The specific surface energy for aluminum oxide is 0.90 N/m, and the elastic modulus is 393 GPa. Compute the critical stress, in MPa, required for propagation of a surface crack of length 0.25 mm. Round answer to 3 significant figures and report in the format: 12.3 MPa

Which branches of natural science include the study of an organism that lived 10 million years ago

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?

Atruck driver is attempting to deliver some furniture. first, he travels 8 km east, and then he turns around and travels 3 km west. finally, he turns again and travels 13 km to his destination. what is the drivers distance