A 500-N box is pushed across a horizontal floor with a force of 250 N. The coefficient of kinetic friction is 0.4 Find the work done in pushing the box 20 m. How much work went into overcoming friction and how much into accelerating the box?

Ajet plane has a sound level of 120 db at a distance of 60 m. what is the q23. sound level at a distance of 6.0 km? (60)2 (6000)? om solution 80db db, hint: 16x assume ultrasound waves travel through the body of an animal at 1540 q24. m/s. if a 30,000 hz signal were reflected off a portion of a heart which was moving toward the source at 3 m/s, what frequency signal would return to the stationary source? solution 30.117hz

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

Which is the most accurate name for the ionic compound cas?