Question :   31. The water behind Grand Coulee Dam 1 200 m : 2102189

 

31. The water behind Grand Coulee Dam is 1 200 m wide and 150 m deep. Find the hydrostatic force on the back of the dam. (Hint: the total force = average pressure ´ area)

A. 5.2 ´ 10⁹ N

B. 8.8 ´ 10¹⁰ N

C. 13.2 ´ 10¹⁰ N

D. 18.0 ´ 10¹⁰ N

32. How deep under the surface of a lake would the pressure be double that at the surface? (1 atm = 1.01 ´ 10⁵ Pa)

A. 1.00 m

B. 9.80 m

C. 10.3 m

D. 32.2 m

33. A piece of aluminum has density 2.70 g/cm³ and mass 775 g. The aluminum is submerged in a container of oil (oil's density = 0.650 g/cm³). How much oil does the metal displace?

A. 287 cm³

B. 309 cm³

C. 232 cm³

D. 1 125 cm³

34. A piece of aluminum has density 2.70 g/cm³ and mass 775 g. The aluminum is submerged in a container of oil of density 0.650 g/cm³. A spring balance is attached with string to the piece of aluminum. What reading will the balance register in grams (g) for the submerged metal?

A. 960 g

B. 775 g

C. 588 g

D. 190 g

35. A block of wood has density 0.50 g/cm³ and mass 1 500 g. It floats in a container of oil (the oil's density is 0.75 g/cm³). What volume of oil does the wood displace?

A. 3 000 cm³

B. 2 000 cm³

C. 1 500 cm³

D. 1 000 cm³