An object is 60 cm below the surface of a liquid. The pressure due to the liquid at this depth is9000 Pa.What is the density of the liquid?A 15kg/mв 540kg/mC 1500 kg/mD 54000 kg/mA OВCنقطة واحدةA uniform plank rests on a pivot at its centre.Two children P and Q sit on the plank in the positions shown.1.2m1.5mchild Pchild QpivotThe mass of child P is 25 kg.The plank is balanced.What is the mass of child Q?A 20 kgв 25kgC 31 kgD 45kgA OВCD A ball falls from rest through the air towards the ground. The diagram shows two forces acting onthe ball.air resistancegravitational forceAs the ball falls, the air resistance increases.Which statement is correct?AThe acceleration of the ball decreases,BThe acceleration of the ball increases.The speed of the ball decreases.D The gravitational force on the ball decreases.AВCDنقطة واحدةA bullet of mass 0.10kg travels horizontally at a speed of 600 m/s. It strikes a stationary woodenblock of mass 1.90 kg resting on a frictionless, horízontal surface.The bullet stays in the block.What is the speed of the bullet and the block immediately after the impact?A 30m/sB 32m/sC 60m/sD 134m/sAВ

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Description: An object is 60 cm below the surface of a liquid. The pressure due to the liquid at this depth is9000 Pa.What is the density of the liquid?A 15kg/mв 540kg/mC 1500 kg/mD 54000 kg/mA OВCنقطة واحدةA uniform plank rests on a pivot at its centre.Two chil

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An object is 60cm below the surface of a liquid. The pressure due to the liquid at this depth is 9000 Pa. What is the density of the liquid? A 15kg/m в 540kg/m C 1500kg/m D 54000 kg/m A C نقطة واحدة A uniform plank rests on a pivot at its centre. Two children P and Q sit on the plank in the positions shown. 1.2m 1.5m child P child Q pivot The mass of child P is 25 kg. The plank is balanced. What is the mass of child Q? A в 25kg с 45kg A

An object is 60cm below the surface of a liquid. The pressure due to the liquid at this depth is 9000 Pa. What is the density of the liquid? A 15kg/m в 540kg/m C 1500kg/m D 54000 kg/m A C نقطة واحدة A uniform plank rests on a pivot at its centre. Two children P and Q sit on the plank in the positions shown. 1.2m 1.5m child P child Q pivot The mass of child P is 25 kg. The plank is balanced. What is the mass of child Q? A в 25kg с 45kg A

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter15: Fluids

Section: Chapter Questions

Problem 29PQ

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A fluid flows through a horizontal pipe that widens, making a 45 angle with the y axis (Fig. P15.48). The thin part of the pipe has radius R, and the fluids speed in the thin part of the pipe is v0. The origin of the coordinate system is at the point where the pipe begins to widen. The pipes cross section is circular. a. Find an expression for the speed v(x) of the fluid as a function of position for x 0 b. Plot your result: v(x) versus x. FIGURE P15.48 (a) The continuity equation (Eq. 15.21) relates the cross-sectional area to the speed of the fluid traveling through the pipe. A0v0 = A(x)v(x) v(x)=A0v0A(x) The cross sectional area is the area of a circle whose radius is y(x). The widening pan of the pipe is a straight line with slope of 1 and intercept y(0) = R. y(x) = mx + b = x + R A(x) = [y(x)]2 = (x + R)2 Plug this into the formula for the velocity. Plug this into the formula for the velocity. v(x)=A0v0(x+R)2
The gravitational force exerted on a solid object is 5.00 N. When the object is suspended from a spring scale and submerged in water, the scale reads 3.50 N (Fig. P15.24). Find the density of the object. Figure P15.24 Problems 24 and 25.
Liquid toxic waste with a density of 1752 kg/m3 is flowing through a section of pipe with a radius of 0.312 m at a velocity of 1.64 m/s. a. What is the velocity of the waste after it goes through a constriction and enters a second section of pipe with a radius of 0.222 m? b. If the waste is under a pressure of 850,000 Pa in the first section of pipe, what is the pressure in the second (constricted) section of pipe?
Pressure in the spinal fluid is measured as shown in Figure 11.43. If the pressure in the spinal fluid is 10.0 mm Hg: (a) What is the reading of the water manometer in cm water? (b) What is the reading if the person sits up, placing the top of the fluid 60 cm above the tap? The fluid density is 1.05 g/mL. Figure 11.43 A water manometer used to measure pressure in the spinal fluid. The height of the fluid in the manometer is measured relative to the spinal column, and the manometer is open to the atmosphere. The measured pressure will be considerably greater if the person sits up.
Review. The tank in Figure P15.13 is filled with water of depth d = 2.00 m. At the bottom of one sidewall is a rectangular hatch of height h = 1.00 m and width w = 2.00 m that is hinged at the top of the hatch. (a) Determine the magnitude of the force the water exerts on the hatch. (b) Find the magnitude of the torque exerted by the water about the hinges.
(a) What is the density of a woman who floats in freshwater with 4.00% of her volume above the surface? This could be measured by placing her in a tank with marks on the side to measure how much water she displaces when floating and when held under water (briefly). (b) What percent of her volume is above the surface when she floats in seawater?
Gasoline is piped underground from refineries to major users. The flow rate is 3.00102 m3/s (about 500 gal/ min), the viscosity of gasoline is 1.00103 (N/m2) s, and its density is 680 kg/m3. (a) What minimum diameter must the pipe have if the Reynolds number is to be less than 2000? (b) What pressure difference must be maintained along each kilometer of the pipe to maintain this flow rate?
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A 10.0-kg block of metal measuring 12.0 cm by 10.0 cm by 10.0 cm is suspended from a scale and immersed in water as shown in Figure P15.24b. The 12.0-cm dimension is vertical, and the top of the block is 5.00 cm below the surface of the water. (a) What are the magnitudes of the forces acting on the top and on the bottom of the block due to the surrounding water? (b) What is the reading of the spring scale? (c) Show that the buoyant force equals the difference between the forces at the top and bottom of the block.
Figure P15.52 shows a Venturi meter, which may be used to measure the speed of a fluid. It consists of a Venturi tube through which the fluid moves and a manometer used to measure the pressure difference between regions 1 and 2. The fluid of density tube moves from left to right in the Venturi tube. Its speed in region 1 is v1, and its speed in region 2 is v2. The necks cross-sectional area is A2, and the cross-sectional area of the rest of the tube is A1. The manometer contains a fluid of density mano. a. Do you expect the fluid to be higher on the left side or the right side of the manometer? b. The speed v2 of the fluid in the neck comes from measuring the difference between the heights (yR yL) of the fluid on the two sides of manometer. Derive an expression for v2 in terms of (yR yL), A1, A2, tube, and mano. FIGURE P15.52