A newly discovered bright star has a luminosity of 78.4×1026 W. What is its temperature if it has a radius of ~1.2x106 km?

4. Show that the acceleration of any object down an incline where friction behaves simply (that is, where F* = Hk FN) is a = g(sin 0 – Hk Cos 0). Note that the acceleration is independent of mass and reduces to a = g sin ở when friction becomes negligibly small (4k = 0).

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What is the minimum horizontal force F needed to make the box start moving in (Figure 1)? The coefficients of kinetic and static friction between the box and the floor are 0.23 and 0.41, respectively. Express your answer in newtons to two significant figures. 15| ΑΣΦ wwwww ? N

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