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A 5.1- kg concrete block rests on a level table. A 3.1- kg mass is attached to the block by a string passing over a light, frictionless pulley. If the acceleration of the block is gauged to be 1.1 m/s2, what is the coefficient of friction among the block and the table?
John takes off for Vega (d ~ 25LY) traveling at 99.99% the speed of light. As soon as he arives, the ship turns around, How old are they when John returns
A 83.55kg woman walked a 5k race in 53.33 minutes. How much power did it take to complete the race
An electron has a de Broglie wavelength ? = 7.0×10?10m, What voltage was needed to accelerate it to this speed and What is its speed
Raindrops fall 1830 m from a cloud to the ground. If they were not slowed by air resistance, how fast would the drops be moving when they struck the ground
An organ pipe is shown to resonate at 240 Hz, 320 Hz, and 400 Hz. It does not resonate at any other frequencies between 240 Hz and 400 Hz, How long is the organ pipe
A cube of ice is taken from the freezer at -7.7°C and placed in a99g aluminum calorimeter filled with297g of water at room temperature of 20°C. What was the mass of the ice cube
Two small plastic spheres each have a mass of 1.9g and a charge of -60.0nC, By what factor is the electric force on a sphere larger than its weight
What's your normal body temperature? It may not be 98.6°F, the oft-quoted average that was determined in the nineteenth century. What is the difference between these averages
Light of wavelength 5.0*10^-7 m in air is incident normally (perpendicular) on a doubled slit. The distance between the slit is 4.0*10^-4 m, Caculate the line density in slits/mm of the diffraction grating
A cell membrane has a surface area of 1.0 x 10^-7 m^2, a dielectric constant of 5.6 and a thickness of 8.5 nm. How much energy is stored in this capacitor
The ratio of the average acceleration values is a1/a2 = 1.24. Find out the velocity of the car at the end of the initial ten-second interval.
A farsighted man uses eyeglasses with a refractive power of 1.90 diopters. Wearing the glasses 0.03 m from his eyes, What is the correct contact lens prescription, in diopters
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