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A hoist motor supplied by a 240 V source requires 12 A to lift an 800 kg load at a rate of 9.00 m/min. Determine the power input to the motor and the power output, both in horsepower, and the overall efficiency of the system.
A spaceship leaves Earth traveling 0.70c. A second spaceship leaves the first at a speed of 0.88c with respect to the first. Calculate the speed (including sign) of the second ship with respect to Earth
A spring has an unstretched length of 12cm. When an 80 g ball is hung from it, the length increases by 4.0 cm.Then the ball is pulled down another 4.0 cm and released. a) What is the spring constant? b) What is the period of the oscillation?
n = 2.90 mol of Hydrogen gas is initially at T = 370 K temperature and pi = 2.27×105 Pa pressure. What would be the temperature of the gas, if the gas was allowed to adiabatically expand back to its original pressure
On an airplane's takeoff, the combined action of the air around the engines and wings of an airplane exerts an 8020-N force on the plane, focussed upward at the angle of 55.0° above the horizontal. The plane rises with constant velocity in the vertic..
Three spheres, each with a negative charge of 4.0 X 10^-6 C, are fixed at the vertices of an equilateral triangle whose sides are 0.20 m long. Compute the magnitude and direction of the net force on each sphere.
What are the lowest and the highest frequencies. calculate the acceleration of the crate.
An asteroid is discovered heading straight toward Earth at 15km/s. An international team manages to attach a giant rocket engine to the asteroid. The rocket fires for 10 min, after which the asteroid is moving at 29degree to its original path at a..
A random sample of 42 college graduates revealed that they worked the average of 5.5years on the job before being promoted. The population standard deviation was 1.1 years. Using 0.99 degree of confidence, what is the confidence interval for the po..
Estimate the electron drift velocity. Estimate the current density. Estimate the electric field in the wire.
What's the advantage of launching space vehicles from high flying aircraft in place of from the ground.
The Balmer series in atomic hydrogen is the series of wavelengths emitted by the electron when it makes a transition from an energy level with n > 2 to the n = 2 level, Find the four largest wavelengths in the Lyman series
A person is standing 8 m away from a speaker and experiences an intensity level consistent with the standard pain threshold. what is the power of the speaker
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