The ratio of single moveable pulley is 2. why

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

The rocket is fired vertically and tracked by the radar station shown. when θ reaches 66°, other corresponding measurements give the values r = 32700 ft, r¨ = 85 ft/sec2, and θ˙ = 0.019 rad/sec. calculate the magnitudes of the velocity and acceleration of the rocket at this position.

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87