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What is the radiation pressure (force/area) of a laser pointer on a heavy, highly absorbing surface? Assume that the laser has an output power of 1mW, a wavelength of 600nm, and a beam radi- us of 1mm. To do this problem, first compute the number of photons per unit time in the beam seen by the absorbing surface. Then compute the momentum transfer that occurs at the surface when a photon is absorbed. Finally, take the pressure to be the total momentum transfer per unit time per unit area. Write your answer in terms of Newtons of force per square meter of area (which is called a “Pascal”). Compare this pressure to the pres- sure of the atmosphere, which is about 100,000 Pascals. What if the surface is reflecting? Now do the same for a much more powerful laser with a peak intensity of 1015 W/cm2.
While sitting in physics class one day, you begin to ponder the workings of the analog clock on the classroom wall. Calculate the angular velocity of the second hand
A dog sits 1.53-m from the center of a merry-go-round with an angular speed of 1.65 rad/s. If the magnitude of the force that maintains the dog's circular motion is 38-N, what is the dog's mass.
q1. in a head-on collision a car stops in 0.27 from a speed of 12. the driver has a mass of 76 and is fortunately
Two pellets, each with charge 5 microcoulomb (1 microcoulomb = 0.000001 coulombs), are located 0.5 m apart. What is electrical force between the charges.
A 30-06 caliber hunting rifle fires a bullet of mass 0.0122 kg with a velocity of 247 m/s to the right. The rifle has a mass of 3.2 kg. What is the recoil speed of the rifle as bullet leaves the rifle.
Soles of boots that are designed to protect workers from electric shock are rated to pass a maximum rms current of 1.5mA, What is the minimum allowed resistance of the sole
An electron in an excited state of hydrogen makes a transition from n = 7 level to the n = 2 level. Calculate the wavelength of the photon involved in the transition
A parallel-plate capacitor has an area of 5.15 cm2, and the plates are separated by 1.05 mm with air between them. It stores a charge of 337pC. What is the potential difference across plates of the capacitor.
A thin film with index of refraction n = 1.29 is placed in one arm of a Michelson interferometer, perpendicular to the optical path. If this causes a shift of 8.0 bright fringes of the pattern produced by light of wavelength 693nm, what is the film t..
A heart defibrillator delivering 400 J of energy by discharging a capacitor initially at 10,000 V has a capacitance of 8.00 µF, What is the voltage of the second defibrillator
a starship departs for the triple star system of Alpha/Proxima Centauri which is 4.30 LY from earth. what will be the reading of the clocks back on earth
Ten meter long steel railroad rails are laid end to end, with no space between, on a hot day when the temperature is 115.°F. How much space now exists between each rail
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