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A 460 kg piano is being lowered into position by a crane while two people steady it with ropes pulling to the sides. Bob's rope pulls to the left, 15 degrees below horizontal, with 510 N of tension. Ellen's rope pulls toward the right, 27 degrees below horizontal.
a) What tension must Ellen maintain in her rope to keep the piano descending at a steady speed?
b) What is the tension in the main cable supporting the piano?
To finance her community college education, Joanna takes out a Stafford loan for $4500. How much will she pay
A car is traveling at 47.0 km/h on a flat highway. what is the minimum distance in which the car will stop
A 16 cm x 16 cm square loop of wire lies in the xy-plane with its bottom edge on x-axis. The resistance of the loop is 0.490 ohms. A magnetic field parallel to the z-axis is given by B= 0.830 y^2 t, where B is in tesla, y in meters, and t in seconds...
A comet with a mass of 7.75 1011 kg strikes Earth at a speed of 26 km/s. Find the kinetic energy of the comet in joules
A person scuffing her feet on a wool rug on a dry day accumulates a net charge of -95?C. By how much does her mass increase
He would like a prescription for contact lenses to serve the similar purpose. What is the correct contact lens prescription, in diopters.
A galvanometer has a coil with a resistance of 75 ?. A current of 156 mA causes full scale deflection. Calculate the value of the series resistor that is required in order to use the galvanometer as a Voltmeter with 40 V full scale
you need to determine the density of an unknown liquid. to this end you perform an experiment with a block and notice that the block floats in this unknown liquid with 4.6 cm of its side submerged. determine the density of the unknown liquid
How many kilocalories of heat are produced when the brakes are used to bring a 930 kg car to rest from a speed of 102 km/h.
Two Stars of equal mass revolve in a circular orbit about a center of mass midway between them. Find the mass of each star
In 9.00 days the number of radioactive nuclei decreases to one-eight the number present initially
A meteor that falls to earth from a great distance has a speed of 11 km/s. In class we found that the temperature of an iron meteor is 290,000K. We assumed all of the energy heats the meteor and none of it is transferred to the surroundings.
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