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An electric heater with the total surface area of 0.25 m2 and emissivity 0.75 is in a room where the air has a temperature of 20°C and the walls are at 10°C. When the heater consumes 500 W of electric power, its surface has a steady temperature of 120°C. Determine the temperature of the heater surface when it consumes 700 W. Solve the problem
(a) assuming negligible radiation and
(b) taking radiation into consideration. Based on your results, comment on the assumption made in part (a)
A heat engine operating between 40oC and 380oC has an efficiency 60% of that of a Carnot engine operating between the same temperatures. at what rate does it exhaust heat
question the angular momentum of a spinning wheel is 230 kg middot m2s. after application of a constant braking torque
A large wood block is being pushed across the floor with a force of 180-N to the right. The block has a mass of 145.00 kg. The frictional force is 45-N. What is the acceleration of the block.
What is the velocity of the cars after the impact and what is the loss in kinetic energy?
A uniform thin rod of length 0.778 m is hung from a horizontal nail passing through a small hole in the rod located 0.043 m from the rod\'s end
A 0.0750 kg ice cube at -30.0°C is placed in 0.597 kg of 35.0 °C water in a very well insulated container. The system comes to equilibrium after all of the ice has melted. What is the final temperature of the system?
if the incident light is unpolarized about what percentage 0 to 100 of the light intensity gets through a plane
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An electron is released from rest at the negative plate of a parallel plate capacitor. The charge per unit area on each plate is = 2.6 x 10-7 C/m2, the plates are separated by a distance of 1.4 x 10-2 m. How fast is the electron moving just before..
A doubly charged ion is accelerated to an energy of 35.0 keV by the electric field between two parallel conducting plates separated by 2.20 cm
A round object has a rotational inertia of I = ?MR2, where ? is a constant, M is its mass and R is its radius. What fraction of the total kinetic energy is rotational
The 100 kg block in the figure below takes 6.0 s to reach the floor after being released from rest. What is the mass of the block on the left
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