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                Forces 5
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            What happens if I put a pendulum on a trolley?
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            <h4>While the teacher wasn&#39;t looking a student put a pendulum on the trolley of a Newtons second law experiment. The trolley and pendulum accelerated across the table and the pendulum hung at an angle of 30&deg;. If the mass of the trolley plus pendulum was 1 kg what&nbsp; mass was hung on the string?</h4>

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            <button data-out="a" class="btn btn-default btn-nav">Ok</button> <button data-out="b" class="btn btn-default btn-nav">Don't we need to know the mass of the pendulum bob?</button> <button data-out="c" class="btn btn-default btn-nav">Why does the pendulum hang at an angle?</button> 
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