If there is no external applied force, the sum of the internal stresses in a composite is equal to _________.
Fill in the blank(s) with the appropriate word(s).
zero
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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.
Which statement about dark dust clouds is true?
A) They can be penetrated only with longer wavelengths such as radio and infrared. B) They block the vast majority of radio waves from our Galaxy. C) They comprise the majority of the mass of the Galaxy. D) They can be penetrated only with shorter waves, such as UV and X-ray. E) Hydrogen and helium are the chief absorbing and scattering agents.
) A golf ball illuminate by only red light casts a colorless shadow. If instead it is also illuminated by a close-by green light source, the non-overlapping shadows will be
A) green and red. B) cyan and magenta. C) white. D) none of the above
A hydraulic jack has a mechanical advantage allowing a puny human to lift a car. Which of the following statements is true?
A. the input force is equal to the output force B. the area of the input piston is equal to the area of the output piston C. the distances the input and output pistons move are equal D. the work done by the output piston is equal to the work done on the input piston