Asimply supported wood beam of rectangular cross section and span length 1.2 m carries a concentrated load p at midspan in addition to its own weight (see gure). the cross section has width 140 mm and height 240 mm. the weight density of the wood is 5.4 kn/m3 . calculate the maximum permissible value of the load p if (a) the allowable bending stress is 8.5 mpa and (b) the allowable shear stress is 0.8 mpa.

it is b

explanation:

0.3x0.21x0.08kg=mass 1 sheet

mass 500 = 500xmass 1

volume pile = 0.3x0.2x0.048

density=mass/volume= 500xmass 1/0.3x0.2x0.048

v patient student

explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​