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Q1. A fire hose held near the ground shoots water a speed of 6.50 m/s. At what angles should the nozzle point in order that the water land 2.00 meters away?

Q2. A 15 kg loudspeaker is suspended 2.50 m below the ceiling by two cables that are each 20 degrees from vertical. What is the tension in cables?

Q3. In a simple atom, the electrons making transitions between outermost energy levels and the innermost energy levels give rise to photons with the reddest colours?

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