15. An insect lands on a compact disc that is put
1 answer:
Answer:
Yes, it is accelerating
Explanation:
Acceleration is a vector quantity, which means it has both a magnitude and a direction.
Acceleration is defined as the rate of change of velocity:
where v is the velocity and t is the time.
v, the velocity, is also a vector, having both a magnitude (called speed) and a direction. This means that the acceleration is non-zero whenever the velocity is changing: this means that we have an acceleration either when the speed is changing, or also when the direction of the velocity is changing.
In the example in the question, the insect spins with the disc, so it is in circular motion. This means that the direction of the velocity of the insect is constantly changing: therefore, the acceleration of the insect is non-zero, so the insect is accelerating.
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Answer:
The correct answer to the question is
B. It always decreases
Explanation:
To solve the question, we note that the foce of gravity is given by
where
G= Gravitational constant
m₁ = mass of first object
m₂ = mass of second object
r = the distance between both objects
If the mass of one object remains unchanged while the distance to the second object and the second object’s mass are both doubled, we have
=
Therefore the gravitational force is halved. That is it will always decrease