 if x 0. A cylinder of length L = 16 cm, What is the flux through the curved surface of the cylinder
The mass of Venus is 80% that of Earth while its radius is 95% that of Earth. What is the value of the acceleration due to gravity on Venus
Suppose the skin temperature of a naked person is 35 C when the person is standing inside a room whose temperature is 22 C. The surface area of the individual is 1.5m2.
When striking, the pike, a predatory fish, can accelerate from rest to a speed of 3.8 in 0.13 How far does the pike move during this strike
The current in an electron beam in a cathode-ray tube is measured to be 70 uA. How many electrons hit the screen in 5.0s
A box is sliding up an incline that makes an angle of 13.4° with respect to the horizontal. How far does the box travel along the incline before coming to rest
You cool a 130.0g slug of red-hot iron (temperature 745 ?C) by dropping it into an insulated cup of negligible mass containing 70.0g of water at 20.0 ?C. what is the final mass of the iron and the remaining water
Of the charge Q initially on a tiny sphere, a portion q is to be transferred to a second, nearby sphere. Both spheres can be treated as particles. For what value of q/Q will the electrostatic force between the two spheres be maximized?
An electron and a positron have masses of 9.11 10-31 kg. They collide and both vanish, What is the energy of the electromagnetic radiation
A 7.80-g bullet moving at 560 m/s penetrates a tree trunk to a depth of 5.2 cm. Use work and energy considerations to find the average frictional force that stops the bullet
Models of torpedoes are sometimes tested in a horizontal pipe of flowing water, much as a wind tunnel is used to test model airplanes. With what speed must the water flow in the part of the pipe
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