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The average thermal conductivity of the walls (including the windows) and roof of the house depicted in the figure below is 0.480 W/m · °C, and their average thickness is 20.5 cm. The house is heated with natural gas having a heat of combustion (that is, the energy provided per cubic meter of gas burned) of 9 300 kcal/m3. To maintain an inside temperature of 21.9°C if the outside temperature is 0.0°C? Disregard radiation and the energy lost by heat through the ground.
A wheel rotating about a fixed axis through its center has a constant angular acceleration of 4 rad/s^2. In cerain 4s interval the wheel turns through an angle of 80 rads.
The left edge of the loop is on the y-axis.The x-dimension of the loop is 110 cm and the y-dimension is 40 cm. What is the magnetic flux through the loop
Parallel light from a distant object strikes the large mirror in the figure and is reflected by the small mirror that is 2.528 m from the large mirror, What is the radius of curvature of the smaller mirror
You drape a string over a pulley and hang a mass of 35kg from one end. You tie the other end to a point a distance L from the pulley so that the string is horizontal between this point and the pulley.
An experiment measures the temperature of a 270 substance while steadily supplying heat to it. The results of the experiment show. What are (a) specific heat of the liquid phase and (b) the heat of vaporization.
a hummingbird hovers 4.00cm from the surface of a decorative stainless-steel sphere that sits on a pedestal in a garden. make a sketch of the optical system
Three blocks, each of mass 14.0 kg are on a frictionless table. What is the net horizontal force on block A
Find the range of visible wavelengths of light in Plexiglas. (Assume that the range of visible wavelengths of light in air is 380 - 760 nm.)
Two, concentric, thin spherical shells of radii R1 = 31.3 cm and R2 = 39.1 cm are uniformly charged with a total charge Q1 = -56.5 ?C, What is the potential of the outer shell
A 55 kg swimmer is standing on a stationary 225 kg floating raft. The swimmer then runs off the raft horizontally with a velocity of +4.7 m/s relative to theshore. Find the recoil velocity that the raft would have if there were no friction and resist..
A "biconvex" lens is one in which both surfaces of the lens bulge outwards. What is the focal length f of this lens in air
A crate of mass 45.0 kg is being transported on the flatbed of a pickup truck. The truck accelerates forward on level ground. What is the maximum acceleration the truck can have so that the crate does not slide relative to the truck's flatbed
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