Atmospheric pressure is 1.00 × 10^5 N/m2, and the density of air is 1.29 kg/m3 . If the density of air is constant as you get higher and higher, calculate the height of the atmosphere needed to produce this pressure
a. 1 260 m
b. 77 000 m
c. 7 900 m
d. 10 300 m
c
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A large critical part is made of steel for which KIc=60 MPa·m1/2 determined in air at room temperature. Nondestructive inspection has found no cracks in the part.
The minimum detectable crack length for the nondestructive inspection equipment is 2a=0.20×10-3 m. The part is to be subject to a stress range of ??=300 MPa about a mean stress of 150 MPa. Laboratory tests in air at room temperature show that the crack growth rate in this material follows the relationship da/dN=1×10-13 ?K6 in units of MPa and meters. (a) Predict the crack length at fracture, assuming an internal crack with Y=1. (b) Calculate the lifetime of this part based upon fatigue-crack propagation in air at room temperature.
The dark spots in this photo (such as the one indicated by the arrow) represent what we call
A) sunspots. B) convection zones. C) coronal holes. D) solar prominences. E) Great Dark Spots.
Resonance occurs when
a. two different objects vibrate with different frequencies. b. two different objects produce beats. c. an object having a certain natural frequency is set in vibration by a second object vibrating at that frequency. d. an object produces a sound.
A model rocket of mass, m, is fired upward from a launch pad with some initial speed, v. A gravitational force is exerted on the rocket
1.at all points in its motion except at it highest point. 2.at all points in its motion. 3.at no points in its motion. 4.at none of these choices.