Construct as a star dies, it becomes denser.
its temperature rises to a point where
helium (he) nuclei fuse with other nuclei.
when this happens, the atomic numbers of
the other nuclei are increased by 2 because
each gains the two protons contained in
the he nucleus. for example, chromium
(cr) fuses with he to become iron (fe).
copy and complete the concept map
showing the first four steps in he fusion.

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.

Two trains leave a station at the same time, train a travels at a constant speed of 16 m/s. train b starts at 8.0 m/s but accelerates constantly at 1.0 m/s squared. after 10.0 seconds, which train has the greater speed?

Contains chemical energy. a. heat b. light c. natural gas