Recent content by Supernejihh

I can kinda understand what you are saying, but the equation is somehow in the book. In the book's example, they found the work done by the force to be 20J. They wanted to find the increase in E thermal. They used W = E mec + E thermal => E thermal = W - E mec. The work was 20J and the E...

Homework Statement I ask this because my initial assumption was that work done by a non-conservative force (friction in this case) is also equal to thermal energy. However, in my book, it gave an equation with W = Emec + E thermal. They also had an example where they added up the work and...

Thanks for your help Doc. I really appreciate it.

Doc Al. So what you are telling me is that the Work of +4.0J is caused by me. And its positive because the direction and force are directed towards one way. But the force of a spring is always opposite the displacement. So the work of the spring is -4.0J because its moving one way, while the...

The problem is that, that is how the book presented us with the equation. It was initial minus final. I understand where you are coming from, but that's how it is.

Homework Statement We must apply a force of magnitude 80N to hold the block stationary at x = -2.0cm. From that position, we then slowly move the block so that our force does +4.0J of work on the spring-block system; the block is then again stationary. What is the block's position? (Two...

Homework Statement If a car goes around a curve, which direction is its friction? Pointed towards the circle or outwards? Explain please. Thanks in advance. Homework Equations The Attempt at a Solution

Homework Statement A puck of m = 0.20 kg has F1 of 1N directed -30° and F2 of 2N directed to the West. What is the acceleration? I've dealt with these problems before by finding the vector components of the angled force and adding it to the other forces. This meant i took into account both...

So i don't take into account the y direction when it's pointing into the ground, but I do if it's pointing out of the ground?

When the circle is below you, Fn - mg - Fc = 0. Where Fn is normal force and Fc is centripetal force. Fn - mg + Fc = 0 when the circle is above you.

Homework Statement Only two horizontal forces act on a 3.0 kg body that can move over a frictionless floor. One force is 9.0N, acting due east, and the other is 8.0N acting 62° north of west. What is the magnitude of the body's acceleration. Okay I know the answer is 2.9m/s^2. It is from...

Thanks nasu. Much appreciated

Homework Statement A 3.5 kg block is pushed along a horizontal floor by a force F of magnitude 15 N at an angle of 40 degrees DOWNWARD. The coefficient of kinetic friction between the block and the floor is 0.25. My question is about the normal force. I know the normal force is given by...