A model rocket sits on the launch pad until its fuel is ignited, blasting the rocket upward. During the short time of blast-off, as the ignited fuel goes down, the rocket goes up because:
a. the fuel pushes on the ground. b. air friction pushes on the escaping fuel.
c. the downward force of gravity on the rocket is less than the rate of downward momentum increase of the fuel.
d. of none of the above reasons.
C
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Graphical Addition: Two vectors, of magnitudes 20 mm and 50 mm, are added together. Which one of the following is a possible value for the magnitude of the resultant?
A. 10 mm B. 20 mm C. 40 mm D. 80 mm
Describe the phenomenon known as diffraction
What will be an ideal response?
The Moon always keeps the same side facing Earth and therefore Earth always keeps the same side facing the Moon
a. True b. False Indicate whether the statement is true or false
The triple alpha process produces energy by fusing ________ into ________.
A. carbon and nitrogen; cyanogen B. oxygen and carbon; carbon dioxide C. helium; carbon D. oxygen; carbon E. hydrogen; helium