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The emissivity of non-polished gold is about 0.47. Suppose a non-polished solid golden sphere has a radius of 0.2 m and is at a temperature of 158oF. If this sphere is placed in a room in which the temperature is 68oF, determine the rate in which heat is leaving the sphere (due to radiation) into the room.
(a) 56.8 W
(b) 66.8 W
(c) 76.8 W
(d) 86.8 W
(e) 96.8 W
(f) None of the above.
sample of an ideal gas is taken through the cyclic process abca at point a, T = 385 K. How many moles of gas are in the sample, What is the net energy added to the gas during the cycle
You are an engineer in charge of designing a new generation of elevators for a prospective upgrade to the empire state building. Before the state legislature votes on funding for the project.
When the flask and mercury are warmed together to a temperature of 52.0 degrees C , a volume of 8.35cm3 of mercury overflows the flask.If the coefficient of volume expansion of mercury is 1.8 * 10^-4 /K ,
question1an elevator is being lifted up an elevator shaft at a constant speed by a steel cable. all frictional effects
A bucket of water is whirled in a vertical circle of radius 90cm,What is the least speed that will keep the water from falling out.
The Cosmoclock 21 Ferris Wheel in Yokohama City Japan hasdiameter of 100m, Find the speed of the passengers when the Ferris wheel isrotating at this rate
An airplane has a mass of 3.0*10^6 kg and air flows past the lower surface of the wing at 96 m/s, how fast must the air flow over top of the wing
Consider the reaction, (2/1)H + (9/4)Be>>>> (7/3)Li + (4/2)He How much energy is liberated? What is the threshold energy for this reaction
In a grocery store, a convex mirror with R= 4.0 m is used for surveillance. Suppose a person of height 1.7 m is 12 m from such a mirror. What is the size of the image
a segment of wire of total length 2m is formed into a circular loop having 5 turns if the wire carries a 1.2A current determined the magnitude of the magnetic field at the center of the loop
The viscous force on an oil drop is measured to be equal to 3.0X10^-13 N when the drop is falling through the air with a speed of 4.5X10^-4 m/s. If the radius of the drop is 2.5X10-6 m, what is the viscosity of air?
You push with a 20N horizontal force on a 2 kg mass resting on the horizontal surface against a horizontal friction force of 12N. What is the acceleration.
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