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4 years ago

I need help

Physics

1 answer:

Gala2k [10]4 years ago

8 0

The energy of the wave will decrease.

The energy of a wave is given as

E = h f

where E = energy of waver

h = plank's constant

f = frequency of the wave.

From the formula , we see that the energy of the wave is directly proportional to the frequency of the wave. hence as the frequency of the wave decrease, the energy of the wave will decrease.

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8. An ant on a picnic table travels 30 cm eastward, then 25 cm northward, and finally 15 cm westward. What is the ant's displace

wel

Answer:

The displacement of the ant, R = 29.15 cm

The angle of the resultant displacement with its original position is, θ = 30° 57'

The direction of the displacement is towards the northeast.

Explanation:

Given data,

The displacement towards east, d₁ = 30 cm

The displacement towards north, d₂ = 25 cm

The displacement towards west, d₃ = 15 cm

The total displacement towards east,

d₄ = d₁ - d₃

= 30 - 15

= 15 cm

The total displacement of ant is given by the resultant displacement,

R = √(d₂² + d₄² + 2· d₂ d₄ CosФ)

Where Ф is the angle between the vectors, d₂ & d₄

Ф = 90°

Therefore,

R = √(d₂² + d₄²)

Substituting in the above equation,

R = √(25² + 15²)

= 29.15 cm

Hence, the displacement of the ant, R = 29.15 cm

The angle of the resultant displacement with its original position is,

θ = tan⁻¹ (d₄ / d₂)

= tan⁻¹ (15 / 25)

= tan⁻¹ 0.6

= 30° 57'

Hence, the angle of the resultant displacement the its original position is, θ = 30° 57'

The direction of the displacement is towards the northeast.

5 0

4 years ago

Describe how Ridge Push drives plate motion and discuss how it works to move Earth’s plates

Ulleksa [173]

Answer:

Plates at our planet's surface move because of the intense heat in the Earth's core that causes molten rock in the mantle layer to move. It moves in a pattern called a convection cell that forms when warm material rises, cools, and eventually sink down. As the cooled material sinks down, it is warmed and rises again.

Explanation:

4 0

4 years ago

15. Meteoroids can form when comets break apart, creating dust clouds.

Liula [17]

Answer (s):

15. True

16. False

17. True

7 0

4 years ago

If you observe closely, you will notice that the particles leave a trail behind them as they move. The longer the trail, the fas

beks73 [17]

Answer:

when there is a change in the direction

Explanation:

The particle will move faster when there is a change in the direction on the movement

8 0

4 years ago

Electrons are accelerated through a voltage difference of 230 kV inside a high voltage accelerator tube. What is the final kinet

Aliun [14]

Answer:

kinetic energy is 3.68 × $10^{-14}$ J

speed of these electrons is 0.5565 c

Explanation:

Given data

voltage difference = 230 kV

to find out

kinetic energy and speed of these electrons

solution

we know kinetic energy formula that is

kinetic energy = qv

kinetic energy = 1.6 × $10^{-19}$ × 230 × $10^{3}$

kinetic energy = 3.68 × $10^{-14}$ J

and

speed of electron that is

kinetic energy = m1c² - m2 c²

here m1 = m / √(1-v/c)²

KE/mc² = ( 1 / √(1-(v/c)² ) - 1

put value here

3.68 × $10^{-14}$ / (3× 10^8)²×9.11× $10^{-31}$ = ( 1 / √(1-v/c)² ) - 1

0.448835223 = ( 1 / √(1-(v/c)² ) - 1

( 1 / √(1-(v/c)² ) = 0.448835223 + 1 = 1.448835223

√(1-(v/c)² = 1 / 1.448835223 = 0.6902096

(v/c)² = 1 - 0.6902096 = 0.309790

v = 0.5565 c

speed of these electrons is 0.5565 c

5 0

3 years ago