Помогите плз! Железный гвоздь нагрели на плите:

- Как изменилась скорость движения молекул железа?

- Как изменится скорость движения молекул, если гвоздь опустить в холодную воду?

- Как при этом изменится скорость движения молекул воды?

- Как меняется объем гвоздя при этих опытах?​

A1200 kg car traveling north at 10 m/s is rear-ended by a 2000 kg truck traveling at 30 m/s. what is the total momentum before and after the collision?

Astudent wears sunglasses to her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses? a polarization b.refraction c.diffraction d. interference

It's a snowy day and you're pulling a friend along a level road on a sled. you've both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. you've been walking at a steady 1.5m/s, and the rope pulls up on the sled at a 32 ∘ angle. you estimate that the mass of the sled, with your friend on it, is 65 kg and that you're pulling with a force of 80 n .