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The greenish blue of water is evidence for the

When ice that floats in water melts, the surrounding water level

In a gaseous mixture of hydrogen and oxygen, the slower molecules on average are

When a metal ring with a gap in the shape of the letter C is heated, the gap becomes

To minimize heat loss it is best that a teapot be

Small openings between leaves in a tree act as pinholes. The round spots of light cast on the ground below are images of

When we say an appliance “uses up” electricity, we are actually saying that

A positive ion has a deficiency of

Human activities that warm the Earth’s atmosphere are caused by energy

An ideal transformer has 50 turns in the primary and 500 turns in the secondary. An input of 12 V will produce an output of