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Human skin is most sensitive to ultraviolet light of approximate wavelength 300 nm.
Find the energy of a single photon of such light.
The threshold for sunburn occurs when 1 cm2 of skin absorbs about 1015 of these UV photons over an interval of several hours or less. How much energy is absorbed?
What is the intensity of the UV light if it delivers this much energy in 10.7 minutes? (By way of comparison, the ultraviolet component of sunlight normally incident on the earth's surface at sea level ranges in wavelength from 310 nm to 400 nm, with a total intensity of about 40 W/m2.)
If the index of refraction of a plastic prism is 1.6711 ± 0.008467, what is the speed of light as it travels through the prism
A train car with mass m1 = 631 kg is moving to the right with a speed of v1 = 7.2 m/s and collides with a second train car with mass m2 = 723 kg. What is the final speed of the train cars latched together
A jet of water squirts out horizontally from a hole near the bottom of the tank, What is the height, h, of the water level in the tank
A piece of cheese with a mass of 1.30kg is placed on a vertical spring of negligible mass and a force constant k= 1600 N/m that is compressed by a distance of 16.2cm. how high does the cheese rise from this initial position
The tub of a washer goes into its spin cycle, starting from rest and gaining angular speed steadily for 7.00 s, Through how many revolutions does the tub turn while it is in motion
The wire is located in a uniform magnetic field B directed perpendicular to the wire. Compute the magnitude of B when the force on the wire due to B is 0.200 N.
Compressed air is used to fire a 52 g ball vertically upward from a 1.7-m-tall tube. How high does the ball go above the top of the tube
Most of the motion generated by joints in the human body are examples of levers. An example of a third class lever is the forearm, what force is exerted by the biceps muscle
q1. a jetliner can fly 5.32 hours on a full load of fuel. without any wind it flies at the speed of 220 ms. the plane
A 0.200-kg block along a horizontal track has a speed of 1.80m/s at once before colliding with a light spring of force constant 44.2 N/m located at the end of the track.
10.0g of aluminum at 200?C and 22.0g of copper are dropped into 42.0cm3 of ethyl alcohol at 15?C. What was the initial temperature of the copper
The potential difference between the plates of a capacitor is 145 V. Midway between the plates; a proton and an electron are released. The electron is released from rest.
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