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A battery powers some DC circuit. When the current is 40.0 mA, the voltage available to the circuits is 11.2V. When the current is doubled the voltage available decreases to 10.4 V. What is the internal resistance of the battery?
In an RLC series circuit that includes a source of alternating current operating at fixed frequency and voltage, the resistance R is equal to the inductive reactance. If the plate separation of the capacitor is reduced to one fourth of its original v..
An astronomer observes a comet and measures the wavelength of the H? line to be at 486.2 nm. In the lab, the line is found to be at 486.1 nm. What is the Lorentz factor for the comet
radiation from the head is a major source of heat loss from the human body. model a head as a 20-cm-diameter 20-cm-tall
A pair of closely spaced square conducting plates measure 8.0cm on a side. What is the charge on the plates
A comet moves about the Sun in an elliptical orbit, with its closest approach to the Sun being about 0.570 AU and its greatest distance from the sun being 41.5 AU (1 AU = the Earth-Sun distance). What is its speed when it is farthest from the Sun
A 1 022-kg satellite orbits the Earth at a constant altitude of 91-km. What is the change in the system's kinetic energy
A 26.2-kg dog is running northward at 2.21m/s, while a 5.30-kg cat is running eastward at 2.83 m/s. Their 67.2-kg owner has the similar momentum as the two pets taken together. Find the magnitude and direction of the owner's velocity.
A storage tank has a diameter of 80 ft, a height of 25 feet, andcontains oil to a height of 15 ft. The suction pumps, whichcan handle 15, 000 bbl/d are started, but the safety valves areclogged and a vacuum is drawn in the tank. The roof is flatan..
A fighter plane is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 2.3 x105 Newton. Calculate the work done on the plane by the catapult
A 15.0 ampere current flows through a 4.75 msection of wire, perpendicular to a 0.250 T magnetic field.What is the magnitude of the force exerted by the field on the wiresection?
A block of mass m is attached to a string that is wrapped around the circumference of a wheel of radius R and moment of inertia I. Find the moment of inertia of the wheel if its radius is 8.0 cm
A person notices a mild shock if the current along a path through the thumb and index finger exceeds 72µA. Compare the maximum possible voltage without shock acrossthe thumb and index finger with a dry-skin resistance of3.0 multiplied by 105 and a we..
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