The half life of uranium-232 is 70 years. The time for 3/4 of a sample of uranium-232 to decay is 105 years
Indicate whether the statement is true or false
F
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A rectangular plate in plane stress is subjected to normal stresses ?x 5 35 MPa, ?y 5 26 MPa, and shear stress ?xy 5 14 MPa. The ratio of the magnitudes of the principal stresses (?1/?2) is approximately:
(A) 0.8
(B) 1.5
(C) 2.1
(D) 2.9
What is the wavelength of a monochromatic light beam, where the photon energy is 2.15 eV? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, 1 nm = 10?9 m, and 1 eV = 1.6 × 10^?19 J)
a. 308 nm b. 578 nm c. 223 nm d. 156 nm e. 475 nm
Earth's rotation axis is approaching Polaris today
a. True b. False Indicate whether the statement is true or false
Planetary geologists now refer to the exterior of the newborn moon as__________
A) a multiringed basin B) a micrometeorite C) a magma ocean D) coronae