In 1896, S. Riva-Rocci developed the prototype of the current sphygmomanometer, a device used to measure blood pressure. When it
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The definition of kinetic energy allows to find the result for the relationship between the energy of the sun and the Earth is:
-
The kinetic energy ratio is
Kinetic energy is the energy due to the movement of bodies, it is given by the relation
K = ½ m v²
where K is the kinetic energy, m the mass of the body and v the velocity of the body.
In a compound motion it is common to separate energy into parts to simplify calculations.
- Translational kinetic energy. Due to the linear movement of the body
- Rotational kinetic energy. Due to the rotational movement of the body.
Where I is the inrtia momentum and w the angular velocity.
They indicate that we compare the kinetic energy of the sun and the Earth.
The Earth has two movements, one of rotation about its axis with a period of T = 24 h and one of translation with respect to the Sun with a period of T= 365 days, therefore the kinetic energy of the Earth.
Linear and rotational speed are related.
v = w r
The Earth is an almost spherical body therefore the moment of inertia of a solid sphere.
I =
Let's subatitute.
The movement of the Earth around the sun is almost circular, therefore we can use the relations of the uniform circular movement, where the angle for one revolution is 2π radians and the time is called the period.
Let's substitute.
Data for Earth are tabulated:
- Mass m = 5.98 1024 kg
- Radius r = 6.37 10⁶ m
- Radius orbits tras = 1.496 10¹¹ m
- Rotation period
= 24 h (
) = 8.64 10⁴s
- Translation period
= 365 d (
) (
Let's calculate.
Let's analyze the kinetic energy for the Sun, this is inside the solar system therefore it has no translation movement and is approximately a sphere with a rotation period of = 27 days.
The kinetic energy of the sun is;
The tabulated data for the sun are:
- Mass m = 1,991 1030 kg.
- Radius R = 6.96 10⁸ m
- Period T = 27 d (
Let's calculate.
The relationship of the kinetic energy of the sun and the Earth is:
In conclusion using the definition of kinetic energy we can shorten the result for the relationship between the energy of the sun and the Earth is:
-
The kinetic energy ratio is:
Learn more about kinetic energy here: brainly.com/question/25959744
Answer:
Yes. Towards the center. 8210 N.
Explanation:
Let's first investigate the free-body diagram of the car. The weight of the car has two components: x-direction: towards the center of the curve and y-direction: towards the ground. Note that the ground is not perpendicular to the surface of the Earth is inclined 16 degrees.
In order to find whether the car slides off the road, we should use Newton's Second Law in the direction of x: F = ma.
The net force is equal to
Note that 95 km/h is equal to 26.3 m/s.
This is the centripetal force and equal to the x-component of the applied force.
As can be seen from above, the two forces are not equal to each other. This means that a friction force is needed towards the center of the curve.
The amount of the friction force should be
Qualitatively, on a banked curve, a car is thrown off the road if it is moving fast. However, if the road has enough friction, then the car stays on the road and move safely. Since the car intends to slide off the road, then the static friction between the tires and the road must be towards the center in order to keep the car in the road.