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A laser emits light at wavelength ? = 637 nm in a beam of diameter 2.9 mm and at an energy-emission rate of 5.4 mW. A detector in the beam's path absorbs the beam. At what rate per unit area does the detector absorb photons?
Calculate the speed of an electron after it accelerates from rest through a potential difference of 160 .
Starting from rest, you pull the string with a constant force F = 8 N along a nearly frictionless surface. At the instant while the center of the disk has moved a distance x = 0.12 m, a length d = 0.27 m of string has unwound off the disk.
A refracting telescope has an objective and an eyepiece that have refractive powers of 1.25 diopters and 300 diopters, respectively. Find the angular magnification of the telescope
A lunar lander is making its descent to Moon Base I. The lander descends slowly under the retro-thrust of its descent engine. What is the speed of the lander
An object with a mass of 0.427kg is attached to a long horizontal spring with a constant of 42.6kg/s2. How long does it take the the particle to move from -0.500m to 0.500m
A 0.58 kg toy airplane is suspended from the ceiling by a 1.6 m cord and rotates in a horizontal circle, Find the speed of the plane, Find the tension in the cord
A ball is thrown so that its initial vertical and horizontal components of velocity are 60 m/s and 15 m/s, estimate the ball's total time of flight
A heart defibrillator passes 11.8 A through a patient's torso for 5.00 ms in an attempt to restore normal beating. What was the path's resistance
A 220 g block on a 50 cm long string swings in a circle on a horizontal, frictionless table at 95.0 rpm. what is the tension on the string.
A spherical Van de Graaff ball of radius 0.15 m is charged to 500,000 Volts. It is spinning at 60 rpm; calculate the magnitude of its magnetic moment
A feather is dropped on the moon from a height of 3 meters. Determine the time for the feather to fall to the surface of the moon
A 2.4-kg block is dropped from a height of 5.0 m onto a spring of spring constant 3955 N/m. When the block is momentarily at rest, the spring has compressed by 25 cm.
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