20 POINTS!!!!!!!!!!!!! WILL BRAINLY 1. Which of the following best summarized the main idea of the passage?

A“Researchers use wind tunnels to learn more about how an aircraft will fly.” (paragraph 1)

B“Special instruments are often used to measure the force of the air on the object.” (paragraph 2)

C“NASA engineers tested ideas for the design of Ares in wind tunnels.” (paragraph 6)

D“Long after the first design work is finished, NASA can still use wind tunnels.” (paragraph 7)

1. Which key detail helps the reader understand the importance of using wind tunnels?
   

AWind tunnels can move air more than 4,000 miles per hour.

BWind tunnels are design tools that help make safer aircraft vehicles.

CWind tunnels can create different atmospheres.

DWind tunnels are large tubes that show how air moves.

1. The statement that “NASA also works with others that need to use wind tunnels” most strongly suggests that
   

AMany different groups are developing space shuttles

BNASA hopes to buy vehicles made by other agencies

CNASA has the largest wind tunnels in existence

DMany companies do not have their own wind tunnels

1. The most important feature of a wind tunnel used to test vehicles that can land on Mars is the ability to test how
   

AGravity affects vehicles

BA thin atmosphere affects vehicles

CHigh-speed winds affect vehicles

DFreezing temperatures affect vehicles

1. Which sentence from the passage best explains why NASA uses wind tunnels to test spacecraft models?
   

A“These vehicles are made to operate in space.” (paragraph 5)

B“Spacecraft and rockets have to travel through the atmosphere to get to space.” (paragraph 5)

C“They needed to know what would happen to different designs when the spacecraft came back through the atmosphere.” (paragraph 6)

D“Some are only a few inches square, and some are large enough to test a full-size airplane.” (paragraph 9)

1. Which sentence from the passage best explains how a wind tunnel works?
   

A“NASA uses wind tunnels to test scale models of aircraft and spacecraft.” (paragraph 1)

B“The object to be tested is fastened in the tunnel so that it will not move.” (paragraph 2)

C“The air moving around the still object shows what would happen if the object were moving through the air.” (paragraph 2)

D“Smoke or dye can be placed in the air and can be seen as it moves.” (paragraph 2)

BACKNEXT