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March 27, 2017

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Calculate the magnitude of the linear momentum for the following cases.
(a) a proton with mass 1.67 10-27 kg, moving with a speed of 4.00 106 m/s

(b) a 16.5 g bullet moving with a speed of 270 m/s

(c) a 70.5 kg sprinter running with a speed of 12.5 m/s

(d) the Earth (mass = 5.98 1024 kg) moving with an orbital speed equal to 2.98 104

  • physics - ,

    If you want something to a power use the little up arrow, upper case 6. For example x^3 is x cubed.
    a)
    1.67 * 10^-27 * 4.00*10^6
    =(1.67*4)* 10^-21
    = 6.68 * 10^-21 kg m/s
    all to three significant figures since 4.00 and 1.67 are three figures

  • physics - ,

    b)
    16.5 g * 10^-3 kg/g = 16.5 * 10^-3 kg = 1.65*10^-2 kg
    270 m/s = 2.70*10^2
    now do (1.65*2.70)* 10^-2 * 10^2
    =4.455*10^0 but we want three significant figures and anything^0 = 1 so
    4.46 kg m/s

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