During a reaction, 1.7 × 10-4 J of energy is released. What change of mass would cause this?
A) 5.1 × 10-4 kg
B) 4.3 × 10-11 kg
C) 1.5 × 10-13 kg
D) 4.8 × 10-18 kg
E) 1.9 × 10-21 kg
E
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A part for a land-based gas-turbine made of Haynes 25 must carry a tensile stress of 140 MPa (20 ksi). For a design lifetime of 10 years, what is the allowable temperature for this part, based only upon high-temperature creep rupture?
What will be an ideal response?
Thin Lenses: Which of following statements about the image formed by a single converging lens are true? (There could be more than one correct choice.)
A. The image is always real. B. The image is always virtual. C. The image is always inverted. D. The image is always upright. E. None of these choices are correct.
In general, the narrower the spectral line of a star:
A) the hotter the star is. B) the bigger the star is. C) the denser the star is. D) the smaller the star is. E) the cooler the star is.
Two electrons are separated by one cm. What is the ratio of the electric force to the gravitational force between them? (me = 9.11 × 10^-31 kg, ke = 8.99 × 10^9 N×m2/C2, G = 6.67 × 10^-11 N×m2/kg2, and e = 1.6 × 10^-19 C)
a. 1.3 × 10^20 c. 2.3 × 10^2 b. 4.2 × 10^42 d. 3.1 × 10^22