Recent content by Visual1Up

Hey, I have the following problem: A car going 15m/s is brought to rest in a distance of 2.0m as it strikes a mound of dirt. How large an average force is exerted by the seatbelts on a 90kg passenger as the car is stopped. I have found one formula... F = (mass * change in velocity)/time...

I am not sure I follow exactly, could you explain some more? Thanks!

Need some suggestions... I have a banked airplane at theta degrees, with a radius, and velocity. What is the formula for finding lift force. Fc = Fn sin theta I believe, but that's the only formula I am aware of. Thanks!, -Mike

Can someone start me in the right direction? Radius = 105ft length = 30 ft height = 4ft theta = ? best velocity = ? I am guessing I use ... tan(theta) = v^2/rg ... v = sqrt(rg tan(theta)) But the empty theta confuses me, and I am not sure how the length even fits in, thanks!, -Mike

ah, I see. v = rw does seem a lot more simple than what I did though

Well one rev is always 2pi, so 2pi/360s ... I am unsure of how to convert that. I found one solution that tells me to use C = 2(pi)r and v = d/t, so d = 2(pi)(2600m)... so v = 2(pi)(2600m)/360s ... v = 45.4 m/s? Is this the best way to do the problem or am I making it too complicated?

I am confused on how to find m/s in the following problem: r = 2.6km one revolution of circle = 360s I need it for ac = v^2/r Thanks!, -Mike

ahhhh I forgot to factor out a t :frown: ok I got 6.46. It seems like the math does me in more than the formula's. But thank you very much for the help.

Well with rsk's problem, I can't ever arrive at the right answer because the math is killing me. I have never seen zeno's problem before but when working I get vo = .649 and time = 7.5 sec which can't be right. I am horrible at this :(

oh, so are you saying... 0 = v sin 35 - (1/2)g * (4/(v sin 35))^2 ? EDIT: v cos 35 on the right

I think I understand, your saying the equation turns into y = 1/2gt^2? since voy = 0. but when working that I get 42 m/s and t = .1 . That can't be right. :rolleyes: . Excuse me if I am missing something, I am having a hard time with physics.

I am having some trouble with projectile motion, I do fine when I have all of the variables such as initial velocity, and angle, and say I want to find the range. That's great, I use y = voyt - 1/2 gt^2 where y = 0 to find the time, since voy = vo sin theta, and r = voxt where vox = vo cos...