In a sand casting process the volume flow rate of metal into a mold is 0.02 m/( the top of the sprue has a diameter of 200 mm and a length of 500 mm. what diameter should be specified at the middle and at the bottom of the sprue to have a continuous flow (avoid aspiration)? if the reynold's number at the bottom of the sprue is greater than 20,000 what changes do you suggest (changes to the material or the mold design) in order to avoid a turbulent flow?

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.

answer(20) psi;

the journeys of marquette, joliet and la salle a) new france expand.

all three of these explorers explored the midwest and the area around the great lakes, which they subsequently claimed for france.

this was a big portion of territory and expanded new france which before then only consisted of quebec province in northeastern canada