Answer:
The highlight
Impulse corresponds to the change in momentum. Given a soccer ball weighing 0.40kg moving first at 18m/s north and then hit in the opposite direction at 22m/s, the impulse delivered to the ball by the player is approximately 16 kg.m/s in the opposite direction of the initial movement.
In the field of physics, impulse is defined as the change in momentum of an object upon interaction with an external force and is calculated by multiplying the force applied to the object by the time interval (duration) the force was acting. When a soccer player strikes the ball, he or she applies a force that changes the soccer ball's momentum.
Considering your question about the soccer ball, the initial momentum of the ball can be calculated by multiplying its mass (0.40 kg) by its velocity (18 m/s), giving 7.2 kg.m/s north. When the player hits the ball, it moves in the opposite direction (south) with a velocity of 22 m/s. Thus, the final momentum of the ball is 0.40 kg x -22 m/s = -8.8 kg.m/s.
Impulse is the change in momentum, so it's the final momentum minus the initial momentum, which equates to -8.8 kg.m/s - 7.2 kg.m/s= -16 kg.m/s south or +16 kg.m/s north, depending on the coordinate system you choose (north could be either positive or negative). Since the direction reversed, this is why we have a negative sign.
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Hi there!
40 N/m
We can use Hooke's Law:
F = kx or F = -kx
F = force (N)
k = Spring constant (N/m)
x = displacement (m)
We are given the force and displacement, so:
F/x = k
30/0.75 = 40 N/m
gravity dwn, your hand up and equal to grav
When you hold a book at rest, two forces act upon it: the downward gravitational force exerted by the Earth represented as -14ĵ N and the upward force exerted by your hand that equals 14 N, balancing out the weight of the book. These forces cancel each other out, keeping the book at rest as per Newton's Second Law.
When you hold a book at rest in your hand, two primary forces are acting upon it. These are the gravitational force, which is the book's weight pulling it downwards, and the force exerted by your hand, pushing upwards against the book. The downward gravitational force is caused by the earth's mass attracting the book's mass. This force is represented as -14ĵ N in physics. The force exerted by your hand counters this gravitational pull, allowing the book to remain at rest in your hand.
By Newton's second law, since the book is at rest, the net force acting on the book is zero. Meaning, the gravitational force and the force exerted by your hand cancel each other out. This is represented as: FPH + FEH = 0, where FPH is the force exerted by your hand and FEH is the force exerted by the Earth. With proper calculation, the force exerted by your hand on the book equals 14 N in the upward direction, counteracting the book's weight.
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If the density of ice is 0.92 grams / centimeters³. An ice sculptor orders a one cubic meter block of ice then the mass of the ice block would be 920000 grams.
It can be defined as the mass of any object or body per unit volume of the particular object or body.
As given in the problem If the density of ice is 0.92 grams / centimeters³. An ice sculptor orders a one cubic meter block of ice then the mass of the ice block, then we have to find the mass of the ice block,
1 meter³ = 10⁶ centimeter³
The mass of the ice block = density of the ice × volume of the ice
=0.92 grams / centimeters³×10⁶ centimeter³
=920000 grams
Thus, the mass of the ice block would be 920000 grams or 920 kilograms.
To learn more about density from here, refer to the link given below;
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