1. The length of a rectangle with a constant area varies inversely as its width. The length of this rectangle is 8in when its width is 3in. Find the length when the width is 4in.
2. The number of people working on a certain job varies inversely as the number of days needed to finsih the job. If it takes 10 carpenters to finish a house in 8 days, in how many days will 4 carpenters finish it?
3. Work varies jointly as force and distance. How much work is done when a 30 N object is raised to a height of 15m?
2 answers
What have you done so far?
I only did 1 and 3 but I don't know if its correct.
1. L = a/w ===== 8 = a/3
(3(8) = (a/3)(3)
24 = a
L = 24/4 = 6
3. W = FD ====== (60N)(15m) = 900 Nm
1. L = a/w ===== 8 = a/3
(3(8) = (a/3)(3)
24 = a
L = 24/4 = 6
3. W = FD ====== (60N)(15m) = 900 Nm
1 answer