7. A 2.0 kg block on a frictionless table is connected to two ideal massless springs with spring constants k₁ and k₂ whose opposite ends are fixed to walls, as shown in the figure. What is angular frequency of the oscillation if k₁ = 7.5 N/m and k₂ = 5.0 N/m? (A) 2.5 rad/s(B) 3.5 rad/s(C) 0.40 rad/s(D) 0.56 rad/s(E) 1.2 rad/s

10. Two metal rods, one silver and the other copper, are both attached to a steam chamber as shown in the figure, with a temperature of 100°C, at one end, and an ice water bath, with a temperature of 0°C, at the other. The rods are 5.0 cm long and have a square cross-section, 2.0 cm on a side. When steady state has been reached, how much heat flows through the two rods in 1.0 min? The thermal conductivity of silver is 417 W/(m·K), and that of copper is 395 W/(m·K). No heat is exchanged between the rods and the surroundings, except at their ends. (A) 20 kJ(B) 11 kJ(C) 49 kJ(D) 47 kJ(E) 39 kJ

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