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Questions in physics

[Answered] During a thunderstorm, the potential difference between the thunderclouds and the ground builds up to [tex]1.5 \times 10^6[/tex] V. In each stroke of lightning, 30 C of charge passes between the thunderclouds and the ground. Lightning strokes to the ground occur, on average, at 2-minute intervals. Calculate: i) The average current between the thunderclouds and the ground. ii) The energy transferred in each stroke of lightning.

[Answered] In an 8.00 km race, one runner runs at a steady 11.0 km/h and the other runs at 14.8 km/h. How far from the finish line is the slower runner when the faster runner finishes the race?

[Answered] What characteristics of the medium determine the speed of sound? How would raising the pitch of a singing voice affect the speed with which the song is carried through the room?

[Answered] A motor does 5,000 joules of work in 20 seconds. What is the power of the motor?

[Answered] A playground is on the flat roof of a city school, [tex] hb = 6.20 \text{ m} [/tex] above the street below (see figure). The vertical wall of the building is [tex] h = 7.70 \text{ m} [/tex] high, to form a 1.5-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching it at an angle of [tex] \theta = 53.0° [/tex] above the horizontal at a point [tex] d = 24.0 \text{ m} [/tex] from the base of the building wall. The ball takes 2.20 s to reach a point vertically above the wall. (a) Find the speed at which the ball was launched. (b) Find the vertical distance by which the ball clears the wall. (c) Find the horizontal distance from the wall to the point on the roof where the ball lands.

[Answered] What are five fun facts about the cell membrane?

[Answered] A dragster traveling at 5 m/s north increases its velocity to 23 m/s north in 4 seconds. What is its acceleration during this time interval?

[Answered] A dragster traveling at 5 m/s north increases its velocity to 23 m/s north in 4 seconds. What is its acceleration during this time interval?

[Answered] How can I access physics questions on this site? Thank you.

[Answered] A stone is thrown horizontally at a speed of 5 m/s from the top of a cliff 78.4 m high. A. How long does it take the stone to reach the bottom of the cliff? B. How far from the base of the cliff does the stone strike the ground?