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Three fire hoses are connected to a fire hydrant. Each hose has a radius of 0.014 m. Water enters the hydrant through an underground pipe of radius 0.096 m. In this pipe the water has a speed of 3.0 m/s.
(a) How many kilograms of water are poured onto a fire in one hour by all three hoses?
(b) Find the water speed in each hose.
The diameter of the He atom is approximately 0.10nm. Compute the density of the He atom in (assuming that it is a sphere).
A converging lens with a focal length of 6.20cmforms an image of a 3.00mm -tall real object that is to the left of the lens. Where are the object and image located
the uss enterprise accelerates from rest at 100000 ms2 for a time of four seconds. how far did the ship travel in that
It is desired to build a heat pump that has an output temperature of 31 °C. Calculate the maximum coefficient of performance for the pump when the input source is ground water at 8.1 °C
An electron drops from the {\rm L} shell to the {\rm K} shell and gives off an X-ray with a wavelength of 0.0205 {\rm nm}. What is the atomic number of this atom
The four tires on the author's car are inflated to an absolute pressure of 2.8 multiply.gif 105 Pa.what is the contact area between each tire and the ground
A 55 kg woman and an 80 kg man stand 14.0 m apart on frictionless ice. How far will the man have moved when he collides with the woman
The springs of a 1500 kg car compress 5.0 mm when its 68 kg driver gets into the driver's seat. what will be the frequency of vibrations
Two toy cars resting on a frictionless table top are separated by a spring compressed by tying it with a thread. wht is the mass of the car moving to the left
A 35.0-kg child swings in a swing supported by two chains, each 2.92 m long. The tension in each chain at the lowest point is 430 N. Find the child's speed at the lowest point
On a cold day, 16000 J of heat leaks out of a house. The inside temperature is 20.0° C, and the outside temperature is -18° C. What is the increase in the entropy of the universe that this heat loss produces?
A rotating wheel requires2.90s to rotate through 37.0 revolutions. What is the constant angular acceleration of the wheel
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