A mobile phone is 35% efficient. Over half an hour 11 kJ of energy is transferred to the phone. Calculate the amount of energy usefully transferred by the machine over half an hour.

Amachine, modeled as a simple spring-mass system, oscillates in simple harmonic motion. its acceleration is measured to have an amplitude of 5,000 mm/s with a fre- quency of 10 hz. compute the maximum displacement the machine undergoes during this oscillation.

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Which two particles are found in the center of an atom