The energy of the ball has been reduced by joules after bouncing back. This reduction happens because potential energy transforms to energy.

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Answer 1

Answer: This reduction happens because potential energy transforms to "thermal energy" and "sound energy"

Hope this helps!

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5 example of the 1st , 2nd , 3rd law.

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Answer:

The question seems to refer to Newton's Laws of Motion. Here are examples of the 1st, 2nd, and 3rd laws:

1st Law (Law of Inertia):

- An object at rest tends to stay at rest, and an object in motion tends to stay in motion with the same speed and direction unless acted upon by an external force.

- Example: When a car suddenly stops, passengers continue to move forward due to their inertia until a seatbelt or airbag applies a force to stop them.

2nd Law (Law of Acceleration):

- The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.

- Example: When pushing a heavy box and a lighter box with the same amount of force, the lighter box accelerates more because it has less mass.

3rd Law (Law of Action and Reaction):

- For every action, there is an equal and opposite reaction.

- Example: When you push against a wall, the wall pushes back with an equal amount of force.

It's important to note that these laws are foundational principles in classical physics and are widely applicable in understanding the behavior of objects in motion.

Explanation:

John’s mass is 91.2 kg, and Barbara’s is 51.9 kg. He is standing on the x axis at xJ = +9.99 m, while she is standing on the x axis at xB = +3.27 m. They switch positions. How far and in which direction does their center of mass move as a result of the switch?

Answers

Answer:

the center of gravity moves by 1.9 m towards the origin

Explanation:

from the question we are given the following

John's mass (Mj) = 91.2 kg

Barbara's mass (Mb) = 51.9 kg

John's location (Xj) = + 9.99 m

Barbara's location (Xb) = +3.27 m

center of mass (X) = ?

the center of mass is where the masses of John and Barbara is concentrated, and it is given by the formula below

X = ( ( Mj x Xj ) + ( Mb x Xb ) ) / (Mj + Mb)

X = ( ( 91.2 x 9.99 ) + ( 51.9 x 3.27 ) ) / ( 91.2 + 51.9 )

X = 7.6 m

now when they switch positions their locations now become

John's location (Xj) = + 3.27 m

Barbara's location (Xb) = +9.99 m

now putting their new locations into the formula

X = ( ( 91.2 x 3.27 ) + ( 51.9 x 9.99 ) ) / ( 91.2 + 51.9 )

X = 5.7 m

therefore the center of mass moves by

7.6 - 5.7 = 1.9 m

the center of gravity moves by 1.9 m towards the origin

cleopatra needle, an ovelisk given by the egyptian government to great britian in the 19th century, is 20+m tall and has a mass of about 189,000 kg. suppose the monument is lowered onto its side and dragged horizontally to a new location. an applied force of 760,000 N is excerted on the monument, so that its net acceleration is 0.11 m/s2. what is the weight, the net force, the frictional force and the coefficient of friction phycis

Answers

To solve this problem, we can use Newton's second law and the equations of motion. First, let's calculate the weight of the Cleopatra's Needle, which is the mass multiplied by the acceleration due to gravity (9.81 m/s²):

Weight = mass × acceleration due to gravity
Weight = 189,000 kg × 9.81 m/s² ≈ 1,854,090 N

Next, let's calculate the net force acting on the monument using Newton's second law (F = m × a), where F is the force, m is the mass, and a is the acceleration:

Net Force = mass × acceleration
Net Force = 189,000 kg × 0.11 m/s² ≈ 20,790 N

The net force applied is 760,000 N, so the frictional force can be calculated by subtracting the net force from the applied force:

Frictional Force = Applied Force - Net Force
Frictional Force = 760,000 N - 20,790 N ≈ 739,210 N

The coefficient of friction (μ) can be calculated using the formula for frictional force (Frictional Force = μ × Normal Force). Since the normal force is equal to the weight of the monument:

μ = Frictional Force / Weight
μ = 739,210 N / 1,854,090 N ≈ 0.3987

So, the coefficient of friction is approximately 0.3987.

Which describes how the same force affects a small mass and a large massA.The large mass accelerates faster
B.The small mass accelerates faster
C.Both accelerate at the same time

Answers

The same force accelerates a small mass faster than
it accelerates a large mass.

It's easier to get a little red wagon going by pushing it
than it is to get a school bus going by pushing it.

Relationship between oceanography and cryosphere

Answers

Oceanography is the study of the ocean and the cryosphere are the portions of the earth that are just frozen water (ice). When fresh water glaciers melt, they lower the salt levels in the ocean and and oceanographer studies that and makes sure that it wont have too much of an effect. The cryosphere plays a significant role in the global climate.

At what speed v will the length of a 1.00 m stick look 13.7 % shorter (86.3 cm )Using formula L=Lp sqrt 1-v^2/c^2

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L= Lp - 13.7*Lp/100 = Lp-0,137Lp = 0,8613Lp

⇒L/Lp = 0.8613

From the formula above L/Lp = √(1-v^2/c^2)

(L/Lp)^2 = 1 - (v^2/c^2)

v^2/c^2 = 1 - (L/Lp)^2

v/c = √[1 - (L/Lp)^2]

v = c √[1-(L/Lp)^2]

v =c√[1-0.8613^2] = 0.508c

In the vacumm speed of light, c, is approx 300,000,000 m/s

v =0.508 (300,000,000m/s) =152,400,000 m/s

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