Whether a truck comes to a stop by crashing into a haystack or a brick wall, the stopping force is
A) greater with the haystack.
B) greater with the brick wall.
C) both the same
Answer: B
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Consider the following statement, and explain whether or not it is sensible: It will take me light-years to complete this homework assignment
What will be an ideal response?
Sunspots are dark because
a. regions of the photosphere are obscured by material in the chromosphere. b. shock waves move through the photosphere. c. the sun rotates differentially. d. the strong magnetic field inhibits the currents of hot gas rising from below. e. they radiate their energy into space faster than the rest of the photosphere.
When sound travels faster at ground level than higher in the air, sound tends to bend
A) upward. B) downward. C) neither of these
_________ stresses are stresses in a material that are not caused by an external applied force.
Fill in the blank(s) with the appropriate word(s).