Answer:
a) 5 m from the finish line
b) 4875 s
Explanation:
distance = 1 km
tortoise speed = 0.2 m/s
speed of hare = 8 m/s
time take by hare t reach 0.8 km =
time taken by tortoise to travel 1 km =
time taken by the hare to travel 0.2 km =
time taken by the tortoise to travel 0.2 km =
distance traveled by tortoise in 25 second = 25 × 0.2 = 5 m
a) when tortoise is 5 m from the finish line then hare will resume the race.
b) the hare will be stationary for = 5000 - 125 = 4875 s
Explanation:
It is given that,
Density of asteroid,
Mass of asteroid,
We need to find the diameter of the asteroid. The formula of density is given by:
V is the volume of spherical shaped asteroid,
r = 2441311.12 m
Diameter = 2 × radius
d = 4882622.24 m
or
Hence, this is the required solution.
The gravitational force of the planet pulling on the sun is equal to the gravitational force of the sun pulling on the planet
Explanation:
We can solve this problem by applying Newton's third law, which states that:
<em>"When an object A exerts a force (called </em><em>action</em><em>) on an object B, then object B exerts an equal and opposite force (called </em><em>reaction</em><em>) on object A"</em>
In this problem, we can identify:
- The sun as object A
- The planet as object B
By applying Newton's third law, we can state that:
- The action is the gravitational force exerted by the sun on the planet
- The reaction is the gravitational force exerted by the planet on the sun
According to the law, the two forces are equal in magnitude and opposite in direction: so, we can conclude that
The gravitational force of the planet pulling on the sun is equal to the gravitational force of the sun pulling on the planet
Learn more about Newton's third law:
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Answer:
The change of energy is 60J
Explanation:
We have a closed system, which receives 80 J of energy. It means this energy is entering the system. And also we have 20 J that is dissipating in the shape of heat.
Therefore the amount remaining in the system will be 80 - 20 = 60 J
Because the mass of the chairs is so small, if they didn't have any friction or any other force against them they may move if given enough time, but since their mass is so low its nothing compared to the gravity of planets