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A student wants to lose some weight. He knows that rigorous aerobic activity uses about 700 kcal/h (2900 kJ/h) and that it takes about 2000 kcal per day (8400 kJ) just to support necessary biological functions, including keeping the body warm. He decides to burn calories faster simply by sitting naked in a 21° C room and letting his body radiate calories away. His body has a surface area of about 1.8 m2 and his skin temperature is 34.3° C. Assuming an emissivity of 1.0, at what rate will this student "burn" calories? in kcal/hr please show all work.
The crest of the second hill is circular, with a radius of r = 35m. Avoid friction and air resistance. What must be the height h of the first hill so that skier just loses contact with the snow at the crest of the second hill.
A 3.3kg block sits on a table. A 3.0kg bullet is fired horzontally at a speed of 520 m/s, find the speed of the block immediatley after the bullet exits
Blocks with masses of 4.0, 8.0, and 9.0 are lined up in a row on a frictionless table. All three are pushed forward by a 16 force applied to the 4.0 block. How much force does the 8.0 block exert on the 8.0 block.
A ball is kicked with initial velocity of 14.9 m/s in the horizontal direction and 15.7 in the vertical direction. At what speed does the ball hit the ground
A converging lens with a focal length f1 = 4cm is placed to the left of a second identical lens f2. What is the separation distance between the two lenses
A gold wire 5.72 long and of diameter 0.850 carries a current of 1.19. Find the resistance of this wire
A charge of 910 C was passed through a wire in 3.10min. What was the average electric current during that interval
A flat observation screen is placed at a distance of 4.5 m from a pair of slits. The separation on the screen between the central bright fringe and the first-order bright fringe is 0.043 m. Determine the slit separation
An extension cord made of two wires of diameter 0.129 cm (no. 16 copper wire), how much power is dissipated in the cord
A standing wave is oscillating at 140 Hz on a string, as shown in the figure. What is the speed of traveling waves on this string
A uniform magnetic field passes through a horizontal circular wire loop at an angle 15.1° from the normal to plane of the loop. Find the magnetic flux through the loop
what force is required to slow a 1250kg car traveling 115km/h to 30km/h within 3.50 s? how far does the car travel during its deceleration
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