Diagnostic ultrasound of frequency 4.80 mhz is used to examine tumors in soft tissue.
(a) what is the wavelength in the air of such a sound wave?
(b) if the speed of sound in tissue is 1500m/s, what is the wavelength of this wave in tissue? (hint: the speed of sound wave in air is always 343m/s)

Apositive point charge q is fixed on a very large horizontal frictionless tabletop. a second positive point charge q is released from rest near the stationary charge and is free to move. which statement best describes the motion of q after it is released? assume q stays on the table

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below. your friend goes first, and you follow after he has dropped a distance of 2.0m. when your friend hits the water, is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

What determines the amount of inertia an object has