If the sound of a speaker is recorded at 80 decibels at 4 feet, what is the decibel reading at 8 feet

Use the right-hand rule for magnetic force to determine the charge on the moving particle. this is a charge.

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)

Acar travels in reverse. it covers 150 meters in 12 seconds what is the velocity of the car what is the speed of the car