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pychu [463]
3 years ago
15

An object falls from a height of 12m. The object's potential energy at the top is 50J. Where is the potential energy of the obje

ct
25J
Physics
1 answer:
alex41 [277]3 years ago
5 0

Answer:

the height of the is 6 m.

Explanation:

Given;

potential energy of the object, P.E = 50 J

Height of fall of the object, H = 12 m

Determine the mass of the object, m

P.E = mgh

m = (P.E) / (gh)

m = (50) / (9.8 x 12)

m = 0.425 kg

Let the height of the object at 25 J = h₂

mgh₂ = 25

h₂ = (25) / (mg)

h₂ = (25) / (0.425 x 9.8)

h₂ = 6 m

Therefore, the height of the object at 25 J is 6 m.

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A spring whose stiffness is 980 N/m has a relaxed length of 0. 50 m. If the length of the spring changes from 0. 25 m to 0. 81 m
Gelneren [198K]

151.9j

Explanation:

PE=1/2kx^2

PE=1/2(980)(.50)= 245j

PE=(1/2)(980)(.81)= 396.9j

396.9- 245= 151.9j

8 0
2 years ago
If I was driving at 50 miles an hour and hit a car at a stop light, how would there car react after it is hit?
MA_775_DIABLO [31]

Answer:

The answer is  C.move forward rapidly until stopped.

Explanation:

50 miles an hour is a very high speed. The momentum transfer to the car at stop light will move the car forward rapidly until its brake is able to stop it.

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3 years ago
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the andromeda galaxy is approaching our galaxy with a radial velocity of 120 km/s. given the galaxies present separation of 800
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The andromeda galaxy is approaching our galaxy with a radial velocity of 120 km/s. given the galaxies present separation of 800 kpc, and neglecting both the transverse component of the velocity and the effect of gravity in accelerating the motion, estimate when the two galaxies will collide.

The Andromeda Galaxy, also known as Messier 31, M31, or NGC 224 and originally the Andromeda Nebula, is a barred spiral galaxy that is 2.5 million light-years away from Earth and the closest big galaxy to the Milky Way. It has a diameter of roughly 46.56 kiloparsecs.

The Milky Way, which houses the Solar System and Earth, and the Andromeda Galaxy are anticipated to collide in roughly 4.5 billion years. This galactic collision will take place between the two largest galaxies in the Local Group. The Andromeda galaxy is the brightest galaxy outside of our solar system. It is the furthest object that the majority of us humans can see with our unaided eyes at a distance of 2.5 million light-years.

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2 years ago
A train is speeding down a railroad track at the speed of 50 miles per hour. From whose reference point is the train not moving?
marysya [2.9K]

A: a person sitting on a train

Hence person could have a meal and not get food all over them.

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4 years ago
A man is sitting on a chair with wheels. He grabs a 2.1 kg book from the desk and throws
geniusboy [140]

The speed of the man and the chair after the book is thrown is 0.2 m/s.

The given parameters:

  • <em>mass of the book, m₁ = 2.1 kg</em>
  • <em>speed of the book, u₁ = 7.2 m/s</em>
  • <em>mass of the man, M = 70 kg</em>
  • <em>mass of the book, m = 9.2 kg</em>

<em />

The total mass of the man and the book is calculated as follows;

m₂ = 70 kg + 9.2 kg

m₂ = 79.2 kg

The speed of the man and the chair after the book is thrown is determined by applying the principle of conservation of linear momentum;

m_1 u_1 = m_2u_2\\\\u_2 = \frac{m_1u_1}{m_2} \\\\u_2 = \frac{2.1 \times 7.2}{79.2} \\\\u_2 = 0.2 \ m/s

Thus, the speed of the man and the chair after the book is thrown is 0.2 m/s.

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8 0
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