A copper object has volume of 0.47cm³ mass of 4.18g.
The density of copper in kgm-³ is

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 duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.

because if the tool that you are using is not balanced it there would be false mass.