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Answer question 3 please!!!

Answer:

[tex]\lambda=4L=1.33m[/tex]

v=343m/s

Explanation:

We have to take into account the expressions

[tex]f=\frac{2n+1}{4}\frac{v_s}{L}\\L=(2n+1)\frac{\lambda}{4}[/tex]

if we assume that 256Hz is the fundamental frequency we have

[tex]f=\frac{1}{4}\frac{v_s}{L}\\\\L=\frac{1}{4}\frac{v_s}{f}=\frac{1}{4}\frac{343\frac{m}{s}}{256Hz}=0.33m[/tex]

and for wavelength

[tex]\lambda=4L=1.33m[/tex]

hope this helps!!

Answer:

a) The wavelength, λ = 1.352 m

b) The speed of the sound in the column air is v = 346.112 m/s

Explanation:

a) Frequency, f = 256 Hz

The water level is lowered by 676 mm. i.e. x = 676 * 10⁻³ m

The length, x, at which the loudest sound will be heard is λ/2

i.e. x =  λ/2

Therefore the wavelength of the 256 Hz sound waves in the column air is given by the relation

λ = 2x

λ = 2 * 676 * 10⁻³

λ = 1.352 m

b) The speed of the sound in the column air:

The speed, v, is given by the relation   v = f  λ

speed, v = 256 * 1.352

v = 346.112 m/s

Answer:

a. 340.13 m/s b. 680.26 m/s c. our wavelength doubles

Explanation:

a. speed of wave, v = fλ were f = frequency = 301 Hz and λ = wavelength = 1.13 m.

v = fλ = 301 Hz × 1.13 m = 340.13 m/s

b. If we double the frequency then f = 2 × 301 Hz = 602 Hz

v = fλ = 602 Hz × 1.13 m = 680.26 m/s

c. If the speed of the wave is still 340.13 m/s, if we cut the frequency in half, then frequency now equals f = 301 Hz/2 = 150.5 Hz.

Since v = fλ,

λ = v/f = 340.13 m/s ÷ 150.5 Hz = 2.26 m.

Since our initial wavelength λ₀ = 1.13 m,

λ/λ₀ = 2.26 m/1.13 m = 2.

So, λ = 2λ₀ our wavelength doubles

Answer:

Nuclear plants are plants that involve the fission of relatively large atoms to produce electricity as its final product.

In nuclear power plants, the nuclear energy is converted to heat energy, after which the heat energy is converted to mechanical( rotational energy) which helps in the spinning of the turbines. The mechanical energy is then converted to electrical energy.

Answer:

D

Explanation:

It cannot be determined because the masses of the puck and stick are unknown.



Answer:

the answer is D

Explanation:

It cannot be determined because the masses of the puck and stick are unknown.

Answer:

The answer to your question is height = 9.20 m

Explanation:

Data

Work = 587 kJ

mass of the body = 6500 kg

height = ?

Mechanic work is defined as the force applied to a body times its mass.

Process

1.- Calculate the weight of the body

weight = mass x gravity (9.81)

weight = 6500 x 9.81

            = 63765 N

2.- Calculate the height

height = work / weight

-Substitution

height = 587 000 / 63765

-Result

height = 9.20 m

The upward force exerted on an object falling through air is air resistance. The correct option is C.

When an object moves through air, it creates a force called air resistance. This force basically acts in the inverse way of direction of a body moving via air.

The frictional force of air resistance acts on the moving body. When a body moves, air resistance slows it down.

When an object moves through the air, it encounters air resistance. Resistance varies depending on the velocity, shape, and area of the object. The higher the air resistance, the faster an object moves and the larger its area.

When air pushes against a moving object, it creates air resistance force. Frictional forces include air resistance. Force is always applied against the motion of an object.

Thus, the correct option is C.

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Explanation:

Initially, two balls of the same shape and size have charges of +8 and-2. The balls are brought together, allowed to touch, and then separated.

When they are touched, the total charge is evenly distributed among the whole surface and they behaves as if it is a single piece. Net charge at this point is +8-2=6 C. When they are separated, each ball will have a charge of 6/2 = 3 C.

