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Papessa [141]
3 years ago
10

A hoodlum throws a stone vertically downward with an initial speed of 12.0 m/s from the roof of a building,30.0 m above the grou

nd. (a) how long does it take the stone to reach the ground
Physics
1 answer:
bogdanovich [222]3 years ago
8 0
S=ut +1/2at2
30=12t+1/2*10*t2
5t2+12t-30=0
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The electric field of a sinusoidal electromagnetic wave obeys the equation E=(375V/m)cos[(1.99×107rad/m)x+(5.97×1015rad/s)t].a.
andrey2020 [161]

Answer:

A) max = Eo = 375 V/m, B)  B = 125 10⁻⁸ T , C) f = 9.50 101⁴ Hz, D) λ = 3.158 10⁻⁷ m, E)  T = 1.05 10⁻¹⁵ s , F) invisible for humans   G)  v = c = 3 10⁸ m/s

Explanation:

The expression given for the electric field is

       E = 375 cos (1.99 107x + 5.97 105t)

The general formula for the electric field of a transverse traveler is

     E = Eo cos (kx-wt)

Where k is the wave number and w the angular velocity

A) The amplitudes as electric is

     Emax = Eo = 375 V / m

B) the electric and magnetic field are related

     E / B = c

     B = E / c

     B = 375/3 108

     B = 125 10⁻⁸ T

C) angular velocity and frequency is related

    .w = 2π f

     f = w / 2π

     f = 5.97 10¹⁵ / 2π

     f = 9.50 101⁴ Hz

D) the speed of light has the formula

      c = λ f

      λ = c / f

      λ = 3 10⁸ / 9.50 10¹⁴

      λ = 3.158 10⁻⁷ m

E) The period

     T = 1 / f

     T = 1 / 9.5 10¹⁴

     T = 1.05 10⁻¹⁵ s

F) let's reduce the wavelength nm

   λ = 3.158 10⁻⁷ m (10⁹nm / 1m)

   λ = 3.158 10²nm = 315.3 nm

The visible radiation range is between 400nm and 700nm. This radiation is ultraviolet and is invisible humans

G) All electromagnetic radiation has a speed at the speed of light (c)

      v = c = 3 10⁸ m/s

5 0
3 years ago
Diya visited a tailor shop and bought home three cuttings of fabric A,B and C to study their properties. Diya tried burning the
andreev551 [17]

Answer:

Rayon

Wool

Silk Yarn

Explanation:

Rayon

This is Fabric A. Rayon basically burns very quickly even quicker than fabrics like cotton and linen. Its ash is gray in color. The rayon fabric smells of burning paper when it is burnt.

Wool:

This is Fabric B. Wool is basically hard to ignite. It burns slowly. Its ash is dark in color. The wool fabric smells of burning hair when it is burnt.

Silk Yarn:

This is Fabric C. The silk yarn shrinks from the flame when it is burned. It has a grayish black ash. The silk yarn fabric smells burnt meat of  when it is burnt.

3 0
3 years ago
If the specific latent heat of ice is 340 000 J/kg,
Ganezh [65]

Answer:

jsjdgsudgwid s

Explanation:

83638hr is 3738 so 8273 and 837y37 and 82638 say hi to 1937

6 0
3 years ago
1. When an individual suffers from anxiety severe enough to ____________, he might be suffering from an anxiety disorder. (Point
zheka24 [161]
The answers to these questions are:

1. <span>When an individual suffers from anxiety severe enough to DISRUPT HIS DAILY LIFE, he might be suffering from an anxiety disorder.

2. 19 MILLION </span><span>people in the United States suffer from anxiety disorders.  

3. I</span><span>f a patient complains that whenever he has to get on a plane he begins to sweat, have chest pain, and nausea, he is most likely suffering from PANIC DISORDER.

4. THAT IT RUNS IN FAMILIES. A lot of researchers and medical professionals believe that anxiety may be hereditary.
</span><span>
5. ANXIETY </span><span>is a state of intense apprehension, uncertainty, and fear resulting from the anticipation of a threatening event or situation.

6. </span><span>A twin is MORE likely to suffer from an anxiety disorder if the other twin has some form of anxiety disorder.

7. </span><span>Generalized Anxiety Disorder (GAD) is characterized by PROLONGED AND EXCESSIVE WORRY EVEN WHEN THERE IS NO APPARENT CAUSE FOR CONCERN.

8. </span><span>Specific Phobia is characterized by EXAGGERATED OR IRRATIONAL FEAR OF OBJECTS OR SITUATIONS THAT ARE NOT GENERALLY HARMFUL.

9. </span>Post-Traumatic Stress Disorder (PTSD) is characterized by <span>FLASHBACKS OR NIGHTMARES.

10. </span>Obsessive-Compulsive Disorder is characterized by OBSESSIVE, IRRATIONAL THOUGHTS THAT INCREASE/INTENSIFY FEELINGS OF ANXIETY.

These answers are based from what I understand from various sources. Hope this helps. :)
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3 years ago
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umka21 [38]
The answer to the question is true
5 0
3 years ago
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