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A lighthouse sweeps its beam of light around in a circle once every 7.2 s. To an observer in a spaceship moving away from Earth, the beam of light completes one full circle every 9 s.
What is the speed of the spaceship relative to Earth
A 60 kg person jumps off a diving board and hits the water with a speed of 21 m/s. Determine the magnitude and direction of the average force that the water exerts on the diver
A copper wire has a square cross section 2.7 on a side. The wire is 3.8 long and carries a current of 4.0 . The density of free electrons is 8.5*10^28 m^-3.
An oil drop whose mass is determined to be 3.3x10^-15 is held at rest between two large plates separated by 1cm while the potential difference between them is 340 V. How numerous excess electrons does this have here.
A man standing on very slick ice fires a rifle horizontally. The mass of the man together with the rifle is 70{\rm kg} , what is the final speed of the man
If this radiation is directed at a crystal, the first-order maximum in the reflected radiation occurs when the angle of incidence is 2.17o. What is the spacing between reflecting planes in the crystal
A 150MW laser pulse is focused with a lens to a diameter of 1.0?m. What is the laser beam's electric field amplitude at the focal point
What is the wavelength of the 46,000-Hz radio wave used by "radio-controlled" clocks and wristwatches
A thin rod has a length of 0.25 meter and rotates in a circle on a frictionless tabletop. evaluate what is the angular velocity of the rod
Radon is a radioactive gas, commonly found in the basement of ahouse. It has a half- life of 3.8 days. What is the decay constant of radon
A 2.0-kg solid cylinder of radius 0.5 m rotates at a rate of 40 rad/s about its cylindrical axis. What power is required to bring the cylinder to rest in 10 s
A 12gram bullet moving horizontally strikes and remains in a 3 kilogram block initially at rest on the edge of a table. Evaluate what was the initial speed of the bullet
The mass of a robot is 6210 kg. This robot weighs 3970 N more on planet A than it does on planet B. What is the difference MA - MB in the masses of these planets
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