The limiting level below which a stream cannot erode the land is called its
a. base level.
b. ultimate level.
c. bed level.
d. erosion level.
a
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Which of the two signs shown below would indicate the greatest danger?
An object moving on the x axis with a constant acceleration increases its x coordinate by 80 m in a time of 5.0 s and has a velocity of +20 m/s at the end of this time. Determine the acceleration of the object during this motion
a. ?1.6 m/s2 b. +6.4 m/s2 c. +1.6 m/s2 d. ?2.0 m/s2 e. ?6.4 m/s2
The critical density of the universe is the
A) average density the universe would need for gravity to someday halt the current expansion if dark energy did not exist. B) actual average density of the universe. C) density of dark matter in the universe. D) density of water.
The figure shows an acceleration-versus-force graph for three objects pulled by rubber bands. The mass of object 2 is 36 kg. What are the masses of objects 1 and 3?
A) 14 kg and 90 kg B) 72 kg and 18 kg C) 90 kg and 18 kg D) 14 kg and 72 kg