Type I supernovae result from white dwarf stars that have reached a mass of ________ solar masses from material transferred by a giant companion
Fill in the blank(s) with correct word
1.4
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A steel bar of rectangular cross section (a 5 38 mm, b 5 50 mm) carries a tensile load P. The allowable stresses in tension and shear are 100 MPa and 48 MPa, respectively. The maximum permissible load Pmax is approximately:
(A) 56 kN
(B) 62 kN
(C) 74 kN
(D) 91 kN
Which of the following greatly improves the angular resolution of radio maps?
A) Schmidt corrector plates B) more sensitive spectrometers C) switching from film to CCD imaging D) use of interferometers E) chilling the infrared detectors
How wide must a narrow slit be if the first diffraction minimum occurs at ±12° with laser light of 633 nm?
a. 3.0 × 10^?6 m b. 3.0 × 10^?5 m c. 6.1 × 10^?6 m d. 6 .1× 10?5 m e. 1.5 × 10^?6 m
How many calories are equal to one BTU? (One calorie = 4.186 J, one BTU = 1054 J.)
a. 0.252 c. 252 b. 3.97 d. 397