e. Deposition 18. A certain major league pitcher can throw a fastball at 43 m/se
ID: 568092 • Letter: E
Question
e. Deposition 18. A certain major league pitcher can throw a fastball at 43 m/sec. How fast is his fastball in miles per hour? a. 60 mph (6.170 mph c. 80 mph d. 90 mph o Fe100 mph 19. What states that is impossible for an object to suddenly become warm without receiving heat from an outside source? Dalton's atomic theory The law of conservation of energy a. b c. d. e. The law of conservation of mass Modern periodic law None of the above. 20. A certain atom has a charge of +3 and has 33 protons and 42 neutrons in the nucleus. How many electrons does this atom possess? a a.) 30 b. 33 6 C. 36 d. 42 e. None of the previous answers. 21. Which of the following best describes scientific understanding? a. It does not change. b. It can change, but does so infrequently. c. It changes constantly. d. Theories can become laws with enough experimentation e. It is essentially a collection of facts.Explanation / Answer
1.
1 m/s = 2.23694 mile / hour.
Therefore, 43 m/s = 43 x 2.23694 = 96.1883 mile/ hour
2.
Law of conservation of energy states that Energy can neither be created nor be destroyed but it can transform from one form to another. So the heat energy absorbed from the surrounding can convert to warm the system. Or without absorbing the heat energy from surrounding that system will not warm.
3.
An atom contain equal number of proton and electron. When electron donated by an atom will a get a positive charge, So +3 charge means : a loss of 3 electron from the atom.
Therefore, number of electron = 33-3 =30
4.
Science is always challenging its own principles and theories. Take the example of atomic models, Dalton atomic model, then ruther ford model, then Niels Bohr and finally quantum mechanical model. So science always accepting changes for its progressive growth and development.
So the answer is it can change , but so infrequently.
Experiments will leads to new theories and principles.
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