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3 years ago

Classify the waves as longitudinal or transverse

1 answer:

azamat3 years ago

7 0

Transverse waves are always characterized by particle motion being perpendicular to wave motion. A longitudinal wave is a wave in which particles of the medium move in a direction parallel to the direction that the wave moves. ... A sound wave traveling through air is a classic example of a longitudinal wave.

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You observed light passing through lenses and through a set of prisms. Why does refraction occur? Include your lab observations

Butoxors [25]

The refraction occurs because when the light beam hits the prism, it is bent and light ricochets and the light is sometimes separated into the different colors.

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4 years ago

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An actress wears a blue dress. How could you use spot lights to make the dress appear to be black?

astraxan [27]

Answer:

Use a yellow (Red + Green) spotlight to make it look black.

Explanation:

The blue fabric has pigments that can absorb the red and green light. This light is incident on the fabric, therefore, there is no light left to be reflected back, so, at plain sight, the dress will look black.

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4 years ago

PLEASE HELP ME WITH THIS!!!!

vodka [1.7K]

Answer:

wasts materials such as cans. it can hit space crafts and satellites. no one has ever been killed by space debris, space vessels very rarely are seriously damaged.

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3 years ago

A meter stick is at rest on frictionless surface. A hockey puck is going towards the 30cm mark on the stick and is traveling per

faust18 [17]

Answer:

A) $0.306k$

B) $0.1325k$

C) $v_{s_{f}} =7.65(-i)+17.35(-j)$

D) $w=41.64 rads^{-1}$

Explanation:

Given:

hockey puck is moving towards 30cm mark perpendicular to the stick
$m_{s} = 0.05kg$
$m_{h} =0.17kg$
$v_{h_{i} } = 9 ms^{-1}$
after collision the puck is deflected 30°
$v_{h_{f} } =4.5 ms^{-1}$

To find the initial angular momentum about origin which is the 50th mark of the metre scale (It's COM) : angular momentum $L$ = $mv$ x $r$ where, v - is the velocity of the puck perpendicular to the radial vector

r - is the radius vector

∴

A) $L_{i} = m_{h}r*v_{h_{i} }\\L_{i}= 0.17*\frac{50-30}{100} (-i)*9(-j)\\L_{i} = 0.306 k$

B) after collision , it moves 30° from original path;

and it's speed = $\frac{9}{2} =4.5ms^{-1}$ ;

∴the perpendicular velocity $v_{per}$ = 4.5 $cos30$ = $2.25\sqrt{3}$ $ms^{-1}$

⇒ $L=m_{h}r*v=0.17*0.2(-i)*2.25\sqrt{3}(-j) \\L= 0.1325 k$

C) since the net external force on the system is zero , the total momentum of the system can be conserved .

thus ,

$m_{s}v_{s_{i}}+m_{h}v_{h_{i}}=m_{s}v_{s_{f}}+m_hv_{h_{f}}\\0+0.17*9(-j)=0.05*v_{s_{f}}+0.17*(2.25(i)+2.25\sqrt{3}(-j))\\$

solving this we get,

⇒ $v_{s_{f}} =7.65(-i)+17.35(-j)$

D) since there is no external torque about the system ,the angular momentum can be conserved.

$L_{h_{i}}= L_{h_{f}} + Iw$

where ,

$w$ is the angular velocity of the stick.

$I$ is the moment of inertia of the stick about COM :

$I =\frac{m_{s}l^{2}}{12} \\m_{s}=0.05kg\\l=1m\\I = 0.004167 kgm^{2}$

∴

⇒ $0.306k=0.1325k+0.004167w\\w=41.64 rads^{-1}$

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4 years ago

r law 1 I I hr ohm berm died I'm- an m at a r m 100 War I j V m Exam m terms of he movement of . . n molecules. how the air exer

OlgaM077 [116]

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3 years ago