Aball of mass 24.1 g is attached to a cord of length 0.417 m and rotates in a vertical circle. what is the minimum speed the ball must have at the top of the circle so the cord does not become slack? the acceleration of gravity is 9.8 m/s².
answer in units of m/s.

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.