какую энергию нужно затратить, чтобы расплавить кусок свинца массой 8 килограмм , взятый при температуре 27 градусов ? удельная теплота плавления свинца 0,25* 10^5Дж/кг температура плавление свинца 327градусов

An artificial satellite circles the earth in a circular orbit at a location where the acceleration due to gravity is 6.03 m/s^2. determine the orbital period of the satellite.

The two stars in a certain binary star system move in circular orbits. the first star, alpha, has an orbital speed of 36 km/s. the second star, beta, has an orbital speed of 12 km/s. the orbital period is 137 d. a) what is the mass of the star alpha? b) what is the mass of the star beta?

What equation is used to calculate the weight of an object on a plant ?