Each night you measure your height just before going to bed
When you arise each morning, you measure your height again and consistently find that you are 1 inch taller than you were the night before but only as tall as you were 24 hours ago! Is what happens to your body in this instance best described as a physical change or a chemical change?
A) chemical change because it involves your body
B) physical change because it readily reverses
C) chemical change because it involves changes in your bone structure
D) physical change because water expands as it freezes
Answer: B
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Why is Pluto NOT considered a Jovian planet?
A. Its atmosphere is rich in oxygen, making it more like Earth. B. Its mass and radius are very small, and it lacks the thick atmosphere of hydrogen seen on the other Jovian planets. C. It is so far out in the Solar System. D. Its interior is mostly rock and iron. E. It is not really orbiting the Sun but is simply drifting through the outer edge of the Solar System.
The fact that the sky is dark at night shows that the observable universe cannot extend forever
Indicate whether the statement is true or false
A container is filled with a mixture of helium (light molecules) and oxygen (heavy molecules) gases. A thermometer in the reads 22°C. Which gas molecules have the greater average speed?
A) It is the same for both of the gases because the temperatures are the same. B) The oxygen molecules do because they are diatomic. C) The oxygen molecules do because they are more massive. D) The helium molecules do because they are less massive. E) The helium molecules do because they are monatomic.
Wire B has twice the length and twice the radius of wire A. Both wires are made from the same material. If wire A has a resistance R, what is the resistance of wire B?
1. 4R 2. 2R 3. R 4. ½ R 5. ¼ R