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Mns U E T M: Mechanical Enginering Department

1) The motorboat travels in a circular path with radius 50m, increasing its speed according to the equation v = (0.8t) m/s. When it has traveled 20m, its velocity is 1.6 m/s and acceleration is 0.8 m/s^2. 2) A car traveling at 100 km/h takes 0.75s for the driver to react and lock the brakes during an emergency stop. The car travels 41.67m before coming to a stop due to a coefficient of kinetic friction of 0.25. 3) A 2-Mg car increases its speed from 0 to 25 m/s in 30s while climbing an inclined road.

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67 views1 page

Mns U E T M: Mechanical Enginering Department

1) The motorboat travels in a circular path with radius 50m, increasing its speed according to the equation v = (0.8t) m/s. When it has traveled 20m, its velocity is 1.6 m/s and acceleration is 0.8 m/s^2. 2) A car traveling at 100 km/h takes 0.75s for the driver to react and lock the brakes during an emergency stop. The car travels 41.67m before coming to a stop due to a coefficient of kinetic friction of 0.25. 3) A 2-Mg car increases its speed from 0 to 25 m/s in 30s while climbing an inclined road.

Uploaded by

Sajid Yasin
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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MECHANICAL ENGINERING DEPARTMENT

MNS UNIVERSITY OF ENGINEERING AND TECHNOLOGY, MULTAN


ENGINEERING MECHANICS DYNAMICS
Quiz No. 2
Attempt all the Questions Time Allowed: 60 minutes

Q.1: Starting from rest the motorboat travels around the circular path, ρ = 50 m, at a speed v = (0.8t) m/s,
where t is in seconds. Determine the magnitudes of the boat's velocity and acceleration when it has
traveled 20 m.

Q.2: The 2-Mg car has a velocity of v1 = 1 00km/h when the driver sees an obstacle in front of the car. If it
takes 0.75 s for him to react and lock the brakes, causing the car to skid, determine the distance the car
travels before it stops. The coefficient of kinetic friction between the tires and the road is µk = 0.25.

Q.3: The 2-Mg car increases its speed uniformly from rest to 25 m/s in 30 s up the inclined road. Determine
the maximum power that must be supplied by the engine, which operates with an efficiency of ε = 0.8.
Also, find the average power supplied by the engine.

Name:
Marks
30
Roll No.: 2019-BT-MECH-55

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