A scientist designed a foam container to help keep frozen foods from melting. Which best explains how the foam works?
2 answers:
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The sun’s gravitational attraction and the planet’s inertia keeps planets moving is circular orbits.
Explanation:
The planets in the Solar System move around the Sun in a circular orbit. This motion can be explained as a combination of two effects:
1) The gravitational attraction of the Sun. The Sun exerts a force of gravitational attraction on every planet. This force is directed towards the Sun, and its magnitude is
where
G is the gravitational constant
M is the mass of the Sun
m is the mass of the planet
r is the distance between the Sun and the planet
This force acts as centripetal force, continuously "pulling" the planet towards the centre of its circular orbit.
2) The inertia of the planet. In fact, according to Newton's first law, an object in motion at constant velocity will continue moving at its velocity, unless acted upon an external unbalanced force. Therefore, the planet tends to continue its motion in a straight line (tangential to the circular orbit), however it turns in a circle due to the presence of the gravitational attraction of the Sun.
Learn more about gravity:
#LearnwithBrainly
Answer:
1) 57 revolutions.
2) 4.52 m
3) 1531.2 m
Explanation:
Question 1:
Given:
Initial velocity,
Final velocity,
Time,
Acceleration,
Now, displacement of the tire is given as:
Displacement of tire in 1 revolution is equal to its circumference.
Therefore, displacement in 1 revolution =
Now, number of revolutions is given as:
Therefore, the number of revolutions are 57.
Question 2:
Given:
Radius of the wheel is,
Angle of rotation is, °
Converting degree to radians, we get:
Now, path length is given as:
Therefore, the path length of a point on the wheel is 4.52 m
Question 3:
Radius of the wheel is,
Angle of rotation is, radians
Now, path length is given as:
Therefore, the path length of a point on the wheel is 1531.2 m.