Magnets are often fitted to the doors of refrigerators and cupboards WHY?

If a neutral metal comb is held near an object with a negative charge, the Como become charged by induction contact friction static discharge

Positrons are spontaneously emitted from the nuclei of

A bicycle pump contains 20cm3 of air at a pressure of 100kpa the air is then pumped in a single stroke through a valve into a tyre if volume 100cm3 whihc contains air at the same pressure.

Both lead and zinc are formed as precipitates. Which of these is a step in the formation of the minerals? Select one: a. elements combine at high pressure b. magma cools after a volcanic eruption c. atoms combine in water to form solids d.

Traditional Indonesian music uses an ensemble called a gamelan that is based on tuned percussion instruments somewhat like gongs. In Bali, the gongs are often grouped in pairs that are slightly out of tune with each other.

How and which waves travel either through a medium or a vacuum?

Which of the following most accurately represents John Dalton's model of the atom?

A race car travels a circular track at an average rate of 135 mi/hr. The radius of the track is 0.450 miles. What is the centripetal acceleration of the car?

Between a substance and a mixture.

Two massive objects are fixed in position. A third object is placeddirectly between the first two at the position at which the totalgravitational force on the third object due to the two massiveobjects is zero.