An electron initially 3.00 m from a non conducting infinite sheet of uniformly distributed charge is fired toward the sheet. the electron has an initial speed of 410m/s and travels along a line perpendicular to the sheet. when the electron has traveled 2.00 m , its velocity is instantaneously zero, and it then reverses its direction. a- what is the surface charge density on the sheet? b- given the same initial velocity, from what distance should the electron be fired if it is to just reach the sheet?

While studying chemical reactions and conservation of matter, sarah's class conducted a variety of experiments. sarah and her lab partner found the mass of a wax candle and placed the candle in a flask. the students lit the candle and let it burn to completion. all that was left was wax and charred candle wick. per their teacher's instructions, the students found the mass of the products. their data can be seen in the data table. formulate a hypothesis the students could test to explain why the experiment did not support the law of conservation of matter. a) the students could repeat the experiment using different candles; there might have been a flaw in the candle. b) the experiment should be repeatable. the students should run several trials and then take an average of the after mass in each trial. c) the students should have someone in the class check their measurement skills as they repeat the experiment. they may have made an error using the balance. d) the students should burn the candle in a container that has some type of lid so that any gas that is a product of the reaction can be contained and massed. submit

Decreased sensitivity to an unchanging stimulus is known as

Which word expression describes how much to calculate pressure