When a straw with liquid is covered by a finger and raised, the liquid does not leak from the straw. Explain this using ideas of pressure exerted by particles.

Take your finger away from the straw and the downward force of the air pressure on the liquid will be the same as the upward force. These two effects cancel each other out leaving gravity as the dominant force causing the suspended liquid to drop out the bottom.

lol I don't know think u could help me with my mathematics

b.transmitters send radio waves, and receivers capture radio waves.

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.