The dimensional equivalence of the quantity "momentum" in terms of the fundamental quantities (mass, length, time) is:
a. MLT-1.
c. MLT.
b. ML2T-2.
d. MLT-2.
A
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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.
As shown in the diagram, you've just thrown a baseball toward Al at 100 km/hr, while he is moving away from you to the right at 90 km/hr. According to Al, what is the baseball doing?
A) traveling to the right at 10 km/hr B) traveling to the right at 100 km/hr C) staying stationary D) traveling to the right at 190 km/hr
The radius of the Sun is 6.95 × 108 m. It radiates heat at the rate of 5.42 × 1026 W. Assuming that it is a perfect emitter, what is the temperature of the surface of the Sun? The Stefan-Boltzmann constant is 5.67 × 10-8 W/(m2?K4)
A) 6.30 × 103 K B) 8.25 × 103 K C) 8.87 × 103 K D) 3.93 × 107 K E) 5.78 × 107 K
If a 0.20 pF capacitor has a voltage of 40 mV, how many more electrons are on the negative plate than on the positive plate?
a. 
b. 
c. 
d. 
e. none, the electrons are in equal numbers on the plates