In the figure shown below (from lab # 29), rk= 1000 w, jb = 45 cm, and bk = 55 cm. what is the approximate value of ru ?

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?

The largest observatory complex in the world is on mauna kea, the tallest mountain on earth. what are some factors astronomers consider when selecting an observatory site? don’t forget practical ones. should astronomers, for example, consider building an observatory on denali (mount mckinley) or mount everest?

Whithin which type of system is neither the total mass nor the total energy conserved ? a. open b. connected c. isolated d. closed