What is the total force on the bottom of a 2.0-m-diameter by 1.5-m-deep round wading pool due to the weight of the air and the weight of the water? (Note the pressure contribution from the atmosphere is 1.0 × 10^5 N/m2, the density of water is 1 000 kg/m3, and g = 9.8 m/s2.)
a. 5.1E+5 N
b. 1.4E+6 N
c. 2.1E+5 N
d. 3.6E+5 N
e. 2.1E+5 N
d
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Have astronomers ever seen a gas cloud that looks like it contains planetary systems that are in the process of forming?
A) Yes, there are many such clouds, including the Orion Nebula. B) Yes, but only the original cloud that formed our own solar system. C) Yes, but only in distant galaxies, not in our own Milky Way. D) No, there is no evidence that any interstellar clouds are currently giving birth to stars.
Which of the following is a unit of energy:
a. watt b. ft—lb/sec c. newton/sec. d. horsepower e. joule
The nights are cold on Mercury because it has a negligible atmosphere
a. True b. False Indicate whether the statement is true or false
A car coasts down a road into a valley and then coasts back up the next hill some distance
Where has its change in velocity been greatest? At the point at which it stops while going uphill? At the bottom of the hill? As it rolls back through the bottom to the other side? Explain.