5. a) Ikkita avtomobil bir vaqtda bir-biriga tomon yo'lga chiqdi. Birinchi avtomobil \( 75 \mathrm{~km} / \mathrm{h} \) tezlik bilan, ikkinchi avtomobil esa \( 65 \mathrm{~km} / \mathrm{h} \) tezlik bilan harakatlandi. Agar ular 3 soatdan keyin uchrashgan bo'Isa, ular orasidagi masofa qanday bo'lgan? b) Ikkita mototsiklchi bir vaqtda qarama-qarshi yo'nalishda yo'lga chiqdi. Ular 4 soat yo'l yurib, 800 km masofani bosib o'tdi. Agar birinchi mototsiklchi \( 110 \mathrm{~km} / \mathrm{h} \) tezlik bilan harakatlangan bo'lsa, ikkinchi mototsiklchining tezligini toping.

Question 6/13An air tank is exposed to ambient temperature.If you set the air pressure of the tank to 35 psi for a leak test and find that 24 hours later the tank's pressure has increased, what could've happened?The tank leakedThe tank drew in additional airThe ambient temperature increasedThe ambient temperature decreased

body placed on a rough horizontal level \( W=75 \mathrm{~N} \) horizontal force affected 50 N Makes it about to move en the coefficient of friction equals \( \begin{array}{llll}\text { 1) } \frac{1}{3} & \text { 2) } \frac{2}{3} & \text { 3) } \frac{3}{4} & \text { 4) } \frac{1}{4}\end{array} \)

body hanging by two strings and equilibrium \( T_{2}=60 \mathrm{~N} \) then \( w=\cdots \mathrm{N} \)

Prequnta 3 (4 puntos) Calcular la variación de la energia interna de un bloque de hielo de 520 g que se se encuentra \( 0{ }^{\circ} \mathrm{C} \) y a presionn atmostérica, so funde y luego se calienta a \( 4{ }^{\circ} \mathrm{C} \). Densidad del hielo \( 0.917 \mathrm{~g} / \mathrm{cm}^{3} \), calor latente de fusión \( 3.34 \times 10^{5} \mathrm{~J} / \mathrm{kg} \), densidad del agua a \( 4{ }^{\circ} \mathrm{C} \) es \( 1 \mathrm{~g} / \mathrm{cm}^{3} \).

QUESTION 1: EPICYCLIC GEAR AND GEAR TRAINS An epicyclic gear train has a sun wheel with 24 teeth, and two planetary wheels of 46 teeth each, The latter mesh with the internal teeth of a fixed annulus with 116 teeth. The input shaft, carrying the sun wheel, transmits \( 4,5 \mathrm{~kW} \) at \( 280 \mathrm{r} / \mathrm{min} \). The output shaft is connected to an arm L that carries the planetary wheels. Calculate the speed of the output shaft.