Puterea dezvoltată de un delfin, care înoată cu viteza de 12km/h, este 100kW. Să se determine :a) forța de rezistență pe care apa o opune înaintării delfinului. b) lucrul mecanic efectuat de delfin în 20 minute.

Aform of energy that is reflected or emitted from objects in the form of electrical and magnetic waves that can travel through space. there are many forms of  electromagnetic  energy including gamma rays, x rays, ultraviolet radiation, visible light, infrared radiation, microwaves and radio waves.

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Assuming you're referring to significant figures, none of these answer choices are shown to be zero as significant digits. did you, by chance, forget to add something?

Dust and gases contract.