Q1) What are Plimsoll lines? In which water will a ship sink more “Sea water or River water”.
Q2) Out of Solid,Liquid and gases, in which state/states of matter can convection currents take place?
Answers
Answer:
its easy
Explanation:
1)Density of sea water is more than that of river water. Consequently, as per law of flotation, in order to balance the weight of the ship, more volume of water is required for the river water having lower density to displace it.
2)in gases convection currents take place.
Explanation:
Why is it easier to sail a boat in sea water than in river water?
Answer
I am going to disagree with all the below answers - BUT not professionally or theoretically, just on the practical part of actually sailing.
A river “might be” 200–400 feet across, maybe 1–2 kilometers if at its last opening into a bay or ocean. Otherwise, you can ONLY SAIL in 200 feet, then you must tack and change course and change sails and boom to go about and continue another 200 feet to go upriver 100 feet against the current - which has swept you downriver 150 feet all this time. Then tack again and come about and come to a new course where you might be able to make 400 feet upriver and almost around the bend and then have to fight the current in the bend, the new wind changes as it curves around the trees and cliffs above the bend, and then the course change itself as you try to cut across (again) to make any headway at all!
Nope. On an open salt water bay, you can make three-four-five-three hundred miles continuous sailing with a far greater chance of finding continuous winds. Yes, with greater maintenance and the need to clean the boat.
Q. Out of Solid,Liquid and gases, in which state/states of matter can convection currents take place?
Ans. Convection (illustrated in ) is the concerted, collective movement of ensembles of molecules within fluids (e.g., liquids, gases). Convection of mass cannot take place in solids, since neither bulk current flows nor significant diffusion can occur in solids.