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22 October, 23:33

1. Strzała o masie 20 g tuż po wystrzale ma prędkość 50 m/s. Oblicz pracę wykonaną

przez zawodniczkę. Ile wynosi energia potencjalna sprężystości napiętej cięciwy?

2. Na trampolinę o współczynniku sprężystości k=2 kN/m stanął zawodnik o masie 80 kg. O ile obniży się krawędź trampoliny?

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Answers (1)
  1. 23 October, 00:32
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    Question 1

    An arrow weighing 20g shortly after firing has a speed of 50m / s. Calculate the work done by the athlete. What is the potential energy of the elasticity of the tensed string?

    mass m = 20g = 20/1000 = 0.02kg

    speed v = 50m / s

    P. E = K. E = ½mv²

    P. E = ½ * 0.02 * 50²

    P. E = 25 J

    work done = P. E = 25J

    Qestion 2

    A 80 kg athlete stood on a trampoline with a coefficient of elasticity of k = 2 kN / m. As far as the edge of the trampoline lowers.

    force of elasticity

    F = - kx

    x = F / k

    in our case F will be the force of pressure or gravity

    F = mg

    g is gravitational acceleration, and according to Newton's second law, acceleration is force through mass - unit of force N, unit of mass kg. Acceleration either in m / s ^ 2 or N / kg

    F = 80kg * 10N / kg = 800 N

    x = 800N / - 2000N = - 0.4

    The trampoline will lower, so from the level by 0.4 meters and hence this minus
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