Recent content by Chrisleo13

When it is 10:00, the hour hand on an analog clock is 300 ahead of the minute hand. How many minutes elapse (to three significant digits) before the minute hand next points in the same direction as the hour hand? I seems really easy, but for some reason I am not getting the right answer...

I got it, thanks. I was plugging in the wrong mass. Thanks a lot though.

I plugged that equation into the first equation and when I canceled everything, I got m2v2cos(theta)s to cancel because 1 is negative and 1 is positive.

Well, I may have it. I have one try left on my homework. I drew it out and found that it would be the opposite of what I said previously.

I did 13.9 m/s / 21.0 m/s tan-1() then I should subtract that angle from 270 or 180?

Ahhhh, why didn't I think of that before. I got it. The angle still is unclear. Can I just take the tan of the two velocities?

Alright, I think I solved one equation right to plug into the other. I solved the first one m1vix = m1vfx1 + m2vf2 vix = m1vfx1 + m2vf2 / m1 Am I on the right track?

Hmm, sorry for keep bothering you but I seem to miss the problem when I work it like that. I got 82.96 when I added m1v1 to m2v2 then I divided it by 4.9 to find the speed. But that's not correct.

Hmm, I think I understand, but the unit vectors aren't given. Do I have to find them using the speeds?

Ok, I understand that but what is x and y in that equation? m1v1(x) + m2v2(y) what are the x and y variables here?

An artillery shell of mass 10.00 kg, lying at rest on the ground, accidentally detonates, exploding into three pieces of shrapnel. One piece of mass 1.70 kg is flung in the -x direction at 21.0 m/s, while a second piece of mass 3.40 kg is propelled in the -y direction at 13.9 m/s. Determine the...

Hmm, I should solve for something in the the X direction because in the Y direction Vi = 0. Are there two separate ones for each Puck? For the final speed of A and B?

vf - vi / t = a I did that and didn't get it right when I plugged it into F= ma.

Thanks for the help, but I still have the equations wrong I guess. I understand what to do, but I guess I am setting them up wrong. If you could help me with that I would appreciate it. Thanks

A 425 g ball with a speed v of 6.5 m/s strikes a wall at an angle of 30° and then rebounds with the same speed and angle. It is in contact with the wall for 9.0ms. (a) What is the impulse on the ball (take positive as down in the figure)? b. What is the average force exerted by the ball on...