The age of the solar system is believed to be approximately 4.6 billion years based on the data from
a. samples of lunar rocks.
b. samples of Earth rocks.
c. samples of meteorites.
d. all of the above
e. none of the above
D
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If the value of H has not changed since the Big Bang, then H = 70 km/s/Mpc will give a Hubble Time of about 14 billion years
Indicate whether the statement is true or false
One force acting on a falling apple is the apple's weight. Which of the following is the best description of the other member of the "force pair" [of which the apple's weight is one member]?
A) Gravity pulling downward on the apple. B) The force of gravity by Earth pulling upward on the apple. C) The force of gravity by the apple pulling upward on Earth. D) The force of gravity by the apple pushing downward on Earth. E) Air resistance acting upward on the apple.
Which pair are isomers?
a. CH3 CH2 CH(NH2) CH3 and CH3 CH(NH2) CH2 CH3 b. CH3CH(Cl)CH3 and CH3CH2CH(Cl)CH3 c. (CH3)3 N and CH3CH2CH2NH2 d. CH3 (CH2)2 CH3 and CH3 CH2CH(CH3)2 e. CH3CH2CH(Cl)CH3 and CH3 CH(NH2) CH2 CH3
Determine the change in length of a 20-m railroad track made of steel if the temperature is changed from ?15°C to +35°C. (?STEEL = 1.1 × 10^?5/°C)