# Search results

1. ### The Rutherford experiment

The Rutherford experiment An alpha particle (a helium nucleus, containing 2 protons and 2 neutrons) starts out with kinetic energy of 10.2 MeV (10.2 106 eV), and heads in the +x direction straight toward a gold nucleus (containing 79 protons and 118 neutrons). The particles are initially far...
2. ### Force Average

Homework Statement A tennis ball has a mass of 0.057 kg. A professional tennis player hits the ball hard enough to give it a speed of 52 m/s (about 117 miles per hour.) The ball moves toward the left, hits a wall and bounces straight back to the right with almost the same speed (52 m/s). As...
3. ### Net Force Question with no velocity or time given.

Is gravity -9.8 N? If it is then that should be the answer right?
4. ### Net Force Question with no velocity or time given.

You have gravity acting on the ball as well, and that's it. The gravity is pulling the ball down in the y direction. Would it be gravity? Or the weight plus gravity?
5. ### Net Force Question with no velocity or time given.

[SOLVED] Net Force Question with no velocity or time given. Homework Statement A ball of mass 0.6 kg flies through the air at low speed, so that air resistance is negligible. What is the net force acting on the ball while it is in motion? Homework Equations Fnet = m(change in...
6. ### What is Fnet?

Thank you very much Doc. I solved the equation thanks to your help and now know what Fnet is. You are awesome.
7. ### What is Fnet?

Actually I was not. That link for impulse might help me out. The force average is the mass(change in velocity)/(change in time). The question is as follows:(took out number, substitiued x so you can't solve it for me so i can try to figure it out) You were driving a car with velocity...
8. ### What is Fnet?

Thank you Doc Al for replying. Momentum is p = (gamma)(mass)(velocity) Having said that I still don't understand how to compute Fnet given two vectors, a mass, and a time. I would just like to know how to compute the net force, Fnet, given the circumstances.
9. ### What is Fnet?

[SOLVED] What is Fnet? I am given a problem with an initial velocity then a final velocity, the weight and how long it took to change that velocity. They want us to get the change in momentum, but I don't know how to compute the Fnet to use in the equation. Any suggestions on the steps I should...