When two identical balls with charges of +8 and -2 are brought into contact and then separated, each ball ends up with a net charge of +3, due to the conservation of charge and even distribution across identical conducting surfaces.

When two balls of the same shape and size with charges of +8 and -2 are brought together, allowed to touch, and then separated, the net charge on each ball is a result of the equal distribution of the total charge across both balls. Initially, the total charge is the sum of +8 and -2, which equals +6. Since the balls are identical and they come into contact, this total charge of +6 is evenly divided between them. Therefore, after they are separated, each ball will have a net charge of +3.

This occurs because, when conducting objects touch, charges redistribute themselves evenly across the surfaces of the objects until they reach an equilibrium while maintaining the conservation of charge. In simpler terms, the total quantity of charge is conserved, and since the two balls are identical, the charge divides evenly.

Answer:

P(A∪B)=0.8

Explanation:

Given that,

A and B are mutually exclusive events such that,

P(A)=0.5 and P(B)=0.3

We need to find P(A or B). It means we need to find P(A∪B). If two events are mutually exclusive, P(A∩B)=0. So,

P(A∪B)=P(A)+P(B)-P(A∩B)

Putting P(A) and P(B), we get :

P(A∪B)=0.5+0.3-0

P(A∪B)=0.8

So, the value of P(A or B) is 0.8

Answer: B. Both involve the use of levers.

Explanation:

Answer:

t² ∝ r³

Explanation:

Let m be the mass of the sun and m₁ be the mass of the planet and r its distance from the sun. Its gravitational force of attraction equals its centripetal force. So,

Gmm₁/r² = m₁rω² = m₁r(2π/t)²  were t is the period of orbit of the planet

Gm/r² = 4π²r/t²

rearranging we ave

t² = (4π²/Gm)r³   since k = 4π²/Gm = constant

t² = kr³ and

t² ∝ r³

Answer:

opposite the sun. between the Earth and the sun. rising perpendicular to the sun.

Explanation:

Answer:

As a result, sound waves travel faster in solids than in liquids, and faster in liquids than in gasses. While the density of a medium also affects the speed of sound, the elastic properties have a greater influence on the wave speed. The density of a medium is the second factor that affects the speed of sound. ( sorry its a bit long :b)

Explanation:

Answer: True

Explanation:

A photo detector that can respond to the entire rang of visible light can be design, it is true.

Photo detector is a device in an optical receiver which receives optical signals and convert it to electric signal. It is the key device position in front of the optical receiver.

The direction of the magnetic field at a point in an electromagnetic wave can be determined using the 'right-hand rule'. Point your thumb in the direction of the electric field and curl your fingers. The direction your fingers curl is the direction of the magnetic field.

In physics, particularly electromagnetic theory, the electric and magnetic fields of an electromagnetic wave are always perpendicular to each other and to the direction of propagation. The direction of the magnetic field at point 'a' can be determined by using the 'right-hand rule'. This rule states that if you point your thumb in the direction of the electric field and curl your fingers, the direction your fingers curl is the direction of the magnetic field. So, the direction of the magnetic field at point 'a' would be in the direction your fingers curl when you point your thumb in the direction of the electric field at point 'a'.

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Answer:

D: X: Low potential energy

    Y: High potential energy

    Z: Flow of electrons

Explanation: trust

Answer:

d

Explanation:

The answer for the following problem is mentioned below.

Explanation:

Frequency:

The number of waves that pass a fixed place in a given amount of time. (or)

The number of waves that pas by per second.

The SI unit of the frequency is Hertz(Hz).

Time period:

The time taken for one complete cycle of vibration to pass a given point.

The SI unit of time period is seconds. (s)

Given:

Frequency (f) = 39.5 Hz

To calculate:

Time period (T)

We know;

According to the problem;

From the problem;

f = [tex]\frac{1}{T}[/tex]

Where;

f represents the frequency

T represents the time period

 f = [tex]\frac{1}{39.5}[/tex]

 f = 0.02 seconds

Therefore the time period is 0.02 seconds.

