Recent content by nx01

Thank you!

Thank you!

Homework Statement A 2.4kg ball falling vertically hits the floor with a speed of 2.5m/s and rebounds with a speed of 1.5m/s. The impact or "collision" described in this problem is: a. completely elastic b. completely inelastic c. elastic d. inelastic 2. The attempt at a solution...

Homework Statement A merry-go-round of radius 2m has a moment of inertia 250kg*m^2, and is rotating at 10rpm on a frictionless axle. Facing the axle and initially at rest, a 25kg child hops on the edge of the merry-go-round and manages to hold on. What will be the new angular velocity of the...

Thanks!

Ah, I wasn't squaring the seconds unit when converting. Thanks!

Hi hjelmgart, Thanks for your reply. I'm pretty sure that my error lies in the unit conversion - did you do what I did in the conversion in the original post, or something else?

Homework Statement A rocket which has an exhaust speed of 8.0 km/s is to have a vertical acceleration of 8.0 m/s2. If the initial mass of the rocket is 6.0x106 kg, at what minimum rate must the rocket consume fuel? Homework Equations F = ma F = RVREL The Attempt at a Solution F...

Homework Statement A phonograph turntable with an initial angular velocity of 78 rpm continues turning for 40 rotations after being switched off. What is the angular deceleration of the turntable? Assume constant angular deceleration. Homework Equations \alpha=(\omega-\omega0)/t...

I've got the answer :) For anyone who might come across this post in the future: Ty=Fg=mg=2*9.8=19.6=Tsin120 So T=22.63 |Fpull|=|Tx|=|Tcos120|=|-11.3|=11.3

Oops, I meant 120. I've attached a picture (.jpg) showing how I calculated the angle. Thanks for your responses so far!

If the ball is 30o from the vertical to the right, then T is oriented 130o from the positive direction of the x-axis. Then Tx =Tcos130, and Ty=Tsin130?

Hi all, thanks for your input. Is it right to assume that the force of gravity = the y component of the tensional force, and that the force applied to the ball = the x component of the tensional force? If so, how can I calculate Tx without knowing the magnitude of T? (If my assumptions are...

Homework Statement A 2.0 kg pendulum ball is pulled 30° from the vertical by a horizontal force Fpull. What is the magnitude of Fpull? Homework Equations F=ma The Attempt at a Solution I'm rather lost with this one - I'm not even sure how to classify it. Any help at all - even a point in...

Thank you :)