kinetic energy and momentum during the firing of the rocket. Discuss the significance of this statement in relation to the laws of conservation of energy and momentum, explaining the essential difference hetween' these two quantities. (e) Á bird of mass 0.50 kg hovers by beating its wings of effective area 0.30 m (1) What is the upward force of the air on the bird? (ii) What is the downward force of the bird on the air as it beats its wings? (iii) Estimate the velocity imparted to the air, which has a density of 1.3 kg m ', by the beating of the wings.
kinetic energy and momentum during the firing of the rocket. Discuss the significance of this statement in relation to the laws of conservation of energy and momentum, explaining the essential difference hetween' these two quantities. (e) Á bird of mass 0.50 kg hovers by beating its wings of effective area 0.30 m (1) What is the upward force of the air on the bird? (ii) What is the downward force of the bird on the air as it beats its wings? (iii) Estimate the velocity imparted to the air, which has a density of 1.3 kg m ', by the beating of the wings.
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