ALOT OF POINTS What is the best description of the acceleration of an object? A: A runner travels 100 m in one minute.
B: A cars velocity changes from 25 m/s to 20 m/s in 5 seconds.
C: An airplane changes elevation from 10,000 ft to 5,000 ft.
D: A remote-controlled car speeds up from 0 m/s to 15 m/s.

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 ?

Energy is the ability to do work which measures what

*drag each tile to the correct location in the sequence* the table shows chronological events in the life of our sun, a medium-sized star. place the missing events into the correct rows of the table.