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A laser is used in eye surgery to weld a detached retina back into place. The wavelength of the laser beam is 511 nm, while the power is 1.5 W. During surgery, the laser beam is turned on for 0.049 s. During this time, how many photons are emitted by the laser?
When n moles of an ideal gas is allowed to expand from an initial volume of 10 m3 at a constant temperature T the work done is equal to : - nRT ln 4, What was the final volume of the gas
A beam of hydrogen molecules (H2) is directed toward a wall, at an angle of 68 ° with the normal to the wall. What is the beam's pressure on the wall
A simple camera telephoto lens consists of two lenses. The objective lens has a focal length f1 = +44.0 cm. How far behind the concave lens should the film be placed
A uniform magnetic field is at right angles to the plane of a wire loop. what is the area of the loop
A large wooden turntable in the shape of a flat disk has a radius of 2.25m and a total mass of 135kg, Find the angular speed of the turntable after the parachutist lands
In some places, insect "zappers," with their blue lights, are a familiar sight on a summer's night. how many turns are in the secondary coil
A gauge-12 wire has diameter centimeters and length meters. while the voltage volts is applied to the ends of the wire, the current is amperes. The concentration of free electrons in the wire is per cubic meter.
A 40-kg pole vaulter running at 14 m/s vaults over the bar. Her speed while she is above the bar is 1m/s. Avoid air resistance, in addition to any energy absorbed by the pole, and determine her altitude as she crosses the bar.
A projectile is ?red into the air from ground level over level ground. The initial speed of the projectile is 30 m/s, Where does the center of mass of the projectile land
A particle with a charge 3.2 x 10^-19 C is moving at a speed of 5x10^7 m/s that makes an angle of 40 degrees with respect to a uniform magnetic field B, Determine the magnetic field strength B
A child pulls an imaginary friend in a wagon at constant speed for 10m with a force of 16N. how much work does the child do
A 4.7 e2 kg hot-air balloon takes off from rest at surface of the earth. The nonconservative wind and lift forces take the balloon up, doing +9.70 multiplied by 104J of work on the balloon in the process. At what height above the surface of the ea..
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