The best way to increase the calculated fatigue-crack propagation cycles to failure of a part is
(a) To select a material with a high KIc
(b) To ensure that the part has a very small initial crack length with nondestructive testing equipment.
(c) To polish the surface of the part
(d) To case-harden the part
(b) To ensure that the part has a very small initial crack length with nondestructive testing equipment.
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A neutron star must have a mass greater than 2.4 solar masses
a. True b. False Indicate whether the statement is true or false
The top panorama shows our view of the Milky Way in all directions as it appears in visible light. The bottom panorama shows the same view, but in a different wavelength of light. What wavelength band are we seeing in the bottom photo, and how do you know?
A) infrared light, because the dust that appears dark in the visible light photo glows in infrared light B) x-ray light, because only x-rays allow us to see through the disk of our galaxy C) radio waves, because clouds of gas in the disk of our galaxy appear pinkish when we look at them with radio telescopes D) infrared light, because clouds of gas and dust appear pinkish when we look at them with infrared telescopes
If a nonzero torque is applied to an object, that object will experience:
a. a constant angular speed. c. a constant moment of inertia. b. an angular acceleration. d. an increasing moment of inertia.
An airplane flies between two points on the ground that are 500 km apart. The destination is directly north of the origination of the flight
The plane flies with an air speed of 120 m/s. If a constant wind blows at 10.0 m/s due west during the flight, what direction must the plane fly relative to north to arrive at the destination? A) 4.78° east of north B) 4.76° east of north C) 85.2° west of north D) 4.78° west of north E) 4.76° west of north