You discover a Cepheid variable star with a 30 day period in the Milky Way. Through careful monitoring for a few years with the Hubble Space Telescope, you determine that it has a parallax of 0.004 arcseconds. How distant is this Cepheid variable star in parsecs?

This problem has been solved! see the answera non-uniform fire escape ladder is 6.0m long whenextended to the icy alley below. it is held at the top by africtionless pivot, and there is neglibible frictional force fromthe icy surface at the bottom. the ladder weighs 250n, and it'scenter of gravity is 2.0m along the ladder from the bottom. amother and child of total weight 750n are on the ladder 1.5m fromthe pivot. the ladder makes an angle θ with the horizontal.find the magnitude and direction ofa) the force exerted by the icy alley on the ladderb) the force exerted by the ladder on the pivotc) do your answers in part a and b depend on the angle?

What are the three ways that an object can accelerate

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?