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julia-pushkina [17]

3 years ago

14

Chloe is playing the flute some distance away from a crowd. If the atmospheric temperature is 15°C, what is the speed of the sou

nd traveling from the flute?
A.) 340 meters/second

B.) 330 meters/second

C.) 320 meters/second

D.) 310 meters/second

E.) 300 meters/second

1 answer:

borishaifa [10]3 years ago

7 0

I believe the answer to your question is A. 340 meters/second hope i helped

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Explain why the poles are colder than the tropics.?

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The poles don’t receive direct sunlight which is why they are colder than the tropics. Even during the summer the sun is low on the horizon.

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3 years ago

What is the physical dimension for moment

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The dimensional formula for the moment of force is [M1L2T−2].

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3 years ago

You move a 25 N object in 10s with 100 W of power.<br> How far did you move the object?

sergejj [24]

Answer:

Distance = 40 meters.

Explanation:

Given the following data;

Force = 25N

Time = 10 seconds

Power = 100 Watt

To find the distance;

First of all, we would determine the work done;

Workdone = power * time

Workdone = 100 * 10

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8 0

3 years ago

A 0.89 kg ball is moving horizontally with a speed of 3.8 m/s when it strikes a vertical wall. The ball rebounds with a speed of

Julli [10]

Answer:

The change in momentum, p = -4.539 kg-m/s

Explanation:

It is given that,

Mass of the ball, m = 0.89 kg

Initial speed of the ball, u = 3.8 m/s

Final speed of the ball, v = -1.3 m/s (as it rebounds)

Let p is the change in linear momentum of the ball. We know that the linear momentum is equal to the product of mass and velocity. It is given by :

$p=m(v-u)$

$p=0.89\ kg\times ((-1.3)-3.8)\ m/s$

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4 0

3 years ago

Four forces are exerted on a disk of radius R that is free to spin about its center, as shown above. The magnitudes are proporti

Dmitry_Shevchenko [17]

The given magnitude of forces of F₁ = F₄, F₂ = F₃, F₁ = 2·F₂, give the

forces that exert zero net torque on the disk as the options;

(B) F₂

(D) F₄

<h3>How can the net torque on the disk be calculated?</h3>

The given parameters are;

F₁ = F₄

F₂ = F₃

F₁ = 2·F₂

Therefore;

F₄ = 2·F₂

In vector form, we have;

$\vec{F_4} = \mathbf{\frac{\sqrt{3} }{2} \cdot F_4 \cdot \hat i - 0.5 \cdot F_4 \hat j}$

$\vec{F_2} = \mathbf{ -F_2 \, \hat j}$

Clockwise moment due to F₄, M₁ = $-0.5 \times F_4 \, \hat j \times \dfrac{R}{2}$

Therefore;

$M_1 =- 0.5 \times 2 \times F_2 \, \hat j \times \dfrac{R}{2} = \mathbf{ -F_2 \, \hat j \times \dfrac{R}{2}}$

Counterclockwise moment due to F₂ = $-F_2 \, \hat j \times \dfrac{R}{2}$

Given that the clockwise moment due to F₄ = The counterclockwise moment due to F₂, we have;

Two forces that combine to exert zero net torque on the disk are;

F₂, and F₄

Which are the options; (B) F₂, and (D) F₄

Learn more about the resolution of vectors here:

brainly.com/question/1858958

4 0

2 years ago