The nucleus of 8 be, which consists of 4 protons and 4 neutrons, is very unstable and spontaneously breaks into two alpha particles (helium nuclei, each consisting of 2 protons and 2 neutrons). (a) what is the force between the two alpha particles when they are 5.00 3 10215 m apart, and (b) what is the initial magnitude of the acceleration of the alpha particles due to this force? note that the mass of an alpha particle is 4.002 6 u.

half of a circle

explanation:

the arrow and the top of the circle is matching together. it is not a polygon because a polygon would always be the same shape. therefore, an half of a circle is called semicircle so you would find the radius of it.

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

see earlier

im guessing the west of station b