Top answers

What is the difference between an elastic and inelastic collision

In all collisions momentum is conserved. However in elastic collision kinetic energy is also conserved, molecules colliding is an elastic collision.If kinetic energy is not conserved that then the collision ...
EH
Answered by Emma H. • Physics tutor
3634 Views

What does a stress-strain curve for a metal look like and what does each part mean?

Stress is force divided by area, this is plotted on the y axis. Strain is extension divided by original length, this is plotted on the x axis. In the process of recording data to plot a stress-strain curve, ...
IH
Answered by Isobel H. • Physics tutor
3297 Views

Why are values of gravitational potential negative?

One way of defining potential is:The GPE per unit massWe define an infinite distance from the centre of our field to have zero potential, this means that energy needs to be provided to an object for it to re...
HT
Answered by Harry T. • Physics tutor
2200 Views

If you have 1.33g of oxygen (Mr = 32) in a container of volume 1000cm^3 at atmospheric pressure (101.3*10^3 Pa), what is the temperature of the gas in Celsius? R=8.314

T=20.2 degrees Celsius. Start by finding number of moles using n=mass/Mr so n=1.33/32=0.0416. Find the volume in m^3 using 1cm^3=1 10^-6 m^3 giving V=1 10^-3 m^3 then rearrange PV=nRT to get T=PV/nR so T=(10...
ET
Answered by Ethan T. • Physics tutor
1724 Views

A cart starts at rest and moves freely down a ramp without friction or air resistance and descends 8 meters vertically, what is its speed at the bottom?

We apply energy conservation. At the start the cart has only gravitational potential energy given by mgh where m is its mass, g is the gravitational field, h = 8m is the height. At the end the cart has only ...
JT
Answered by Joshua T. • Physics tutor
1747 Views