Physics Answers

Name the type of force that acts on a structure when a moving object

strikes it.

 What is the capacitance of an empty parallel-plate capacitor with metal plates that each 2

have an area of 1.00 m , separated by 1.00 mm?. How much charge is stored in this

capacitor if a voltage of 3.00 x 103 V is applied to it?

Two small conducting and identical spheres A and B have charges -32nC and +20nC respectively, they are separated by a distance of 0.23m.

a. What is the magnitude of the electric force between two spheres? Is this force attractive or repulsive?

b. What is the magnitude of the gravitational force between two spheres? Is this force attractive or repulsive?

On threads of equal lengths of 50 cm and

negligible masses, about the same point

two balls of equal mass were hung

0.3 g each. When the balls are charged

equal amounts of the same

charges are reflected five times

less distance than length

the end. Calculate the charge of one

balls.

a boy pushes a 5000kg box along a floor with a force of 2000N.if the velocity of the box is uniform.What is the coefficient of friction between the box and the floor

using zero reference potential at infinity, determine the amount by which point a charge of 8x10^-8 c alter the electric potential at point 1.5m away where the charge is positive

Instructions: Show the whole solutions in each question.

1. Determine the net capacitance of the capacitor combination when the capacitances are C1=12µF, C2=2µF, C3=4µF When the 12V potential difference is maintained across the combination, find the charge and the voltage across each capacitor.

2. Compute the capacitance of a capacitor with two parallel plates and separated by a layer of paraffin that is 0.25cm thick. The area of each plate is 70cm^2, and the dielectric constant of paraffin is 2.

A 240 V two-bar electrical eadiator is rated 1 KW per bar. Calculate the resistance in the radiator circuit when one bar is switched on.

A child of mass 30 kg slides from rest down a wooden pole by a distance of 3.0. calculate the average force of friction acting on the child if her speed is 2.0 when she hits the ground

Three forces of magnitude 6N,2N,3N act on a small object in directions north,south and west respectively. Find the direction and magnitude of the resultant force.If the force to move and its mass is 0.2kg.Calculate the initial acceleration.