Explain why the tip of a sewing needle is sharp

How does the electric force between two charged particles change if the distance between them is decreased by a factor of 3?

What is the resistance of al lamp that allows a current of 10 amps with 120 volts

A daredevil decides to jump a canyon of width 8.88 m. to do so, he drives a motorcycle up an incline sloped at an angle of 22.5 ◦. the acceleration of gravity is 9.8 m/s 2.

The intensity of light from a star varies inversely as the square of the distance. If you lived on a planet ten times farther away from the sun than the Earth, how would the light intensity of the sun compare with that on Earth?

Which of the following universal forces is the most effective over long distances? A. Electric B. Gravitational C. Magnetic D. Strong nuclear

Three capacitors C1 = 10.1 µF, C2 = 23.0 µF, and C3 = 29.4 µF are connected in series. To avoid breakdown of the capacitors, the maximum potential difference to which any of them can be individually charged is 125 V.

What is the net force in the x-direction? 30 N 34 N 55 N 65 N

If an object does not have domains, will it be possible to make it magnetic?

If the loop is then converted into a rectangular loop measuring 2.1cm on its shortest side in 6.50ms, and the average emf induced across the loop is 14.7V during this time period, what is A. the strength of the B-field

Why would you expect to see similar rocks and rock structures on two land masses that were connected at one time?