Recent content by doug1

The notation [N30E] means 30 degrees east of north for example. Momentum is conserved in this question, but energy is not

Homework Statement A truck (4 000 kg) runs a red light and enters an intersection traveling at 81 km/h [E]. The truck collides with a car (2 000 kg) that was traveling at 54 km/h [N20oW]. Immediately after the collision the truck was traveling at 60 km/h [N 30o E]. Determine the velocity...

After it leaves the track the only force acting on it is gravity. Would I do: mg = mv^2/R g = v^2/R R = v^2/g Plug in v^2 = 2g(R-h) R = 2g(R-h)/g R = 2R - 2h R = 2h How do I find the angle then?

Homework Statement http://imgur.com/ZGvC1 At what angle does the cart fly off of the track? No other information is provided Homework Equations I know that energy is always conserved (total energy before = total energy afterwards). The Attempt at a Solution Equation for...

Homework Statement You take a bathroom scale onto a stand-up rollercoaster (the riders are always in a standing position). Before the ride starts, you stand on the scale and note that it reads 65 kg. The ride starts and at the top of the first loop you are upsidedown and your scale reads...

Homework Statement You are driving home from the cottage and pulling a trailer behind your car. There is a steep hill with a 12 degree incline that you must drive up. You read the instructions for the trailer hitch which keeps the trailer attached to your car. The hitch can withstand...

Homework Statement Three boxes are stacked, one on top of the other. The mass of the top box is 4kg. The mass of the middle box is 3.5kg. The mass of the bottom box is 3.0kg. What is the force exerted by the middle box on each of the other boxes? Homework Equations Fg = mg The Attempt at a...

Homework Statement Two masses, measuring 800g and 400g respectively, are attached to spring scales and an Atwood Machine. What will the reading of each scale be? https://www.physicsforums.com/attachments/52223 Homework Equations Fg = mg The Attempt at a Solution I think that...

Homework Statement You are given a length of rope, tape and five rocks. The rocks must be attached in such a manner that when the rope is released, the sound of each rock hitting the ground is evenly spaced. There must be a rock at the very bottom and the very top of the rope. When the...