Identify the following quantities as scalar or vector: the speed of a snail, the time it takes to run a mile, the free-fall acceleration. a. vector, scalar, scalar c. vector, scalar, vector b. scalar, scalar, vector d. scalar, vector, vector

b) Scalar, scalar, vector.

Explanation: A scalar is just a number, this can be the speed for example, while a vector is a number that also has a direction, for example, velocity.

the speed of a snail: This is just a quantity, this would be a scalar.

the time it takes to run a mile. Just a quantity, this is a scalar.

the free-fall acceleration. The acceleration is the rate of change of the velocity, so this has a magnitude and a direction, so this is a vector.

Then the correct answer is b) Scalar, scalar, vector.

33: i think it’s b

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.