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Oksi-84 [34.3K]

3 years ago

11

When the car was stopped by the tree, its change in velocity during the collision was -6 meters/second. This change in velocity

occurred in 2 seconds. What was the acceleration of the car?

1 answer:

jonny [76]3 years ago

8 0

6 meters per second

You will need to add six two times to find the acceleration

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Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 3 sin (2x) cos 5t wher

Nostrana [21]

Answer:

The wavelength of the interfering waves is 3.14 meters.

Explanation:

Given that,

The equation of standing wave that is formed by interfering two harmonic waves (travelling opposite direction) is given by :

$y=3\ sin(2x)\ cos(5t)$ ........(1)

The general equation of standing wave is given by :

$y=2A\ sin(kx)\ cos(\omega t)$ ..............(2)

On comparing equation (1) and (2), we get :

k = 2

We know that,

$\dfrac{2\pi}{\lambda}=k$

$\dfrac{2\pi}{\lambda}=2$

$\lambda=3.14\ m$

So, the wavelength of the interfering wave is 3.14 meters. Hence, this is the required solution.

8 0

4 years ago

A welding torch produces a flame by burning acetylene fuel in the presence of oxygen. This flame is used to melt a metal. Which

mart [117]

<u>Answer</u>

Chemical energy in to thermal energy

<u>Explanation</u>

When acetylene fuel is burning in presence of oxygen, we have chemical process taking place. The torch is used to heat metal to its kindling temperature in oxy-fuel cutting. The steam of gas is then trained on the metal burning it into a metal oxide that flows out of the spout.

So the energy transformation represents this process is <em>Chemical energy into thermal energy </em>

5 0

3 years ago

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A police car is traveling at a speed of 50 meters per second when it suddenly accelerates at a rate of 5 m/s2. How fast will the

Virty [35]

Answer:i don't know sorry good luck tho

Explanation: i have not learned it yet

6 0

4 years ago

A 0.600 kg block is attached to a spring with spring constant 15 N/m. While the block is sitting at rest, a student hits it with

gulaghasi [49]

Answer:

8.8 cm

31.422 cm/s

Explanation:

m = Mass of block = 0.6 kg

k = Spring constant = 15 N/m

x = Compression of spring

v = Velocity of block

A = Amplitude

As the energy of the system is conserved we have

$\dfrac{1}{2}mv^2=\dfrac{1}{2}kA^2\\\Rightarrow A=\sqrt{\dfrac{mv^2}{k}}\\\Rightarrow A=\sqrt{\dfrac{0.6\times 0.44^2}{15}}\\\Rightarrow A=0.088\ m\\\Rightarrow A=8.8\ cm$

Amplitude of the oscillations is 8.8 cm

At x = 0.7 A

Again, as the energy of the system is conserved we have

$\dfrac{1}{2}kA^2=\dfrac{1}{2}mv^2+\dfrac{1}{2}kx^2\\\Rightarrow v=\sqrt{\dfrac{k(A^2-x^2)}{m}}\\\Rightarrow v=\sqrt{\dfrac{15(0.088^2-(0.7\times 0.088)^2)}{0.6}}\\\Rightarrow v=0.31422\ m/s$

The block's speed is 31.422 cm/s

4 0

3 years ago

What is science please help

Brums [2.3K]

Answer:

Explanation:

Science is an objective, self correcting method for gathering and organizing information about the natural world through repeated observation and experimentation.

3 0

3 years ago

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