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Q. A certain loudspeaker has a diameter of 45 cm. At what frequency will the wavelength of the sound it emits in air be equal to its diameter?

Q. A small block with a mass of 0.190 kg is attached to a cord passing through a hole in a frictionless, horizontal surface. The block is originally revolving at a distance of 0.50 m from the hole with a speed of 0.90 m/s. The cord is then pulled from below, shortening the radius of the circle in which the block revolves to 0.15 m. At this new distance, the speed of the block is observed to be 3.00 m/s.

What is the tension in the cord in the original situation when the block has speed v_0 = 0.90 m/s?

What is the tension in the cord in the final situation when the block has speed v_1 = 3.00 m/s?

How much work was done by the person who pulled on the cord?

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  • Category:- Physics
  • Reference No.:- M9278541

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