A girl throws a stone straight down from a bridge. The stone leaves her hand with speed of 8.00 m/s at a height of 12 m above the water below. How much time does it take for the stone to hit the water?
A) 2.58 s
B) 0.95 s
C) 1.8 s
D) 0.41 s
E) 17.3 s
B
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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?
According to our theory of solar system formation, where did the comets of the Oort cloud form?
A) in the inner solar system B) far beyond the orbit of Pluto C) in the region of the jovian planets D) in the asteroid belt
Dark matter is detectable in the coronae of ____
a. elliptical galaxies only b. spiral galaxies only c. irregular galaxies only d. spiral and elliptical galaxies only e. all galaxies
Consider a star with 2 identical planets, both with nearly circular orbits, except the orbit of Planet A is closer to the star than the orbit of Planet B. Which of the following statements is true?
A) Planet A is moving slower than Planet B. B) Planet A moves with the same speed as Planet B. C) Planet A is moving faster than Planet B.