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2 years ago

Throughout the reflection, make sure you have a

Physics

1 answer:

7nadin3 [17]2 years ago

8 0

Answer:

The dependent variable is the variable that is studied while the independent variable is the variable that is being manipulated

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Asteroid A has 3.5 times the mass and 2.0 times the velocity of Asteroid B. If

kaheart [24]

Answer:

K_A = 32.2 10⁶ J

Explanation:

In this exercise we must relate the quantities given to find the kinetic energy

Asteroid A data

m_A = 3.5 m_B

v_A = 2.0 v

they also give the value of the kinetic energy of asteroid A

K_B = 2.3 10⁶ J

the expression for scientific energy is

K = ½ m v²

let's replace

K_A = ½ m_a V_a2

K_A = ½ 3.5 m_B (2.0 v_B)^2

K_A = 3.5 2² (½ m_B v_B²)

K_A = 14 K_B

K_A = 32.2 10⁶ J

8 0

3 years ago

The linear expansion of a material depends on which of the following?

nordsb [41]

Answer:

1. The change in temperature of the material.

2. The length of the material.

3. The type of material.

Explanation:

The term linear expansion is defined as the increase in length of any conductor when there is a change in temperature. The new length of any wire or rod is given by :

$L=L_o(1+\alpha \Delta T)$

$L_o$ is the initial length of the rod

$\alpha$ is the coefficient of linear expansion

$\Delta T$ is the change in temperature

It is clear that the linear expansion of a material depends on :

1. The change in temperature of the material.

2. The length of the material.

3. The type of material.

So, all options are correct.

7 0

2 years ago

If you pull on one end of a skateboard with a force of 10 N, and your friend pulls on the other end with a force of 10 N. What i

Colt1911 [192]

Answer: Imma say balanced

Explanation:

Because if u pull one side of a skate board at 10n and your friend pulls the other side of the skate board at 10n it will be balanced because it doesn't move.

8 0

3 years ago

From what height must an oxygen molecule fall in a vacuum so that its kinetic energy at the bottom equals the average energy of

alexandr1967 [171]

Answer:

The value is $h = 11930 \ m$

Explanation:

From the question we are told that

The temperature is $T = 300 \ K$

Generally the root mean square speed of the oxygen molecules is mathematically represented as

$v = \sqrt{\frac{3 * R * T }{M} } = \sqrt{ 2 * g * h }$

Here R is the gas constant with a value $R = 8.314 \ J\cdot K^{-1} \cdot \ mol^{-1}$

M is the molar mass of oxygen molecule with value $M = 0.032 \ kg /mol$

$\frac{3 * 8.314 * 300 }{0.032} = 2 * 9.8 * h$

=> $h = 11930 \ m$

4 0

2 years ago

A ball is thrown upward from the top of a 25.0 m tall building. The ball’s initial speed is 12.0 m/sec. At the same instant, a p

zimovet [89]

<h2>Person must have 8.18 m/s to catch the ball</h2>

Explanation:

Consider the vertical motion of ball

We have equation of motion s = ut + 0.5at²

Initial velocity, u = 12 m/s

Acceleration, a = -9.81 m/s²

Displacement, s = -25 m

Substituting

-25 = 12 x t + 0.5 x -9.81 x t²

4.905 t² -12t - 25 = 0

t = 3.79 sec

Ball hits ground after 3.79 seconds.

So person need to cover 31 m in 3.79 seconds

Consider the horizontal motion of person

We have equation of motion s = ut + 0.5at²

Initial velocity, u = ?

Acceleration, a = 0 m/s²

Displacement, s = 31 m

Time, t = 3.79 seconds

Substituting

31 = u x 3.79 + 0.5 x 0 x 3.71²

u = 8.18 m/s

Person must have 8.18 m/s to catch the ball

6 0

2 years ago