The radius of the tuning peg is 1.0 mm. initially, there is no tension in the wire, but when the tuning peg is turned, tension develops. find the tension in the wire when the tuning peg is turned through two revolutions

Find the volume of the ellipsoid x^2+y^2+5z^2=36.

Will you chech and finish these for me, because i am stumped with them.

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s