Homework Statement
So during collisions between 2 point masses, I know that momentum is always conserved, but energy may or may not be conserved.
Now, in this case, where we have a block colliding with a pivoted rod, I know that angular momentum is always conserved, but neither energy or...
Then, why, when integrating the sphere, it is ok to ignore the curved area? And the 1/2, it is right because we are summing the moments of each individual disk, which is 1/2 MR^2
Homework Statement
Find the moment of inertia of a spherical shell (hollow) with mass M and radius R.
Homework Equations
## I = \int r^2 dm ##
The Attempt at a Solution
This is method I use to find Moment of Inertia of solid sphere:
We use circular cross sections.
At some radius r...
If I go 1 mile at 10 miles/hr and then go 1000 miles at 1 mile/hr, the average velocity would obviously be very close to 1, where the majority of your time is spent. Using your method, it would be (11+1)/2 = 5.5, clearly wrong. Taking the average only works when the times taken are the same...
Homework Statement
Homework Equations
F = ma
The Attempt at a Solution
When drawing a FBD for block 1, I couldn't figure out if the friction force between the blocks was toward the left or toward the right. Similar situation on block 2. How would I determine this?
Homework Statement
2. Homework Equations
Elastic collision: KE conserved
The Attempt at a Solution
I don't think there's really anything to work out...why would the 2M block move right as well?
Homework Statement
Homework Equations
W = Torque * distance
3. The Attempt at a Solution
The net torque is 8*.09-11*.06 = .06, and the distance moved is 4pi, because 2 full rotations, but this is not one of the choices...