Velocity: A runner runs around a track consisting of two parallel lines 96 m long connected at the ends by two semicircles with a radius of 49 m. She completes one lap in 100 seconds. What is her average velocity?
A. 2.5 m/s
B. 5.0 m/s
C. 10 m/s
D. 0 m/s
E. 1.3 m/s
Answer: D
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A) average speed. B) instantaneous speed. C) accelerated speed.
A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after 3.0 s, assuming no air?
A) 9.8 m/s upward B) 9.8 m/s downward C) 0 m/s D) 19.6 m/s downward
Mathilda collects photoelectric data in her physics laboratory
She measures a stopping potential of 5.82 volts for radiation of wavelength 100. nm, and 17.99 volts stops 50.0 nm. (a) What is the work function for the material in eV? (b) From her data one determines Planck's constant to be what?
What was one reason that RNA was eventually replaced by DNA as the molecule of choice for storing genetic information?
A) the bases that make up DNA became much more common B) DNA is far more stable than RNA C) DNA can catalyze its own replication D) the double helix of DNA is better able to correct errors in replication