Helicopters are most different from airplanes in that: A. Helicopter pilots mostly use their own vision to navigate.

B. Any significant disturbance in a helicopter system means the helicopter stops flying immediately.

C. They are each used for completely different tasks.

D. Helicopters are significantly safer to fly.

The desk has a weight of 75 lb and a center of gravity at g. determine the initial acceleration of a desk when the man applies enough force f to overcome the static friction at a and b. also, find the vertical reactions on each of the two legs at a and at b. the coefficients of static and kinetic friction at a and b are ms = 0.5 and mk = 0.2, respectively

Sunidhi made a study chart about changes in states of matter. which headings best complete the chart?

Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control? a) volumes of the solutions b) appearance of the solutions c) temperatures of the solutions d) concentrations of the solutions