If we double the mass of an object without a change in volume, its density would be
A) half.
B) double.
C) unchanged.
Answer: B
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Which of the following is true of life on Earth?
A) Life, in the form of multicellular organisms, has existed on Earth for only about 2 million years. B) Life has existed on Earth for at least 3.4 billion years. C) The Cambrian explosion marks the formation of the first unicellular organisms on Earth. D) Complex multicellular organisms were present on Earth 2.5 billion years ago.
Process of Science: Give a scientific explanation of the success of the central African rainfall-prediction technique of observing the waxing crescent Moon. Can the Moon cause a change in rainfall? Or vice versa?
What will be an ideal response?
Process of Science: Explain the reasoning that led to our understanding of nuclear energy being the source of the Sun's light
What will be an ideal response?
Burl and Paul on a sign-painting scaffold are in equilibrium, which means that the net upward supporting force of the vertical ropes is
A) equal to their weights. B) greater than their weights. C) equal and opposite to the combined weights of Burl, Paul, and the scaffold. D) none of the above