The world's record in the 100 m dash is 9.69 seconds and in the 100 yard dash is 9.21 seconds.
a) find the speed in mi/h of the runner who set the record of 9.69 seconds.
b) find the speed in mi/h of the runner who set the record of 9.21 seconds.

A) The speed of the runner is 23.085 mile/hr.

B) The speed of the runner is 22.209 mile/hr.

Explanation:

A) Distance covered in 9.69 seconds = 100 m

1 mile = 1609.34 m

1 hour = 3600 seconds

9.69 s =

Speed of the runner =

The speed of the runner is 23.085 mile/hr.

B) Distance covered in 9.21 seconds = 100 yards

1 mile = 1760 yards

1 hour = 3600 seconds

9.21 s =

Speed of the runner =

The speed of the runner is 22.209 mile/hr.

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.