As water begins to boil in a kettle the hotter water at the bottom of the kettle closest to the stove begins to rise and the cooler water above sinks and warms. Why does this occur?

11. Which of the following phenomena is taking place when sound waves are reflected from a surface along parallel lines? A. Refracting B. Absorption C. Focusing D. Diffusion

A boy whirls a stone with uniform speed in a horizontal circle of radius 2 m and at height 2 m above the ground. The string breaks and the stone flies off horizontally and strikes the ground after traveling a horizontal distance of 2 m.

Why can gamma rays pass threw or penetrate solids?

The total work done in lifting a typical high school physics textbook a vertical distance. 1 meter is approximately a. 15 J b. 1.5 J c. 15 J d. 150 J

A charge of 30. coulombs passes through a 24-ohm resistor in 6.0 seconds. What is the current through the resistor? (1) 1.3 A (3) 7.5 A (2) 5.0 A (4) 4.0 A

Which is a vector quantity speed or velocity

With a naked eye your are unlikely to see a "blank" in your lifetime. A - Comet. B - Shooting Star. C - Meteor. D - Planet.

If there is a current of 15A in a circuit for 5 minutes, what quantity of electric charge flow through the circuit?

Which universal force acts on protons and neutrons in an atom's nucleus?

How many turns are in the secondary coil of a step up transformer that increases voltage from 30 V to 150 V and has seven turns in the primary coil?