Four objects are released from the top of a hill of height H and roll to the bottom: a hoop, a hollow sphere, a solid sphere, and a solid cylinder
Each object has a mass M and a radius R.
Which of the following gives the order in which they reach the bottom of the hill, from first to last?

How is coal extracted from mountaintop removal mines? a. dynamite is used to create underground tunnels where miners go to extract the coal. b. dynamite is used to break apart rocks and then draglines are used to remove the broken rock and reach the coal. c. coal in mountaintops is extracted by digging strips in the landscape to reach the coal. d. placer deposits in mountain river bottoms are removed by

On mars a rock falls an unknown vertical distance from a resting position and lands in a crater. if it takes the rock 2.5 seconds to fall, how high is the cliff the rock fell from? mars' surface gravity is 3.8 m/s2. a. 9.5 m b. 11.9 m c. 15.2 m d. 23.8 m

You can melt ice by applying pressure because the solid/liquid line has a slope.