At what time of year is the intensity of solar radiation striking each of earth's hemispheres weakest?

What property is a characteristic of a substance that can be observed and does not change the identity of the substance

Work = force × a. work b. energy c. distance d. momentum

Determine the change in width a, height b, thickness t when a plate is subjected to the uniform distributed load and is made of material having modulus of elasticity e=230 gpa and poisson's ratio ν=1/3. given : a=400 mm and b= 300 mm also the uniformly distributed load in downward y direction of plate is 2 mn/m and in the positive x direction is 3 mn/m and t=20 mm