Recent content by kevinli

Homework Statement A ball with a mass of 2kg is trown off a cliff 30m high and hits the ground with a momentum of 110 kg*m/s^2. What is the acceleration of gravity pulling on the ball? Homework Equations F=ma and I'm not sure what else. The Attempt at a Solution I probably messed...

Homework Statement A characteristic property is a property that can be used to help identify a substance since it is the same for all samples of the substance. We have now studied mass, volume and density. Which of these is a characteristic property of substances? Explain. Homework...

Is it at least possible to have a estimate. I mean, I am sure the total volume is less b/c of the air spaces but I cannot do the experiment again.

Homework Statement Ok, so, I did a experiment in school and I was supposed to find the volume of gravel + water in a graduated cylinder. However I found the mass of the gravel, cylinder instead. I also know the amount of water and gravel I put in the graduated cylinder. Can someone please help...

Please help! Easy motion question! Homework Statement Please explain these steps to me. My physics teacher went too fast :( v=a*t d=v*t d=(a*t)*t d=at2 Vaverage=Vf/2 =1/2Vf d=1/2Vf*t d=1/2at2 Thank you for your help Homework Equations v=a*t ->...