Electric Potential and Capacitance

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Electric Potential and Capacitance

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Electrical Potential Energy

A 100-µF parallel-plate capacitor is charged to 500 V. It is then disconnected from the charging source and insulated. (a) How much energy is stored on the capacitor? (b) If the plates are pulled apart to a separation that is twice their initial separation, what energy is stored on the capacitor? (c) If the answers are not id ...continues

Falling Objects

A rock is dropped from a sea cliff and the sound of it striking the ocean is heard 3.6 s later. If the speed of sound is 340 m/s, how high is the cliff?

Falling Objects

A first stone is dropped from the roof of a building. 2.50 s after that, a second stone is thrown straight down with an initial speed of 30.0 m/s, and it is observed that the two stones land at the same time. (a) How long did it take the first stone to reach the ground? (b) How high is the building? (c) What are the speed ...continues

Vectors

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Vectors

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Vectors

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Question

In This Solution, where does the 50 X 10^-6 come from, and why can I use it? The energy of a capacitor is: E = 0.5 * C * V^2 The charge on a capacitor is: Q = C * V Part A The energy stored on the capacitor = 0.5 * (100 * 10^-6) * 500^2 = 12.5 J. Part B Before the plates were pulled apart the charge on the cap ...continues

Projectile Motion

A projectile is shot from the edge of a cliff 285 m above ground level with an initial speed of vo=135 m/s at an angle of 37.0° with the horizontal, as shown in fig attached. (a) Determine the time taken by the projectile to hit point P at ground level. (b) Determine the range X of the projectile as measured from the bas ...continues