Визначте ккд двигуна трактора (у відсотках), яким для виконання роботи 1,89∙106 дж знадобилося 1,5 кг палива з питомою теплотою згоряння 4,2∙106 дж/кг.

What are atoms of the same element with varying number of neutrons

The material that keeps its new shape after it is stretched is called?

Abookcase has a mass of 38 kg and the coefficient of friction between it and the floor is 0.82 what is the maximum force of friction between the bookcase and the floor a 372n b 305n c 412n d 449n