Recent content by 9danny

If a magnetic force does no work on a charged particle, how can it have any effect on the particle's motion? Are there other examples of forces that do no work but have significant effect on a particle's motion?

Why does an electric light bulb nearly always burns out just as you turn on the light, but almost never while the light is shining? :confused:

I would think that a point near the axis would have more angular velocity at the beginning.. but does this means that for all the point in the object to have the same angular velocity and angular acceleration they'd have to be rigid?

Does a body rotating about a fixed axis has to be perfectly rigid for all points on the body to have the same angular velocity and the same angular acceleration? Why? :bugeye:

also related to rotational motion... a concept that I can't grasp entirely... can a simple force applied to a body change both its translational and the rotational motion? I thought they were the same thing...

What is the difference between tangential and radial acceleration for a point on a rotating body? :rolleyes: *** Also, and this is mainly for a personal inquiry trying to get a "physics-oriented" answer... I've noticed that the lower the tire pressure the greater the contact area between...

Is R_x^2 = F_x^2?? Where am I solving for the angle? What is F? From R^2 = R_x^2 + R_y^2 I find that R_x = R_y... therefore R^2 = 2R'^2 Solving --> R' = (sqrt)1 Am I right?

The first one. The resultant = sqrt2 F HELP

How can I show my work? Fx/R = cos(angle) then solve for angle gives me 45deg Fy/R = sin(angle) gives me 45deg -- then what? add them?

eng physics - help needed! I have three simple problems that - even though I understand - I can't get the answer the book is saying... 1) Two forces with same magnitude F. What is the angle between the vectors if their sum has a magnitude of (sqrt)2F. ** ok - I'm doing R = (sqrt)2F...