How were the heavier elements that we have on earth produced?
a) They have always been here so they were never produced
b) all elements were produced in the Big Bang
c) all the heavy elements on earth were produced by our Sun at the center of our solar system and some elements are also produced by plants
d)By nuclear fusion and nuclear synthesis processes in stars that predated our Sun and nuclear processes that occur when the stars undergo a supernova
d)By nuclear fusion and nuclear synthesis processes in stars that predated our Sun and nuclear processes that occur when the stars undergo a supernova
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Concrete is a composite with a matrix of hydrated _________cement, and the reinforcement is aggregate with sizes ranging from fine sand to coarse rocks.
Fill in the blank(s) with the appropriate word(s).
A rocket has an exhaust speed of 2.5 × 10^3 m/s, and produces 7.5 × 10^5 N of instantaneous thrust. What mass of fuel does the rocket burn each second?
a. 3.30 × 10^–3 kg/s b. 17.1 kg/s c. 300 kg/s d. 1.90 × 10^9 kg/s
The neutron is made up of which one of the following quark combinations (up, down, strange, charm, top, bottom)?
A) uud B) ddu C) udd D) ttb E) bst
Two children start at one end of a street, the origin, run to the other end, then head back. On the way back Joan is ahead of Mike. Which statement is correct about the distances run and the displacements from the origin?
a. Joan has run a greater distance and her displacement is greater than Mike's. b. Mike has run a greater distance and his displacement is greater than Joan's. c. Joan has run a greater distance, but her displacement is less than Mike's. d. Mike has run a greater distance, but his displacement is less than Joan's. e. Mike has run a shorter distance, and his displacement is less than Joan's.