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ohaa [14]
3 years ago
6

Sebuah pegas memiliki beban 5 kg dan digantung vertikal. Jika pegas tersebut bertambah panjang 7 cm maka perubahan energi potens

ial pegas tersebut adalah…
Physics
2 answers:
devlian [24]3 years ago
7 0

Answer:

Perubahan energi potensial pegas adalah 17.1675 J

Explanation:

Untuk menyelesaikan pertanyaan, kami mencatat bahwa energi potensial elastis diberikan sebagai;

Energi potensial elastis= E_p=\frac{1}{2} \times k \times x^{2}

Dimana:

k = Konstanta pegas

x = perpanjangan musim semi = 7 cm = 0.07 m  

Paksa di musim semi =   -kx

Di mana, pegas adalah satu-satunya objek yang berkontribusi pada gaya yang kita miliki

Memaksa= m×g = 5 × 9.81 = 49.05 N

Karena itu, k = 49.05/0.07 = 700.714 N/m

Oleh karena itu, perubahan energi potensial elastis adalah

E_{p1}=\frac{1}{2} \times k \times x_1^{2}\\E_{p2}=\frac{1}{2} \times k \times x_2^{2}\\\Delta E_p = E_{p2} -E_{p1} = \frac{1}{2} \times k \times x_2^{2} - \frac{1}{2} \times k \times x_1^{2} = \frac{1}{2} \times k \times (x_2^{2} - x_1^{2})

Kami memiliki, x₁ = 0 m karena pegas diasumsikan awalnya tidak diregangkan

Karena itu,

\Delta E_{p}=\frac{1}{2} \times k \times x_2^{2}

\Delta E_{p}=\frac{1}{2} \times 700.714 \times 0.07^{2} = 17.1675 J and

Perubahan energi potensial pegas = 17.1675 J

professor190 [17]3 years ago
5 0

Answer:

It is elastic potential energy

Explanation:

Elastic potential energy is stored energy that results from applying a force to deform an elastic object. The energy is stored until the force is removed and the elastic object returns to its original shape, doing work in the process. Deformation may involve compressing, stretching, or twisting the object. Many objects are specifically designed to store elastic potential energy, for example:

The spring of a winding watch.

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2 years ago
A bowling ball moving with a velocity of 5V to the right collides elastically with a beach ball moving at a velocity 2V to the l
katen-ka-za [31]

Answer:

v'_2=3V

Explanation:

From the question we are told that:

Bowling ball Speed v_1=5 m/s

Beach ball Speed v_2=2 m/s

Let The Mass be equal i.e

 M_1=M_2

Therefore

Generally the equation for Velocity of beach ball after collision v'_2 is mathematically given by

Since Velocity is Vector Quantity

Therefore

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3 years ago
An object with total mass mtotal = 14.6 kg is sitting at rest when it explodes into three pieces. One piece with mass m1 = 4.9 k
zheka24 [161]

Answer: 1) 0. 2) 4.2 Kg. 3) 15.4 m/s 4) 12.9 m/s 5) 0. 6) 3.62 KJ.

Explanation:

1) Assuming that no external forces act during the collision, total momentum must be conserved. As initially the total mass was at rest, so initial momentum is zero, final momentum of all the system must be 0 also.

2) After the explosion, as mass must be conserved also, the sum of the masses of the three pieces must be equal to the original total mass, so we can write the following:

m₁ + m₂ + m₃ = M = 14.6 Kg = 4.9 Kg + 5.5 Kg + m₃

Solving for m₃, we have:

m₃ = 14.6 Kg - 4.9 Kg -5.5 Kg = 4.2 Kg.

3) and 4)

As momentum is a vector, if it is magnitude must be 0, this means that all his components must be 0 too.

So, we can write two equations, one for the x-component, and other for the y-component, as follows:

pₓ = m₁. v₁ₓ + m₂.v₂ₓ + m₃.v₃ₓ = 0

py = m₁.v₁y + m₂. v₂y + m₃. v₃y =0

Replacing by the values, and solving for v₃ₓ and v₃y, we get:

v₃ₓ = 15.4 m/s

v₃y = 12.9 m/s

v = √(15.4)²+(12.9)² = 20.1 m/s

5) As the center of mass must move as if all the mass were concentrated in this point, and we know that the total momentum must be 0, this tells us that the magnitude of the velocity of the center of mass must be 0 too.

6) As initial kinetic energy is 0, as  the mass was at rest, the increase in the kinetic energy is obtained simply adding the kinetic energy of every piece of mass gained after explosion, as follows:

K = K₁ + K₂ + K₃ = 1/2 (m₁ . v₁² + m₂.v₂² + m₃.v₃²)

Replacing by the values, we get:

K= 3.62 KJ

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The point in a fixed pulley resembles the support of a lever. The remainder of the pulley behaves like the fixed arm of a first-class lever, since it rotates around a point. The distance from the fulcrum is the equivalent on the two sides of a fixed pulley. A fixed pulley has a mechanical advantage of one. Hence, a fixed pulley doesn't increase the force.

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