Aman stands still on a moving walkway and a woman walks past him in the
same direction as the escalator. to a stationary observer, the man has a
speed of 0.3 m/s and the woman has a speed of 0.38 m/s. from the frame of
reference of the man on the escalator, how fast is the woman walking?
oa. 0.3 m/s
ob. 0.38 m/s
oc. 0.08 m/s
od. 0.68 m/s

Aperson walking 1 mile everyday for exercise, leaving her front porch at 9: 00 am and returning to her front porch at 9: 25 am. what is the total displacement of her daily walk? a) 1 mileb) 0c) 25 minutes d) none of the above

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

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.