N° 2: Utrasound is a photographing technique stick uses ultrasounds. One of its applications is
blowing the powth of a fetus using sound waves of
Segexy 3 5 MHz
The speed of propagation of the sound waves in the
is of an order of 1500 m/s.
1) a) Justify whether the waves are audible by the fetus or not.
h) Specify the type of the waves,
c) Name the phenomenon on which this technique is based on?
2) a) Calculate the period of the wave used by ultrasound.
bi Determine the distance covered by this wave during one period. What does this
disance represent ?​

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final