For each of the following statements determine whether it is correct or incorrect.
1 answer:
Answer:
a) T; b) F; c) F; d) T; e) T; f) T
Explanation:
a) True, since the equation of work done on a spring is
b) False, it will be only mgh.
c) False, since it is , no direction involved.
d) True, since the measured speed of objects depends from the reference frame of the observer.
e) True, since its formula is and both terms are positive.
f) True, since the centripetal force the Earth feels, which is the gravitational atraction the Sun exerts, is perpendicular to its circular trajectory.
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If the distance between two charges is halved, the electrical force between them increases by a factor 4.
In fact, the magnitude of the electric force between two charges is given by:
where
k is the Coulomb's constant
q1 and q2 are the two charges
r is the separation between the two charges
We see that the magnitude of the force F is inversely proportional to the square of the distance r. Therefore, if the radius is halved:
the magnitude of the force changes as follows:
so, the force increases by a factor 4.
In fact, the magnitude of the electric force between two charges is given by:
where
k is the Coulomb's constant
q1 and q2 are the two charges
r is the separation between the two charges
We see that the magnitude of the force F is inversely proportional to the square of the distance r. Therefore, if the radius is halved:
the magnitude of the force changes as follows:
so, the force increases by a factor 4.