A wooden block is held stationary in a container of water using a string that is attached to both the wooden block and the bottom of the container. [Diagram shows a container of water with a wooden block submerged and held down by a string attached to the bottom.] The wooden block has mass m and volume V. The water has density ρ. The acceleration of free fall is g. What is the magnitude of the force acting on the block due to the tension in the string?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.