A box weighs 2000N and is accelerated uniformly over a horizontal surface at a rate of 8 m/s^2. The opposing force of friction b
1 answer:
Answer:
3633 N
Explanation:
When the box is lift upward, there are only two forces acting on it:
- The force of push, F, upward
- The force of gravity, downward, which is the weight of the object:
W = 2000 N
So, the equation of motion for the box is
where
m is the mass of the object
a is its acceleration
The mass can be found from the weight of the box:
Where g = 9.8 m/s^2 is the acceleration of gravity, and the acceleration is
So, we can solve for F, the force required:
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Answer:
F_A = 8 F_B
Explanation:
The force exerted by the planet on each moon is given by the law of universal gravitation
F =
where M is the mass of the planet, m the mass of the moon and r the distance between its centers
let's apply this equation to our case
Moon A
the distance between the planet and the moon A is r and the mass of the moon is 2m
F_A = G \frac{2m M}{r^{2} }
Moon B
F_B = G \frac{m M}{(2r)^{2} }
F_B = G \frac{m M}{4 r^{2} }
the relationship between these forces is
F_B / F_A = = 1/8
F_A = 8 F_B