Hi, i'm new here. I have a problem.(adsbygoogle = window.adsbygoogle || []).push({});

1. The problem statement, all variables and given/known data

A box has the mass m, held by two horizontal ropes and two vertical ropes. The box is inside a still car. If the car accelerated suddenly with the accekeration of a then the box will remain still inside the car. What is :

a. The acceleration of the box/car? (state it in t1, t2, t3, t4 and g)

b. The separation after the time t? (state it in t1, t2, t3, t4, t and g)

The illustration is here -> xttp://i31.tinypic.com/izvnev.jpg (change x to h)

2. Relevant equations

[tex]\Sigma F = ma[/tex]

3. The attempt at a solution

a.

t3 + t1 = ma

m = (t3 + t1)/a (1)

t4 + t2 = mg

m = (t4 + t2)/g (2)

(t3 + t1)/a = (t4 + t2)/g

a = g(t3 + t1)/ t4 + t2 (3)

b.

S = Vt

S = a * t * t

S = (g(t3 + t1)/ t4 + t2) * t^2

S = g (t^2) ((t3 + t1)/(t4 + t2))

I actually don't really know how the tensions work. I hope someone can explain it to me. And sorry, i'm not used to using latex yet.

**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: Box in a Car

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