Solve the problem.The number of centimeters, d, that a spring is compressed from its natural, uncompressed position is given by the formula d = 
, where W is the number of joules of work done to move the spring and k is the spring constant. Solve this equation for W. Use the result to determine the work needed to move a spring 4 centimeters if it has a spring constant of 0.4.
A. W = 2d2k; 12.8 joules
B. W = 
; 3.2 joules
C. W = 
; 0.6 joules
D. W = 
; 80 joules
Answer: B
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where t is the time (in seconds). Find the average value of v over the interval from t = 0 to t = 2. Round to the nearest volt.
A. 6 volts B. 40 volts C. 1564 volts D. 194 volts
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A. -$1.00 B. -$0.50 C. -$0.42 D. -$0.40
Solve.3700 ft-lb is equivalent to how many BTU, rounded to the nearest whole number?
A. 5 BTU B. 47 BTU C. 2,508,600 BTU D. 2,878,600 BTU
Solve the equation for the indicated variable.v2 = 2as for v
A. v = 
B. v = 2a
C. v = ± 
D. v = ± 