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In June 1985, a laser beam was sent out from the Air Force Optical Station on Maui, Hawaii, and reflected back from the shuttle Discovery as it sped by, 394 km overhead. The diameter of the central maximum of the beam at the shuttle position was said to be 9.6 m, and the beam wavelength was 520 nm. What is the effective diameter of the laser aperture in meters at the ground station? (Hint: A laser beam spreads only because of diffraction; assume a circular exit aperture.)
1. imagine the lamp as the sun the sphere as the moon and your head as the earth. your eyes are in los angeles. move
Two violin strings are tuned to the same frequency, 294 rm/hrz. What will be the beat frequency heard
An at wood machine consist of 2 masses Ma and Mb, which are linked by an inelastic cord of legible masses that pieces over a pulley. if the pulley has radius Ro and moment of inertial I about its axle, decide the acceleration of masses Ma and Mb, and..
nbspa proposed solar collector installation has a frontal area exposed to the sun of 50.0 m2 and combines a
A proton moving with a speed of 3.0 × 105 m/s perpendicularto a uniform magnetic field of 0.20 T will follow which type of path (include radius in answer ifapplicable)? (qp = 1.6 × 10−19 C and mp = 1.67 × 10−27 kg)
An 18.5-g mass is suspended 4.97 cm above a nonconducting flat plate, directly above an embedded charge of q. by how much will the mass be changed
Two carts of unequal mass (massA>massB) move on parallel firctionless horizontal tracks. both carts start from rest and have the same constant force exerted on them.until they reach the finish line. The force begins to exert on car A first.
After having collected samples along the shore all day long, a marine biologist walks back to her campsite, 1.69 km away. What distance did the dog run
q1. a 2.0 kg piece of wood slides on the surface. the curved lateral sides are perfectly smooth no resistance but the
A car, initially traveling with a uniform velocity, accelerates at a rate of 1.0 m/s^2 for a period of 12 seconds. If the car traveled 190 m during this 12 second period, what was the velocity of the car when it started to accelerate?
A sprinter is just coming out of the starting block, and only one foot is touching the block. How large is the resultant of these forces
The brakes of a truck cause it to slow down by applying a retarding force of 3950 N to the truck over a distance of 882 m. What is the work done by this force on the truck
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