A negative velocity, approaching zero, represents a negative acceleration
Indicate whether the statement is true or false
FALSE
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Which of the following best explains why an interstellar ramjet could, in theory, achieve continuous acceleration?
A) It uses fuel that is more efficient than any other known fuel. B) It collects its fuel as it goes, rather than having to carry the weight of fuel along with it. C) It takes advantage of theoretically possible loopholes in Einstein's theory of relativity. D) It has such a large fuel tank that it will essentially never use up all the fuel it carries. E) Its speed always gets faster because time dilation changes the rate at which time flows.
Which of the following greatly improves the angular resolution of radio maps?
A) Schmidt corrector plates B) more sensitive spectrometers C) switching from film to CCD imaging D) use of interferometers E) chilling the infrared detectors
As an object moves from point A to point B only two forces act on it: one force is nonconservative and does ?30 J of work, the other force is conservative and does +50 J of work. Between A and B, a. the kinetic energy of object increases, mechanical energy decreases
b. the kinetic energy of object decreases, mechanical energy decreases. c. the kinetic energy of object decreases, mechanical energy increases. d. the kinetic energy of object increases, mechanical energy increases. e. None of the above.
An electron is confined in a one-dimensional box (an infinite well)
Two adjacent allowed energies of the electron are 1.068 × 10-18 J and 1.352 × 10-18 J. What is the length of the box? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg) A) 1.9 nm B) 0.93 nm C) 1.1 nm D) 2.3 nm