If you toss a ball straight upward at 40 m/s with no air resistance, one second before it reaches the top of its path its speed is
A) zero.
B) 10 m/s.
C) 20 m/s.
D) 30 m/s
E) 40 m/s.
Answer: B
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What evidence supports the predicted existence of gravitational waves?
A) The orbit of a star system consisting of two neutron stars is slowly decaying, suggesting that energy is being carried away by gravitational waves. B) The energy generated by gravitational waves from the Sun can be seen as it is absorbed by Jupiter. C) Gravitational waves are frequently and easily detected by large telescopes. D) Photographs of spacetime show the gravitational waves as ripples that are clearly visible.
The ancient Greek who is known for championing the concept of the atom was named ______________
Fill in the blank(s) with correct word
The log of the fatigue-crack propagation rate for most materials is linearly related to the log of the stress _________range to a power.
Fill in the blank(s) with the appropriate word(s).
A spherical rock has a density of 3 g/cm3. If another rock has the same mass but is twice as wide, its density must be ________ g/cm3.
A. 6 B. 3/8 C. 3/4 D. 3/2