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(A) Find the potential energy of a system of two small spheres, one carrying a charge of 2.30 µC and the other a charge of -4.00 µC with their centers separated by a distance of 0.250 meter. Suppose zero potential energy when the charges are infinitely separated.
_______ J
(B) Assume that one of the spheres is held in place and the other sphere, which has a mass of 1.50 gram is shot away from it. Find what minimum initial speed would the moving sphere need in order to escape completely from the attraction of the fixed sphere? (To escape, the moving sphere would have to reach a velocity of zero when it was infinitely distant from the fixed sphere.)
_____ m/s
a parallel-plate air capacitor of area a18.0cm2 and plate separation d2.60mm is charged by a battery to a voltage 68.0
While running, a person dissipates about 0.60 J of mechanical energy per step per kilogram of body mass. If a 64 kg person develops a power of 65W throughout a race, how fast is the person running? Assume that a running step is 1.5 m long.
A dentist's chair by a patient in it weighs 2240 N. The output plunger of a hydraulic system begins to lift the chair, when the dentist's foot applies a force of 35.2 N to the input piston.
An object floating in a lake has 15 percent of its volume above the lake surface. What is the density of the object
a horizontal force of 750 n is needed to overcome the force of static friction between a level floor and a 250 kg
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If your roommate turns up the radio, increasing the sound level from 70 dB to 82 dB, what is the factor by which the intensity (in W/m^2) increases
Estimate the change in gravitational potential energy of a 70 kilogram skier-Earth system when the skier goes down this slope
a analyse a technological device that applies the principles of linear or circular motion. b assess the impact on
A spring is compressed by 0.0617 m and is used to launch an object horizontally with a speed of 2.58 m/s. at what angular frequency (in rad/s) would it oscillate
A 200-Volt battery is connected to a parallel-plate capacitor that has a dielectric slab (k= 2) filling the space between the plates. The plates are 10cm x 10cm and are 3mm apart.
Two parallel wires are each carrying 10 A and are separated by 4.0 m. If the currents are in opposite directions, what is the magnitude of the magnetic field halfway between them?
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