Opgave_121.pdf

# Opgave_121.pdf - Opgave 121 m H L m En person holder et lod...

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Opgave 121 H L m m En person holder et lod med massen m = 0.250 kg i hvile. Loddet hænger i en snor med længden L = 1.25 m, og rører ikke jordoverfladen. Der etableres nu en rotation uden at loddet på noget tidspunkt kommer i kontakt med jordoverfladen. Kuglen udfører herefter en jævn cirkelbevægelse i vandret plan. Snorens vinkel med lodret kaldes for θ , og den har værdien 80 o . Ved etableringen af den jævne cirkelbevægelse hæves loddet stykket H = 1.90 m. a) Beregn snorkraftens størrelse samt farten af loddet i den omtalte, jævne cirkelbevægelse. b) Beregn størrelsen af det arbejde, som snorkraften har udført på loddet i forbindelse med etableringen af den jævne cirkelbevægelse.
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