What is the answer to the following question(s):

how many w(h) are represented by a 100 w hair dryer running for half an hour?

and a 25 w compact fluorescent bulb produces approximately the same amount of energy as a incandescent bulb.

a)
50 w(h)

b)
200 w(h)

c)
25 w(h)

d)
100 w(h)

Suppose that two tanks, 1 and 2, each with a large opening at the top, contain different liquids. a small hole is made in the side of each tank at the same depth 1.57 m below the liquid surface, but the hole in tank 2 has 2.49 times the cross-sectional area of the hole in tank 1. (a) what is the ratio ρ1/ρ2 of the densities of the liquids if the mass flow rate is the same for the two holes? (b) what is the ratio rv1/rv2 of the volume flow rates from the two tanks? (c) at one instant, the liquid in tank 1 is 14.9 cm above the hole. if the tanks are to have equal volume flow rates, what height above the hole must the liquid in tank 2 be just then?