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FromTheMoon [43]

3 years ago

10

Sunburn is caused by ultraviolet light waves having a frequency of around 10^16 Hz. What is their wavelength if the speed of lig

ht is 3 x 10^8 m/s?
15 nm
69 cm
45 mm
30 nm

1 answer:

Taya2010 [7]3 years ago

5 0

$Given:\\f=10^{16}Hz\\c=3\cdot 10^8\frac{m}{s} \\\\Find:\\\lambda =?\\\\Solution:\\\\\lambda = \frac{c}{f} \\\\\lambda= \frac{3\cdot 10^8\frac{m}{s}}{10^{16}Hz} =3\cdot 10^{-8}m = 30nm$

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A block of mass m 5.00 kg is

vekshin1

<span>a.
the force in the direction of movement
Fx = F x cosA*
Fx = 12 x cos25*
Fx = 10.88
m x a = 10.88
a = 10.88/5
a= 2.18 m/s^2
b.
when the block will be lifted off the floor and when the vertical component
Fy = mg
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c.
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6 0

3 years ago

Supply the missing force necessary to achieve equilibrium. Show your work.

Mumz [18]

<u>Analysing the Question:</u>

We know that equilibrium is the state of a body when it has equal and opposite forces being applied on it

In this case, a net downward force of 496N is being applied and a net upward force of (106 + 106 + 142 + x) N

<u>Finding the missing force:</u>

Since we have to achieve equilibrium, the net upward forces have to be equal to the net downward forces

So, (106 + 106 + 142 + x) = 496

354 + x = 496

x = 496 - 354

x = 142 N

Therefore, the missing force is 142 N

8 0

3 years ago

Sound waves cannot carry energy through. A water B air C a mirror D a vacuum

Ber [7]

I looked up the question and got D- a vacuum

3 0

3 years ago

Two spheres of equal mass, A and B, are projected off the edge of a 1.0 m bench. Sphere A has a horizontal velocity of 10 m/s

suter [353]

Answer:

c. because A will land first becuase its heavier

and D.

Explanation:

4 0

3 years ago

You are woken up in the morning on the farm by a rooster. The rooster is located 30 meters away on top of the 5 meter barn house

algol [13]

Complete Question

The complete question is shown on the first uploaded image

Answer:

The velocity is $v = 18.73 \ m/s$

Explanation:

From the question we are told that

The distance of the rooster from farm house is $d = 30 \ m$

The height of the rooster from the ground is $h = 5 \ m$

The angle at which the alarm clock is thrown is $\theta = 53 ^o$

Let the velocity at which the alarm clock is thrown be v

So the horizontal component of v is mathematically represented as

$v_h = v cos \theta$

The distance covered by the alarm clock toward the horizontal direction at velocity v is

$d = v_h$

=> $d = v_h = vcos \theta * t$

=> $vcos \theta * t = 30$

substituting for $\theta$

$v (cos (53)) * t = 30$

=> $v * t = 50$

Considering the motion of the alarm clock in the vertical direction

So the vertical component of v is mathematically represented as

$v_v = vsin \theta$

The distance covered in the vertical direction is mathematically evaluated as follows

From the equation of motion we have

$h = vsin\theta * t - \frac{1}{2} g t^2$

$v* t sin\theta - 4.9t^2 = 5$

Recall $v * t = 50$

So

$50 \ sin \theta -4.9t^2 = 5$

substituting for $\theta$

$50 \ sin (53) -4.9t^2 = 5$

=> $t =\sqrt{7.1289}$

$t =2.673 \ s$

Now

$v * t = 50$

So

$v * 2.673 = 50$

=> $v = 18.73 \ m/s$

3 0

3 years ago