The astronomical unit (AU) is defined to be equal to the
A) average distance between the Earth and Sun
B) average distance between the Sun and the planet Pluto
C) distance between the Sun and the nearest star
D) diameter of the Earth
A
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What conclusion can be drawn from the fact that some planets and satellites with solid surfaces have impact craters?
A. The Sun went through several explosions, ejecting material that scarred the planets and satellites. B. The young planets had softer surfaces. C. Collisions between Solar System bodies and planetesimals were common at one time. D. Volcanoes were very active in the early stages of planet formation.
Assume that the fatigue striations just before final fracture on the part in Example Problem 11.7 had increased to 1×10-5 meters per cycle when the internal crack length had grown to 2a = 0.03 m. Assume that the data in Figure 11.27 is for a minimum stress of 0.
(a) Determine the stress intensity range that created these striations, and compare the value of Kmax to the value of KIc. (b) Predict the stress range applied to this part just before failure. (c) Did the part fail by fatigue fracture due to propagation of a crack to a critical size, or by an overload exceeding the ultimate tensile strength?
A small glass bead has been charged to 1.9 nC. What is the strength of the electric field 2.0 cm from the center of the bead? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) 4.3 × 104 N/C B) 8.5 × 102 N/C C) 8.1 × 10-5 N/C D) 8.5 × 10-7 N/C
On an average diet, the consumption of 10.6 liters of oxygen releases how much energy? (4.50 kcal are released per liter of oxygen consumed.)
a. 45 kJ b. 199 kJ c. 44.3 kJ d. 4 430 kJ e. 399 kJ