Answer:
All of then are true
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Explanation:
The unit of pressure in the SI system is the pascal (Pa), defined as a force of one Newton per square meter.
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Many factors can cause disturbance that results in a wave.
For example, the waves created in sea are due to the gravitational pull of attraction between Earth and moon. Human activities are also responsible(huge ships). The air above the surface of sea can also cause waves. In case of electromagnetic field, electromagnetic waves are created because of acceleration of charged particles.
Answer:
The answer is below
Explanation:
a) The change in energy is the difference between the final energy and the initial energy.
ΔE (energy change) = Ef (final energy) - Ei (initial energy)
![\Delta E=\frac{1}{2}kA_f^2 -\frac{1}{2}kA_i^2\\\\k=force\ constant=2.7\ N/cm=270\ N/m, A_f=final\ dispalacment= 3.7\ cm=0.037\ m,\\ A_i=initial \ displacement = 6.2\ cm=0.062\ m\\\\Hence:\\\\\Delta E=\frac{1}{2}(270)(0.037)^2 -\frac{1}{2}(270)(0.062)^2\\\\\Delta E=-0.334 \ J](https://tex.z-dn.net/?f=%5CDelta%20E%3D%5Cfrac%7B1%7D%7B2%7DkA_f%5E2%20-%5Cfrac%7B1%7D%7B2%7DkA_i%5E2%5C%5C%5C%5Ck%3Dforce%5C%20constant%3D2.7%5C%20N%2Fcm%3D270%5C%20N%2Fm%2C%20A_f%3Dfinal%5C%20dispalacment%3D%203.7%5C%20cm%3D0.037%5C%20m%2C%5C%5C%20A_i%3Dinitial%20%5C%20displacement%20%3D%206.2%5C%20cm%3D0.062%5C%20m%5C%5C%5C%5CHence%3A%5C%5C%5C%5C%5CDelta%20E%3D%5Cfrac%7B1%7D%7B2%7D%28270%29%280.037%29%5E2%20-%5Cfrac%7B1%7D%7B2%7D%28270%29%280.062%29%5E2%5C%5C%5C%5C%5CDelta%20E%3D-0.334%20%5C%20J)
The negative sign shows that energy is lost to the environment. Hence 0.334 J is lost to the environment.
b) According to the law of conservation of energy, energy cannot be created or destroyed but transformed from one form to another.
The oscillating object loses energy due to wind resistance, friction between the spring and the object. Given that the air is frictionless, hence the energy loss is due to friction which is converted to heat.