Given values,

Frequency,

Now,

→ [tex]Frequency = \frac{1}{Time \ period}[/tex]

or,

→             [tex]F = \frac{1}{t}[/tex]

By substituting the values,

            [tex]39.5 = \frac{1}{t}[/tex]

                [tex]t = \frac{1}{39.5}[/tex]

                  [tex]= 0.02 \ seconds[/tex]

Thus the answer above is correct.    

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Answer:

[tex]F = 22298.824\,N[/tex]

Explanation:

According to the Principle of Energy Conservation and the Work-Energy Theorem, the bullet has the following expression:

[tex]U_{g,A} + K_{A} = U_{g,B} + K_{B} + W_{loss}[/tex]

[tex]W_{loss} = U_{g,A}-U_{g,B} + K_{A}-K_{B}[/tex]

[tex]F\cdot \Delta s = \frac{1}{2}\cdot m \cdot [v_{A}^{2}-v_{B}^{2}][/tex]

The average force exerted on the bullet to stop it is:

[tex]F = \frac{m\cdot [v_{A}^{2}-v_{B}^{2}]}{2\cdot \Delta s}[/tex]

[tex]F = \frac{(7.8\times 10^{-3}\,kg)\cdot [(540\,\frac{m}{s} )^{2}-(0\,\frac{m}{s} )^{2}]}{2\cdot (0.051\,m)}[/tex]

[tex]F = 22298.824\,N[/tex]

Answer:

22298.82N

Explanation:

The bullet has a kinetic energy: ½*m*v²

mass of bullet = 7.80g = 7.80÷1000 = 0.0078kg

distance in meter =5.10cm = 5.10÷100 = 0.051meter

K.e = 0.5 ×0.0078 × 540× 540

K.e = 1137.24 J

When the bullet stops this energy goes to zero, as the energy must be conserved the work done by the head of the superhero must be equal to the original energy of the bullet:

W= K

Considering an average constant force, the work can be calculated as:

W=F*d=K

Solving for F:

F = K/d

1137.24 J/ 0.051m

= 22298.82N

Answer:

The final temperature is 16°C

Explanation:

mcΔT (water) = mcΔT (zinc)

0.50(4184)(t-15) = 0.040(388)(115-t)

2092(t-15) = 15.52(115-t)

2092t-31380 = 1784.8-15.52t

2029t+15.52t= 1784.8+31380

2044.52t = 33164.8

t = 33164.8/2044.52

t = 16

Complete question:

If a system absorbs 300.5J of heat and performs 1.50kJ of work on the surroundings, what is the change in internal energy of the system ΔE?

Answer:

Change in internal energy of the system is 1800.5 J

Explanation:

Given:

heat transferred to the system, Q = 300.5J

work done on the surroundings, W = 1.50kJ

Change in internal energy of the system ΔE, can be calculated by applying thermodynamic equation of change in internal energy, work done and heat transferred.

ΔE = Q  + W

Where;

ΔE is change in internal energy

Q is heat transfer

W is work done

ΔE = 300.5 J  +  1500 J

ΔE = 1800.5 J

Therefore, change in internal energy of the system is 1800.5 J

Answer:

The intern energy of the system is -1199.5 J

Explanation:

Given:

System absorbs 300.5 J of heat

Performs 1.5 kJ = 1500 J of work on the surroundings

Question: What is the ΔE?

When a system absorbs heat, it will have a positive sign, therefore +300.5 J

When the system performs work on the surroundings, its sign will be negative, therefore, -1500 J

According the first law of thermodinamic:

ΔE = q + W = 300.5 - 1500 = -1199.5 J

Answer:

I₂ = I₀  1/4

Explanation:

For this exercise we use the definition of intensity which is the power per unit area

         I = P / A

The emitted power is constant, so

     P = I A

We can write this equation for the start and end point with index 2

    I₀ A₀ = I₂ A₂

    I₂ = I₀ A₀ / A₂

The spot area is the area of ​​the circle

      A₀ = π r₀²

We substitute

     I₂ = I₀ r₀² / r₂²

It indicates that the radius of the spot is twice the initial radius

      r₂ = 2 r₀

      I₂ = I₀ (r₀ / 2 r₀)²

      I₂ = I₀  1/4

Answer:

The law of inertia relates to revolution of planets round the sun due to constant motion of the planets round the sun.

