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A firehose 15 m long is uncoiled by pulling the nozzle end horizontally along a frictionless surface at the steady speed of 2.9 m/s. The mass of 1 m of the hose is 0.25 kg. How much work has been done on the hose by the applied force when the entire hose is moving?
Responding to an alarm, an 88.4 kg fireman slides down a pole to the ground floor, 4.60 m below. What is the magnitude of the force exerted by the pole on the fireman
On a hot summer day a young girl swings on a rope above the local swimming hole. how high above the water was she when she let go of the rope
An alert physics student stands beside the tracks as a train rolls slowly past. He notes that the frequency of the train whistle is 445 Hz when the train is approaching him and 418 Hz when the train is receding from him. Using these frequencies, h..
A proton is initially at rest at a point where the potential is 515V. Sometime later the proton is at a point where the potential is 190V. If no force other than the electrostatic force acts on the proton, what is its final kinetic energy.
Two particles lie on an x axis, particle 1 at x = 1 m and particle 2 at x = 2 m. what happens to the center of mass of the two-particle system
A bird stands on a dc electric transmission line carrying 2540 A, What is the potential difference between the bird's feet
Some of the earliest atomic models held that the orbital velocity of an electron in an atom could be correlated with the radius of the atom, what is the kinetic energy of this orbital electron
A satellite moves in a circular orbit around the Earth at a speed of 5680 m/s. Determine the period of the satellite's orbit
An object with a mass of 5.00 g is moving to the right at 14.0 cm/s when it is overtaken by an object with a mass of 28.0 g , determine the speed of each object after the collision
We drop a 26-g ice cube (0C) into 1000 g of water (20C). Find the total change of entropy of the ice and water when a common temperature has been reached
The vector A s 3.50cm long and is directed into this page, In the right-handed coordinate system, where the +x-axis directed to the right, the +y-axis toward the top of the page
It is desired to slip an aluminum ring over a steel bar. At 10 the inside diameter of the ring is 4.550 and the diameter of the rod is 4.580. Find the temperature at which the ring can be removed
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