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Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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
Transcribed Image Text:Q2 A sluice gate weighing (1.8tonnes) is raised and lowered using a square thread
screw. The frictional resistance induced by water pressure against the gate when it
lowers its position is 400Kg. The outside diameter of the screw is (6cm) and the pitch
is (1cm). The outside and inside diameters of the washer are (15cm and 5cm)
respectively. The coefficient of friction between the screw and nut is (0.1) and
between the washer and seat is (0.12). Requirements: 1) Calculate the maximum
force to be exerted at the end of the lever for raising and lowering the gate. 2)
Efficiency of arrangement. 3) Number of thread and height of the nut, an allowable
bearing pressure is 70Kg/cm².
HA
Thrust
washer
Nut
Screw
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- 1:E1 A docs.google.com/for Untitled Section Determine the force P required to lower the 40-kg cylinder at a slow steady speed. The coefficient or friction between the cord and its supporting surface is 0.30. (g-10 m/s³). 40 kg Your answer If (4, =0.4) then the o between the normal force N and the friction force F will be Your answer العربية الإنجليزية IIIarrow_forwardA certain car traveling at 97 km/hkm/h can stop in 49 mm on a level road. Determine the coefficient of friction between the tires and the road. Assume that the car starts skidding the moment the driver hits the brakesarrow_forwardYour engineering firm is asked to specify the maximum load for theelevators in a new building. Each elevator has a mass 490 kg when empty and maximumacceleration 2.24 m/s2. The elevator cables can withstand a maximum tension of 19.5 kN beforebreaking. For safety, you need to ensure that the tension never exceeds two-thirds of that value.What is the maximum load that the elevator can safely carry? How many70-kg people is that?Briefly but clearly explain the reasoning for your choice of the sign of the acceleration.arrow_forward
- Crate coef of static friction is .55, what is min force to prevent slipping, what is min force to prevent tippingarrow_forwardA crate, which has a weight of W, is placed on an inclination. The force P is applied to prevent the crate from sliding down the inclination. a) Determine the minimum required force P, if the coefficient of static friction is u31. b) Determine the friction force (in magnitude) acting at the bottom of the crate if the force P=P1 and the coefficient of statie friction is µs1. c) Determine the minimum required force P, if the coefficient of static friction is u32. Use W=450 N, a=35°, us1=0.4, Hs2=0.75 and P=115 N. The minimum required force P in N is (if the coefficient of static friction is µs1) (round to the nearest integer): N The magnitude of friction in N is (if the force P-P, and the coefficient of static friction is u1) (round to the nearest integer): N The minimum required force P in N is (if the coefficient of static friction is µs2) (round to the nearest integer): Narrow_forward
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