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Greeley [361]
3 years ago
6

Please Help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!11

Physics
1 answer:
Svetlanka [38]3 years ago
6 0

Answer:

a)The correct answer is option X

b)The correct answer is option Z

Explanation:

For question 3 -

When the 2 waves interfere , they add up at all the points

Since the 2 waves have 0 phase difference (as seen from the diagram) , the resultant wave also has 0 phase difference.

The amplitude of 2 waves will simply add up -

A_{1} = 1

A_{2} = 0.5

∴A_{net} = A_{1} + A_{2} = 1.5

The resultant wave should also have 0 displacement at origin.

∴The correct answer is option X

For question 35 -

The 2 waves are out of phase by 180°

∴ The amplitude of two waves would simply get subtracted -

A_{1} = 1

A_{2} = 1

∴A_{net} = A_{1} - A_{2} = 0

Since the amplitude is 0 the displacement of wave would be 0 at every point.

∴ The correct answer is option Z

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Answer: 12Mg/h

Explanation:

Let the spring is compressed by a distance x,before the lift stops,then

Mg(h+x)= 1/2 kx^2 ............... 1

Kx - Mg = M ( 5g ) ............ 2

Make x the subject in equation 2

Kx = 5Mg + Mg

Kx = 6Mg

x = 6Mg/k ............ 3

Put equation 3 into 1

Mg ( h + x ) = 1/2 kx^2

Mgh + Mgx = 1/2kx^2

Mgh + Mg × 6Mg/k = 1/2k × ( 6Mg/k )^2

Mgh + Mg× 6Mg/k = 1/2k 36M^2g^2/ k^2

h =18Mg/k - 6Mg/h

K = 12Mg/h

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8 0
3 years ago
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valentina_108 [34]

Answer: C I think.

Explanation:

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nadya68 [22]

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2 years ago
What is the name of the process in which oceanic crust moves apart at mid-ocean ridges due to convention currents in the mantle?
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A 1500 kg car skids to a halt on a wet road where μk = 0.47. You may want to review (Pages 141 - 145) . Part A How fast was the
shusha [124]

The car travels at a speed of 25m/s.

<u>Explanation:</u>

Given-

Mass, m = 1500kg

Coefficient of friction, μk = 0.47

Distance, x = 68m

Speed, s = ?

We know,

Force, F = ma

and

F = μ X m X g

Therefore,

μ * m * g = m * a

μ * g = a

Let, g = 9.8m/s²

So,

a = 0.47 * 9.8 m/s^2

a = 4.606m/s^2

We know,

v^2 - u^2 = 2as

where, v is the final velocity

           u is the initial velocity

           a is the acceleration

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If the car comes to rest, the final velocity, v becomes 0.

So,

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The car travels at a speed of 25m/s.

6 0
3 years ago
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