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Studentka2010 [4]
4 years ago
15

Speed (mph) 58 72 55 65 70 81 66 What car goes the fastest? Put the car speed in order, from fastest to slowest miles per hour.

A) 55, 58, 65, 66, 70, 72, 81 B) 81, 72, 70, 66, 65, 58, 55 C) 81, 70, 66, 65, 58, 55 D) 81, 72, 70, 66, 58, 55
Physics
1 answer:
RoseWind [281]4 years ago
7 0

Answer:

The answer to your question is letter B

Explanation:

Data

Order from fastest to slowest speed

           58 72 55 65 70 81 66

The fastest is  81, then, 72, 70, then, 66, 65 finally 58 and 55

The correct order

       81 mi/h, 72 mi/h, 70 mi/h, 66 mi/h, 65 mi/h, 58 mi/h, 55 mi/h

The other options are from slowest to fastest or a different order.

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A spider spins a web with silk threads of density 1300 kg/m3 and diameter 3.0 μm . a typical tension in the radial threads of su
Tema [17]

Answer:

Explanation:

The velocity of a wave in a string is equal to:

v = √(T / (m/L))

where T is the tension and m/L is the mass per length.

To find the mass per length, we need to find the cross-sectional area of the thread.

A = πr² = π/4 d²

A = π (3.0×10⁻⁶ m)²

A = 2.83×10⁻¹¹ m²

So the mass per length is:

m/L = ρA

m/L = (1300 kg/m³) (2.83×10⁻¹¹ m²)

m/L = 3.68×10⁻⁸ kg/m

So the wave velocity is:

v = √(T / (m/L))

v = √(7.0×10⁻³ N / (3.68×10⁻⁸ kg/m))

v ≈ 440 m/s

The speed of sound in air at sea level is around 340 m/s.  So the spider will feel the vibration in the thread before it hears the sound.

5 0
3 years ago
In the image, not to scale, which phase of the moon would you observe from earth?​
timofeeve [1]

Answer:

The "new" moon phase is being shown because the moon shown is directly between the sun and earth and is not visible from the earth because of the brightess of the sun.

8 0
3 years ago
What is Pressure ? Explain well
Andreyy89







Hi Pupil Here's Your Answer ::





➡➡➡➡➡➡➡➡➡➡➡➡➡





Pressure is defined as the force acting perpendicular on an unit area of the surface.


OR


The thrust per unit area is called Pressure.

let us see, on what factors the pressure depends?


Take a pin having a pointed end and a nail having blunt end. Press then against a cardboard by applying the same force. We find that the pin penetrates deep into the cardboard then the nail. In this case, force acting on two points of the cardboard is same but the area under the tip of the Pin is less than under the tip of the nail.

The effect of the forces of the scene magnitudes on the different area is different.


Conclusions : Pressure acting on the surface is inversely proportional to the area of the surface on which force acts.





⬅⬅⬅⬅⬅⬅⬅⬅⬅⬅⬅⬅⬅





Hope this helps

4 0
3 years ago
Why do you think that if you drop two balls, exactly two balls rise on the other side at a similar speed? Why doesn’t one ball f
Zolol [24]
It conserves both energy and momentum in the collision at the same time. By design, when the balls collide the strings that hold them up are vertical (assuming balls are only swung from one side).

: Hope this helps :)
7 0
3 years ago
Two objects are being lifted by a machine. One object has a mass of 2 kg, and is lifted at a speed of 2
kicyunya [14]

Answer:

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The second object had more kinetic energy than the first one had.

Explanation:

8 0
3 years ago
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