Henry heavyweight weighs 1400n and stands on a pair of bathroom scales so that one scale reads twice as much as the other.
what are the scale readings?

Describe different biomes. what are some adaptations that organisms (plants or animals) must have to live in each biome?

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

What are similarities and differences of reflection, refraction, diffraction and absorption?