Answer:
it is the instantaneous speed of the bike rider.
Explanation:
First of all, let's remind the difference between speed and velocity:
- speed is a scalar, and it is the ratio between the distance covered and the time taken:
- velocity is a vector, which consists of a magnitude (the speed) and a direction as well.
The term 'instantaneous' means that the speed (or velocity) is measured at one precise instant of time, while the term 'average' means it is measured over a longer time period.
Based on all these definitions above, we can conclude that the correct answer is
it is the instantaneous speed of the bike rider.
Because in this problem, only the speed is given (no direction), so this is not a velocity, and also it is measured at one precise instant of time, so it is an instantaneous speed.
Answer:
The woman's average velocity during the trip is 36.2 miles/hour.
Explanation:
Velocity can be define as the displacement of an object per time. It is a vector quantity, and measured in m/s.
i.e velocity =
From the given question,
Displacement =
=
=
= 425
The displacement of woman is 425 miles.
velocity =
= 36.1702 miles/hour
The woman's average velocity during the trip is 36.2 miles/hour.
Answer:
Explanation:
The universal law of gravitation is defined as:
(1)
Where G is the gravitational constant, M and m are the masses of the two objects and r is the distance between them.
The centripetal force can be found by means of Newton's second law:
(2)
Since it is a circular motion, the acceleration can be defined as:
(3)
Where v is the velocity and r is the orbital radius.
Replacing equation (3) in equation (2) it is gotten:
(4)
Hence,
Then, v can be isolated:
So the relationship between speed and orbital radius is given by the expression