When we say that electrically charged particles in the atmosphere cause lightning, we mean 'cause' in the sense of a: Group of answer choices Necessary but not a sufficient condition. Necessary and a sufficient condition. Relative and an absolute condition. Relative but not an absolute condition. Sufficient but not a necessary condition.

Amira pulls a 3 pound wagon 4 feet. how much work has she done?

Complete the sentence to describe the law of conservation of energy. the law of conservation of energy states that energy cannot be created

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.