Which substance has the least density? a. an iceberg b. a gallon of water c. a block of aluminum d. a small piece of lead

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

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 is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest