Question

3. A body of mass 5 kg rests on a smooth plane inclined at an angle of 30° to the horizontal. A string attached to the body runs parallel to the plane and is fixed to a point A. Find the tension in the string and the normal reaction of the plane on the body. 30 4. In the same situation as in Q3 above, the point A to which the string is attached is now moved up the wall such that the angle the string makes with the horizontal is 60°. (So, it makes an angle of 30 with the plane). Find the tension in the string and the normal reaction in this new configuration.

3&4 please. Thanks

Answer 1

Let T be the tension in fthe staiy and R be hoi eaction af the phane on the bodj in the fiune, its f the body actij vartay ickw, ZBDC=30(jven,L DcO=96/£D¢- 6 as showh Remsviy the Arcn y nd berferdhcur to incAned phane, wejc TosotRlas+5a(6t6o) TDRO)+5ab) T-5nozo T-5 a= 5 (12)= TSini Ringi+5 Sin (it6) = 4 TOHR)+5Sin be)= 5

J thin are aU forces renains except direcfon oftension Tuake, a ahjle 30 ith the plane. TA esstviy te ras aay a perhendia Jar Yo the incined planegett ao+5 a(86)= R()+5ob-) = T 5 as65 T-5/ TOs ard TSin 3o +Rsin9 +5Sin (8o+b*)= RO)+5sin) T- 5-515-E= 10 RE5SinboE