18) Base your answer on the flowchart below and on your knowledge of Earth science. The
flowchart represents possible pathways in the evolution of stars.
Black hole
More massive
main sequence
star
Supergiant
Neutron star
Nebula
(gas cloud
of molecules)
Protostar
(forming star)
Less massive
main sequence
star
Giant
White dwarf
Based on this flowchart, identify the characteristic of a main sequence star that determines
whether the star becomes a giant or a supergiant.

Which two particles are found in the center of an atom

Aperson walks first at a constant speed of 4.89 m/s along a straight line from point a to point b and then back along the line from b to a at a constant speed of 2.95 m/s. what is the average speed over the entire trip?

Ahair dryer is basically a duct in which a few layers of electric resistors are placed. a small fan pulls the air in and forces it through the resistors where it is heated. air enters a 1200 w hair dryer at 100 kpa and 22°c and leaves at 47°c. the cross-sectional area of the hair dryer at the exit is 60 cm2. neglecting the power consumed by the fan and the heat losses through the walls of the hair dryer, determine (a) the volume flow rate of air at the inlet and (b) the velocity of the air at the exit.