The intensity ,i from a point source decreases with the inverse square of the distance, r from the source. suppose that you are listening to your favourite music coming away from a speaker(regarded as a point source and in an open area) placed exactly r1 from you. then you suddenly decide to move away to a new position ,r2 which is exactly twice as far away from the speaker.
calculate by how many decibels ,db does the sound intensity level ,β drop ,when you move twice as far away from the speaker to your new position.

Contrast the force of gravity between these pairs of objects a 1 kg mass and a 2 kg mass that are 1 m apart and two 2 kg masses that are 1 m apart

An alligator swims to the left with a constant velocity of 5 \,\dfrac{\text{m}}{\text s}5 s m ? 5, space, start fraction, m, divided by, s, end fraction. when the alligator sees a bird straight ahead, the alligator speeds up with a constant acceleration of 3 \,\dfrac{\text {m}}{\text s^2}3 s 2 m ? 3, space, start fraction, m, divided by, s, start superscript, 2, end superscript, end fraction leftward until it reaches a final velocity of 35 \,\dfrac{\text {m}}{\text s}35 s m ? 35, space, start fraction, m, divided by, s, end fraction leftward. how many seconds does it take the alligator to speed up from 5 \,\dfrac{\text {m}}{\text s}5 s m ? 5, space, start fraction, m, divided by, s, end fraction to 35 \,\dfrac{\text {m}}{\text s}35 s m ? 35, space, start fraction, m, divided by, s, end fraction?

Use vsepr theory to predict the molecular geometry of the molecule hcn.