Recent content by cassienoelle

I did draw that's what I just said. " so. My FBD looks like: T upwards with A And Weight downwards, so mg. so T+A = mg but, that didn't work either "

Other than gravity? Um, the acceleration. That's all I can think of. And the mass of the ball.

so gravity is in the vertical direction down. and acceleration is in the horizontal direction straight to the right and mass is at angle theta from the y axis?

Okay so: MEi = MEf m1=8.7 hi=1.09 hf = 0 m2 = 3.9 hi = 0 hf = ? KEi + PEi = KEf + PEf 1/2mv^2 + mgh = 1/2mv^2 + mgh (1/2)(m??1 or 2??) V^2 + m?g0 = 1/2 m? 0 + mgh

so. My FBD looks like: T upwards with A And Weight downwards, so mg. so T+A = mg but, that didn't work either

No one is helping. I have NO IDEA WHAT I'M DOING. I don't understand physics. I don't understand gravity. I DON'T UNDERSTAND ANY OF THIS.

i'm stuck. period. i have NO idea where to even start.

Homework Statement Two masses are connected by a light string that goes over a light, frictionless pulley, as shown in the figure. The 8.7-kg mass m1 is released and falls through a vertical distance of h = 1.09 m before hitting the ground. Use conservation of mechanical energy to determine...

Homework Statement A 7.3 kg object hangs at one end of a rope that is attached to a support on a railroad car. When the car accelerates to the right, the rope makes an angle of 7.8 degrees with the vertical, as shown in the figure below. (attached) What is the acceleration of the...

Homework Statement A box is raised using a rope. If the acceleration of the box, is 5.2 m/s2 (upward) and the tension in the rope is 58 N, what is the mass of the box (in kg)? Homework Equations The Attempt at a Solution I thought T=ma would work, but yeah, it didn't.

Homework Statement An aircraft takes off at 213 km/h after accelerating from rest at 2.86 m/s2. What is the minimum runway length required? Homework Equations The Attempt at a Solution I know it's super simple, but I can't figure it out. I know I have to convert 213km/hr to m/s...

So if M2: T-mg=ma Then T-(4.5)(9.81) = (4.5)(3.09) Then T=58.05 ? And if M1: mgsin20+u-T = ma then m(9.81)(sin20) + .450 - 58.05 = 3.09m so m = 217.35kg but the homework says that's not right.

okay. i guess i just don't understand how to get the equations.

Okay. And w = mg F = ma now what?

M1 T - m1*g = m1*a M2 T + m2*g = m2*a ?