What must exist for electric charges to flow?

What is the net force on an object when you combine a force of 10n north with a force of 5n south?

What units do we use to measure volume

If my cylinder of air lasts 60 minutes while i am at the surface breathing normally, assuming all else is the same, how long will it last at 20 metres/66 feet breathing normally?

Use the table below to identify four substances that undergo a physical change if the temperature is reduced from 50oc to - 50oc. what is the physical change that takes place in each case.

A man drives a car a distance of 200km at an average speed of 44kmh-1. What must be his average speed fot the next 220 km if he is to cover the total distances in 9 hours?

The kinetic energy of an object depends on both the objects mass and velocity. a. True b. False

How does a walkie-talkie work and why do people still use them?

A 125-kg merry-go-round in the shape of a uniform, solid, horizontal disk of radius 1.50 m is set in motion by wrapping a rope about the rim of the disk and pulling on the rope.

Jose wandered 4 kilometers at 2 kilometers per hour. How long did Jose wander?

What is the acceleration of a 10kg pushed by a 5n force