2. A compression wave, like sound, is a kind of ? wave. 3. When a wave reflects off a surface, the angle of _?__ always equals the angle of __?___

4. The wailing change of the pitch that you hear as a locomotive approaches and then recedes from you is called ___?___

it is because acrylic blanket have acrylic textile fiber

explanation:

its is better than wool blanket

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.

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19