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A positive charge of 0.900u C is located in a uniform field of 9.00×10^4 N/C. A negative charge of -0.200u C is brought near enough to the positive charge that the attractive force between the charges just equals the force on the positive charge due to the field. How close are the two charges?
A 550 N physics student stands on a bathroom scale in an elevator. As the elevator starts moving, the scale reads 450N. (a) Find the acceleration of the elevator. Find the mass of the worker.
The friction force in the sled is 1000N and the angle between the two ropes is 20 degrees. Explain how hard must each player pull to drag the coach at a steady 2.0 m/s?
Express the time in terms of given quantities. T catch = ? How far from Car B's starting line will the cars be when Car B passes Car A? Express your answer in terms of known quantities.
A hydrogen atom emits a photon having an energy of 12.1 eV. What's the frequency of the photon
You want to photograph a circular diffraction pattern whose central maximum has a diameter of 1.1. How far behind the pinhole should you place the viewing screen
A 200g ball on a 60 {cm}-long string is swung in a vertical circle about a point 200 {cm} above the floor.
A 2 kg mass is held at rest on top of a frictionless and horizontal table. find the tension of the string which supports the hanging mass
The lower weight is a light bag filled with sand. Assume a pin pokes a hole in the bag and the sand slowly leaks out while the puck is revolving. What would be the puck's speed after all of the sand is gone.
When B-10 is bombarded by neutrons, a neutron can be absorbedand an alpha particle emitted. If the B-10 target isstationary the kinetic energy of the reaction products is equal to Kinetic energy of incident neutron
A gas in a cylinder with a piston that slides freely within is adiabatically expanded from 1.5 to 1.7 m3. by what amount did the internal energy of the gas change during this expansion
A "U" shaped tube (with a constant radius) is filled with water and oil, What is the absolute pressure in the water at the very bottom of the tube
A sound wave from a siren has an intensity of 86.2 W/m2 at a certain point, compute the intensity level of the sound wave due to the ambulance
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