Test corrections!
Homework Statement
1.) a railroad car of mass m is moving with speed v when it collides with and connects to a second railroad car of mass 3m, initially at rest. how do the speed and kinetic energy of the connected cars compare to those of the single car of mass m before the...
i did the KE+KE=KEf+KEf
I ended up with basically the same thing only the magnitude is squared. would the first ball come to rest and give ball 2 all its energy? that would mean that ball 2 would have a vfinal of 5.7 m/s. would that work? I am studying for a big test monday in AP Physics and...
Homework Statement
Two billiards balls of equal mass move at right angles and meet at the origin of an xy coordinate system. One is moving upward along the y-axis at 2.0 m/s, and the other is moving to the right along the x-axis with speed 3.7 m/s. After the collision( assumed elastic), the...
ok so i drew this and i get that the r is what's left of the length of the string after it hits d. r is also the radius of the circle that the bob makes when it makes one revolution. i don't understand how to get either one of them.
L=1/2r+2r
L=3/2r
0.44=3/2r
r=0.2933333
i guess this is...
Homework Statement
i need to calculate the d for a 45 degree drop of pendulum that the length is .44m. i did the one for 90 degrees but i can't figure out how to get a different outcome.
Homework Equations
ug initial= KE + Ug final
mgh=0.5mv^2=mgh
gl=0.5rg+g2r
l=0.5r+2r...
Homework Statement
Derive an expression for Vmin, the minimum speed the ball can have at point Z without leaving the circular path.
Homework Equations
V≤(x/t)
V≤(2∏r)/(t)
V=√(GM1)/(r)
The Attempt at a Solution
I set 2∏r = to x since its in a circle. i then had V≤(2∏r)/(t)
then...