A plane element in a body is subjected to a tensile stress of 100 MPa accompanied by a shear stress of 25 MPa.
Find
(i) the normal and shear stress on a plane inclined at an angle of 20° with the tensile stress
(ii) the maximum shear stress on the plane.

Afeather of mass 0.001 kg falls from a height of 2 m. under realistic conditions, it experiences air resistance. based on what you know about friction, what can you say about the kinetic energy of the feather as it reaches the ground? acceleration due to gravity is g = 9.8 m/s2. a. ke < 0.0196 j b. ke = 00196 j c. je = 0 j d. ke > 0.0196 j

Hydrogen atoms are excited by a laser to the =4n=4 state and then allowed to emit. what is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system? 8 6 2 7 4 5 1 3 calculate the wavelength of the 4⟶14⟶1 transition. =λ=

Smallest intensity of a stimulus that you can detect 50 percent of the time is