Math Hw HELP?

a small block of mass m slides along a friction-less loop-the-loop track. At what height above the bottom of the loop should the block be released so that it is on the verge of losing contact with the track at the top of the loop

Popular: How to calculate allele frequency? Solve for x: x+h=y? Which of the following are true about the reactant quotient? Im needing help on one of my test? Is it cheaper for a party of 4 if I pay all Together?
More: A cyclist travels 56 miles in 4 hours. Use dimensional analysis to convert the cyclist's speed to feet per second.? If I took a my way pill today could I take one tomorrow? What is the frequency of light waves with wave length of 5x10^-7? Biology question? Is the reflectivity of and object affects the index of refraction of an transparent glass (ex. wine glass)?