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2 years ago

3. Which of these will remain unchanged when a sound wave travels from the air to water?

Physics

2 answers:

garri49 [273]2 years ago

7 0

Answer:

B. Frequency :)

Explanation:

andre [41]2 years ago

6 0

Answer:frequency

Explanation:

just take the answer

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A small ball is attached to one end of a spring that has an un- strained length of 0.200 m. The spring is held by the other end,

masya89 [10]

Answer:

$\Delta x=0.002287\ m=2.287\ mm$

Explanation:

Given:

un-stretched length of the spring, $l=0.2\ m$

speed of revolution of the ball in horizontal plane, $v=3\ m.s^{-1}$

length stretch during the motion, $\Delta l=0.01\ m$

Now the radius of revolution of the ball:

$r=l+\Delta l$

$r=0.2+0.01$

$r=0.21\ m$

Now in this case the centrifugal force is equal to the spring force:

$F_c=F_s$

$m.\frac{v^2}{r} =k.\Delta l$

where:

m = mass of the ball

k = spring constant

$m\times \frac{3^2}{0.21} =k\times 0.01$

$k=(4285.714\times m)\ N.m^{-1}$

Now the extension in the spring upon hanging the ball motionless:

$m.g=k.\Delta x$

$9.8\times m=(4285.714\times m)\times \Delta x$

$\Delta x=0.002287\ m=2.287\ mm$

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3 years ago

In order for acceleration to occur, something must be..

hoa [83]

Acceleration occurs whenever the direction or the speed changes

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3 years ago

Explain why a school bus is a compound machine

Zolol [24]

It combines multiplesimple machines working together

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4 years ago

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The Apollo Lunar Module was used to make the transition from the spacecraft to the Moon's surface and back. Consider a similar m

ivolga24 [154]

Answer:

v=6.05 m/s

Explanation:

Given that,

Th initial velocity of the lander, u = 1.2 m/s

The lander is at a height of 1.8 m, d = 1.8 m

We need to find the velocity of the lander at impact. It is a concept based on the conservation of mechanical energy. So,

$\dfrac{1}{2}mv^2-\dfrac{1}{2}mu^2=W\\\\\dfrac{1}{2}mv^2-\dfrac{1}{2}mu^2=F\times d\\\\\dfrac{1}{2}mv^2-\dfrac{1}{2}mu^2=mgd\\\\\dfrac{1}{2}m(v^2-u^2)=mgd\\\\v^2-u^2=2gd$

v is the velocity of the lander at the impact

g is the acceleration due to gravity on the surface of Mars, which is 0.4 times that on the surface of the Earth, g = 0.4 × 9.8 = 3.92 m/s²

So,

$v=\sqrt{u^2+2gd} \\\\v=\sqrt{(1.2)^2+2\times 9.8\times 1.8} \\\\v=6.05\ m/s$

So, the velocity of the lander at the impact is 6.05 m/s.

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3 years ago

In 2-4 sentences, summarize what you know about EM waves.

MaRussiya [10]

Answer:

In physics, electromagnetic radiation refers to the waves of the electromagnetic field, propagating through space, carrying electromagnetic radiant energy. It includes radio waves, microwaves, infrared, light, ultraviolet, X-rays, and gamma rays.

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3 years ago

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