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A person is standing outdoors in the shade where the temperature is 17 °C.
(a) What is the radiant energy absorbed per second by his head when it is covered with hair? The surface area of the hair (assumed to be flat) is 140 cm2 and its emissivity is 0.87.
(b) What would be the radiant energy absorbed per second by the same person if he were bald and the emissivity of his head were 0.68?
A shopper in a supermarket pushes a loaded 28 kg cart with a horizontal force of 12N. How far will the cart move in 3.5s, starting from rest.
a 6.0 uc positive charge is located at the origin and a 4.0 uc positive charge is located at x 0.0 m y 1.0 m. find
A ball rolls off the edge of a table with a horizontal velocity v m/s. What is the initial speed of the ball
question when a 9.80 kg mass is placed on top of a vertical spring the spring compresses 4.00 cm. what would the
A person with mass mp = 75.0 kg stands on a spinning platform disk with a radius of R = 1.77 m and mass md = 188.0 kg. The disk is initially spinning at ? = 1.5 rad/s. The person then walks 2/3 of the way toward the center of the disk (ending 0.59..
A battery having an emf of 9.80 V delivers 109 mA when connected to a 60.0 load. Determine the internal resistance of the battery
A Hollywood daredevil plans to jump the canyon shown in the figure on a motorcycle, what is the correct angle for his launch ramp (deg) and What is his correct launch speed
an open boxcar rolls at a constant speed of 6 ftsec down a 1.5 slope. then grain is poured in vertically downward at a
A textbook of mass 2.05 kg rests on a frictionless, horizontal surface. What is the tension in the part of the cord attached to the book
If the magnetic field of the wire is 2.0×10?4 and the electron moves at 1.0×107 , what is the magnitude of the force exerted on the electron
The two plates of a parallel plate capacitor are 5.8 mm apart and have a potential difference between the of 220 V. Find the magnitude of the electric field between the plates
During an initial stage of construction, the beam is not to be bolted to the wall, but to be held in place solely by friction. What is the least coefficient of friction between the beam and the wall for the beam to remain in static equilibrium.
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