Answer:
Time taken t = 4.167 seconds (Approx)
Explanation:
Given:
Initial Speed u = 12 m/s
Final speed v = 0 m/s
Acceleration a = -50 m/s²
Find:
Time taken t
Computation:
v = u + at
0 = 12 + (-50)t
t = 4.167 s
Time taken t = 4.167 seconds (Approx)
Answer:-1.83
Explanation:
1 13
-7.34
<h3><u>subtract-5.51</u></h3><h3> 1.83 </h3>
Elements emit colours when heated because electrons in atoms can have only certain allowed energies.Heating an atom excites its electrons and they jump to higher energy levels. When the electrons return to lower energy levels, they emit energy in the form of light. Every element has a different number of electrons and a different set of energy levels. Thus, each element emits its own set of colours. See, for example, mercury and neon above. Those colours are as distinctive to each element as fingerprints are to people.
Answer: C) extremely rapid cooling
Explanation:
When magma goes through extremely rapid cooling and especially if it did not dissolve enough water into it, it could freeze to glass or the mineral crystals that will be formed will be so small, they will look like glass.
This is because the reactions that occur to create minerals are affected directly by temperature such that if the magma cools down extremely slowly, it will form very large crystals but extremely fast would result in small crystals.
Failure. Why we fail, How we fail. Who thinks we fail. and how it leads to success even though we don't know if we're really successful.
