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LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping it. A typical LASIK laser emits a 1.0mm--diameter laser beam with a wavelength of 193nm . Each laser pulse lasts 15ns and contains 1.9mJ of light energy. What is the power of one laser pulse? Answer in W/m2. During the very brief time of the pulse, what is the intensity of the light wave? Answer in dB.
Air passes through a large-diameter glass tube, then through a small-diameter tube, and finally through a large-diameter tube again, Find the velocity of the air in the small-diameter tube
Given a planet's circumference and using the the Universal gravitational constant how do I obtain a planet's mass and then calculate the weight of an astronaut on that planet
There is a charge of -3e locked down at a point on a table. 15 meters away, a charge of 3e is released from a scientists hand. What is the potential energy of the charge just as it is released from the scientists hand
Estimate the number of breaths taken by a human being during an average lifetime
A ball of mass 0.60 kg is fired with velocity 200 m/s into the barrel of a spring gun of mass 2.0 kg initially at rest on a frictionless surface. What fraction of the ball's initial kinetic energy is stored in the spring
A rubber ball of mass 39.0 g is dropped from a height of 1.80 m onto a floor. The velocity of the ball is reversed by the collision with the floor, What impulse was applied to the ball during the collision
An alpha particle, which is a helium nucleus, has a mass of 6.64*10^-27 kg. It is travleing horizontally at 42.3 km/s when it enters a uniform, What is the diameter of the path followed by the alpha particle
A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 24.0° below the horizontal, Find the length of time the car is in the air
The plates of a 2.5 E-9 F parallel plate capacitor are separated by 1.2 mm. What is the area of each plate
A square loop with 80 tight turns and sides 15 cm is made with copper wire of diameter 1.2 mm. determine the current induced in the loop
A charging RC circuit controls the intermittent windshield wipers in a car. The emf is 12.0 V. What resistance should be used in the charging circuit if the wipers are to operate once every 1.40 s
a Hydrogen atom is in the gound state. it absorbs some energy, leaving the atom in an excited state, calculate the wavelength of the second photon
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