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?
(a) 143 m/s (b) 110 Hz (c) f = m(110 Hz), m = 2, 3, 4,
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A) its mass B) its age C) its chemical composition D) all of the above
Vibrating air columns relate to which instrument?
A) guitar B) harp C) trumpet D) all of the above E) none of the above
Which of these graphs would be correct for the speed of a ball thrown upward? 
A. A B. B C. C D. D
Carla and Jenny are arguing about whether or not it is possible to escape the gravitational field of the Earth. Carla shows Jenny a system where mass m is rE (not the Earth's radius) distant from Earth and rP (not planet P's radius) distant from planet P, the mass being on the line connecting the Earth and planet P. Carla states that the mass m has escaped if FP on m = -FE on m. Jenny disagrees
Which one, if either, is correct, and why? a. Carla, because the total gravitational force on m is zero at that point. b. Carla, because there is no gravitational force from Earth on m at that point. c. Carla, because there is no gravitational force on m from Earth when r > rE. d. Jenny, because there is a gravitational force on m from Earth no matter how great the distance from the Earth. e. Jenny, because the gravitational force from the Earth can only be blocked by a body that is larger than the Earth.