Recent content by helen3743

Sum of external forces = 0! thank you!

Thank you-- Problem: A 50 kg boy runs at a speed of 10 m/s and jumps onto a cart. The cart is initially at rest. If the speed of the cart with the boy on it is 2.50 m/s, what is the mass of the cart? I don't know what to do. This probelem seems very simple but I don't know where to start...

Hmm.. So I'm guessing it would be just 470N...? Thanks again!

Thanks in advance-- Problem: A woman who weighs 470 x 10^2 is leaning against a smooth vertical wall, as the drawing shows. a) Find the force FN (directed perpendicular to the wall) exerted on her shoulder by the wall. b) Find the horizontal component of the force exerted on her shoes by...

I also need help how to start his problem: "By accident, a large plate is dropped and breaks into three pieces. The pieces fly apart parallel to the floor, with v1 = 3.10 m/s and v2 = 1.60 m/s. As the plate falls, its momentum has only a vertical component, and no component parallel to the...

Ok. I need help in how to even just start this problem. "Starting with an initial speed of 5.00 m/s at a height of 0.280 m, the 1.75 kg ball swings downward and strikes the 4.75 kg ball that is at rest. a) Using the principle of conservation of mechanical energy, find the speed of the 1.75...

oooo.. makes sense. Thank you!

Hello, thank you for helping. My Question: On a banked race track, the smallest circular path on which cars can move has a radius r1 = 107 m, while the largest has a radius r2 = 163. The height of the outer wall is 18 m. Find the smallest speed and largest speed at which cars can move on...

A cup of coffee is sitting on a table in an airplane that is flying at a constant altitude and a constant velocity. The coefficient of static friction between the cup and the table is 0.30. Suddenly, the plane accelerates, its altitude remaining constant. What is the maximum acceleration that...