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In an electrically heated home, the temperature of the ground in contact with a concrete basement wall is 13.6 oC. The temperature at the inside surface of the wall is 19.0 oC. The wall is 0.14 m thick and has an area of 8.5 m2. Assume that one kilowatt hour of electrical energy costs $0.10. How many hours are required for one dollar's worth of energy to be conducted through the wall?
A certain camera lens has a focal length of 147 mm. Its position can be adjusted to produce images, Over what range of object distances is the lens useful
A network of capacitors is mostly inside a sealed box, buit one capacitor Cx is sticking out, as shown in the figure. When you connect a multimeter across points a and b, it reads 27.0 uF. What is Cx?
an object with a mass 2.70kg is executing simple harmonic motion, attached to a spring with spring constant k=280 N/m. What is the frequency of oscillation of the object
A 10.8 kg object oscillates at the end of a vertical spring that has a spring constant of 2.05 104 N/m. By what percentage does the amplitude of the oscillation decrease in each cycle
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.60 104 m/s, and the radius of the orbit is 5.00 106 m. What is the orbital speed of the second satellite
A beam of X-rays having a wavelength of .09nm impinges on an unknown crystal. What is the spacing between the atomic plates
If the deceleration of the truck is constant, what is the minimum coefficient of friction between the crate and the truck that is required to keep the crate.
An automobile on a flat track travels at 28 m/s around a curve with a 56 meter radius. Find the automobile's centripetal acceleration
two 18.5 kg ice sleds that are placed a short distance apart, one directly behind the other. What are the final speeds of the two sleds
A diver 48 m deep in 18°C fresh water exhales a 0.6 cm diameter bubble. What is the bubble's diameter just as it reaches the surface of the lake
q1. an airplane is flying with a velocity of 83.0 at an angle of 22.0 above the horizontal. when the plane is a
An air source heat pump with a heating cop of 4 is used to heat a house. The input rating of the heat pump is 3.3 horsepower. how much electrical energy does it use per month
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