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A positive object touches a neutral electroscope, and the leaves separate. Then a negative object is brought near the electroscope, but does not touch it. What happens to the leaves? Answer They move closer together. They are unaffected. They separate further. cannot be determined without further information
Imagine you are an astronaut who has landed on another planet and you want to determine the free fall acceleration on that planet. In one of the experiments you decided to conduct, you use a pendulum 0.50 m long and find that the period of oscill..
A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. He notes that it takes the wave 0.675 s to reach the opposite tower, 20.0 m away. If a 1 meter length of ..
A boat is tied to a dock by four ropes. Two ropes, with a tension of 55 N each, are at right angles to the dock. What is the magnitude of the sum of these forces
A spring has a force constant of 931N/m and an unstretched length of 8 cm. One end is attached to a post that is free to rotate in the center of a smooth table.
Huygens' principle (first described by the Dutch scientist Christiaan Huygens in 1678) uses geometry to determine the shape of a wavefront at a time.
The intake in the figure has cross-sectional area of 0.80 m2 and water flow at 0.41 m/s. What is the pressure difference between inlet and outlet
A racer starts her car from rest and accelerates at 10m/s2 for a distance of 400m (1/4mi)
A 3.60-{rm m}-long, 430 {rm kg} steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 66.0 {rm kg} construction worker stands at the far end of the beam. What is the magnitude..
Two very thick equally-magmetized square plates of side 0.23m and of mass 20 g, Calculate the B field between the two plates, if the distance between them is 0.123 cm
A battery has an internal resistance of 0.60 ?. A number of identical light bulbs, each with a resistance of 9.6 ?, How many bulbs are connected
When a 47.0-V emf device is placed across two resistors in series, a current of 15.0 A is flowing in each of the resistors. find the magnitude of the larger of the two resistances
A long aluminum rod is struck at one end. At the other end an observer close to the rod, hears the sound of the blow twice, What is the length of the rod
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