May someone please help? 9. Use the descriptions to identify the three types of thermal energy transfer.
Three types of thermal energy transfer
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Energy transfers from one
object to another by direct
contact
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Energy transfers via the
movement of particles
within a liquid or gas.
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Energy transfers by
electromagnetic waves as
they travel through space or
matter.

Space-time metric ds2= -dt2+at2dx2+bt2dy2+ct2dz2 (a)how does the area of a rectangle with vertices at ( x=0, y=0, z=0 ), (1,0,0 ), ( 0,1,0 ) and (1,1,0 ) changes with time? (b) if a photon moving in the x direction starts from the origin at t=1, when does it reach x=l? (ds=0 for the trajectory of a photon.) (c) the proper time for a particle is defined by cd=ds. what is the proper time for a particle to move along the trajectory ( x(t)=t, y(t)=0, z(t)=0 ) from t=0 to 1 ? what is the condition on the parameter a so that the velocity of the particle never exceeds the speed of light ?

Porque crees que el agua no podia subir mas de 10 m de altura con ese tipo de bomba

Which type of bond is found between the atoms of a molecule? a. metallic b. delocalized electron c. covalent d. ionic