Recent content by pokeefer

The title says it all. Please be detailed, the question is 6 marks. Thanks.

Homework Statement a.) What is the operational definition of an ampere? b.) What is the definition of an ampere in terms of a flow of electrons past a point in a wire? c.) What is the advantage of the operational definition over the definition in (b)? Homework Equations N/A...

Relationship between accelerating voltage and distance in cathode ray tube? I really need help. I'm going to re-take a test that involves questions about a Cathode Ray Tube that shoots electrons in between two deflecting plates that have a flourescent screen at the end of them. First it...

Homework Statement I'm currently doing Physics 12. Its about electric fields, voltage, current, power, gravitation field and series, parallel and series-parallel circuits. I've already taken the test once and got 48% because I didn't fully study the last section which involved...

So would I do something like this? V = Energy Potential / Q V = Energy Kinetic / Q 5,000 v = Energy Kinetic / (1.6 x 10^-19) Then to find velocity you do: Energy Kinetic = 1/2 mv^2 And in the mass you put the mass of the proton (1.67 x 10^-27) ? Just want to make sure.

Homework Statement Protons are being accelerated through a potential difference of 5,000 V in the gun of a particle accelerator. They must pass between two parallel deflecting plates that are 0.06 m long and 0.02 m apart with a potential difference between them of 1,500 V Homework...

Homework Statement (4 marks) Instruments that measure the force of the Earth's gravity with great accuracy are carried in airplanes over mineral-bearing landscapes. Explain how readings on the instruments indicate when there is a deposit of minerals or oil below the plane. Homework...

That did not help me much at all. I feel like i don't have enough given information to work with on these questions.

Homework Statement Question 1: What speed must a satellite have to orbit the Earth at a distance 7.8 x 10^7 m/s from the Earth's centre, where the acceleration due to gravity is 0.065 m/s^2? Question 2: An object orbits the Earth at a constant speed in a circle of radius 6.38 x 10^6 m...

Homework Statement Here is a diagram: http://i55.tinypic.com/k18g14.jpg A ball of mass 0.75 kg on the end of a cord is swung in a circle of radius 1.5 m with a period of 1.5 s as shown in the diagram. a.) What is the speed of the ball? b.) What is the acceleration of the ball? c.) What...

This is depressing me so much. I'm on my own and I have no teachers to help me at all. I'm doing online school and I'm spending hours trying to figure out what iv'e done wrong. :( I have a very limited time now to finish this homework assignment and get through all the other assignments before...

I'm really confused now. How would I go about calculating the net torque? What value does it want me to give it? Aren't I supposed to solve for F2, isn't F2 the torque? I'm sooo confused :( Is it Net T = -(1m)(2352N) + (3.2m)F2 = 0 OR Net T = -(1m)(2352N) - (2.2m)(2352N) +...

For part C, This is what I have so far. Since the mass of the beam is negligible: 2352N = F1 + F2 (2352N)(2.2m) + (2352N)(1m) = F1(3.2m)I'm trying to solve for Force 2 which is at the right end.

Ok thanks, Now I am just halfway through part c and a bit stuck. And I don't know how I would go about part d :P

Homework Statement Im doing Physics 12 with equilibrium The diagram shows a beam 3.2 m long with masses hanging from it. The mass of the beam is negligible in comparison with the other masses. Diagram: http://i51.tinypic.com/jjb449.jpg a.) If the beam is in equilibrium, what is the...