You lift a 100 N boulder 1 m off the ground. How much work is done on the boulder? If it took 2 s, how much power was expended when you lifted the boulder? What is the
gravitational potential energy of the boulder at the 1 m position?

The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.

The ph is the a.independent variable b.the dependent variable c.control group

Astudent weighing 700 n climbs at constant speed to the top of an 8 m vertical rope in 10 s. the average power expended by the student to overcome gravity is most nearly