Part 1: Assume that the North American continent can be represented by a slab of rock 4400 km on a side and 29 km deep and that the rock has an average mass density of 2900 kg/m³. The continent is moving at the rate of about 4.2 cm/year. What is the mass of the continent?
Answer in units of kg.

Part 2: What is the kinetic energy of the continent?
Answer in units of J.

Part 3: A jogger (of mass 73 kg) has the same kinetic energy as that of the continent. What would his speed be?
Answer in units of m/s.

Amass m = 74 kg slides on a frictionless track that has a drop, followed by a loop-the-loop with radius r = 18.4 m and finally a flat straight section at the same height as the center of the loop (18.4 m off the ground). since the mass would not make it around the loop if released from the height of the top of the loop (do you know why? ) it must be released above the top of the loop-the-loop height. (assume the mass never leaves the smooth track at any point on its path.) 1. what is the minimum speed the block must have at the top of the loop to make it around the loop-the-loop without leaving the track? 2. what height above the ground must the mass begin to make it around the loop-the-loop? 3. if the mass has just enough speed to make it around the loop without leaving the track, what will its speed be at the bottom of the loop? 4. if the mass has just enough speed to make it around the loop without leaving the track, what is its speed at the final flat level (18.4 m off the ground)? 5. now a spring with spring constant k = 15600 n/m is used on the final flat surface to stop the mass. how far does the spring compress?