7. When a boat sails from salt water to fresh water, the boat will float A) lowe

Question

7. When a boat sails from salt water to fresh water, the boat will float A) lower in the water. B) higher in the water. C) at the same water level. 8. If the part of an iceberg that extends above the water were suddenly removed, the A) iceberg would sink. B) buoyant force on the iceberg would increase. C) buoyant force on the iceberg would decrease. D) density of the iceberg would increase. E) pressure on the bottom of the iceberg would increase. 9. A hydraulic press multiplies a force by 100. This multiplication is done at the expense of: A) energy, which is divided by 100. B) the distance through which the force acts (which is multiplied by 100). C) the time through which the force acts, (which is multiplied by 100). D) the mechanism providing the force. E) none of these 10. The weight of a solid metal object in air is 25 N and the apparent weight in water (p=1g/cm^3) is 20 N. It's density is A) 1 g/cm3 B) 2 g/cm3. C) 5 g/cm3 D) 10 g/cm3 E) 20 g/cm3

Explanation / Answer

A)higher in the salt water

In more salty water, the ship will float higher on the water,because salt water has more buoyancy that fresh water .

B)buoyant force on the iceberg would decrease,because the overall mass of the iceberg is now smaller.

C)the distance through which the force acts

because The multiplication in force is achieved by a division of distance traveled

D) Fbuoyant (Fb) = 25N-20N=5N

  the difference in the air/apparent weights is the buoyant force of water

weight of water displaced = rho(water) x g x Volume

5=1*980*V (value of g will be in cm/s^2 i.e  980cm/s^2

V=0.00510 cm^3

volume of displaced water = mass x density of water

W=mg

25/9.8=m

0.0255 g=M

density of the object = m/V

=0.0255/0.00510

density of the object =5gm/cm^2

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