A 72-kg man is standing in a 20-kg boat. The man steps to the right thinking he is stepping out onto the dock. However, the following will actually happen (ignore the friction of the water or air on the boat or the man):
Answer: the man only moves a short distance to the right while the boat moves a larger distance to the left
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How do most of the heavier elements up to iron form in the universe?
A. by nucleosynthesis in the cores of massive stars B. in supernova explosions C. in the cores of protostars D. in the original interstellar clouds
The amount of time between successive passes of any given star across the meridian is
A) 23 hours 56 minutes. B) 24 hours. C) 365.25 days. D) 12 years. E) 26,000 years.
The measured temperature of the cosmic background radiation is ____________________
Fill in the blank(s) with correct word
An object travels in a circle of radius 2.0 m with a constant speed of 4.0 m/s. What is the direction of its acceleration?
a. Toward the center of the circle b. Normal to the plane of the circle c. Insufficient data given for determination d. Tangential to the circle e. None of these