Air is blown at the mouth of a tube (Length 25 cm and diameter 3 cm) closed at one end. Velocity of sound is 330 m/s. the sound which is produced will correspond to the frequencies(a) 330 Hz(b) Combination of frequencies 330, 660, 990, 120, 1650 Hz(c) Combination of frequencies 330, 990, 1650, 2310, Hz(d) Combination of frequencies 300, 900, 1500, 2100, Hz

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consider the figure of a single riveted lap joint as follows

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cyclic heat engine operates between. temperature of 30 C. What is the least rate of heat rejection per kW net output of an engine. source temperature of 800 C and sink

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