Thermal energy will flow in a direction from cold to hot
A) only with external effort.
B) near absolute zero.
C) never.
D) always.
Answer: A
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What practical value did astronomy offer to ancient civilizations?
A) It helped them keep track of time and seasons, and it was used by some cultures for navigation. B) It allowed them to predict eclipses with great accuracy. C) It helped them understand our cosmic origins. D) It helped them find uses for ancient structures like Stonehenge.
A river's suspended load and bed load may accumulate at its mouth and form a
a. sea arch. b. guyot. c. delta. d. sea mount.
Two strings are respectively 1.00 m and 2.00 m long. Which of the following wavelengths, in meters, could represent harmonics present on both strings?
a. 0.800, 0.670, 0.500 b. 1.33, 1.00, 0.500 c. 2.00, 1.00, 0.500 d. 2.00, 1.33, 1.00 e. 4.00, 2.00, 1.00
The figure shows a ‘snapshot’ of four different waves in identical ropes stretched with the same force
The waves with the largest frequency are __________ and _________.