A 1 m long rod for an aircraft must carry an axial load of 5×106 N, and the rod design mass is 54 kg. The rod is to be made from a high strength aluminum alloy that has a density of 2.7×103 kg/m3 , and the yield stress must be equal to twice the applied stress in the metal
(a) What is the minimum yield stress for the aluminum alloy?
(b) The elastic modulus for aluminum alloys is 70×109 Pa, what is the elongation of the rod?
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A) the changes in the wavelengths of radiation. B) the process behind quantum jumps. C) how the Coulomb force helps in binding electrons to an atom. D) the reversal of the Sun's magnetic field from cycle to cycle.
Describe interstellar reddening
What will be an ideal response?
In a single-slit diffraction experiment, a beam of monochromatic light of wavelength 630 nm is incident on a slit of width 0.400 mm. If the distance between the slit and the screen is 1.80 m, what are the positions of the first dark fringes?
A) 0.440 × 10-3 m B) 0.870 × 10-3 m C) 1.30 × 10-3 m D) 1.65 × 10-3 m E) 2.84 × 10-3 m
Consider the following situations:
· a car slowing down at a stop sign · a ball being swung in a circle at constant speed · a vibrating string · the Moon orbiting the Earth · a skydiver falling at terminal speed · an astronaut in an orbiting space station · a ball rolling down a hill · a person driving down a straight section of highway at constant speed with her foot on the accelerator · a molecule in the floor of this room In how many of the situations is the object accelerating?
1.One of the situations. 2.Two of the situations. 3.Three of the situations. 4.Four of the situations. 5.Five of the situations. 6.Six of the situations. 7.Seven of the situations. 8.Eight of the situations. 9.Nine of the situations. 10.None of the situations.