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    dragon_122's Avatar
    dragon_122 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 31, 2007, 08:27 PM
    Power of toy car
    I need help for my phy test!

    The question goes like this,

    A car of mass 800kg has an engine which deliver a power of 160kW. What is the minimum time which the car can be accelerated from rest to 20m/s?
    terryg752's Avatar
    terryg752 Posts: 197, Reputation: 4
    Junior Member
    		  
    #2

    Dec 31, 2007, 11:37 PM
    Points to remember:

    Power = Work per unit time

    Work = Change in kinetic energy

    In this case:

    Change in Kinetic Energy = 1/2 m v^2 (m = 800, v = 20)

    = 160000

    Work done = Change in Kinetic Energy = Power times time

    Let time = t

    Power = 160K = 160000 Jouls per second

    Suppose time required = t

    Power times time = 160000 t = Change in Kinetic Energy = 160000

    t = 1
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