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3 years ago

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Two students, Jordan and Taylor, are talking about light. Jordan says that light behaves as a stream of particles. Taylor declar

es that light behaves as a wave. Which student is correct?

1 answer:

FrozenT [24]3 years ago

3 0

Answer:

"Both students are correct. When light is traveling through small openings, solids, liquids, gases, or a vacuum, it behaves like a wave. When it interacts with matter, it acts like a stream of particles."

Explanation:

just got it right

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Computes average speed when a person walk for 1 minute at speed of 1.5 m/s and another 1 minute at speed of 3.5 m/s along a stra

Vinvika [58]

Answer:

2.5 m/s

Explanation:

(60*1.5+60*3.5)/120=2.5

or

(1.5+3.5)/2=2.5

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3 years ago

A rock is thrown from a height of 2.0 m at a window that is located 9.0 m above the ground. The initial velocity of the rock is

ELEN [110]

Answer:

The value is $x = 11.81 \ m$

Explanation:

From the question we are told that

The height is h = 2.0 m

The height of the window is $d = 9.0 \ m$

The initial velocity of the rock is $u = 20 \ m/s$

The angle at which it is thrown is $\theta = 40$

Generally the vertical component of the velocity of the stone is mathematically represented as

$v_y = 20 sin (40)$

=> $v_y = 12.86 \ m/s$

Generally the height of the window from the ground is mathematically represented as using kinematic equation as

$d = h + v_yt + \frac{1}{2} gt^2$

=> $9 = 2 +12.86 t + \frac{1}{2} * - 9.8 t^2$

Here g is negative -9.8 m/s^2 because the direction of the stone is against gravity

So

$4.9 t^2 -12.86 t + 7 =0$

Solving this quadratic equation using quadratic formula we obtain

t = 0.770 s

Generally the velocity of the stone on the x axis is mathematically represented as

$v_x = 20 * cos(40 )$

=> $v_x = 15.32 \ m/s$

Generally the distance between the person throwing the rock and the window is mathematically represented as

$x = v_x * t$

=> $x = 15.32 * 0.771$

=> $x = 11.81 \ m$

8 0

3 years ago

A water wave passes by a floating leaf that is made to oscillate up and down two complete cycles each second, which means that t

lina2011 [118]

Answer:

2 Hz.

Explanation:

Frequency is simply defined as the number of appearances of a periodic event occurring per time. It is usually measured in cycles/second.

Now, in this question, we are told that there are 2 cycles for each second.

Thus, we can say that the frequency is 2 cycles/1 s = 2 Hz.

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3 years ago

a quantity of water is poured into a graduated cylinder, which reads 139 mL. what is the mass of the water in kilograms?

alexgriva [62]

The mass of water is 0.139 kg

Explanation:

The density of a substance is given by the equation

$\rho = \frac{m}{V}$

where

$\rho$ is the density

m is the mass of the substance

V is its volume

In this problem we have:

V = 139 mL is the volume of water

The density of water is:

$\rho = 1 g/mL$

Solving the equation for m, we find its mass:

$m=\rho V = (1.0)(139)=139 g$

And converting into kilograms,

$m=139 g = 0.139 kg$

Learn more about mass and density:

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A converging lens has a focal length of 20 cm. An object 1 cm tall is placed 10 cm from the center of the lens. What is the heig

SCORPION-xisa [38]

Answer: 2 cm

Explanation:

Given , for a converging lens

Focal length : $f=20\ cm$

Height of object : $h=1\ cm$

Object distabce from lens : $u=-10\ cm$

Using lens formula: $\dfrac{1}{f}=\dfrac{1}{v}-\dfrac{1}{u}$ , we get

$\dfrac{1}{20}=\dfrac{1}{v}+\dfrac{1}{10}$ , where v = image distance from the lens.

On solving aboive equation , we get

$\dfrac{1}{v}=\dfrac{1}{20}-\dfrac{1}{10}=\dfrac{1-2}{20}=\dfrac{-1}{20}\Rightarrow\ v=-20\ cm$

Formula of Magnification : $m=\dfrac{v}{u}=\dfrac{h'}{h}$ , where h' is the height of image.

Put value of u, v and h in it , we get

$\dfrac{-20}{-10}=\dfrac{h'}{1}\\\\\Rightarrow\ h'=2\ cm$

Hence, the height of the image is 2 cm.

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3 years ago