A device used to open and close an electric circuit is a (n)

a. light bulb.

b. energy source.

c. switch.

d. resistor.

The pitch of an ambulance siren changes as it approaches you. The pitch also changes as the siren moves away from you. Which is the scientific term for this occurrence?

Speed of a car that travels 180 km in 3.00 hrs

What is the upper range for the temperatures of stars

Vectors are used to describe many physic concepts. Any vector is completely defined with just 2 properties. Which the following statements is true.

What is the speed of sound in dry air at 0°C?

Why is a decrease in Earth's ozone harmful to life?

What force does a window washer want acting on him when trying to keep the same position

How many Mars-sized planets can fit in Jupiter

Is tin magnetic, ferromagnetic or non-magnetic?

Mrs. Newman's class decides to perform an experiment during a class connect session to determine how long it takes different objects to hit the floor when dropped from the student's desk. Each student dropped three notebooks, one weighing 0.