The settled life time of a molecule with a radius of 25 nm is 21.8 nsec. Calculate the root mean square movement of this molecule in 3 seconds. The shape of the
molecule is spherical

The mass of the sun is 1.99×1030kg and its distance to the earth is 1.50×1011m. what is the gravitational force of the sun on the earth?

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.

Use 4 to 5 complete sentences, explain the concepts of beats and how beats are produces.