Amerry-go-round modeled as a disk of mass m 1.00 x 10^2 kg and radius r =2.00 m is rotating in a horizontal plane about a frictionless vertical axle with an angular speed of 3.00 rad/s. a kid with mass m 40.0 kg is on the rim of the merry-go-round. (a) find the angular speed of the system if she walks to a point 1.00 m from the center.

Visualize the problem and identify special cases first examine the problem by drawing a picture and visualizing the motion. apply newton's 2nd law, ∑f⃗ =ma⃗ , to each body in your mind. don't worry about which quantities are given. think about the forces on each body: how are these consistent with the direction of the acceleration for that body? can you think of any special cases that you can solve quickly now and use to test your understanding later? one special case in this problem is if m2=0, in which case block 1 would simply fall freely under the acceleration of gravity: a⃗ 1=−gj^.

Consider two less-than-desirable options. in the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. in the second option you are driving 30 mph and crash head-on into a stationary brick wall. in neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. which of these two situations would result in the greatest impact force?

What is the momentum of 70 kg runner traveling at 10 m/s?