Calculate the minimum frequency of ultrasound that will allow you to see details as small as 0.250 mm in human tissue. (The average propagation speed for sound in body tissue is 1540 m/s) Group of answer choices 9.00 X 10^6 Hz 6.16 X 10^6 Hz 8.26 X 10^6 Hz 5.26 X 10^6 Hz

Acar of mass m goes around a banked curve of radius r with speed v. if the road is frictionless due to ice, the car can still negotiate the curve if the horizontal component of the normal force on the car from the road is equal in magnitude to 101) a) mv2/r b) mg/2. d) mg e) tan[v2/(eg)]

With i really need the correct answer!

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s