Recent content by Sumbhajee

Homework Statement A 10.0 g bullet is fired at 452.1 m/s into a solid cylinder of mass 24.1 kg and a radius 0.37 m. The cylinder is initially at rest and is mounted on fixed vertical axis that runs through it's center of mass. The line of motion of the bullet is perpendicular to the axle...

Homework Statement A thin uniform rod has mass M = 0.31 kg and length L= 0.45 m. It has a pivot at one end and is at rest on a compressed spring as shown in (A). The rod is released from an angle θ1= 57o, and moves through its horizontal position at (B) and up to (C) where it stops with θ2 =...

Homework Statement A spiral spring is twisted from its equilibrium position through θ = 7° by an average torque of 60 Nm. What is its potential energy in Joules? http://schubert.tmcc.edu/res/msu/mmp/kap8/picts/spring2.gif Homework Equations The Attempt at a Solution I am not...

Homework Statement A spool of thin wire (with inner radius r = 0.45 m, outer radius R = 0.60 m, and moment of inertia Icm = 0.91 kg*m2 pivots on a shaft. The wire is pulled down by a mass M = 1.35 kg. After falling a distance D = 0.52 m, starting from rest, the mass has a speed of v = 79.900...

I actually have a similar problem that I am having trouble with. I am not fully understanding the concepts you presented in the last post. What do mean you by saying that CaptFormal "equated the 2"?

Homework Statement Calculate the impulse (in kg m/s) received by a football when it is kicked in a kickoff. The ball has a mass of 0.259 kg and travels a horizontal distance of 46 m. The ball is kicked at an angle of 47 degrees with the horizontal...

I was able to find the answer! Thanks for the tips!

I found the answer! Thank you for all the help.

I have found potential energy at the top of the system (Pe=mgy). I have also found kinetic energy at the lower point (Ke=.5mv^2). It would make sense to take the difference, but I have already tried this method.

To set up the equation would I use the following: 9.80=V^2/7.55 and solve for velocity? But how do you convert velocity to revolutions per minute?

If you are weightless at the top you should have mass * gravity acting down and a centripetal force equal to gravity acting up. But how does this information help to discover revolutions per minute?

I know that Centripetal acceleration = (velocity)^2/radius

Homework Statement A 25.0 kg child slides down a long slide in a playground. She starts from rest at a height h1 of 19.00 m. When she is partway down the slide, at a height h2 of 6.00 m, she is moving at a speed of 9.10 m/s. Calculate the mechanical energy lost due to friction (as heat, etc.)...

Homework Statement How many revolutions per minute would a 15.1 m diameter Ferris wheel need to make for the passengers to feel "weightless" at the topmost point of the trip? Homework Equations The Attempt at a Solution I assume this problem has something to do with finding...

Homework Statement These are all true/false questions. 1. The acceleration of an object is same in all inertial reference frames. 2. The work required to lift a mass one meter depends on the speed at which it is raised.. 3. The work done by a constant force acting on an object is...