La tuta spaziale lunare, usata dagli astronauti nel- la missione Apollo 11 del 1969 , aveva una massa di \( 91,0 \mathrm{~kg} \). Calcola il peso della tuta sulla Terra e sulla Luna \( \left(G_{l}=1,62 \mathrm{~N} / \mathrm{kg}\right) \). Determina quale massa dovrebbe avere la tuta delle future missioni su Marte affinché su Marte abbia lo stesso peso lunare della tuta della missione Apollo 11 \( \left(g_{M}=3,72 \mathrm{~N} / \mathrm{kg}\right) \).

A mass on a spring bobs up and down, completing 2 full cycles every second. What are the period and frequency of the mass?

11.2 มวล \( \mathrm{m}=200 \mathrm{~kg}, \mathrm{a}=5.0 \mathrm{~m} / \mathrm{s}^{2} \)

81 point Heavy but sensitive equipment (like hifi equipment), often have spring-loaded legs to dampen external vibrations. Consider an amplifier of mass 29.5 kg resting on a flat table. The amplifier has 4 feet, each consisting of identical springs of spring constant \( 16.4 \times 10^{3} \mathrm{~N} / \mathrm{m} \). By how much (in mm) are each of the springs in the feet compressed?

Ex 26 (Pec9) จากรูป นำเชือกผูกกับก้อนน้ำหนัก \( W \) จงหาอัตราส่วนของขนาดของแรงดึงในเส้นเชือก \( T_{1} \) ต่อ \( T_{2} \) กำหนด \( \sin 53^{\circ}=4 / 5, \sin 37^{\circ}=3 / 5 \)

\begin{tabular}{l} Look at the electrical diagram. \\ \( I_{R 1}=0.7 \mathrm{~A} \) \\ \( R 1=3.8 \Omega \) \\ Calculate the source voltage. \\ \hline 2.66 \\ \hline OK. \\ \begin{tabular}{l}\( I_{R 1}=0.8 \mathrm{~A} \) \\ \( R 1=4.7 \Omega \) \\ Calculate the source voltage. \\ \hline\end{tabular} \\ \hline\end{tabular}