While running, a person dissipates about 0.6 J of mechanical energy per step per kilogram of body mass. If a 60-kg person runs with a power of 70 Watts during a race, how fast is the person running? Assume a running step is 1.5 m long
2.92 m/s
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Approximately how many extrasolar planets have been discovered to date?
A) tens B) hundreds C) thousands D) millions E) billions
What does the ring represent in this picture?
A) the path of the particle accelerator called the Large Hadron Collider B) a collision between high-speed subatomic particles C) the Sudbury neutrino observatory D) the Stanford linear accelerator
The major impact in the Yucatan wiped out the dinosaurs:
A) about 450 million years ago. B) about 200 million years ago. C) about 65 million years ago. D) about 36 million years ago. E) less than 2 million years ago.
Which of the following statements about oxidation and reduction reactions is true?
A) More than one electron can be transferred in an oxidation and reduction reaction. B) In a half-reaction, only half of an electron is transferred. C) Only neutral atoms are formed in oxidation and reduction reactions. D) A half-reaction is only used for reduction reactions. E) None of the above are true.