When a mass executing simple harmonic oscillation has a position equal to half the amplitude, what fraction of the total mechanical energy of the oscillator is kinetic

During takeoff, the sound intensity level of a jet engine is 170db at a distance of 34 m. what's the sound intensity level at a distance of 1.0 km?

Which transition by an electron will release the greatest amount of energy? oa ob oc od

Question 11 of 13 (1 point) jump to question: a stairway, ladder, or ramp must be present in excavations in which of the following situations? a. all trenches must have access/egress b. the trench is more than 15 feet wide but only 1 ½ feet deep c. the trench is more than 4 feet deep and the devices must be within 25 feet of all workers