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Seals may cool themselves by using thermal windows, patches on their bodies with much higher than average surface temperature. Suppose a seal has a 0.030m^2 thermal window at a temperature of 30 degrees Celsius. If the seal's surroundings are a frosty -19degrees celsius, what is the net rate of energy loss by radiation? Assume an emissivity equal to that of a human.
q1. give some examples of the applications of lasers in the medical field industry and in commerce?q2. describe total
Unpolarized light with intensity I0 is incident on two polarizing filters. The axis of the first filter makes an angle of ? = 60 ? with the vertical, What is the intensity of the light after it has passed through the second filter
A candle is placed 17.0 cm in front of a convex mirror. When the convex mirror is replaced with a plane mirror, Find the focal length of the convex mirror
A step-down transformer has a turns ratio of 1:10, and its primary is connected across the terminals of a standard 120-V wall socket. What power P is dissipated in the resistor
A boy of mass 60.0 kg is rescued from a hotel fire by leaping into a firefighters' net. The window from which he leapt was 8.0 m above the net. What is the average force on the net due to the boy during the interval
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 ..
A 2.4-kg block is dropped from a height of 5.0 m onto a spring of spring constant 3955 N/m. When the block is momentarily at rest, the spring has compressed by 25 cm.
An electron is released a short distance above Earth's surface, the first electron just great enough to cancel the gravitational force on it, How far below the first electron is the second
Starting from rest, a 92-kg firefighter slides down a fire pole. How far did he slide down the pole
A binary star system has two stars, each with the same mass as our sun, separated by 1.20×1012m. What is the comet's speed at the midpoint
A good baseball pitcher can throw a baseball toward homeplate at 85mi/h with a spin of 1800rev/min. How many revolutions does the baseball make
A place-kicker must kick a football from a point 36.0 m (about 40 yards) from the goal. By how much does the ball clear or fall short (vertically) of clearing the crossbar
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