How would you best describe texture of an igneous that formed extremely slow underground? a. pegmatic b. fine grained c. metallic d. glassy

What was the first instrument to ever record an earthquake?

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

Wo small variable-thrust jets are actuated to keep the spacecraft angular velocity about the z-axis constant at ? 0 = 1.16 rad/s as the two telescoping booms are extended from r1 = 1.18 m to r2 = 4.69 m at a constant rate over a period of 124 seconds. the small 19-kg experiment modules at the ends of the booms may be treated as particles, and the mass of the rigid booms is negligible. determine the necessary thrust t for each jet as a function of time where t = 0 is the time when the telescoping action is begun. after you have the general expression for t, answer the questions. show work.