Magnitude of the force of repulsion
Two small spheres spaced 50.0 centimeters apart have equal charge. How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.40 x 10^{-21} newtons? Please explain.
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A police car is traveling east at 40.0 m/s along a straight road, overtaking a car ahead of it moving east at 30.0 m/s. The police car has a malfunctioning siren that is stuck at 1 000 Hz. What is the wavelength in front of the police car?
An elevator and its load have a combined mass of 1450 kg. Find the tension in the supporting cable when the elevator, originally moving downward at 13 m/s, is brought to rest with constant acceleration in a distance of 37 m.
Air at 2900 R, 435 psia enters a turbine operating at steady state and expands adiabatically to the exit, where the temperature is 1500 R.
The estimate of the slope is? The estimate of the y-intercept is? The prediction for the sales for a broker who brings in 25 clients is?
A die is rolled 24 independent times. Let Y be the sum of the 24 resulting values. Recalling that Y is a random variable of the discrete type approximate: (a) P(Y >= 86) (b) P(Y < 86) (c) P(70 < Y <= 86).
It supplies heat to a room at a rate of 46,000 Btu/hr in order to maintain the temperature at 70 degrees F. The environment is at a temp of -10 degrees F. Determine power required to drive the compressor.
Utech Company bottles and distributes Livit, a diet soft drink. The beverage is sold for 50 cents per 16-ounce bottle to retailers, who charge customers 75 cents per bottle.
Plot the maximum efficiency of a nuclear power plant as a function of the maximum allowable temperature in the reactor core.
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