a compound strip of brass and iron 10cm long at 20c is held horizontally with the iron uppermost. when heated from below with a bunsen burner. the temperature of the brass is 820c and that of the iron is 770c. calculate the difference in length of the iron and the brass( coefficient of linear expansion of brass and iron are 0.000019c and 0.000012c respectively ​

What is the maximum acceleration of the wing tips, in units of g?

There are two-speed cameras, one in an are where the speed limit is 30 km/h and another where the speed limit is 50 km/h. in which will there be a smaller time interval between the photographs? explain your answer.

Consider each of the electric- and magnetic-field orientations given next. in each case, what is the direction of propagation of the wave? a)\vec ein the +xdirection,\vec bin the +ydirection. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction b)\vec ein the -y direction,\vec bin the +x choose+ x direction- x direction+ y direction- y direction+ z direction- z direction c)\vec ein the +z direction,\vec bin the -x direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction d)\vec ein the +y direction,\vec bin the -z direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction