If a fluid does not change density as it moves, the fluid is undergoing
A)
laminar flow.
B)
turbulent flow.
C)
irrotational flow.
D)
steady flow.
E)
incompressible flow.
E
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Fraud in science is rare because it is difficult to commit. Why is it difficult to commit fraud in science?
a. Science requires that experimental and theoretical findings be reproducible. b. All scientists are bound by a code of ethics preventing them from publishing fraudulent work. c. Scientific results are reviewed by other scientists before they are published. d. Scientific journals only allow certain highly trusted individuals to publish their work. e. Science requires that experimental and theoretical findings be reproducible and scientific results are reviewed by other scientists before they are published.
Explain the major differences between type II supernova and a type I supernova
What will be an ideal response?
Which of the following statements describes a true observation that represents strong physical evidence that magnetic poles are not the same as electric charges? Select all answers that are both physically true and represent relevant evidence. (To select multiple answers using the back of the book, point to answers with multiple fingers.)
A. We describe magnetic poles as being north and south but charges as being positive or negative. B. A magnet does not exert force on a motionless charged particle, but another charged particle will. C. A magnet exerts force in a different direction on a motionless charged particle than a charged particle does. D. Magnetic fields are measured in teslas, but electric fields are measured in N/C. E. No one has seen an isolated magnetic pole. F. What do you mean? At the deepest level, electric charges and magnetic poles really are the same thing!
The distance between the two planets is 1.6 × 106 m. How much time would the light signal take to go from one planet to the other?
A) 1.9 × 10-2 s B) 0.45 × 10-2 s C) 0.53 × 10-2 s D) 1.3 × 10-2 s E) None of the other answers is correct.