What is a diffraction grating?
A diffraction grating consists of many very fine, closely spaced parallel slits. The
number of slits varies from a few hundred per inch to several thousand per
centimeter.
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A beam with an overhang is loaded by a uniform load of 3 kN/m over its entire length. Moment of inertia Iz 5 3.36 3 106 mm4 and distances to top and bottom of the beam cross section are 20 mm and 66.4 mm, respectively. It is known that reactions at A and B are 4.5 kN and 13.5 kN, respectively. The maximum bending stress in the beam is approximately:
(A) 36 MPa
(B) 67 MPa
(C) 102 MPa
(D) 119 MPa
How are stars being formed in the Eagle Nebula?
A.) The whole Nebula is unstable to collapse. B.) The dust column is twisting and fragmenting into stars. C.) Shock waves from heated gas are crashing into colder gas and compressing it, allowing stars to form. D.) A passing pulsar is compressing portions of the nebula with its jets. E.) No stars are forming. All the brights stars seen are actually outside the Nebula.
An airplane propeller pushes against the air, and the air, by Newton’s 3rd law, pushes against the propeller. How does a rocket work in outer space where there is no atmosphere?
A. There is enough atmosphere, even in outer space, for the same principle to work. B. A rocket exerts a force on its exhaust gases and the gases exert a force on the rocket. C. Rockets use nuclear power and don’t need an atmosphere to work.
An atom can only have orbits of certain sizes, called _______________ orbits
Fill in the blank(s) with correct word