What are two ways in which ultrasound technology produces images? A. By the absorption of sound waves in the body
B. By measuring the time it takes for reflected sound waves to be
detected
C. By using sound in frequencies that reflect off body tissues
D. By detecting the frequencies of emitted sound waves

Did you ever figue this

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j

Ansa new gas is observed in the form of bubbles;