What is the mean free path of a gas of randomly-moving hard spheres of radius 2.00 × 10-9 m when the density of spheres is 3.00 × 1019 per cubic meter?
A) 1.17 × 10-4 m
B) 4.00 × 10-9 m
C) 9.76 × 10-5 m
D) 1.88 × 10-3 m
E) 4.69 × 10-4 m
Answer: E
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A composite material is made from a 7075-T6 aluminum matrix with 50 % uniaxial alumina fibers. The yield strength of the aluminum is 500 MPa, and the elastic modulus is 70 GPa. The tensile strength of the alumina fibers is 1.4 GPa, and the elastic modulus is 380 GPa.
(a) Calculate the strain where the first change in elastic modulus occurs for this composite material in an axial tensile test. (b) Calculate the composite stress where the change in elastic modulus occurs.
A baseball has a mass of 0.15 kg. If pitched at 40.0 m/s with a relative uncertainty of 1%, how uncertain is its position?
A. 9.1 x 10-34m B. 5.7 x 10-34m C. 1.8 x 10-34m D. 6.3 x 10-33m
The beam in a cathode-ray tube is composed of
A) photons. B) electrons. C) both of these D) neither of these
Force is a vector quantity
Indicate whether the statement is true or false