придумать 10 уравнений

Вставьте артикли a, an, the, где необходимо: 1. This... pencil is broken. Give me that... pencil, please. 2. I have ... ten programmes on my TV. 3. My friend has... car .... car is broken now. 4. I got... letter from my friend yesterday. ... letter was very long. 5. She has two... daughters and one... son. Her... son is... student. 6. My... brother's... friend has no... dog. 7. This is... house. ... house is white. 8. They have... party. ... party is... birthday party. 9. I read ... good book yesterday. ... book was interesting and funny.

как узнать экспериментально ( не пользуясь весами и мензуркой ) , больше или меньше плотности воды плотность ученичской резинки.

найдите первую космическую скорость для луны,зная,что радиус луны равен 1,7*10^6м(это в 6 степени)и ускорение свободного падения га луне 1,6м/с2(эо в квадрате)