kinematics_tut

# kinematics_tut - Exercises for Chapter 1 Kinematics 1. An...

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E1 Exercises for Chapter 1 Kinematics 1. An impulsive retarding force of 3 seconds duration acts on a particle which is moving with a forward velocity of 60 m/s. The oscilloscope record of the deceleration is shown. Determine the approximate velocity of the particle at t = 9 s. [answer: -58 m/s] 2. A car can decelerate at 0.8 ‘g’ on a certain road. Find the total emergency stopping distance measured from the point where the driver first sights the danger for a speed of 100 km/hr. The time taken for the driver to identify the hazard, decide on a course of action, and apply the brakes is 0.75 s. [Answer: 70 m] 3. An underground train on the Mass Transit Railway moves away from a station with an initial acceleration of 0.9 m/s 2 . The acceleration decreases uniformly with time until after half a minute it is 0.3 m/s 2 . Calculate the speed reached and the distance travelled during this time. [Answer: 18 m/s, 315 m] 4. The magnitude of the acceleration and deceleration of an express lift is limited to 0.4 ‘g’, and the maximum vertical speed is 400 m/min. Calculate the minimum time required for the lift to go from rest at the 10 th floor to a stop at the 30 th floor, a distance of 100 m. [Answer: 16.7 s]

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## This note was uploaded on 09/24/2011 for the course ENGG engg1010 taught by Professor Wong during the Spring '11 term at HKU.

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kinematics_tut - Exercises for Chapter 1 Kinematics 1. An...

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