Answer:
A. can never be efficient due to friction
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❖ The correct answer choice is A. A chemical change has occurred because new compounds have been produced.
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Tan x = AC / BC
tan (4.3) = 35 / BC
BC = 35 / tan (4.3) = 465.485 m
Speed = 1300 km/h = 361.111 m/s
465.485 / 361.111 m/s = 1.289 seconds
hope this helps
Answer:
Black holes are detected as surrounding material (like gas) is funnelled by the force of gravity into a disk around the black hole. The gas molecules in the disk swirl around the black hole so fast that they heat up and emit X-rays. These X-rays can be detected from Earth.
Explanation:
