A skydiver jumps through the air from a high-flying plane. As her velocity of fall increases, the net force acting on her
1) increases also,
2) decreases,
3) remains unchanged,
and her acceleration
4) increases.
5) decreases.
6) remains unchanged.
Answer: 2, 5
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A) break-up of Pangaea. B) emergence of humans. C) Pleistocene extinction. D) ice age.
Measurements of carbon dioxide concentrations in our atmosphere over the past 800,000 years show
A) an indirect correlation with global surface temperatures B) a direct correlation with global surface temperatures, only over the past century C) no correlation with global surface temperatures D) a direct correlation with global surface temperatures
Motion in a circle at constant speed is motion with constant acceleration
Indicate whether the statement is true or false
The speed of a 10-kHz sound wave in seawater is approximately 1 500 m/s. What is its wavelength in sea water?
a. 5.0 cm b. 10 cm c. 15 cm d. 20 cm e. 29 cm