This picture represents<br> A: Reflection<br> B: Refraction<br> C: Interference<br> D: Diffraction

Please help will mark brainliest

andreyandreev [35.5K]

Answer:

b

Explanation:

it melts yes but it's still water [same element] so there fore it's a physical change

7 0

3 years ago

Read 2 more answers

Answer the following in 1-2 complete sentences:

mojhsa [17]

Answer:

The graph with a more steeper slope

Explanation:

If the x axis represented time and the y axis represented speed the steeper the slope the more faster something was moving in a shorter amount of time. On the other hand a less steeper slope means an object is gradually picking up speed in a longer amount of time thus makeing it slower

HOPE THIS HELPED:)

8 0

3 years ago

A compact disc (CD) is played by a cd player, which uses a laser to read the tracks on the disc. The disc spins initially at app

uranmaximum [27]

Answer:

a. The laser tracking mechanism experiences a changing tangential velocity

c. The laser tracking mechanism experiences a non-zero angular acceleration

d. The laser tracking mechanism experiences a non-zero tangential acceleration

Explanation:

a. The laser tracking mechanism experiences a changing tangential velocity

This is because the tangential velocity v = rω where r = radius of disc and ω = angular speed of discs. Since r is constant, v ∝ ω.

Since the angular speed changes from 200 rpm to 500 rpm, thus, the tangential velocity would also change.

So, the laser tracking mechanism experiences a changing tangential velocity

c. The laser tracking mechanism experiences a non-zero angular acceleration

Since angular acceleration, α = Δω/Δt where Δω = change in angular speed and Δt = change in time.

Since there is a change in angular speed from 200 rpm to 500 rpm in time Δt, there is thus a non-zero angular acceleration.

So, The laser tracking mechanism experiences a non-zero angular acceleration

d. The laser tracking mechanism experiences a non-zero tangential acceleration

Since tangential acceleration, a = rα where r = radius of disc and α = angular acceleration.

Since there is an angular acceleration of the disc, there is thus going to be a tangential acceleration given by a = rα.

So, the laser tracking mechanism experiences a non-zero tangential acceleration

Statement b is false because, the disc experiences a changing angular speed from 200 rpm to 500 rpm.

4 0

2 years ago

What causes an electric current in a wire?

VashaNatasha [74]

Well let's analyse.

First we know Ohm's law of resistance that states:

$R=\dfrac{U}{I}$

Where R is resistance, U is voltage and I is current.

If we express current we get:

$I=\dfrac{U}{R}$

Because resistance cannot be equal to 0 (violation of mathematical law) the only thing that may cause current being zero is voltage.

Which means that as long as your voltage is bigger than 0V then there will be current (if we are talking about AC).

So to answer the question: Electric current is caused by voltage and regulated by resistance.

Hope this helps.

r3t40

3 0

3 years ago

A force of 62 N acts on a 35 kg object for 10.0s. What is the objects change in momentum?

Makovka662 [10]

Answer:

Δp = 620 N.s

Explanation:

Newton's second law, was originally conceived as follows:

$F = \frac{\Delta p}{\Delta t} (1)$

In this way, a net force applied on an object, is equal to the rate of change of the momentum of the object regarding time.

for m= constant, it reduces to F= m*a.

Replacing in (1) F= 62 N, and Δt = 10.0 s, we can solve for Δp (object's change in momentum) , as follows:

$\Delta p = F* \Delta t = 62 N* 10.0 s = 620 N*s (2)$

7 0

3 years ago

This picture represents A: Reflection B: Refraction C: Interference D: Diffraction