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2 answers:
Answer:
c. Yes, because electric charges have electric fields surrounding them that allow them to exert forces on other objects without touching them.
Explanation:
As we know by Coulomb's law the force of attraction or force of repulsion between two charged bodies is given by
now we know that
if two charges are of same sign then they will repel each other and if the two charges are of opposite sign then they must attract each other.
So here since two balloons are of negative charge so we can say that electric field on one balloon will repel the charge of other balloon.
So here both balloons will repel each other and correct answer will be
c. Yes, because electric charges have electric fields surrounding them that allow them to exert forces on other objects without touching them.
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Answer:
35.6 N
Explanation:
We can consider only the forces acting along the horizontal direction to solve the problem.
There are two forces acting along the horizontal direction:
- The horizontal component of the pushing force, which is given by
with
- The frictional force, whose magnitude is
where , m=8.2 kg and g=9.8 m/s^2.
The two forces have opposite directions (because the frictional force is always opposite to the motion), and their resultant must be zero, because the suitcase is moving with constant velocity (which means acceleration equals zero, so according to Newton's second law: F=ma, the net force is zero). So we can write: