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Consider a solid sphere of radius 4 cm, at a temperature of 19 degrees Celsius. Suppose the sphere is completely enclosed in vacuum by a vessel whose walls are kept at -46 degrees Celsius. What is the net flow rate of energy (in watts) from the sphere to the vessel? For simplicity, assume the sphere and the vessel are both ideal blackbody radiators, with emissivity e = 1.
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
a disc of radiusnbsp10 cmnbspcarries a uniform surface charge density ofnbsp3.2 nc.m-2. the electric field on the axis
the far point of an eye is 190 cm. a corrective lens is to be used to allow this eye to focus clearly on objects a
The box of a well-known breakfast cereal states that one ounce of the cereal contains 107 Calories (1 food Calorie = 4186 J). what is the weight of the heaviest barbell
One lens of a nearsighted person's eyeglasses has a focal length of -21.7 cm, and the lens is 1.70 cm from the eye. what should be the focal length of the corresponding contact lens
A square steel plate is 0.2 m on a side and 4 mm thick. Find the displacement of the plate
a dynamite blast at a quarry launches a rock straight upward and 2.3 s later it is rising at a rate of 14 ms. assuming
A spherical mirror is to be used to fom an image 5 times as tall as the object on a screen positioned 1 meter from the mirror. Find the type of mirror
A mass of 3.90 kg is suspended from a 1.55 m long string. It revolves in a horizontal circle. Calculate the angle between the string and the vertical
on a spacecraft two engines fire for a time of 479 s. one gives the craft an acceleration in the x direction of ax
A express train travels along a straight line between two stations, A and D. Stations B and C are spaced evenly along the line between A and D. The engineer leaves A and accelerates at a constant rate until he passes station B
A pair of flat mirrors meet to form a right angle. A beam of light is incident on one of them at a point 11.5 cm from their point of intersection, find what is the angle of incidence at the first mirror
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