How Does Water Affect the Weight of a Submerged Aluminum Plate?

[autoguy]

A diver finds a rectangular aluminum plate having dimensions 1.0m x 2.0m x 0.03m. A hoisting cable is lowered from the ship and the diver connects it to the plate. The density of aluminum is 2.7 x 10^3 kg/m^3. Ignore the effects of viscosity.Calculate the tension in the cable if it lifts the plate upward at a slow, constant velocity.

 

[Kurdt]

What have you tried so far? What things are you going to have to consider?

 

[autoguy]

well i got the volume n the rope is 35m long but other dan that i really don't know were to go

 

[mgb_phys]

Work out the volume of the plate and it's mass.
Then work out the mass of an equal volume of water.

How much less will the plate weigh in water?