30. A truck of mass 2250 kg is used to pull a 330 kg trunk out of an old quarry as shown below. There is 550 N of rolling resistance for the truck. Ignore mass and friction of the pulley. (a) If the trunk is accelerated upward at 2.00 m/s2 what is the minimum amount of horizontal force the truck’s drive wheels exert on the ground? (b) For the same conditions what is the tension in the towrope?

Question

30.  A truck of mass 2250 kg is used to pull a 330 kg trunk out of an old quarry as shown below.  There is 550 N of rolling resistance for the truck.  Ignore mass and friction of the pulley.  (a) If the trunk is accelerated upward at 2.00 m/s2 what is the minimum amount of horizontal force the truck’s drive wheels exert on the ground?  (b) For the same conditions what is the tension in the towrope?

Elena · Accepted Answer

m1=2250 kg, m2 =330 kg, R=550 N, a= 2 m/s² m1•a=F-R-T m2•a =T- m2•g a(m1+m2)=F-R-T+T-m2•g F= a(m1+m2) +m2•g+R=... T=m2(a+g)=…