Scientist have been able to determine the composition of Earth's layers by:
1 answer:
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B) 20-40 percent
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Answer:
IMA of given system = 
Explanation:
- The "Ideal Mechanical advantage" (IMA) of given pulley is
.
- Ideal Mechanical advantage of a system is defined by the ratio of achieved or output force to the implied force. In the pulley system above, output force is the resistant force denoted by
. The input force is analogous or equivalent to the effort applied i.e.
.
- Hence by dividing these two forces we calculate the IMA of the above mentioned pulley system which is
. - Its mathematical reference would be:
IMA = 
b. The sweater has a tendency to attract protons.
It does not move because of the sun the sun has no energy.