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Physics (5th Edition)
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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_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_forwardA 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_forward
- A 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_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_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
- A bar of length 100 cm is supported at its two ends. The breadth and depth of bar 5 cm and 0.5 cm respectively. A mass of 100 gm is suspended at the centre of bar. Compute the depression produced in the bar (Y = 4 × 1010 N /m²).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_forwardAn 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_forward
- You use a millimeter ruler to measure the height of a rail curb. The bottom of the ruler is resting on the table. The place where the height measurement is taken is a little curved, so it is difficult to identify very precisely where the measurement should be taken. Also, it's a bit tricky to make sure the ruler is perfectly vertical (it might be leaning forward or backward a bit). When you take the measurement, you measure 12.9 mm. By moving the ruler a little, you are confident that the correct measurement is somewhere between 12.7 mm and 13.3 mm. Indicate the value that you will record in your logbook, as well as the uncertainty that you will attribute to it. Give your answers in mm. Warning: Keep at least 3 significant digits in your answers, even if it does not respect the rules of presentation of data in the laboratory.arrow_forwardScenario #3: Sepak Takraw, known as kick volleyball, is a traditional sport played in Southeast Asia. Players use their feet, knees, and chest to hit a ball over a net, and they score points if their opponents do not return the ball. The balls are traditionally woven from palm vines, and they have a radius of 8 cm, a cross sectional area of 0.02 m², and mass of 0.18 kg. For this problem, assume the ball is kicked with a speed of 22 m/s. Multiple Choice Questions 5) What is the drag force on the 22 m/s ball? Assume they are at sea level and the drag coefficient is 0.35. a) I N b) 2 N c) 3 N d) 4 N 6) If the ball starts from rest and the player kicks it to a speed of 22 m/s, what is the average force of the kick? Assume their foot is in contact with the ball for 20 ms (2 x 10-2 s). a) 100 N b) 200 N e) 5 N 1) 6 N c) 300 N d) 400 N 500 N e) f) 600 N Short Answer Question Sepak Takraw players are remarkably athletic and can jump to impressive heights in order to kick the ball. Suppose a…arrow_forwardFind the minimum diameter of a (50 m)-long nylon string that will stretch no more than (1 cm) when a load of (70 kg) is suspended from its lower end. Assume that the Young modulus .equals to 3.51*10° N/m? 3.35 cm 3.53 cm O 33.5 cm O 35.3 cm Oarrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
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