Solve the problem.The spring of a spring balance is 5.0 in. long when there is no weight on the balance, and it is 8.3 in. long with 9.0 lb hung from the balance. How much work is done in stretching it from 5.0 in. to a length of 14.6 in.?
A. 130 in.-lb
B. 13 in.-lb
C. 260 in.-lb
D. 17 in.-lb
Answer: A
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A. 55 B. 99 C. 362,880 D. 19,958,400
Solve the system by using the inverse of the coefficient matrix. x - 2y + 3z = 114x + y - z = 42x - y + 3z = 10
A. ? B. {(-2, -3, 3)} C. {(2, 3, 5)} D. {(2, -3, 1)}
Solve the problem.The distance to the horizon varies directly as the square root of the height above ground level of the observer. If a person can see 6 miles from a height of 25 feet, how far can a person see from a height of 36 feet?
A. 7.2 mi B. 7.5 mi C. 6.6 mi D. 8.4 mi
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