A football is kicked from ground level with an initial velocity of 20.4 m/s at angle of 55.5° above the horizontal. How long, in seconds, is the football in the air before it hits the ground? Ignore air resistance.

Let f(x) = x4- 8x2 . find the relativeextrema of this function using the second derivative test.

Atorque acting on an object tends to produce a. equilibrium b. rotation c. linear motion d. velocity e. a center of gravity

Asquare isothermal chip is of width w=5 mm on a side and is mounted in a substrate such that its side and back surfaces are well insulated; the front surface is exposed to the flow of a coolant at tinf=15 °c. from reliability considerations, the chip temperature must not exceed t=85 °c. if the coolant is air and the corresponding convection coefficient is h=200 w/m2 x k, what is the maximum allowable "power" of the chip? if the coolant is a liquid for which h=3000 w/m2 x k, what is the maximum allowable power of the chip?