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A battery has an emf E and an internal resistance r. When the battery is connected to a 20 Ω resistor, the current through the battery is 0.65 Amp. When the battery is connected to 55 Ω resistor, the current is 0.50 Amp.
a) Determine the battery emf.
b) Determine the battery internal resistance.
A standing wave on a 75.0cm long string has three antinodes. The Wavelength is .50m. If the string has linear mass density 3.78×10?5kg/m and tension 10.5N , what are the wave's frequency
A small, 1.90-mm-diameter circular loop with R = 1.40×10?2? is at the center of a large 110-mm-diameter circular loop. What is the induced current in the inner loop
an electric current is given by the expression i t 100 sin 120pit where i is in amperes and t is in seconds. what is
A 1000 kilogram car rounds a curve of radius 70 meter banked at an angle of 12 degree. If the car is traveling at 84 km/h, find will a force be required
A 0.464-nm photon collides with a stationary electron. After the collision, the electron moves forward and the photon recoils backwards. Find the momentum of the electron
The electric field inside a 50.0?cm? long copper wire is 5.00mV/m .What is the potential difference between the ends of the wire
The driver of a car sets the cruise control and ties thesteering wheel so that the car travels at a uniform speed of 10 m/sin a circle with a diameter of 130 m. What linear distance does it travel in this time
One mole of a ideal gas initially at temp To=0C undergoes an expansion at a constant pressure of 1atm to four times it original volume
The longest "string" (a thick metal wire) on a particular piano is 3.0 m long and has a tension of 300.0 N. What is the total mass of the wire
The projection lens in a certain slide projector is a single thin lens. A slide 23.9 mm high is to be projected so that its image fills a screen 1.84 m high. Determine the focal length of the projection lens
a soccer player kicks the ball toward a goal that is 11.0 m in front of him. the ball leaves his foot at a speed of
Sound is generated from standing waves in two tubes which are bothopen at both ends and are identical, apart from one tube havinglength L and the other tube being only seven eighths as long
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