One grocery clerk can stock a shelf in 45 minutes. a second clerk requires 20 minutes to stock the same shelf. How long would it take to stock the shelf if the two clerks worked together?

Why do we need to separate out certain things from a mixture

A person is pushing a box across a table. The measured forces on the box are 10N, 14N, - 7N, - 10N. Which force is represented by - 7N?

What is a push or pull that acts on a object

A 200.0 kg piano is elevated by a crane to a height of 10.0 meters above a sidewalk. If the rope holding the piano breaks, what will the potential energy of the piano be when it has fallen 5.00 meters? a) 0 J b) 9,810 J c) 10,000 J d) 19,620 J

A fuel cell that is becoming very popular for cars runs on: hydrogen gas oxygen gas nitrogen gas chlorine gas

What is an organism ability to maintain a steady internal condition called

What is the fundamental frequency of a particular medium?. a. the lowest frequency at which a standing wave is possible. b. the highest frequency at which s standing wave is possible

The distance from the inner core to the surface of the earth is about 5,200 kilometers. the large amount of material surrounding the inner core places tremendous pressure on it.

What type of wave is sound? longitudinal light surface transversal

What is the difference between meteors and meteorites?