Assume that you weigh 500 N. If you are falling down through the air at constant speed, the force of the air against your body is a) zero b) more than 0 but less than 500 N c) 500 N d) more than 500 N e) need more information Explain with thorough reasoning.

A chandelier with mass m is attached to the ceiling of a large concert hall by two cables.Because the ceiling is covered with intricate architectur al decorations (not indicated in the figure, which uses a humbler depiction), the workers who hung the chandelier couldn't attach the cables to the ceiling directly above the chandelier. Instead, they attached the cables to the ceiling near the walls. Cable 1 has tension ${\displaystyle T_1}$ and makes an angle of ${\displaystyle {\theta }_1}$ with the ceiling. Cable 2 has tension ${\displaystyle T_2}$ and makes an angle of ${\displaystyle {\theta }_2}$ with the ceiling.
Find an expression for ${\displaystyle T_1}$, the tension in cable 1, that does not depend on ${\displaystyle T_2}$.
Express your answer in terms of someor all of the variables m,${\displaystyle {\theta }_1}$, and ${\displaystyle {\theta }_2}$, as well as the magnitude of the acceleration due to gravity g.

A box is sliding with a speed of 4.50 m/s on a horizontal surface when, at point P, it encounters a rough section. On the rough section, the coefficient of friction is not constant but starts at .100 at P and increases linerly with distance past P, reaching a value of .600 at 12.5 m past point P. (a) Use the work energy theorem to find how far this box slides before stopping. (b) What is the coefficient of friction at the stopping point? (c) How far would the box have slid iff the friciton coefficient didn't increase, but instead had the constant value of .1?

The end of the cutting cord on a gas-powered weed cutter is0.15 m in length. If the motor rotates at the rate of 20rev/s, what is the tangential sped of the end of the cord? 
a) 628 m/s 
b) 25 m/s 
c) 19 m/s 
d) 63 m/s 
e) 75 m/s