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A person sitting quietly in a room on a winter day may lose heat primarily by radiation from the outer surface of her clothes to the walls of the room. If the walls are at 12.2° C and the rate of radiation is 84.0 kcal/h (a typical basal metabolic rate), what is the temperature of the outer surface of the clothes, which have an emissivity of 0.800? (Assume the surface area of the person is 1 m2.)
In the x-y plane, a point of +2.6 uC is on the x-axis at (-3 cm, 0), and a second point charge of -3.4 uC is also located on the x-axis, Determine the Work required (in keV) to move an electron from Pa to Pb
A 1.70 kg block is released from rest and allowed to slide down a frictionless surface and into a spring. The far end of the spring is attached to a wall.
An ideal polarizer with its transmission axis rotated 30.5 to the vertical is placed in a beam of unpolarized light of intensity 10 W/m ^2. After passing through the polarizer, what is the intensity of the beam
During the spin cycle of your clothes washer, Find the angular displacement of the tub during a spin of 82.9 s
The mean distance between the Earth and the Sun is 1.50×1011 m. The average intensity of solar radiation incident on the upper atmosphere of the Earth is 1390 W/m2, determine the total power radiated by the Sun
The Mars rover was deployed on the surface of Mars in July 1997. At one point during its subsequent mission, How far was Mars from the from Earth at that time
A crate with mass 36.0 initially at rest on a warehouse floor is acted on by a net horizontal force of 142. Explain how far does it travel in 12s and what is its speed at that time?
Two students with vibrating 440Hz tuning forks walk away from each other with equal speeds. How fast must they walk so that they each hear the frequency of 433 from the other fork.
Two adjacent natural frequencies of an organ pipe are determined to be 299 Hz and 345 Hz. (Suppose the speed of sound is 343 m/s.)
In order to fabricate a uniform wire of resistance 2.7 ?, out of m=1 g copper which has a density of 8.92×103 kg/m3, What should be the length of the wire
The maximum distance from Earth to the Sun (at our aphelion) is 1.521 x 10^11 m and the distance of closest approach (at perihelion) is 1.471 x 10 ^11 m. Assume the Earth's orbital speed at perihelion is 3.027 x 10 ^ 4 m/s. (overlook the effect of th..
Assume that the balloon rises slowly so that the temperature inside is the same as outside. Illustrate what will happen if the balloon is made up of rigid material?
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