A 50.0-g ball traveling at 22.0 m/s is bounced off a brick wall and rebounds at 21.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 2.50 ms, what is the average acceleration of the ball during this time interval?
a. 1.72E+4 m/s2
b. 3.44E+4 m/s2
c. 8.60E+3 m/s2
d. 1.72E+1 m/s2
e. 4.30E+1 m/s2
a
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When two elements come together to form a compound, which element is named first within the name of the compound?
A) The element coming first in the English alphabet. B) The element with the greater atomic mass. C) The element with the greater atomic number. D) The element toward the left hand side of the periodic table.
Suppose that a certain atom possesses only four distinct energy levels. Assuming that all transitions between levels are possible, how many spectral lines will this atom exhibit?
A) three B) four C) six D) unlimited
Astronomers expect extrasolar planetary systems to have very different overall properties than those found in our solar system
Indicate whether the statement is true or false
A river 100 m wide flows due south at 1 m/s. A boat that travels 1 m/s relative to the water is pointed due east as it crosses from the west bank. The boat reaches the east bank
A) due east of its starting point. B) 100 m farther south. C) 141 m farther south. D) none of the above