In the standing waves experiment, the string has a mass of 31.2 g and a length of 0.7 m. the string is connected to a mechanical wave generator that produce standing waves with frequency of f. the other end of the string is connected to a mass holder (mholder = 50.0 g) that carries a weight of 5.00x10^2 g. calculate the linear density of the string.

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