3.5-m-diameter merry-go-round is rotating freely with an angular velocity of 0.78 rad/s . its total moment of inertia is 1710 kg⋅m2 . four people standing on the ground, each of mass 66 kg , suddenly step onto the edge of the merry-go-round.
a. what is the angular velocity of the merry-go-round now?
b. what if the people were on it initially and then jumped off in a radial direction (relative to the merry-go-round)?

Explain to someone who knows nothing about fossils the study of invertebrate paleontology and how it scientists understand the history of the earth. be sure your explanation contains a minimum of two complete sentences.

Which of the following is an example of units for speed

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?