Recent content by Lnewqban

I am not sure about that answer, songoku. Is it the official correct one?

Energy not only exists, it is very expensive! :oops: Many poor countries are supplying electrical energy to their populations only a few hours each day. If while driving a vehicle, you ever run out of fuel in the middle of nowhere, and have to push that vehicle a few meters or feet, you...

If you draw a diagram with very different radii, you could easily see the right answer. Also, for answering (i), draw the radius that are perpendicular to the tangents for each circle.

Please, consider that for initial conditions: Pressure at B should be equal to Patm (the bottom piston is at balance). Pressure at A should be less than pressure at B (with the help of the stretched spring, the top piston is pulling the weight of the water column underneath it).

That is the whole point of the rotation, to have two very different relative velocities on both sides. As the rotating body deflects the airstream to one side, the airstream pushes it in the opposite direction.

That static friction impedes any relative sliding of the rope over the pulley (it simplifies the problem as tangential velocities of rope and pulley are equal), but it does not consume any energy or interferes with the acceleration of the system. High friction in the shaft or axle of the pulley...

Could you show the correct answer? Because the fluid is incompressible, the new force on the spring will be the addition of the weight of the block plus the unchanged weight of the water. Our problem is that we don't know the value of the former. Could you draw four FBD's for the pistons in...

As described in the problem, we start with two orthogonal components (12 N and 4 N) of a force vector, which has magnitude 12.65 N and direction 18° from horizontal. That is the actual initial force acting on the particle. At the time when the trajectory ends, we have two orthogonal components...

We are all here to help you understand, all you need to do is to keep asking questions until you deeply understand any subject. A pulley is nothing more than many levers sharing a common pivot point.

Welcome, @aasnrsd ! It seems to me that the last equality is not correct regarding units (force/pressure). Besides, that angle is fixed and determined by the geometry of the system formed by the three identical particles (of cylindrical or spherical shape). Consider that for any change in...

Welcome, @withoutname ! Not all metal are attracted by a magnet. Alloys based on iron, like the materials used in common magnets, respond the best. Copied from: https://en.wikipedia.org/wiki/Magnetism "A ferromagnet, like a paramagnetic substance, has unpaired electrons. However, in addition...

It seems to me that you are not. I am not sure about the rigidity of the "3" schedule 40 steel for the top horizontal bar". How wide apart will the vertical posts and the swings be?

Some more details into inflatable sails for small boats: http://inflatedwingsails.com/en/concept/

Excellent catch, Steve! Just corrected it. Thank you very much.