1.7 The buoyant force acting on a 10-ton ship floating in the ocean is (2 points

Question

1.7 The buoyant force acting on a 10-ton ship floating in the ocean is (2 points) (a) less than 10 tons. (b) 10 tons. (c) more than 10 tons. (d) depends on density of sea water 1.8 The volume of water displaced by a floating 20-ton boat (2 points) (a) is 20 cubic meters. (b) is the volume of 20 tons of water. (c) is the volume of the boat. (d) depends on the shape of the ship's hull. (e) none of the above 1.9 Approximately how much air is in a column 1 cm2 in cross section that extends from sea level to the top of the atmosphere? (2 points) (a) 1 gram (b) 1 kg (c) 10 kg (d) 100 kg 1.10 An umbrella tends to move upwards on a windy day principally because (2 points) (a) trapped air under the umbrella, warms, and rises (b) buoyancy increases with increasing wind speed (c) air pressure is reduced over the curved top surface (d) all of the above

Explanation / Answer

1.7 boat is floating

so Fnet = Fb - m g = 0

Fb = m g

buoyant force = weight of ship = 10 tons

Ans(b)

1.8 buoyant force = weight of ship = 20 ton

and buoyant force is weight of water displaced.

Ans (b)

1.9 F = P A = (101325 Pa) (1 x 10^-4 m^2) = 10.1 N  

and F = m g

m = 10.1/9.8 = 1 kg  

Ans(b)

2.0 (C)

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