# Homework Help: Acceleration of a car when given torque and mass

1. Jun 14, 2012

### lofty28

A car has a mass of 1200kg and delivers a total of 2300Nm of torque.
What is the acceleration of the car in m/s^2?
What is the speed of the car if it has accelerated for 11 seconds? (determained in first question),

I have looked at a few and still a bit stuck.
A=m*R
and then convert to m/s^2
or
W=(fcos theta)(d)

Attepted both and seem to still be getting the wrong answer..
A= 1200*0.306
= 367.2m/s^2

or
W=(2300cos45)(0.306*2)
= (1626.35)(0.612)
= 995.3262

As you can see i am well off the right answer. I am more incline to think it is the equation A=m*R...

2. Jun 15, 2012

### Ratch

lofty28,

How many newtons of force are applied to the auto when when 2300n-m of torque are applied to a tire of 0.306m radius?

Ratch

3. Jun 15, 2012

### lofty28

Newtons of force.... Would that be the mass...? soo 1200kg or 11767.98 N.
Is this what you mean?

4. Jun 15, 2012

### Ratch

lofty28,

In the MKS system, force is measured in newtons, mass is measured in kilograms.

Ratch

5. Jun 15, 2012

### lofty28

All the information given in the question is what i posted before...
Is there any way that i can figure this out with the given information..?

Thanks

6. Jun 15, 2012

### Ratch

lofty28,

Do you know what torque is?

Ratch

7. Jun 15, 2012

### lofty28

I have the understand torque is the mesument of power around a pivot point...
I am not entirly sure, this is proberbly why i am haveing trouble with the question..

8. Jun 16, 2012

### Ratch

lofty28,

You need to read a good physics book and find out what torque really is. Then the answer to my question in post #2 will become clear.

Ratch