An object is thrown downward with an initial (t = 0) speed of 10 m/s from a height of 60 m above the ground. At the same instant (t = 0), a second object is propelled vertically upward from ground level with a speed of 40 m/s. At what height above the ground will the two objects pass each other?
a. 53 m
b. 41 m
c. 57 m
d. 46 m
e. 37 m
b
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A polymer with a high % of crystallinity has a _____________hardness than does the same polymer that is less crystalline.
Fill in the blank(s) with the appropriate word(s).
Enzymes are an example of__________
A) minerals B) carbohydrates C) vitamins D) proteins
A sound wave radiates from a source in all directions. If the power of the sound source is 200 watts, then the intensity level of the sound wave 100 m from the source is (in dB)
A. 98.5. B. 92.0. C. 91.5. D. 89.6. E. 88.3.
What do we mean by accretion in the context of planet formation?
A) the formation of moons around planets B) the solidification of ices, rocks, and metal from the gas of the solar nebular C) the growth of the Sun as the density of gas increased in the center of the solar nebula D) the growth of planetesimals from smaller solid particles that collided and stuck together