a 0.40kg soccer ball approaches a player horizontally with a velocity of 18m/s north. the player strikes the ball and causes it to move in the opposite direction with a velocity of 22m/s. what impulse was delivered to the ball by the player?
Answers
delta v = change in velocity = velocity final - velocity initial.
= -22m/s - +18m/s = -40m/s.
mdeltav = (0.40kg)(-40m/s) = -16kgm/s or -16Ns.
Final answer:
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.
Explanation:
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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W = F*d
F = W/d
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B volcanic eruption
C fracking for natural gas
D hurricane
Answers
Final answer:
Solar flares can be excluded from a list of interactions among Earth's spheres because they are not directly related to interactions among the geosphere, hydrosphere, atmosphere, and biosphere.
Explanation:
The event that can be excluded from a list of interactions among Earth's spheres is A solar flares. Solar flares are not directly related to interactions among Earth's spheres, which include the geosphere, hydrosphere, atmosphere, and biosphere.
On the other hand, volcanic eruptions, fracking for natural gas, and hurricanes are all examples of interactions among Earth's spheres. Volcanic eruptions involve the release of gases and materials from the geosphere into the atmosphere. Fracking for natural gas involves extracting resources from the geosphere and potentially impacting the hydrosphere. Hurricanes involve interactions between the atmosphere and the hydrosphere, resulting in powerful storms.
Therefore, the correct answer is A solar flares.
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Answers
Answers
Explanation:distance between bridge and water as "x"meters
speed=distance * time
speed= x * 5
speed=5x m/s
Final answer:
The speed of a ball dropped off a bridge that takes 5 seconds to reach the ground is calculated using the equation of motion v = gt. With the acceleration due to gravity approximately 9.8 m/s², the ball would be traveling about 49 m/s just before it hits the water.
Explanation:
This question relates to the physics concept of gravity. When an object is dropped off with no initial velocity, the only force acting upon it is gravity. The speed of the falling object can be found using the equation of motion: v = gt, where g is the acceleration due to gravity (approx. 9.8 m/s²) and t is the time the object is in motion. Therefore, for a ball being dropped off a bridge for 5 seconds, the speed just before hitting the water would be approximately 49 m/s (9.8 m/s² * 5s).
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Answers
Answer:
λ =
Explanation:
Using the De Broglie equation, the characteristic wavelength is given by:
λ =
where
h = Planck's constant = Js.
p = momentum
Momentum, p, can be calculated using:
p =
where
m = mass of the electron = kg
E = Energy of the electron = 13.4 keV = J =
J
=> p =
p =
p = kgm/s
Therefore, characteristic wavelength, λ, is:
λ =
λ =
In physics, the characteristic wavelength is the wavelength associated with an object's kinetic energy. It can be determined using the equations for energy, frequency, and wavelength.
In physics, the characteristic wavelength refers to the wavelength associated with a moving object's kinetic energy. The kinetic energy of an object is given by 1/2mv², where m is the mass of the object and v is its speed.
When an object's kinetic energy is known, we can use the equation E = hf, where E is the energy, h is Planck's constant, and f is the frequency of the wave associated with the object, to find the characteristic wavelength.
The equation is rearranged to solve for f, and then the frequency is used to calculate the wavelength using the formula λ = c/f, where λ is the wavelength and c is the speed of light.
By plugging in the given values of the object's mass and speed, you can determine its characteristic wavelength using these equations.
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b. spring tides
c. wind-generated waves
d. deep-ocean waves
Answers
Charmane throws a rock into a lake. She has created _____.
a. impact waves
b. spring tides
c. wind-generated waves
d. deep-ocean waves
Charmane throws a rock into a lake. She has created impact waves. The answer is letter A.
The answer is A, impact waves