Who is the president of Africa

What factor is responsible for altering the speed of an electromagnetic wave? A) amplitude B) wavelength Eliminate C) type of medium D) frequency of the wave

A piston-cylinder device initially contains 2 L of air at 100 kPa and 25°C. Air is now compressed to a final state of 600 kPa and 150°C. The useful work input is 1.2 kJ.

A piece of plastic is uniformly charged with surface charge density eta1. The plastic is then broken into a large piece with surface charge density eta2 and a small piece with surface charge density eta3.

The drawing shows three identical rods (A, B, and C) moving in different planes. A constant magnetic field of magnitude 4.50 T is directed along the + y axis. The length of each rod is L = 1.3 m, and the speeds are the same, vA = vB = vC = 2.6 m/s.

Which operation gives a resultant vector?

What is the electric potential of a 2.2 µC charge at a distance of 6.3 m from the charge? Recall that Coulomb's constant is k = 8.99 * 109 N • ___ V What is the electric potential at a distance of 99 m from the charge?___ V

what is a possible unit for the product VI, where V is the potential difference across a resistor and I is the current through the same resistor?

In old western movies, cowboys often would put their ear to a train track to listen for an oncoming train. What benefit would this method provide over listening for a train by listening for sound through the air? A) The sound would be louder.

What is meant by "reflecting" and "refracting" telescopes?

How would you find the speed of a ball thrown in to the air - it takes 6 seconds to get tho the top. The height is not given.