The small box is started with an initial tangential velocity of 9.4 m/s in the direction towards to top of the spherical dome at an initial angle of 39 ◦ with other conditions the same. find the critical angle at which the box leave the surface of the dome. answer in units of ◦ .

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.