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Cora lies in a tanning bed getting a tan. Suppose that AS = 0.79 m2 of her skin is exposed to the light from the ultraviolet (UV) lamps. The UV lamps produce light with an average energy density of uT = 5 x 10-6 J / m3. She lies in the bed for tT = 30 minutes. Randomized Variables AS = 0.79 m2 UT = 5 x 10-6 J / m3 tT = 30 minutes Part (a) compute the average intensity ST in W / m2 of the UV light. Part (b) supposes that Cora’s skin absorbs 100% of the energy of the UV light. Calculate how much energy UT in J her skin absorbs during time she lies in the bed. Part (c) computes the rms electric field ET in N/C of UV light. Part (d) computes the rms magnetic field BT in T of the UV light. An antenna with power P = 1.4 x 103 W is radiating spherical electromagnetic waves. Consider a place which is d = 190 m away from the antenna. Randomized Variables P = 1.4 x 103 W d = 190 m 1. Express I in terms of the electric field magnitude Emax, and the speed of light c. 2. Find Emax2 in terms of P, d, and c. 3. Solve for numerical value of Emax in V/m.
An artillery shell is fired with an initial velocity of 300 m/s at 51.0° above the horizontal. To clear an avalanche, it explodes on a mountainside 47.0 s after firing. Illustrate what are the x and y coordinates of the shell where it explodes, re..
Estimate the thickness of the Earth's atmosphere. From your chemistry class, you know that the most common speed of a nitrogen molecule is 640 m/s. What is the altitude
The box has a mass of 31.0 kg, and the coefficient of kinetic friction between the box and floor is 0.530. The acceleration of gravity is 9.81 m/s2. Illustrate what is the acceleration of the box?
A rocket is launched from the origin with an acceleration of 20.0 m/s2 at an angle of 30.0 degrees above the horizontal. What is the total time of flight
A 38 ohm resistor is made from a coil of copper wire whose total mass is 11.2 g. Find out the length and diameter of the wire.
An unlikely weapon was once proposed which had all of the people in China to jump up and down simultaneously. Calculate what the speed of the Earth and the people would be after the collision
A woman slowly lifts a box weighing 48.0 N from the floor to a shelf 1.50 m above, Find the net work done on the box
A 65.5 kg firefighter slides down a pole while a constant frictional force of 300 N retards her motion. Find the maximum distance the spring is compressed
The mass of a certain planet is 3.00 multiply.gif 1026 kg. What is the mean orbital radius of this second moon
A Carnot engine works between temperatutes T1 = 495K and T2 = 302K. What is the Carnot coefficient of performance, KC, of the refrigerator
Suppose that a person in Tilted Land throws a ball straight up at 20 m/s. Where does the ball hit the ground?
You need to prepare a 0.187mm-diameter tungsten wire with a resistance of 3.43 ohm. How long must the wire be
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