The area of a lake is decreasing by

Write in words how to read each of the following out loud.
a. ${\displaystyle \{x\in R^{\prime }\mid 0<x<1\}}$
b. ${\displaystyle \{x\in R\mid x\le 0\text{or}x\Rightarrow 1\}}$
c. ${\displaystyle \{n\in Z\mid nisafactorof6\}}$
d. ${\displaystyle \{n\in Z\cdot \mid nisafactorof6\}}$

A 500 g ball swings in a vertical circle at the end of a1.5-m-long string. When the ball is at the bottom of the circle,the tension in the string is 15 N. 
What is the speed of the ball at that point?

 
Two snowcats tow a housing unit to a new location at McMurdo Base, Antarctica, as shown in the figure. The sum of the forces ${\displaystyle F_A}$ and ${\displaystyle F_B}$ exerted on the unit by the horizontal cables is parallel to the line L, and ${\displaystyle F_A=4200}$ N. Determine ${\displaystyle F_B}$? Determine the magnitude of ${\displaystyle F_A+F_B}$?

A 5.00 kg package slides 1.50 m down a long ramp that is inclined at ${\displaystyle {12.0}^{\circ }}$ below the horizontal. The coefficient of kinetic friction between the package and the ramp is k =0.310. Calculate 
(a) the work done on the package by friction (b) the workdone on the package by gravity (c) the work done on the package bythe normal force (d) the total work done on the package (e) Ifthe package has a speed of 2.20 m/s at the top of the ramp, what isits speed after sliding 1.50 m down the ramp?