A meter stick is hung at the 50.0 cm mark from the ceiling by a rope. At the 100.0 cm mark a 22.2 N weight is hung. A rock of unknown weight is hung from the 11.5 cm mark. The system is in equilibrium.
a) What is the weight of the rock?
b) What is the tension in the rope?
B I

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.

At 12 noon, the count in a bacteria culture was 400; at 4: 00 pm the count was 1200 let p(t) denote the bacteria cou population growth law. find: (a) an expression for the bacteria count at any time t (b) the bacteria count at 10 am. (c) the time required for the bacteria count to reach 1800.

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