9. Which one of the following is NOT TRUE about the nature and evolution of international relations since the middle ages or medieval period? A. There were two institutions with pretensions to power over the continent as a whole -the Church (Catholic) and the Empire.
B. Outbreaks of severe acute respiratory syndrome (SARS), Corona virus, Ebola virus and Avian flu exemplify how domestic incidents can become international and can lead to foreign policy changes and commitments.
C. The thirty years war concerned about which state should have hegemony (or dominance) over North America.
D. In order to avoid misunderstandings and unnecessary conflicts, the different rulers began dispatching ambassadors to each other's courts 1

Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false

Tom is having a problem with his washing machine. he notices that the machine vibrates violently at a frequency of 1500 rpm due to an unknown rotating unbalance. the machine is mounted on 4 springs each having a stiffness of 10 kn/m. tom wishes to add an undamped vibration absorber attached by a spring under the machine the machine working frequency ranges between 800 rpm to 2000 rpm and its total mass while loaded is assumed to be 80 kg a) what should be the mass of the absorber added to the machine so that the natural frequency falls outside the working range? b) after a first trial of an absorber using a mass of 35 kg, the amplitude of the oscillation was found to be 10 cm. what is the value of the rotating unbalance? c) using me-3.5 kg.m, find the optimal absorber (by minimizing its mass). what would be the amplitude of the oscillation of the absorber?

Cold water (cp=4180j/kg k) leadıng to a shower enters a thin-walled double-pipe heat transfer at 15c at a rate of 0.25kg/s and is heated to 45c by hot water (cp=4190j/kg k) that enters at 100c at the rate of 3kg/s. if the overall heat transfer coefficient is 950w /m2 k , determıne the rate of heat transfer and the heat transfer surface area of the heat exchanger using e - ntu method