3 Mechanics
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233
Question 233
In this question use g=9.8g = 9.8g=9.8 m s−2^{-2}−2.
A uniform beam AB AB\,AB of length 4 m and mass 20 kg rests horizontally in equilibrium on two supports at C C\,C and DDD, where AC=0.8AC = 0.8AC=0.8 m and AD=3.2AD = 3.2AD=3.2 m.
A child of mass 30 kg stands on the beam at DDD.
Find the magnitude of the reaction of the support on the beam at C C\,C and the magnitude of the reaction of the support on the beam at DDD.