Engineering Mechanics

(^388) „„„„„ A Textbook of Engineering Mechanics Substituting t equal to 0 in equation (iv), a= 6 – 0 = 6 m/s^2 Ans. (2) Time, w ...

Chapter 18 : Motion Under Variable Acceleration „„„„„ 389 * 3 8 dv tt dt =+ ...(ii) *^63 dv vt ds =+ ...(iii) *^22 2 4–8 ds tt d ...

(^390) „„„„„ A Textbook of Engineering Mechanics where C 1 is the first constant of integration. Substituting the values of t = ...

Chapter 18 : Motion Under Variable Acceleration „„„„„ 391 Integrating both sides of equation (i), 32 3210 1 vv += +sC ...(ii) wh ...

(^392) „„„„„ A Textbook of Engineering Mechanics Therefore either s = 0 or (20 – 0.004s^2 ) = 0. A little consideration will sho ...

Chapter 18 : Motion Under Variable Acceleration „„„„„ 393 Integrating both sides of the above equation, 23 2 23 –47.5 26 tt stC= ...

(^394) „„„„„ A Textbook of Engineering Mechanics A body starting from rest, moves in such a way that its acceleration is given ...

Chapter 18 : Motion Under Variable Acceleration „„„„„ 395 Similarly, find the distances travelled by the train at the end of eac ...

(^396) „„„„„ A Textbook of Engineering Mechanics and now substituting initial velocity (u) = 6.78 m/s, acceleration (a) = 2.6 m/ ...

Chapter 18 : Motion Under Variable Acceleration „„„„„ 397 Similarly, in the next 4 sec the mean acceleration 9.6 8.4 9m/s 2 2 + ...

(^398) „„„„„ A Textbook of Engineering Mechanics Similarly, in the next 5 seconds, the distance covered = 100 – 20 = 80 m ∴ Aver ...

Chapter 18 : Motion Under Variable Acceleration „„„„„ 399 EXERCISE 18.3 A tram car, starting with an initial velocity of 7.5 m/ ...

(^400) „„„„„ A Textbook of Engineering Mechanics 400 Relative Velocity 19 CHAPTERCHAPTERCHAPTERCHAPTERCHAPTER Contents Introduc ...

Chapter 19 : Relative Velocity „„„„„ 401 to an observer on the earth, is 50 kilometres per hour. Thus the relative velocity of A ...

(^402) „„„„„ A Textbook of Engineering Mechanics Fig. 19.2. Example 19.1. A train is moving at 48 km. p.h. and a person sitting ...

Chapter 19 : Relative Velocity „„„„„ 403 First of all, draw East, West, North and South lines meeting at O. In the first case, ...

(^404) „„„„„ A Textbook of Engineering Mechanics First of all, draw East, West, North, and South lines meeting at O. In the fir ...

Chapter 19 : Relative Velocity „„„„„ 405 EXERCISE 19.1 A passenger, travelling in a train, observed the drops of rain water to ...

(^406) „„„„„ A Textbook of Engineering Mechanics Join the diagonal XR, which gives the magnitude and direction of the relative ...

Chapter 19 : Relative Velocity „„„„„ 407 Example 19.5. Two ships leave a port at the same time. The first steams North-West at 3 ...