A thin rectangular piece of wood floats in water. You slowly pour oil with a density equal to that of the wood on the surface of the water until the height of the oil above the water is twice the height of the piece of wood. Which statement is correct?
a. The wood floats on top of the oil, so it sticks up in the air.
b. The wood does not change its position
c. The wood sinks below the surface of the water.
d. The wood is half in the water and half in the oil.
e. The wood floats in the oil just above the water.
e
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Fill in the blank(s) with correct word
When an unstable nucleus decays by emitting an alpha particle, the atomic mass number A of the nucleus
A) increases by 4. B) increases by 2. C) decreases by 2. D) decreases by 4. E) remains unchanged.
A woman looking in a makeup mirror sees her face at twice its actual size and right-side up. If she is 22.0 cm from the mirror, what is its focal length?
a. 44.0 cm c. 18.6 cm b. 48.3 cm d. 56.0 cm
An atom contains two or more molecules bonded together
Indicate whether the statement is true or false