Answer question 22 and 24. Answer: A dentist's chair with a person in it weighs 1950 N. The output plunger of a hydraulic system starts to lift the chair when the dental assistant's foot exerts a force of 49 N on the input piston. Neglecting any difference in the heights of the piston and the plunger, what is the ratio of the area of the plunger to the area of the piston?

22. [0/2 Points] DETAILS PREVIOUS ANSWERS OBINPHYS8 4.CQ.025. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Use the following table to determine which of the other materials from the list would float if placed in a container of ethyl alcohol. Select all correct answers. Density Substance (kg/m) concrete 2,500 copper 8,930 ebony wood 1,200 ethyl alcohol 791 juniper wood 560 Styrofoam 37 concrete copper O ebony wood juniper wood Styrofoam None of the above materials would float; they are all solids and would sink in a liquid. x Need Help? Read It Submit Answer 23. [2/2 Points] DETAILS PREVIOUS ANSWERS OBINPHYS8 4.CQ.026.A. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A person does the back float in a freshwater lake and later does the same in the ocean. In which case is more of the person's body above the water line? The person will float with more of her body above water in the ocean. The person will float with more of her body above water in freshwater Since both situations involve the person floating in a solution that is primarily water, there will not be a difference between the two cases. Correct. The density of seawater is about three percent higher than that of pure water. This means that it would take a smaller volume of displaced water to have the same weight, thus providing the necessary buoyant force to allow the person to float. Need Help? Read It Submit Answer 24. [0/2 Points) DETAILS PREVIOUS ANSWERS OBINPHYS8 4.CQ.026.B. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A metal bowl with a weight of 1.30 N is placed in a larger kitchen container filled with castor oil. How much castor oil must the bowl displace in order to float? For reference, the mass density of castor oil is about 961 g/liter and its weight density is about 9.42 N/liter. Please give your answer in liters. 0.159 X liters Need Help? Read It Submit Answer ]