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Copperpipe with a length of 2 meters, 0.0004 meters thick and a surface area of 0.12 m^{2}, is used to heat a room via hot water running through the pipe. The water running through is 80 oC. Now we assume that the room temperature outside the pipe is a constant 15 oC . The thermal conductivity in the copper is 400 \frac{W}{m\cdot K}
The question: Calculate the heat flux from the water through the copperpipe.
Is the assumption about the room temperature being 15 oC reasonable?
A box of mass 8.0 kilogram is accelerated from rest across a floor at a rate of 3.0 m/s for 6.0 s. Estimate what is the net work done on the box
Three capacitors are connected as follows: 3.74 F capacitor and 4.52 F are connected in series, What is the capacitance of the total combination
A block of mass m lies on a horizontal table. The coefficient of static friction between the block and the table is mu_s. If the block is at rest, what is the magnitude of the force due to friction
A particular heat engine has a mechanical power output of 6.00 kW and an efficiency of 28.0%, Find the energy taken in during each cycle
An electric motor consists of a 70 turn coil 3.0 centimeter in diameter, mounted between the poles of a magnet that produces a 0.07 T field. Calculate the maximum torque developed by the motor
A drop of water on a countertop reflects light from a flower held3.30 cm directly above it. What is the focal length of the water drop
a light bulb is connected to a 120.0-v wall socket. the current in the bulb depends on the time t according to the
A proton, an electron, and an alpha particle (of charge +2e) form an equilateral triangle of side length 2.19×10-10 m. What is the electric potential energy of the three-particle system
A flywheel is rotating at 1950 rpm when a brake is applied for 3.72 s. If the magnitude of the angular acceleration is 4.81 rad/s2, obtain the final angular velocity in rpm
steam enters a turbine operaing at steady state at 700of and 450 psi and leaves as a saturated vapor at 1.2 psi. the
To move a large crate of mass 30.05 kg across a rough floor, you push on it with a force at an angle of = 22.8° below the horizontal. Compute the acceleration of the crate if the applied force is 382 N and coefficient of kinetic friction is 0.486.
A circuit containing a 5.5 H inductor has an alternating current supplied to it. If Irms is 5.1 A and Vp is 76 V, find the frequency of the signal
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