Suppose two worlds, each having mass M and radius R, coalesce into a single world. Due to gravitational contraction, the combined world has a radius of only 3/4 R. What is the average density of the combined world as a multiple of ρ0, the average density of the original two worlds?
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A film of Jesse Owens’s famous long jump (Fig. 6–47) in the 1936 Olympics shows that his center of mass rose 1.1 m from launch point to the top of the arc. What minimum speed did he need at launch if he was traveling at 6.5 m/s at the top of the arc?
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The figure here shows three arrangements of an electron e and two protons p. (a) Rank the arrangements according to the magnitude of the net electrostatic force on the electron due to the protons,largest first. (b) In situation c, is the angle between the net force on the electron and the line labeled d less than or more than 45°?
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A car slows down from 28 m/s to rest in a distance of 88 m. What was its acceleration, assumed constant?
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What must be the distance between point charge q1 = 26.0 μC and point charge q2 = -47.0 μC for the electrostatic force between them to have a magnitude of 5.70 N?
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To what temperature will 8200 J of heat raise 3.0 kg of water that is initially at 10.0°C?
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Calculate the hydrostatic difference in blood pressure between the brain and the foot in a person of height 1.83 m. The density of blood is 1.06 x 10^3 kg/m^3.
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Figure 22-25 shows four situations in which four charged particles are evenly spaced to the left and right of a central point. The charge values are indicated. Rank the situations according to the magnitude of the net electric field at the central point, greatest first.
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In the return stroke of a typical lightning bolt, a current of 2.5 x 10^4 A exists for 20 μs. How much charge is transferred in this event?
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When a person jumps from a tree to the ground, what happens
to the momentum of the person upon striking the ground?
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