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Assuming that all radiation is emitted at the wavelength of peak intensity, for a skin temperature of 34 degrees C and a surface area of 1.6 m2 , how many photons per second does the body emit? Emissivity of human skin is ? = 0.97, also the wavelength for the peak intensity at 34 degrees C is about 10 ?m .Express your answer using two significant figures.
______________photons/second
A 52 {rm kg} ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 2.50 turns each second. The distance from one hand to the other is 1.5 {rm m}. Biometric measurements indicate that each hand typi..
Two cylinders of the same material and length, are held horizontally one atop the other with space in between so they are not touching.. Viewed from the end they look like two circles on top of each other with space between(looks like a lower case..
An 84.6-kg climber is scaling the vertical wall of a mountain. His safety rope is made of nylon that, How much is the rope stretched when it breaks his fall and momentarily brings him to rest
find out the magnitude of their acceleration. If the blocks move determine the magnitude of the tension in the string. If the blocks do not move determine the sum of magnitude of the forces of friction acting on the blocks. Show all the work.
A square conducting loop has side a and carries clockwise current I as shown in the diagram. calculate the magnitude and direction of the magnetic field at the center of the square
Two point charges q1= 5.00x10^-6C and q2= -3.0x10^-6C are located on x-axis at x1= -0.4m and x2=0.6m, Find the electric field and the electric potential at the origin
Find out (a) the coefficient of kinetic friction between m2 and the incline, (b) the acceleration of each mass, and (C) the tension in the string.
What travel time is required for the landing
A container has a pressure of 4 atmospheres and is at the temperature of 200 degrees celsius, what is the average distance between molecules (assume container is a cube)
A 100-tesla magnetic field exerts a force of 20N on a 1-meter length of wire with a cross-sectional area of 0.001m^2. Calculate the current induced in the wire
Two sinusoidal waves of the same period, with amplitudes of 4.0 and 6.0 mm, travel in the same direction along a stretched string; they produce a resultant wave with an amplitude of 9.225 mm. The phase constant of the 4.0 mm wave is 0. What is the..
A 1432.0 g mass is on a horizontal surface with μk = 0.44, Calculate the distance the spring was compressed. What is the velocity of the mass as it loses contact with the spring
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