A guitar-like stringed instrument has a string that is 16 cm long. It sounds the musical note A (440 Hz) when played without fingering. By what distance should you shorten it to play the note C (523 Hz)?
A) 1.7 cm B) 3.4 cm C) 2.5 cm D) 4.2 cm
C
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A speedy tortoise can run with a velocity of 10.0 cm/s and a hare can run 20.0 times as fast. In a race, they both start at the same time, but the hare stops to rest for 2.00 minutes. The tortoise wins by a shell (20.0 cm). What was the length of the race?
The orbits of the electron in the Bohr model of the hydrogen atom are those in which the electron's_______________ is quantized in integral multiples of 
A. kinetic energy B. potential energy C. total energy D. linear momentum E. angular momentum
Which mission passed the bow shock in the Universe?
a. Cassini-Huygens b. Interstellar Boundary Explorer c. Voyager I d. Voyager II e. Kepler
Saturn's larger satellites have lower average density than the Galilean satellites of Jupiter; therefore, we can conclude that Saturn's satellites contain less rock and more ice than the Galilean satellites.
Answer the following statement true (T) or false (F)