Convert each of the following to three significant figures: (a) 20 lb. ft to n. m, (b) 450 ib/ft^3 to kn/m^3, and (c) 15 ft/h to mm/s.

a)20 lb.ft=27.2 N.m

b)

c)15 ft/h = 1.26 mm/s

Explanation:

a)

As we know that

1 ft.lb= 1.36 N.m

So 20 lb.ft = 1.36 x 20 N.m

20 lb.ft=27.2 N.m

b)

We know that

So

c)

As we know that

1 ft/h=0.084 mm/s

So

15 ft/h = 0.084 x 15 mm/s

15 ft/h = 1.26 mm/s

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explanation:

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