Describe how water may be treated before it is used by people?

P. S - This is a science question.

There are two types of circuits: series and parallel. In a series circuit, the objects, wires and battery or power source are in a single loop and there is only one path for the electrons to take back to the battery.

A switch in an electric circuit controls the flow of electrons in the circuit. True O False

Describe the changes of energy forms of an arrow from the time just before its release from the bow until it lands on the ground

William tell must split the apple atop his son's head from a distance of 24 m. when he aims directly at the apple, the arrow is horizontal. at what angle must he aim it to hit the apple if the arrow is shot at a speed of 25.

Why does a heavier aircraft have to move faster before it becomes airborne

Which statement is NOT true? Light travels with or without a medium Light travels faster than sound Sound must have a medium to travel through Both light and sound must have a medium to travel through

When light bends as it enters a different medium the process is known as what?

Work out the kinetic energy of a 2.5 kg remote-controlled car that is moving at 2 m/s.

Suppose a block moves across a rough horizontal surface at constant speed under the action of a horizontal 3-N force. Which statement concerning this situation is not true? a. There is more than the 3-N horizontal force acting on the block. b.

A m = 2.45 kg object hangs in equilibrium at the end of a rope (taken as massless) while a wind pushes the object with a F W = 18.9 N horizontal force. Find the magnitude of the tension in the rope and the rope's angle from the vertical.