A block of gelatin is 120mm by 120mm by 40mm when unstressed. A force of 49N is applies tangentically to the upper surface causing a 10mm displacement relative to the lower surface. the block is placed such that 120 × 120 comes out of both the lower and upper surface. Find the shearing stress, shearing strain and shear modulus.​

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.