November 27, 2015

Homework Help: physics

Posted by alexa on Monday, July 4, 2011 at 3:27pm.

I have a question based off of the response to the question I posted below.

A dragster and driver together have mass 918.8 kg. The dragster,starting from rest,attains a speed of 25.8 m/s in .53s .
Find the average acceleration of the dragsters during this time interval. Answer in units of m/s^2.

Assume the driver has a mass of 73.6kg. What horizontal force does the seat exert on the driver?

my question about henry's response is: IS THE HORIZONTAL FORCE ZERO OR 721.3N?

(this is henry's response:
a = 25.8 / 53 = 0.487m/s

F = 918.8*0.487 = 447.5N.

Fd = mg = 73.6kg * 9.8N/kg = 721.3N.
The angle between seat and hor = 0 deg.
Fh = 721.3sin(0) = 0 Newtons.

Fv = 721.3cos(0) = 721.3N = ver. force of driver.)

MY QUESTION IS:Is the horizontal force zero N? or is it 721.3N?

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