In a billiards game, the cue ball of mass m travelling with velocity 2.8 m/s in the positive x-direction hits the stationary 9-ball also of mass m. after the collision, the 9-ball moves off at an angle of 30 degrees above the positive x-axis while the cue-ball moves off at an angle of 60 degrees below the positive x-axis. what speed does the cue ball have after the collision? a) 2.8 m/sb) 1.4 m/sc) 0.4 m/sd) 2.4 m/se) 0.7 m/s
round the corners of the magnet that where it is stronger
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the first practical realisation of the metric system came in 1799, during the french revolution, when the existing system of measures, which had become impractical for trade, was replaced by a decimal system based on the kilogram and the metre.
based on the description, the experiment is designed to confirm or reject a hypothesis about a heat absorption patterns by hollow objects with different transparency. temperature appears to be the main target variable of interest - this is the dependent variable. material that each box is made of (specifically, its transparency) is in this case the independent variable, which is determined by the experimenter.