Śmigłowiec o masie 11t w czasie 5s wzniósł się pionowo na wysokość 25m. Jeżeli leciał ruchem jednost.... Question from @zac56

October 2018 1 240 Report

Śmigłowiec o masie 11t w czasie 5s wzniósł się pionowo na wysokość 25m. Jeżeli leciał ruchem jednostajnie przyspieszonym, to jego silniki wykonały pracę ...?

Marco12

m = 11t = 11 000kg

t = 5s

h = 25m

s = at²/2

a = 2s/t²

a = 2 x 25m/(5s)² = 2m/s²

W = mgh + mga

W = mh(g+a)

W = 11 000kg x 10N/kg(10m/s² + 2m/s²) = 110 000N x 12m/s³ = 1320000J = 1,32MJ

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