What are electrons? ?
what is negative and positive electrons

Arrange the images in order to show how lake-effect snow occurs.

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.

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?