Recent content by aziiri

Homework Statement A solid object of 6kg was moving at a constant speed of 10m/s towards a man who try to stop it. If the man stopped the train in 30 seconds, find the force F that the man exerted on the object. The Attempt at a Solution The only force acting on the object is the man's...

Oh, thanks a lot. T is the tension and P is the gravity: Vertically : T sin(30°)=P. Horizontally : T Cos(30°)= m a. Using the first equation, we have : m g tan(30°)=m a, which means that : a=g tan(30°).

I'm sorry but I can't do it, I stuck with the first steps (drawing the forces), I really appreciate that someone give me the forces.

You mean that I should change my inertial reference frame ? I think I omitted the tension of the chord. Can someone please give me the first steps ! this problem is killing me.

The weight and the force of plane's acceleration, I guess ! ! it is zero because the ball is constant with respect to the plane, Should I take the Earth as my reference so the ball is moving ?

Homework Statement a ball was hanging by an inextensible string to a small airplane. firstly, it was hanging straight down but when the pilot started the motor the string made an angle of 30 degrees wrt the vertical. Assuming that the ball is a point mass, find the acceleration (m/s²) of...

Homework Statement A battery with constant voltage of 4V and 2 A-h, find the energy (in jouls) stored in the battery when it is fully charged. Homework Equations A-h=3600 C 1 Joule= V*C. The Attempt at a Solution We have 2A-h=7200 C, and Joules are volt-couloumb, so we multiply to get that...