Posted by devon on Sunday, October 3, 2010 at 5:16pm.
A small weather rocket weighs 15.5 N. The rocket is carried up by the balloon. The rocket is released from the balloon and fired, but its engine exerts an upward force of 11.0 N. What is the acceleration of the rocket?
physics - bobpursley, Sunday, October 3, 2010 at 5:36pm
Hmmmm. So the upward force is less than the pull of gravity, meaning a is downward.
11=15.5/9,8 a + 15.5
a= 4.5*g/15.5 downward.
physics - Rose, Sunday, October 3, 2010 at 5:44pm
Yes if the upward force is less than gravitythen the acceleration would be downward, but it wouldn't be negative as it's not a deacceleration. :)
physics - Rose, Sunday, October 3, 2010 at 5:49pm
a = F / m
Effective F = upward force - downward force (weight)
= 11- 15.5
= 4.5 downward
a = 4.5/ (15.5/9.8)
= 2.8 m/s downwards.
(I'm pretty sure anyway)
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