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The inside of a room is to be maintained at 20 degrees celsius while the outside temperature is -10 degrees celsius. Heat loss occurs from each of the 4 walls of the room to the outside. Each wall has an area of 2.5 m^2 and is made of a 1cm thick material that has a thermal conductivity of 0.2 W/m K. What should be the thickness of an isulator(of thermal conductivity 0.05 W/m K) that has to be added to the outside of each of the walls to maintain the insode of the room at 20 degrees celsius using a 500 W heater? Assume that the convective heat transfer coefficient between ambient air outside and the outide wall(with insulation) is 750 W/m^2 K.
A particle moves in a one-dimensional potential given by V(x) = Vo(e^-ax + bx),(V(x) is potential not velocity), Sketch the potential and the force as functions of x
A 0.11-kg balloon is filled with helium (density = 0.179 kg/m3). If the balloon is a sphere with a radius of 4.2 m, what is the maximum weight it can lift
In a cathode-ray tube electrons are projected horizontally at 1.5x10^6m/s and travel a horizontal distance 11.0cm across the tube. How long are the electrons in flight? Find the vertical distance the electrons fall (under the influence of gravity) du..
A ball with mass 2.5 kg is moving in outer space with a velocity of 6.0 m/s horizontally, Find the final velocity of the pair
A fish swimming in a horizontal plane has velocity i = (4.00 + 1.00 ) m/s at a point in the ocean where the position relative to a certain rock is i = (14.0 ? 4.20 ) m. What are the components of the acceleration of the fish
Two vectors of magnitude 22.6 N and 24.5 N act at right angles to each other. What is the magnitude of their resultant vector
What focal length objective lens is required for a 3 meter length telescope which uses a 4 Power eyepiece? Is the final image real
A disk-shaped merry-go-round of radius 2.78mand mass 160kg rotates freely with an angular speed of 0.696rev/s. What is initial and final kinetic energy
A boat that travels at the speed of 6.75 m/s in still water is to go directly across a river and back. How long does it take to make the round trip
A uniform, cylindrical pulley of mass M=12.2 kg and radius R=0.272 m rotates freely about a fixed horizontal axis. What is the mass of the block
A light meter stick is balanced at the 60 cm mark with a 200-g mass is hung from the 90 cm mark and a 100-g mass is hung from the 10 cm mark, Find the mass (in g) of the ruler
A surface whose work function is 2.8 eV is illuminated by a light whose wavelength is 116 nm. What is the maximum velocity of a photoelectron emitted from the surface? The speed of light is 3 × 10^8 m/s and Planck’s constant is 6.63 × 10?34 J · s. An..
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