Recent content by astr0

The system shown in the figure below consists of a mass M = 4.3-kg block resting on a frictionless horizontal ledge. This block is attached to a string that passes over a pulley, and the other end of the string is attached to a hanging m = 1.6-kg block. The pulley is a uniform disk of radius 8.0...

Should I use two separate integrals, then add them together?

Show by integration that the moment of inertia of the plate about an axis that is perpendicular to the plate and passes through one corner is \frac{1}{3}m(a^{2}+b^{2}) I'm not sure at all how to approach this problem. I know that the moment of inertia is \int r^{2}dm but how do I use that in...

Then I'm not sure I understand it.

The time in the frame of reference that is outside of the muon.

The proper mean lifetime of a muon is 2.20 µs, which is denoted as τ. Consider a muon, created in Earth's upper atmosphere, speeding toward the surface 8.00 km below, at a speed of 0.980c. What is the likelihood that the muon will survive its trip to Earth's surface before decaying? The...

Our class doesn't have a TA, the professor does all of the grading.

The second part of the problem states At x= 2.0 m the force points opposite the direction of the particle's velocity (speed is 12 m/s). What is its speed at 3.8 m? If the force points opposite, shouldn't the particle be slowing down?

I realize that now.

I understand now. I wasn't making the connection. Thanks.

My professor does have office hours, and he is infamous for turning students away. His reply to questions is usually along the lines of, "I'm sure you'll figure it out if you think about it more." He doesn't offer help, and usually doesn't look away from his computer screen while talking.

Work = \int F*dx Which gives \frac{1}{2}F^{2} But how does that help me?

A force acts on a particle of 1.6kg mass, the force is related to the position of the particle by F=0.5x^{3} Find the work done by the force as the particle moves from x=3.8 m to x=2.0 m. By plugging each value of x into the force equation I get that: F at 3.8 m = 27.436 N F at 2.0 m =...

My biggest obstacle is that I have no one that I can ask questions about problems that I am having trouble with. The professor doesn't care about the students, and there is no physics tutoring at the university I attend. When I get stuck I just get frustrated.

I am a undergrad physics major taking my first calculus bases physics course. I am having trouble with Mechanics, which is a main topic of this course. I understand the basic equations, but I find that the problems we are given for homework and on tests involve finding different and combined...