Posted by **Jinx007** on Sunday, June 13, 2010 at 9:29am.

Dynamics question please help i am stuck...!

A model helicopter of mass 5.0 kg rises with constant acceleration from rest to a height of 60 m in 10 seconds. Find the thrust exerted by the rotor blades during the ascent

- physics -
**MathMate**, Sunday, June 13, 2010 at 10:28am
Thrust required to keep the helicopter stationary

= weight of helicopter

= mg

To find the vertical (upwards) acceleration, we use the formula:

S=ut+(1/2)at²

where

S = distance = 60m

u = initial velocity = 0

t = time = 10 s

a=2(S-ut)/t²

=2(60-0)/10²

=1.2 m s^{-2}

Total thrust

= 5 kg ( 9.8 + 1.2 ) m s^{-2}

= 55 N

- physics -
**Alan Zamora**, Sunday, June 13, 2010 at 11:49am
get a square root of spooky SAS 2 divided by the matrix of two plus two minus X multiply the eigen value of .23 electron volts equals macanca.

## Answer this Question

## Related Questions

- Physics - A model helicopter of mass 5kg rises vertically from rest to a height ...
- Physics - A model helicopter and its load have a combined mass of 3.5 kg. Find ...
- Physics - A helicopter of mass M and weight ,W,rises with vertical acceleration...
- Physics THRUST - To begin I just need to know how to do thrust. A lunar lander ...
- physics - A helicopter, starting from rest, accelerates straight up from the ...
- Physics - A helicopter, starting from rest, accelerates straight up from the ...
- Physics - A helicopter descends from a height of 600 m with uniform negative ...
- physics - On a day with a breeze blowing from the west at 8.5km/h, a remote ...
- physics - Model rocket engines are sized by thrust, thrust duration, and total ...
- Physics - A model rocket rises with constant acceleration to a height of 3.1 m, ...

More Related Questions