24. wzrośnie 4 razy
[tex]E_{p} = m\cdot g\cdot h\\\\E_{p_1} = m\cdot g\cdot 4h = 4m\cdot g\cdot h = 4E_{p}[/tex]
25. η = 70%
[tex]\eta = \frac{P_{u}}{P_{d}} \cdot100\% = \frac{3500 \ W}{5000 \ W} \cdot100\% = 0,7\cdot100\% = 70\%[/tex]
