Homework Help: Physics B

Posted by Mary on Sunday, November 4, 2012 at 12:20pm.

part 1
A coordinate system (in meters) is constructed on the surface of a pool table, and
three objects are placed on the coordinate system as follows: a 1.5 kg object at the origin,
a 3.4 kg object at (0 m,1.8 m), and a 4.5 kg
object at (4.2 m,0 m).
THANK YOU!!
Find the resultant gravitational force exerted on the object at the origin by the other
two objects. The universal gravitational constant is 6.672 × 10
−11
N · m2
/kg
2
.
Answer in units of N

Part 2
At what angle does it act with respect to
the positive x axis? Let counterclockwise be
positive, within the limits of −180
◦
to 180
◦
.
Answer in units of
◦

Physics B - Elena, Sunday, November 4, 2012 at 5:17pm
F =G•m1•m2/R²
the gravitational constant G =6.67•10^-11 N•m²/kg²,

F1= G•1.5•3.4/1.8²
F1= G•1.5•4.5/4.2²

F=sqrt(F1²+F2²)
α=arctan(F2/F1)

The angle with respect to the positive x axis is
180°+ α

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