## What is the strength of the electric field 0.1 mm above the center of the top surface of the plate?

A thin, horizontal, 14-cm-diameter copper plate is charged to 4.5 nC . Assume that the electrons are uniformly distributed on the surface. A. What is the strength of the electric field 0.1 mm above the center of the top surface of the plate? B. What is the strength of the electric field at the plate’s

## What is the width of the central maximum on a screen 2.0 m behind the slit?

A 0.50-mm-wide slit is illuminated by light of wavelength 500 nm. What is the width of the central maximum on a screen 2.0 m behind the slit? Please answer in mm. 3 Answers The halfwidth is the position of the 1st diffraction minimum, solved as follows: Θ = arcsin(m*lambda/(d)) = 1.00000016666674E-3 rad, 5.72957890623833E-2 deg y

## How much work does gravity do on the book?

A 1.7kg book is lying on a 0.80m -high table. You pick it up and place it on a bookshelf 2.3m above the floor. A) During this process, how much work does gravity do on the book? B) During this process, how much work does your hand do on the book? Answer (A) The expression

## PLEASE HELP!!! The Kb of pyridine, C5H5N, is 1.5 x 10-9. Calculate the pH of a solution of 0.157 M pyridine.?

The Kb of pyridine, C5H5N, is 1.5 x 10-9. Calculate the pH of a solution of 0.157 M pyridine. Work Plz. THANKS! 3 Answers C5H5N in water –> C5H5NH+ & OH- Kb = [C5H5NH+] [OH-] / [C5H5N] 1.5e-9 = [x] [x] / [0.157] X2 = 2.355e-10 x = = [OH-] = 1.53e-5 molar pOH =