Kapiteltest kapitel 2 ”Jämvikt och Kraftmoment” Hjälpmedel: Skrivtid:
Miniräknare, eget formelblad 40 min
Namn:
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1
Beskriv begreppet momentarm.
(1 p)
2
En bult skall dras åt med momentet 250 Nm. Hur stor kraft erfordras om hävarmen är 0,30 m?
(2 p)
En lätt stång vilar på ett stöd. I stångens ändar hänger vikter med massorna 12 kg respektive 2,3 kg. Bestäm avståndet x i figuren.
(2 p)
3
4
En större sten skall avlägsnas med hjälp av ett spett. Spettet, som har längden 1,6 m, är i kontakt med marken i punkten P. Sträckan AP i figuren är 125 cm. Man trycker vinkelrätt mot spettet med kraften F = 0,55 kN. Med vilken kraft kommer spettets nedre ände att trycka mot stenen?
(2 p)
5
Anders Svensson drar i en 65 cm lång stång med en kraft F = 110 N enligt figur. Bestäm kraftmomentet med avseende på punkten O.
(2 p)
6
Astronauterna George och Sandra har efter en misslyckad rymdpromenad hamnat ute i fria rymden, långt bort från rymdfarkost, himlakroppar och allt annat vars tyngdkrafter de annars skulle kunna tänkas påverkas av. De har hamnat 25 m från varandra. Pga gravitationskrafterna från varandra börjar de sakta, sakta rotera kring deras gemensamma masscentrum. Hur långt bort från Sandra ligger detta masscentrum? Georges massa är 145 kg och Sandras är 120 kg (inklusive rymddräkter). (2 p)
7
Sveriges…kanske världens…bästa fotbollslag, Elfsborg, har inför kommande säsong värvat en mittfältare från Östersund. Vad heter han? (Ringa in ditt svar) 1. Petter Clooney X. Alex Dyer 2. George Northug George?
The number, timing and direction of earliest extra-African dispersal events in human evolution has long been unclear and contentious (ROLLAND 1998, TURNER 1999a), although substantiated dates for hominin appearance in Eurasia set a minimally early da
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On Monday mornings we will sing the National Anthem and do birthday announcements and pencils and. for the following days the students will be asked to ...
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