While doing an experiment in Chemistry, you placed in an open test tube a 0.10- m deep layer of vegetable oil on top of water that is 0.15 m deep. The density of the oil is 920 kg/m3. What is the pressure at the surface of the oil layer? a. What is the gauge pressure at the oil-water boundary? b. What is the absolute pressure at the bottom of the test tube?
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- An airplane is pressurized with air to 650 mmHg. a. If air is 21% oxygen, what is the partial pressure of oxygen on the plane? b. If the partial pressure of oxygen drops below 100 mmHg, passengers become drowsy. If this happens, oxygen masks are released. What is the total cabin pressure at which oxygen masks are dropped?6. A 100 cc block of Styrofoam (density 100 kg/m³) is held by a massless string, attaching the bottom of the block to the bottom of the vat, in a vat of water (density 1 gm/cc) as shown in the diagram. А. I Sketch and label the forces (with a brief description) on the free body diagram for the Styrofoam block? В. What is the tension in the string?A sea exhibit at an aquarium is 24 meters long and 11 meters deep with a glass wall. It is open to the air at the very top. i. What is the total pressure at the top of the tank (including atmospheric pressure)? ii. What is the total pressure at the bottom of the tank (including atmospheric pressure)? iii. The other side of the glass wall is at atmospheric pressure. What is the total net force on the wall? (hint: the pressure changes linearly as a function of depth, so you can use the average pressure to find the force)
- 1. If an immersed object displaces 8 N of fluid, what is the buoyant force on the block?EXPLAIN. 2. How should you place a screw on a table such that it exerts the smallest pressure against it?.EXPLAIN WHY. 3. An object with a volume of 100cm^3 is submerged in a swimming pool. What is the volumeof water displaced?. Why?. 4. You apply a flame to 1 L of water for a certain time and its temperature rises by 2°C. If youapply the same flame for the same time to 2L of water, by how much does its temperaturedecrease? . Why? 5. Which has greater kinetic energy? A) a car traveling at 30 km/hr. B) a car of half the mass traveling at 60 km/hr C) both the same. D) need more information EXPLAIN. 6. A melon is projected into the air with 100 J of kinetic energy in the presence of air resistance.When it returns to its initial level its kinetic energy isA) less than 100 J.B) more than 100 J.C) 100 J.D) need more informationEXPLAIN 7. Two identical golf carts move at different speeds. The faster cart…Bird bones have air pockets in them to reduce their weight—this also gives them an average density significantly less than that of the bones of other animals. Suppose an ornithologist weighs a bird bone in air and in water and finds its mass is 45.0 g and its apparent mass when submerged is 3.60 g (the bone is water light) a. What mass of water is displaced? b. What is the volume of the bone? c. What is its average density?You have three objects of varying shapes and sizes: Object 1 is a rectangular block of tin. Object 2 is a cube of aluminum. Object 3 is a sphere of copper. a. the density of tin is 5.75g/cm2. What is the mass of object 1 in kg if the rectangular block has a volume of 1.34L? b. what is the volume in cubic inches of object 2 if the cube of aluminum 7.58 inches on a side? c. what is the mass in kg of object 2? the density of aluminum is 2.70g/cm3 d. what is the volume in cm3 of object 3 if the sphere of copper has a diameter 8.62cm? the volume of the sphere is 4 {pi}^3/3 e. what is the mass in kg of object 3? Copper has a density of 8.96g/cm3
- A 1mm diameter glass bread is dropped into a cylinder of oil at room temperature. It falls 25 cm to the bottom in 60s at constant speed. The glass and oil have densities of 2500 kg/m^3 and 900 kg/m^3, respectively. A. What is the mass of the bead? B. What is the viscosity of the oil? C. Would you expect the time fall to increase, decrease, or remain the same if the oil was heated up first?A 57kg object with a volume of 0.04m3 is dropped into a fresh water lake, which has a density of 1000kg/m3. a. What is the object's force of gravity? b. What is the buoyant force on the object? c. Based on your answers from a) and b), will it float or sink?A ball with a mass of 2000 g is floating on the surface of a pool of water. What is the minimum volume that the ball could have without sinking below the surface of the water? (Note that water has a density of 1.00 g/cm³.) A. 2 cm³ B. 1000 cm³ C. 2000 cm³ D. 9.8 cm³ 4
- BThe same fluid (density unknown) fills three depressions on an alien planet. Depression #1 is a small pond. Depression #2 is a large lake. Depression #3 is a very large ocean. All of these depressions have the same depth. Gravity g is the same at all three locations. However the value of gravity is unknown. How do the gauge pressures at the bottoms of the three depressions compare? A. P3 > P2 > P1 B. They are the same C. P1 > P2 > P3 D. Can't tell without knowing the dimensions of the depressions.