A compound pulley system with seven supporting strands is used to lift heavy crates. The motor being used to wind the cable in the pulley system can provide 215 lb of force. What
is the ideal mechanical advantage of the system? (Write this as just a number, not a ratio)

Which of the following is an easy way to remember the modified “x” tire rotation? a. nondrive wheels straight, cross the drive wheels b. drive wheels straight, cross the nondrive wheels c. drive wheels crossed, nondrive wheels straight d. drive wheels crossed, nondrive wheels crossed

Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2

Brief discuss how the presence of dislocations in crystal structures can be an advantage and a disadvantage to engineer and designers.