50 J of work was performed in 20 seconds. How much power was used to do this task? A. 4 W B. 24.5 W C. 0.4 W D. 2.5 W

What is closely related to momentum

A hot air balloon of total mass M (including passengers and luggage) is moving with a downward acceleration of magnitude a. As it approaches a mountain, the captain needs to accelerate upwards.

Which of the following is a derived unit of measurement (not a base unit) ? Select one: a. Kilogram b. Second c. Kelvin d. Joule

Almost all metals occur naturally in the ... state?

What is an electron? A. A positive particle inside the nucleus B. A negative particle outside the nucleus C. A particle inside the nucleus that has no charge D. A negative particle inside the nucleus

A soap bubble usually pops because some part of it becomes too thin due to evaporation or drainage of fluid. The change in thickness also changes the color of light the bubble reflects. Why?

Earth's magnetic field is similar to that of a bar magnet. Select all the statements that are true as a consequence of this. A. It has a north and south magnetic pole. B. It has a bar-shaped iron section inside it. C.

What does electricity depend on to make electrons move? A:a source and the attraction to opposite charges B: Only source C:Only attraction of opposite charges

If two parallel light rays hit a plane mirror, what will be their orientation to one another after they reflect? a. they will remain parallel. b. they will be perpendicular. c. it depends on the initial spacing between the light rays. d.

To extend the electrical system between the main panel and the secondary panel, the electricians used A. Receptacles B. Circuit breakers. C. feeders. D. insulators