Asolid metal ball and a hollow plastic ball of the same external radius are released from rest in a large vacuum chamber. when each has fallen 1 m they both have the same

a, speed.
b, momentum.
c, kinetic energy.
d, inertia.
e, change in potential energy.

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

Which types of electromagnetic waves have higher frequencies than the waves that make up ultraviolet light? check all that apply. radio waves infrared light microwaves gamma rays visible light x-rays

What is the measurement of how fast an object moves relative to a reference point?