(adsbygoogle = window.adsbygoogle || []).push({}); Mechanics Question. IV :)

A breakdown van ofmass 2000 kgis towing a car ofmass 1200 kgalong a straight horizontal road. The two vehicles are joined by a tow bar which remains parallel to the road. The van and the car experience constant resistances to motion of magnitudes800 N and 240 Nrespectively. There is a constant driving force acting on the van of2320 N. Find

(a) the magnitude of the acceleration of the van and the car,

(b) the tension in the tow bar.

The two vehicles come to a hill inclined at an angle α to the horizontal, wheresin αlpha= 1/20. The driving force and the resistances to the motion are unchanged.

(c) Find the magnitude of the acceleration of the van and the car as they move up the hill and state whether their speed increases or decreases.

---

Hey...

I get the first 2 questions... with the answers of 0.4m/s and 720.

however (c) .. i dont really get... i would think of using the sin 1/20 in my answer [along with F=ma where m is 3200 (sum of the two cars' masses) ]... but the model answer contradicts this... they dont use sin or cos...

could someone please help me out on this one... :)

Thanks a lot.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Mechanics Question. IV

**Physics Forums | Science Articles, Homework Help, Discussion**