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

Physics & Space Science

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A) tens B) hundreds C) thousands D) millions E) billions

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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.

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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

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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.

Physics & Space Science