Two carts, A and B, are connected by a rope 39 ft long that passes over a pulley P (see the figure). The point Q is on the floor h = 12 ft directly beneath P and between the carts. Cart A is being pulled away from Q at a speed of 3.5 ft/s. How fast is cart B moving toward Q at...
March 8, 2012
find y" by implicit differentiation. 4x^3 + 3y^3 = 4 ===================================== 4x^3 + 3y^3 = 4 12x + 9yy' = 0 24x + 9(2yy')y' + 9y^2(y") = 0 y" = -6[4x-3y(y')^2] answer. (it this right? )
February 25, 2012
A model for the length of daylight (in hours) in Philadelphia on the t th day of the year is L(t)= 12+2.8 sin[2pi/365(t-80)] Use this model to compare how the number of hours of daylight is increasing in Philadelphia on March 21 and May 21. (Assume there are 365 days in a year...
February 20, 2012
What is the equilibrium partial pressure of water vapor above a mixture of 37.5 g H2O and 62.5 g HOCH2CH2OH at 55 degree C. The partial pressure of water at 55 degree C is 118.0 mm Hg. Assume ideal behavior for the solution.
February 19, 2012