¿Qué es la velocidad?
1 answer:
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The characteristics of the projectile launch allows to find the results for the questions about the movement of the ball are:
- In the attached we see the vertical speed decreases with height and the curve is of the parabolic type.
- In the movement is several dimensions, each one is independent of the others, the movement in the x axis does not affect the movement in the y axis.
Kinematics studies the motion of bodies looking for relationships between position, velocity and acceleration. In the case of vertical and projectiles launch the acceleration on the vertical axis is the acceleration of gravity directed downward.
In the attachment we can see the position of the ball for two distances in the case of projectile launching.
We can see that the speed of the ball decreases with height according to the relation
y = go t - ½ g t²
Where y is the height, g is the initial vertical velocity, g is the acceleration of gravity and t is time.
In all movements in various dimensions we assume that each movement in an . axis is independent
In the case of projectile launching, on the vertical axis there is an acceleration of gravity and on the horizontal axis there is no acceleration, the only parameter that this gives the two movements is the time, which is a scalar.
In conclusion, using the characteristics of the projectile launch, we can find the results for the questions about the movement of the ball are:
- In the movement is several dimensions, each one is independent of the others, the movement in the x axis does not affect the movement in the y axis.
- In the attached we see the vertical speed decreases with height and the curve is of the parabolic type.
Learn more about projectile launch here: brainly.com/question/24888457
5)
In physics, forces are interactions that are able to change the velocity of an object.
Force is a vector quantity, so it has a magnitude and a direction.
The SI units of the force is the Newton (N).
Whenever an unbalanced force is applied to an object, the object experiences an acceleration, according to Newton's second law of motion:
where
F is the force
m is the mass of the object
a is its acceleration
So, the acceleration of an object is proportional to the force applied:
6)
In physics, arrows are used to represent vector quantities. Therefore, they are also used to represent forces.
In particular, when a vector quantity is represented by an arrowr:
- The length of the arrow is proportional to the magnitude of the vector quantity
- The direction of the arrow corresponds to the direction of the vector quantity
Therefore, if a force is represented through an arrow:
- The length of the arrow shows the strength (magnitude) of the force
- The direction of the arrow shows the direction of the force
7)
As we said in part 5), the SI units of the force is the Newton (N).
We can rewrite the Newton in terms of fundamental units only. We can do it starting from the equation:
where
F is the force
m is the mass
a is the acceleration
- The mass is measured in kilograms (kg)
- The acceleration is measured in meters per second squared ()
Therefore, 1 N corresponds to:
B)
Gravity is an attractive force that exists between all objects that have mass. See more explanations about gravity in part 4).
3)
Mass is a scalar quantity; it gives us a measure of the "amount of matter" contained in an object.
The SI unit of the mass is the kilogram (kg).
Being a scalar, mass has no direction, but only a magnitude.
Moreover, the mass is an intrinsec property of an object: therefore, it does not depend on the location of the object. So, an object has always the same mass, either it is on Earth or on another planet.
On the other hand, the force of gravity on an object depends on its location, so it changes.
4)
As we said in part 3), gravity is an attractive force that exists between all objects that have mass.
The magnitude of the force of gravity between two objects is given by the Universal Law of gravitation:
where
G is the gravitational constant
m1, m2 are the masses of the two objects
r is the separation between the objects
From the equation above, we observe that:
- all objects are attracted to one another with a gravitational force that is proportional to the mass of the objects and inversely proportional to the square of the distance between them.
And so:
a. When the mass of one or both objects increases, the gravitational force between the objects increases
b. When the distance between two objects increases, the attraction between the objects decreases
Explanation:
(10) Mass of a soccer player, m = 0.42 kg
Initial speed, u = 0
Final speed, v = 32.5 m/s
Time, t = 0.21 s
We need to find the force that sends soccer ball towards the goal.
Force, F = ma
So, 65 N of force soccer ball sends towards the goal.
(11) Mass of the satellite, m = 72,000 kg
Initial speed, u = 0 m/s
Final speed, v = 0.63 m/s
Time, t = 1296 s
We need to find the force is exerted by the rocket on the satellite.
Force, F = ma
So, 35 N of the force is exerted by the rocket on the satellite.
Hence, this is the required solution.