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A concrete wall of a cold storage room measures 3.0 m high, 5.0 m wide, and 20 cm thick. The room temperature is maintained at -10°C and the outside temperature is 20°C The inside wall is to be covered by a layer of wood in order to reduce the rate of heat loss through the wall BY 90 percent. The thermal conductivities of concrete and wood are 0.80 W/m·K and 0.040 W/m·K, respectively. What is the temperature difference across the layer of wood?
3 an observer in spaceship B obverses another spaceship A travelling with a velocity of 0.40 c relative to him. Both are moving in the +x-direction, how much time it takes the missile to reach you
Considering just the Sun and Jupiter, determine the radius of the circular orbit the Sun makes about the Sun-Jupiter center of mass
The same voltage is applied between the plates of two different capacitors. When used with capacitor A, this voltage causes the capacitor to store 13, Determine qB
A person of mass 75 kg stands at the center of a rotatingmerry-go-round platform of radius 2.5m and moment of inertia 1100 kgm2. Calculate the rotational kinetic energy of the system
A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. He notes that it takes the wave 0.730 s to reach the opposite tower, 20.0 m away. If a 1 meter length of ..
Your personal stereo is in a dead spot caused by direct reception from an FM radio station at 91.9MHz interfering with the signal reflecting off a wall behind you.How much farther from the wall should you move so that the interference is fully constr..
X rays of wavelength 0.0196 nm are directed in the positive direction of an x axis onto a target containing loosely bound electrons. determine the corresponding change in photon energy
a potential difference is applied between the electrodes in a gas discharge tube. in 2.0 s 3.1 x 1016 electrons and 1.1
en boxes, each 21.0 cm high and weighing 235 N, initially are all side by side on the floor. Compute the power necessary to stack the boxes
A suitcase (mass m = 18 kg) is resting on the floor of an elevator. What pressure (in excess of atmospheric pressure) is applied to the floor beneath the suitcase
A car started frm rest and accelerated for 5s at 6.00m/s2.Then it stayed at a constant speed for 20 s. It next slowed down at 3m/s2 until it came to a stop? how far did it travel during the first 5 s.
A 9kg block is connected by a string over a light pulley to a 5kg block that is sliding over a flat table (i.e. the 9kg is pulling the 5kg off the table). If Co-efficient of kinetic friction is 0.200, find the tension in the string.
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