 Lv 184 points

# clau

• ### Finding height of container through the density of liquids?

The container is filled with equal masses of water and oil. The oil floats on top of water (density 1000 kg/m3), and the open surface of the oil is at a height h above the bottom of the container. What is the height h if the pressure at the bottom of the water is 400 kPa greater than the pressure at the top of the oil? Assume the oil density is 600 kg/m3. The height = hoil + hwater.

Hint: Express the volumes of oil and water in cylinder in order to get the relationship between the height of the fluid and its density. Note that density = mass / Volume. Remember m of oil = m of water.

• ### Fluid Dynamics?!?

The longer a straw, the harder it is to drink from. If the air pressure is 91200 Pa, and if you could create a perfect vacuum in your mouth, what is the maximum length of a straw that you could still drink from? Density of water: 1000kg/m^3. Ignore capillary effects.

• ### Finding value of Force?

A uniform strut (i.e. a beam! I like to use fancy words!) of 130 kg is fixed on the ground by a hinge. The cable is attached at the other end and a 225 kg mass is also attached at the end.

I found the tension at 7772.4N and the horizontal component of the force exerted by the hinge on the strut at

6731.1 N. I can't find the vertical component of the force exerted by the hinge on the strut. I thought that because the angle is at 45deg, it would be the same as the x-component, but I got the answer wrong.

What am I doing wrong?

Physics2 years ago
• ### Finding Force of Tension?

A string is attached to a wooden plate as shown. It exerts a 10 N force on the plate. What is tension in cartesian form?. (Fx-comp, Fy-comp, Fz-comp)