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You are setting up two standing string waves. You have a length of uniform piano wire that is 3.0 m long and has a mass of 150 g. You cut this into two lengths, one of 1.0 m and the other of 2.0 m, and place each length under tension. What should be the ratio of tensions (expressed as short to long) so that their fundimental frequencies are the same?
A pump is required to lift a mass of 770 kg of water per minute from a well of depth 14.2 m and eject it with a speed of 17.5 m/s. How much kinetic energy does the pump give the ejected water
An electrical point charge of 4.50 mC is located on the x-axis at x = 8.00 cm. A second point charge is located on the y-axis at y = 5.70 cm. What is the distance between the two charges
A spring whose stiffness is 1000 N/m has a relaxed length of 0.49 m. what is the change in the potential energy of the spring
The velocity of an airplane with respect to the ground is 2.00 x 102 m/s at an angle of 30.0 degrees NORTH of EAST. What is the velocity of the air with respect to the ground
During an earthquake, the top of a building oscillates with an amplitude of 32cm at 1.3Hz. What is the maximum acceleration of the top of the building
Three wires are connected at a branch point. Find the current carried by the third wire into the branch point
A sanding disk with rotational inertia 2.0 multiply.gif 10-3 kg·m2 is attached to an electric drill whose motor delivers a torque of 8 N·m about the central axis of the disk. compute the angular momentum of the disk
Cesium is a monovalent metal having a density of 1.870 g/cm3 and a molar mass of 132.9 g/mol. Use this information to calculate the density of charge carriers
In order to study the long-term effects of weightlessness, astronauts in space must be weighed (or at least "massed"). Find the mass of the astronaut
The free-fall acceleration on the surface of Neptune is about one and one half times that on the surface of the Earth. Find the ratio of their average densities
Mary needs to row her boat across a 100-{rm m}-wide river that is flowing to the east at a speed of 1- {rm m/s}. Mary can row the boat with a speed of 2- {rm m/s} relative to the water.
Water flows at 0.990 m/s from a hot water heater, through a 450-kPa pressure regulator. What's the flow speed in this pipe
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