The muscles move the bones through connective tissue called:
a. Ligaments c. Cartilage
b. Tendons d. Marrow
B
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Construction of an arch is always begun at the two ends and laid up to the center of the arch.
Answer the following statement true (T) or false (F)
Problem 1.63 A couple M of magnitude 1500 N • m is applied to the crank of an engine. For the position shown, determine (a) the force P required to hold the engine system in equilibrium, (b) the average normal stress in the connecting rod BC, which has a 450-mm2 uniform cross section.
A ____ works by holding the forces on both sides of a diaphragm in balance.
A. cylinder valve B. regulator C. safety disc D. torch valve
An investor has $100 to invest, and two investments between which to divide it. If she invests the entire amount in the first investment, her return will be X, while if she invests the entire amount in the second investment, her return will be Y. Both X and Y have mean $6 and standard deviation (risk) $3. The correlation between X and Y is 0.3.
a. Express the return in terms of X and Y if she invests $30 in the first investment and $70 in the second.
b. Find the mean return and the risk if she invests $30 in the first investment and $70 in the second.
c. Find the mean return and the risk, in terms of K, if she invests $K in the first investment and $(100–K) in the second.
d. Find the value of K that minimizes the risk in part (c).
e. Prove that the value of K that minimizes the risk in part (c) is the same for any correlation 
with?1.