Possibly something that interacts with the earth's magnetic field and produces the spectacular "Northern Lights", or "Aurora Borealis" if you prefer latin. Charged particles moving at relativistically high speeds, some of which may be from the sun via solar flares. I think that mu mesons are cosmic rays. First discovered by a scientist in a hot air balloon (he 'd gone up with instruments to detect them), and later used to verify the time dilation result of special relativity by MIT and the "mount washington experiment".
Answer:
No chemical bonds are broken or formed in melting butter, so it is not a chemical change. The melting process is only a physical change, the change of state from solid to liquid.
Answer:
(a) 
(b) 
Explanation:
(a) The angular frequency is defined as:
Here f is the frequency of the particle, which is inversely proportional to its period:
Replacing, we have:
(b) The maximum displacement is given by:
D.the average kinetic energy of their particles is the same
Because it is not a good conductor of heat. so the answer is D.
