-2

A horizontal wire 1 m long carries 0.4 A and is oriented 30° N of W. The Earth's magnetic field runs due north at this location

alexira [117]

Answer:

Explanation:

Force on a current carrying conductor in a magnetic field is given by the following expression

F = B i L where B is magnetic field perpendicular to wire or current , i is current and L is length of the wire.

Magnetic field of 1.5 x 10⁻⁵ T is making an angle of 60 degree with the wire so the component of field perpendicular to it

B = 1.5 X 10⁻⁵ Cos 30° = 1.3 x 10⁻⁵ T.

Force = BiL

= 1.3 X 10⁻⁵ X .4 X 1

= 5.2 X 10⁻⁶ N.

The direction of force can be found out from Fleming's left hand rule . It will be along downward direction.

5 0

4 years ago

A woman fires a rifle with barrel length of 0.5400 m. Let (0, 0) be where the 125 g bullet begins to move, and the bullet travel

dybincka [34]

Answer:

Explanation:

Given that,

Length of barrel =0.54m

Mass of bullet=125g=0.125kg

Force extend

F=16,000+10,000x-26,000x²

a. Work done is given as

W= ∫Fdx

W= ∫(16,000+10,000x-26,000x² dx from x=0 to x=0.54m

W=16,000x+10,000x²/2 -26,000x³/3 from x=0 to x=0.54m

W=16,000x+5,000x²- 8666.667x³ from x=0 to x=0.54m

W= 16,000(0.54) + 5000(0.54²) - 8666.667(0.54³) +0+0-0

W=8640+1458-1364.69

W=8733.31J

The workdone by the gas on the bullet is 8733.31J

b. Work done is given as

Work done when the length=1.05m

W= ∫Fdx

W= ∫(16,000+10,000x-26,000x² dx from x=0 to x=1.05m

W=16,000x+10,000x²/2 -26,000x³/3 from x=0 to x=1.05m

W=16,000x+5,000x²- 8666.667x³ from x=0 to x=1.05mm

W= 16,000(1.05) + 5000(1.05²) - 8666.667(1.05³) +0+0-0

W=16800+5512.5-10032.75

W=12,279.75J

The workdone by the gas on the bullet is 12,279.75J

3 0

3 years ago

If the pressure of a gas is increased, then the volume will decre

pogonyaev

Answer:

The answer is b

Explanation:

8 0

3 years ago

Wind instruments like trumpets and saxophones work on the same principle as the "tube closed on one end" that we examined in our

Gnom [1K]

Answer:

f = v / 4L

the frequency of the instruments is reduced by the decrease in the speed of the wave with the temperature.

Explanation:

In wind instruments the wave speed must meet

v = λ f

λ = v / f

from v is the speed of sound that depends on the temperature

v = v₀ $\sqrt{1+ \frac{T [C]}{273} }$

where I saw the speed of sound at 0ºC v₀ = 331 m/s the temperature is in degrees centigrade, we can take the degrees Fahrenheit to centigrade with the relation

(F -32) 5/9 = C

76ºF = 24.4ºC

45ºF = 7.2ºC

With this relationship we can see that the speed of sound is significantly reduced when leaving the house to the outside

at T₁ = 24ºC v₁ = 342.9 m / s

at T₂ = 7ºC v₂ = 339.7 m / s

To satisfy this speed the wavelength of the sound must be reduced, so the resonant frequencies change

λ / 4 = L

λ= 4L

v / f = 4L

f = v / 4L

Therefore, the frequency of the instruments is reduced by the decrease in the speed of the wave with the temperature.

3 0

3 years ago

Explain the concept behind the multiverse. 2. what did astronomer edwin hubble discover in 1929? 3. explain what the two teams o

lozanna [386]

PART A)
1) The Multiverse is a system of multiple parallel Universes, in which our Universe is only one of the possible configurations.

2) Hubble in 1929 discovered, looking at distant galaxies, that they are moving away from us with a speed greater than expected as if they are on a moving pavement. This led to the idea of expanding Universe.

3) In the 1990s it was discovered that the Universe is expanding not at a decelerating rate, but, on the contrary, at an accelerating rate. The question that arose is: what is accelerating the expansion of the Universe?

4) The amount of dark energy that is making the Universe expansion to accelerate, also know as repulsive gravity, that is needed to explain what we see, is very small, therefore it must come out from laws of physics, but no one has yet found how. Although this amount is so small to be called a detail, Greene thinks it is important because it could prove the existence of other Universes.

5) The idea behind the string theory is that every sub-atomic particle is made of tiny vibrating strings and the way they vibrate determines what kind of particle is created. In order to make this theory to work, we need to allow the possibility of dimensions other than the four (3 of space + 1 of time) we experience every day.

6) Greene says that the Big Bang was fueled by an explosion, called inflation. Since this fuel is very efficient, it could have powered not only our Universe but also other parallel Universes, with different characteristics from ours. A forever expanding Universe will lead to galaxies so far away from each other not to be visible anymore because the light departing from them could not reach us anymore. Therefore in the future, the sky could be totally black, and future astronomers could believe that the Universe is nothing else than the planet they live in.

PART B)
1) The problem of living in our Universe is that we can only see it from inside and we cannot have the big picture of how things work, we can only see things that are inside our observational limits.

2) A flat geometry means that if you draw a triangle the sum of the angles is always 180°, exactly like in the Euclidean plane. Also, <span>that two parallel lines remain parallel forever, therefore light travels in a straight line.</span>

3) Gravity is an attractive force, therefore a galaxy can be redirected from its original direction when passing close to another galaxy. In some cases, the two galaxies start rotating around each other and at the end they merge, forming a new galaxy.

8 0

3 years ago

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