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The brick wall (of thermal conductivity 1.1 W/m•oC) of a building has dimensions of 2.8 meter by 15 meter and is 9 centimeter thick. Determine how much heat flows through the wall in a 5.8 hour period when the average inside and outside temperatures are, correspondingly, 10oC and 2oC?
Answer in units of MJ
Suppose a car battery provides 14 Volts when not in use. When the starter cranks, it draws 100 Amps, Find the Thevenins equivalent circuit for this battery
A physics student is standing on an initially motionless,frictionless turntable with rotational inertia 0.31kg·m2. He's holding a wheel of rotational inertia0.22 kg·m2 spining at 125 rpm about a vertical axis, as we showed in Fig.11.8.
A 33.0-mH inductor has a reactance of 2.10 k?. What is the new reactance of the capacitor
A 1100kg automobile travels at 80km/h. What net work would be required to bring it to a stop
A ship sails from seawater (specific gravity 1.025) into freshwater and therefore sinks slightly. find the combined mass of the ship and cargo before it was unloaded
A metal strip 2.0 cm wide and 0.1 cm thick carries a current of 24 A in a uniform magnetic field of 2.4 T, as shown below. The Hall voltage is measured to be 4.27 V. Calculate the drift velocity of the electrons in the strip
A water tower is a familiar sight in many towns. The purpose of such a tower is to provide storage capacity and to provide enough pressure in the pipes that deliver the water to customers. The drawing shows a spherical reservoir that contains6.61 x 1..
A horizontal circular platform rotates counterclockwise about its axis at the rate of 0.843 rad/s. You, with a mass of 71.9 kg, estimate the total angular momentum of the system
In the isothermal compression of an ideal gas, the volume occupied by the gas is decreasing, but the temperature of the gas remains constant. In order for this to happen, A. heat must enter the gas. B. heat must exit the gas. C. no heat exchange shou..
A 4.94-g bullet is shot through a 0.99-kg wood block suspended on a string 2.00 m long. The center of mass of the blockrises a distance of 0.50 cm. Find the speed of the bullet as it emerges from the block if its initial speed is 393 m/s.
Two balls of equal mass collide and travel off in different directions as shown. Assume the red (inicident) ball leaves at an angle of 60ofrom it's initial direction of motion and the green (originally stationary) ball leaves at an angle of 30o. (Not..
Light from a laser strikes a diffraction grating that has 5 300 grooves per centimeter. The central and first-order principal maxima are separated by 0.488 m on a wall 1.76 m from the grating.
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