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Question: A sphere of radius 0.803 m, temperature 49.5°C, and emissivity 0.654 is located in an environment of temperature 96.6°C. At what rate does the sphere
(a) emit and
(b) absorb thermal radiation?
(c) What is the sphere's net rate of energy exchange?
A weightlifter stands up from a squatting position whileholding a heavy barbell across his shoulders. Draw a freee-body diagram for the barbells
The electric potential is given by (51V/m^7)( (x*z^6)+( x^3 * y^4 )) in the region including the point (x,y,z) = (-2, 7, -3)m exactly. Discover the y-component of electric field at that point.
The body of a 1284 kg car is supported on a frame with four springs. The spring constant of a single spring is 1.90×104 N/m. Four people riding in the car have a combined mass of 247 kg.
Molecules act as tiny springs and have vibration energy and frequency. The frequency of CO molecule is 6.42 x 1013Hz. Calculate the spring constant using the effective mass
The tension at which a fishing line snaps is commonly called the line's “strength.” What minimum strength is required for a line that is to stop a salmon of weight 83 N in 14 cm if the fish is initially drifting horizontally at 3.2 m/s? Suppose a con..
A heat engine performs 267 J of work in each cycle while also delivering 189J of heat to the cold reservoir. Find the efficiency of the heat engine. Give your answer in percent (%) with 3 significant figures.
In the afternoon, the decibel level of a busy street is95 dB with 100 cars passing at a givenpoint every minute. What is the late night decibel level
A monatomic ideal gas is held in a thermally insulated container with a volume of 0.0850m^3 . The pressure of the gas is 105kPa , and its temperature is 357K a)To what volume must the gas be compressed to increase its pressure to 150kPa b)At what ..
When you lift a bowling ball with a force of 80.2 N, the ball accelerates upward with an acceleration a. Calculate the weight of the bowling ball
You need a transformer to reduce a voltage of 150 V in the primary circuit to 25 V in the secondary circuit. What is the effective resistance of the secondary circuit
It has been suggested that rotating cylinders about 9.0 mi long and 4.6 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have
An electron of kinetic energy 1.44 keV circles in a planeperpendicular to a uniform magnetic field. The orbit radius is 22.7cm. Find (a) the electron's speed,(b) the magnetic field magnitude,(c) the circling frequency (in Hz), and(d) the period of th..
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