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Why must both switches be closed when taking the ammeter and voltmeter readings? What is the effect of introducing the ammeter into the circuit? Of introducing the voltmeter? What is the significance of a negative theoretical value for a branch current?
A boy whirls a ball on a string in a horizontal circle of radius 0.8 meter, such that the centripetal acceleration is equal to g. Calculate the frequency of the ball in revolutions per minute
A hammer slides down a roof of angle theta (respect to ground). It slides along the roof distance D. Find how far from the base of the building the hammer lands
A 2.20 kg frictionless block is attached to an ideal spring with forces constant 314N/m. At first the block has velocity -3.60 m/s and displacement 0.300-m.
"A 200 lb man jumps out of a window into a fire net 30 ft below. The net stretches 6 ft vertically before bring in the man to rest and tossing him back into the air. The maximum potential energy in (ft lb) of the net is:”
On one of the shelves in your physics lab is displayed an antique telescope. A sign underneath the instrument says that the telescope has a magnification of 20, what is the focal length fe of the eyepiece
A battery with an emf of 12 V and an internal resistance of 1Ω is used to charge a battery with an emf of 10 V and an internal resistance of 1 Ω. Discover the current in the circuit.
A narrow beam of ultrasonic waves reflects off the liver tumor illustrated in the figure below. The speed of the wave is 8.4% less in the liver than in the surrounding medium. Decide the depth of the tumor.
a charge of 6 pc is uniformly distributed throughout the volume between concentric spherical surfaces having radii of
suppose that you wish to fabricate a uniform wire out of 0.800 g of copper. assume the wire has a resistance r 0.300
Two identical conducting spheres each having a radius of 0.500 cm are connected by a light 2.00-m-long conducting wire. A charge of 60.0 µC is placed on one of the conductors
Two 1.50-V batteries-with their positive terminals in thesame direction-are inserted in series into the barrel of a flashlight. What is the lamp's resistance
A diver 50m deep in 10C fresh water exhales a 1.2-cm-diameter bubble. What is the bubble's diameter just as it reaches the surface of the lake, where the water temperature is 20C? Suppose that the air bubble is always in thermal equilibrium with the ..
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