Solve the problem.The gravitational attraction A between two masses varies inversely as the square of the distance between them. The force of attraction is 2.25 lb when the masses are 4 ft apart, what is the attraction when the masses are 6 ft apart?
A. 2 lb
B. 4 lb
C. 3 lb
D. 1 lb
Answer: D
You might also like to view...
Use a finite approximation to estimate the area under the graph of the given function on the stated interval as instructed.f(x) = 
between x = 4 and x = 6 using an left sum with two rectangles of equal width.
A. 
B. 
C. 
D. 
Identify the equation as either an identity or not.(sin ? + cos ?)2 = 1
A. Identity B. Not an identity
Use a graphing utility to find or approximate solutions to the equation. If necessary, round your answers to three decimal places.x2 + 5x = -3
A. -0.697, -4.303 B. 4.303, 0.697 C. 0.541, -5.541 D. -3.197, -3.197
Solve the problem.A tank contains 2000 L of a solution consisting of 50 kg of salt dissolved in water. Pure water is pumped into the tank at the rate of 10L/s, and the mixture (kept uniform by stirring) is pumped out at the same rate. How long will it be until only 5 kg of salt remain in the tank?
A. approximately 460 seconds B. approximately 703 seconds C. approximately 276 seconds D. approximately 689 seconds