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A human wearing cloths has about 1.0 m^2 of exposed skin. Dry skin has an efficiency of about 20% when radiating heat. How much power does a typical human loose due to radiation (in calories/ day)?
A 1700kg car drives around a flat 200m -diameter circular track at 24m/s, What is the magnitude of the net force on the car
Assume that the net horizontal force is due to rolling friction only and take free-fall acceleration to be = 9.80 .What is the coefficient of rolling friction for the tire under low pressure.
Consider an optical gain medium that has two levels at E 1=1.50 eV and E 2=3.50 eV. What is the resonant absorption wavelength
A 2.85 kg object is held in place on an inclined plane that makes an angle of 40 degrees with the horizontal. Calculate the initial acceleration of the system
A skateboarder shoots off a ramp with a velocity of 6.80m/s, directed at an angle of 59° above the horizontal. The end of the ramp is 1.10 m above the ground.
A tennis player hits a 1.45 kg tennis ball with a racket of mass 2.5 kg. If he hits the ball with a velocity of 7.5 m/s and then stops, what impulse did he imply on the ball
A circular disk with the rectangular hole has a radius of 0.540 m and mass of 0.440 kg. It is suspended by a point on its perimeter. The moment of inertia about this point is I_p = 1.7×10-1 kgm2.
Near San Francisco, where the vertically downward component of the earth's magnetic field is 4.7 multiply.gif 10-5 T, Find the emf induced between the two sides of the car
The famous horse & cart physics scenario is explained. This scenario is used to describe why many people have a common misconception about what Newton’s 3rd Law says & does not say.
A disk is turning with uniform circular motion. A point on the rim of the disk is moving with velocity v1 = (1.5 m/s)i + (2.0 m/s)j at t1 = 3.00 ms, find the magnitude of the point's centripetal acceleration
Light from a laser beam with a wavelength of 600 nm passes through a narrow single slit and observed on a screen 1.5 m behind the slit. How wide is the slit
A continuous line of charge lies along the x axis, extending from x = +x0 to positive infinity. What is the direction of the electric field at the origin
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