Answer: I believe that it is A and D. Or A or D.
A, D
Explanation:
Answer:
I believe it is vacuum of space
Explanation:
Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.
Number of element atom for element,
Calcium (Ca) = 1
Carbon (C) = 1
Oxygen (O) = 3
Answer:
80%
Explanation:
Efficiency of machine = work output/work input ×100 %
From question, work output = 20J
Work input = 25J.
Therefore efficiency = 20/25 × 100 %
Efficiency = 20×4 %
Efficiency = 80%
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