A projectile is launched with an initial velocity of 80 m/s at an angle of 30° above the horizontal. Neglecting air resistance, what is horizontal component of the projectile's acceleration?
A) 80 m/s2
B) 40 m/s2
C) 9.8 m/s2
D) 0 m/s2
E) 4.9 m/s2
D
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Standing Waves on a String: A guitar string 0.65 m long has a tension of 61 N and a mass per unit length of 3.0 g/m.(a) What is the speed of waves on the string when it is plucked?(b) What is the string's fundamental frequency of vibration when plucked?(c) At what other frequencies will this string vibrate?
What will be an ideal response?
Why (experimentally) is a set of quantons prepared in a superposition of a given observable’s eigenvectors different from a classical mixture of quantons that have “already collapsed” to the different eigenvectors (with the same probabilities as predicted by the superposition)?
A. We can (in appropriate circumstances) show that the superposition is an eigenvector of some other observable, but this is not possible for a mixture. B. We can construct situations where quantons in the superposition state exhibit interference effects that cannot be observed for a mixture. C. Both A and B. D. Neither A nor B (explain).
What are some of the things that make Earth unique in the solar system?
What will be an ideal response?
Radon is
A) the chemically active element in asbestos. B) a type of electromagnetic radiation that is produced by the sun and partially penetrates Earth's atmosphere. C) the main component in the radioactive fallout from nuclear weapons and nuclear power plant accidents. D) a radioactive gas produced by the rocks and soil that can filter into houses. E) the radioactive substance that will probably be used to irradiate and sterilize food.