As a projectile moves in its parabolic path, the velocity and acceleration vectors are perpendicular to each other
1.everywhere along the projectile’s path.
2.at the peak of its path.
3.nowhere along its path.
4.not enough information is given.
2
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An object of length 3.00 cm is inside a plastic block with index of refraction 1.40 . If the object is viewed through the top surface of the block at a non-zero angle from the normal, where is the object relative to its image?
a. in the same direction as its image b. above the direction of its image c. below the direction of its image d. More information is needed.
A certain coin has a diameter of 21.21 mm, a thickness of 1.95 mm, and weighs 0.04905 N. What is its density?
A) 29.1 × 103 kg/m3 B) 7.26 × 103 kg/m3 C) 9.25 × 103 kg/m3 D) 2.31 × 103 kg/m3 E) 71.2 × 103 kg/m3
The final phase of Pangaea's break-up was the split of
A) Antarctica from Australia, and North America and Greenland from Europe. B) South America from Africa, and Antarctica/Australia from India/Madagascar. C) Antarctica from Australia, North America from Europe, and Europe from Asia. D) Africa from Antarctica/Australia, and India/Madagascar from Asia.
The second law of thermodynamics says that the total amount of entropy, or randomness, in the universe cannot decrease. However, we see all around us objects that become more ordered-for example, the development of a biological organism or water that freezes. The decrease in entropy, or randomness, in such cases does not violate the second law because
A. water and living things do not have entropy. B. there is always a greater increase in entropy somewhere else. C. energy must be added. D. energy must be removed.