According to Hooke's Law, the force required to hold the spring stretched x m beyond its natural length is given by f(x) = kx, where k is the spring constant. Suppose that 5.4 J of work is needed to stretch a spring from 14 cm to 20 cm and another 9 J is needed to stretch it from 20 cm to 26 cm. Find the exact value of k, in N/m. k= N/m What is the natural length of the spring, in cm? cm

70 Energy (Joule) ☎ 8 8 8 8 8 8 50 30 10 o S2FRT820 $2FRT730 AS2FRT650 S2HT940 o $2HT1150 0 -200 -150 S2FRT820 O -100 + S2HT940 A -50 0 Temperature (°C) O O S2FRT730 ... S2FRT650 $2HT1150 50 100 The figure shown corresponds to the absorbed energy of different ferritic steels in a temperature range of 1. What is the ductile-brittle transition temperature of S2FRT730 steel? 2. If a component will work at -50°C, what materials (from those shown) would you use to manufacture it? EXPLAIN YOUR ANSWER.

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Thermodynamics. Help me to answer this question  By referring to the thermodynamics tables, calculate the missing properties in the following table and determine the phase for each subtance.