Hat do peaked roofs, convertible tops, and airplane wings have in common when air moves faster across their top surfaces? what do peaked roofs, convertible tops, and airplane wings have in common when air moves faster across their top surfaces?
a. the pressure underneath them is reduced.
b. the pressure underneath them is increased.
c. the pressure above them is reduced.
d. the pressure above them is increased.

Determine the maximum r-value of the polar equation r =3+3 cos 0

Boxing gloves are padded to lessen the force of a blow. (a) calculate the force exerted by a boxing glove on an opponent’s face, if the glove and face compress 7.50 cm during a blow in which the 7.00-kg arm and glove are brought to rest from an initial speed of 10.0 m/s. (b) calculate the force exerted by an identical blow in the gory old days when no gloves were used and the knuckles and face would compress only 2.00 cm. (c) discuss the magnitude of the force with glove on. does it seem high enough to cause damage even though it is lower than the force with no glove?

Arigid tank is divided into two equal parts by a partition. one part of the tank contains 3 kg of compressed liquid water at 400 kpa and 60°c while the other part is evacuated. the partition is now removed, and the water expands to fill the entire tank. determine the entropy change of water during this process, if the final pressure in the tank is 40 kpa. use steam tables.