If you hold your arm outstretched with palm upward the force to keep your arm from falling comes from your deltoid muscle. Assume that the arm has mass 4.0 kg and the distances and angles shown in figure 1. What force must the deltoid provide to keep the arm in this position.

Awoman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. the book has a mass of m = 1.8 kg and the coefficient of static friction between her hand and the book is μs = 0.67. no attempt 50% part (a) what is the weight of the book, fgb in newtons?

Which of the following bonds would be most polar? a. c-i b. c-br c. c-cl d. c-f e. c-o

Two kilograms of air within a piston–cylinder assembly executes a carnot power cycle with maximum and minimum temperatures of 800 k and 300 k, respectively. the heat transfer to the air during the isothermal expansion is 60 kj. at the end of the isothermal expansion the volume is 0.4 m3. assume the ideal gas model for the air. determine the thermal efficiency, the volume at the beginning of the isothermal expansion, in m3, and the work during the adiabatic expansion, in kj.