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A steel ball
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- A sluice valve, used in water pipelines, consists of a gate raised by the spindle, which is rotated by the handwheel. The spindle has single start square threads. The nominal diameter of the spindle is 36 mm and the pitch is 6 mm. The friction collar has inner and outer diameters of 32 mm and 50 mm respectively. The coefficient of friction at the threads and the collar are 0.12 and 0.18 respectively. The weight of the gate is 7.5 kN and the frictional resistance to open the valve due to water pressure is 2.75 kN. Using uniform wear theory, determine: (a) torque required to raise the gate; and (2) overall efficiency.arrow_forwarda 300 kg cylinder that is horizontal. Three steel wires support the cylinder from a ceiling.Wires 1 and 3 are attached at the ends of the cylinder, and wire 2 is attached at the center. The wires each have a crosssectional area of 2.00 * 10-6 m2. Initially (before the cylinder was put in place) wires 1 and 3 were 2.0000 m long and wire 2 was 6.00 mm longer than that. Now (with the cylinder in place) all three wires have been stretched.What is the tension in (a) wire 1 and (b) wire 2?arrow_forwardOn a part-time job, you are asked to bring a cylindrical iron rod of density 7800 kg/m^3, length 89.2 cm and diameter 2.45 cm from a storage room to a machinist. Calculate the weight of the rod, w. Assume the free-fall acceleration is g = 9.80 m/s^2. Express you answer in N.arrow_forward
- A 2×12 board is about 2.18 kg per linear foot. A 16-foot length board of Southern Yellow Pine is placed against a wall such that the angle between the wall and the length of the board is 20°. Assume that the wall is perfectly smooth (a.k.a. the coefficient of friction between the wall and the board is zero). (a) What is the normal force between the wall and the board? (b) What is the normal force between the board and the floor? (c) What is the force of static friction between the board and the floor? (d) What is the coefficient of static friction between the board and the floor?arrow_forwardA 330 gram ball is attached to one end of a rubber (Young's Modulus= 0.120 GN/m2) wire of diameter 1.32 mm and an unstretched length of 83.0 cm. The other end of the wire is attached to the top of a post. The ball rotates around the post in a horizontal plane such that the angle between the wire and the horizontal is 10.5 degrees. Find the tension in the wire and the increase in the wire's length due to the tension in the wire. Tension 17.75 Vo N %3D ALength = cmarrow_forwardA 330 gram ball is attached to one end of a rubber (Young's Modulus= 0.120 GN/m²) wire of diameter 1.32 mm and an unstretched length of 83.0 cm. The other end of the wire is attached to the top of a post. The ball rotates around the post in a horizontal plane such that the angle between the wire and the horizontal is 10.5 degrees. Find the tension in the wire and the increase in the wire's length due to the tension in the wire. Tension = ALength cmarrow_forward
- You are applying for a position with a sea rescue unit and are taking the qualifying exam. One question on the exam is about the use of a diving bell. The diving bell is in the shape of a cylinder with a vertical length of L = 2.50 m. It is closed at the upper circular end and open at the lower circular end. The bell is lowered from air into seawater (ρ = 1.025 g/cm3) and kept in its upright orientation as it is lowered. The air in the bell is initially at temperature Ti = 20.0°C. The bell, with two humans inside, is lowered to adepth (measured to the bottom of the bell) of 27.0 fathoms, or h = 49.4 m. At this depth the water temperature is Tf = 4.0°C, and the bell is in thermal equilibrium with the water. The exam question asks you to compare two situations: (i) No additional gas is added to the interior of the bell as it is submerged. Therefore, water enters the open bottom of the bell and the volume of the enclosed air decreases. (ii) The bell is fitted with pressurized air tanks,…arrow_forwardA glass ball of radius 2.00 cm sits at the bottom of a container of milk that has a density of 1.03 g/cm3. The normal force on the ball from the container’s lower surface has magnitude 9.48 * 10-2 N. What is the mass of the ball?arrow_forwardThe largest tendon in the body, the Achilles tendon, connects the calf muscle to the heel bone of the foot. This tendon is typically 12.0 cm long, 5.30 mm in diameter, and has a Young's modulus of 1.65×109 Pa .If an athlete has stretched the tendon to a length of 12.7 cm, what is the tension ? , in newtons, in the tendon? ?= Narrow_forward
- An 10.3-kg stone at the end of a steel (Young's modulus 2.0 x 1011 N/m?) wire is being whirled in a circle at a constant tangential speed of 10.0 m/s. The stone is moving on the surface of a frictionless horizontal table. The wire is 4.54 m long and has a radius of 3.56 x 10-3m. Find the strain in the wire.arrow_forwardGlobal warming is a cause for concern because even small changes in the Earth’s temperature can have significant consequences. For example, if the Earth’s polar ice caps were to melt entirely, the resulting additional water in the oceans would flood many coastal areas. Model the polar ice as havingmass 2.30 × 1019 kg and forming two flat disks of radius 6.00 × 105 m. Assume the water spreads into an unbroken thin, spherical shell after it melts. Calculate the resulting change in the duration of one day both in seconds and as a percentage.arrow_forwardA tow truck is pulling a car out of a ditch by means of a steel cable (Y = 2.0 x 1011 N/m2) that is 9.70 m long and has a radius of 0.466 cm. When the car just begins to move, the tension in the cable is 840 N. How much has the cable stretched?arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning