Fig. 3(a) shows a train that consists of a 180 Mg locomotive and one hundred 90 Mg hopper cars. The locomotive exerts a friction force of 180 kN on the rails in starting the train from rest. Assuming that there is no slack in the couplers and neglecting friction after the train starts moving, calculate: (i) The force in coupling 1. (ii) The force in coupling 100. 100 99 98 3 2 1 Note the complete train is not shown and the numbers indicate coupler positions

College Physics
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Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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SECTION B
Question 3
(a)
Fig. 3(a) shows a train that consists of a 180 Mg locomotive and one hundred 90 Mg hopper
cars. The locomotive exerts a friction force of 180 kN on the rails in starting the train from
rest. Assuming that there is no slack in the couplers and neglecting friction after the train
starts moving, calculate:
(i)
The force in coupling 1.
(ii)
The force in coupling 100.
100
99
98
3
2 1
Note the complete train is not shown and the numbers indicate coupler positions
Fig. 3(a)
(b)
During a manufacturing operation a tray of product is oscillated under a water spray by the
action of a connecting link AB and crank OB as shown in Fig. 3(b). For the instant when
0 = 15°, the angular velocity of AB is 0.086 rad/s anti-clockwise. Answer each of the
following:
(i)
Draw the velocity diagram for v, =v, +V4 •
(ii)
Find the linear velocity, va, of the tray.
(iii)
Find the angular velocity of the crank OB.
900 mm
300
mm
Fig. 3(b)
Transcribed Image Text:SECTION B Question 3 (a) Fig. 3(a) shows a train that consists of a 180 Mg locomotive and one hundred 90 Mg hopper cars. The locomotive exerts a friction force of 180 kN on the rails in starting the train from rest. Assuming that there is no slack in the couplers and neglecting friction after the train starts moving, calculate: (i) The force in coupling 1. (ii) The force in coupling 100. 100 99 98 3 2 1 Note the complete train is not shown and the numbers indicate coupler positions Fig. 3(a) (b) During a manufacturing operation a tray of product is oscillated under a water spray by the action of a connecting link AB and crank OB as shown in Fig. 3(b). For the instant when 0 = 15°, the angular velocity of AB is 0.086 rad/s anti-clockwise. Answer each of the following: (i) Draw the velocity diagram for v, =v, +V4 • (ii) Find the linear velocity, va, of the tray. (iii) Find the angular velocity of the crank OB. 900 mm 300 mm Fig. 3(b)
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