Question 8 A toy car has an initial acceleration of 2 m/s across a horizontal surface after it is released from rest. After the car travels for a time t = 5 seconds, the speed of the car is
25 m/s. Is the system consisting of only the car an open system or a closed system, and why?
Open system, because the acceleration of the car is not constant.
B
Open system, because an external force is applied to the car that causes it to accelerate.
Closed system, because the speed of the car is as expected in the case where an object has uniform acceleration for a time t.
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Closed system, because mechanical energy was not removed from the system as a result of a net force.

c. rb

explanation:

the atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons.

question1

1,000 tons

question2

3: 8

question 3

store d

step-by-step explanation:

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.

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