A quarter car model of an automotive vehicle suspension system is shown in Figure Q2 below, where k, is the suspension stiffness, the sprung mass of a quarter of the vehicle, k₂ the tyre stiffness, and m₂ the unsprung mass, or wheel mass. Write the system equations of motion in matrix form, and hence find the first system natural frequency ie th lower value, in Hz. The system parameters are k₁ = 24.4 kN/m, m₁ = 257.5 kg, k₂ = 83.2 kN/m, and m₂ = 28.8 kg. Give your answer to 3 sf. k₂ Tire stiffness m Car mass tunt k Car spring m₂ Wheel mass

Quèstion 25 Which of the following describes the effect of shot peening on fatigue life? O A. It has no effect on fatigue life O B. It decreases fatigue life because of increased surface hardness O C. It increases fatigue life because of induced compressive stresses D. It decreases fatigue life because of excessive surface deformation A Moving to another question will save this response. 34°C äolo claw ENG 4)

Q2) Choose the correct answer for only 15 (fifteen) of the following. is about 67% of the total forces. A) Longitudinal force. 1) In turning operation, the force. E) thrust force. B) Radial C) feed force. D) cutting force. (C) 2) Which one of the following materials has the lowest hardness: (a) aluminum oxide, (b) cubic boron nitride, f) none of the previous answers. high-speed steel, (d) titanium carbide, or (e) tungsten carbide Which one of the following operations is generally capable of the closest tolerances: (a) broaching. (b) drilling, (c) end milling, (d) planning, or (e) shaping. F) none of the previous answers. 3)

The answer is one of the options below please solve carefully and circle the correct option Please write clear .

What is internal force?