Explanation:

Law of inertia states that a body at rest or uniform motion will continue to be at rest or uniform motion unless it is acted upon by an external force.

The gravitational force keeps the planets revolving round the sun in a uniform motion, this will continue till infinity unless equal and opposite force acts on our planets.

Therefore, the law of inertia relates to revolution of planets round the sun due to constant motion of the planets round the sun.

Answer:

1.25

Explanation:

From refractive index of the substance in the tub, n = sini/sinr where i = angle of incidence = 28° and r = angle of refraction = 22°

So, n = sini/sinr = sin28°/sin22° = 1.253 ≅ 1.25

The index of refraction of the substance in this tub is equal to 1.25.

Given the following data:

Snell's law gives the relationship between the angle of incidence and angle of refraction with respect to light or other waves passing through a media or two different substances such as glass, water or air.

Snell's Law states that the when light travels from one medium to another, it generally refracts. Mathematically, it is given by this formula:

[tex]n=\frac{sini}{sinr}[/tex]

Substituting the given parameters into the formula, we have;

[tex]n=\frac{sin28}{sin22}\\\\n=\frac{0.4695}{0.3746}[/tex]

n = 1.25

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Answer:

Explanation:

The question relates to motion on a circular path .

Let the radius of the circular path be R .

The centripetal force for circular motion is provided by frictional force

frictional force is equal to μmg , where μ is coefficient of friction and mg is weight

Equating cenrtipetal force and frictionl force in the case of car A

mv² / R = μmg

R = v² /μg

= 26.8 x 26.8 / .335 x 9.8

= 218.77 m

In case of moton of car B

mv² / R = μmg

v²  = μRg

= .683  x 218.77x 9.8

= 1464.35

v = 38.26 m /s .

Answer:

Fd

Explanation:

Work is force times distance. If you push on an object really hard but it does not budge, you have still performed no work on it, because anything times zero is still zero.

Answer:

W = F * d

Explanation:

Answer:

Frequency of gamma rays is more than microwave.                

Explanation:

The number of vibrations per unit time is called frequency of a wave. The SI unit of frequency is Hertz. It is equal to [tex]s^{-1}[/tex].

The frequency of gamma rays is of the order of [tex]10^{20}\ Hz[/tex]. The frequency of microwave is of the order of [tex]10^8\ Hz[/tex].

It is clear that gamma rays have more frequency that of the microwave.

Answer:

it can change the speed only or can change direction only or can change both

Answer:

Explanation:

We have that for the Question "Imagine two circular plates; one is solid and the other has a hole cut out of the center. Both plates have the same radius, same thickness, and same mass. The same force F is applied tangential to the edge of each plate in such a way that the plates rotate about an axis passing through the center and perpendicular to the surface of the plates."

Question: Which one of the following statements is true regarding the angular acceleration?

Answer : The solid plate will have the greater angular acceleration

Question : Which of the following statements helps to explain the question asked above? (Select all that apply.)

Answer :

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Answer:

[tex]v_{1f} = 90.12m/s[/tex]

Explanation:

As we know that Probe along with rocket system is an isolated system

So here net force on this system must be zero

and we can use momentum conservation for this system

So we will have

[tex](m_1 + m_2)v_{i} = m_1v_{1f} + m_2v_{2f}[/tex]

here we know that

[tex]7310 \times 88.3 = (7310- 54)v_{1f} + 54(v_{1f} - 246)[/tex]

[tex]645473 = 7310\times v_{1f} - 13284\\658757 = 7310 \times v_{1f}[/tex]

so we have,

[tex]v_{1f} = 90.12m/s[/tex]

Answer:

Final velocity of Probe; V_f = 656.314 m/s

Explanation:

We are given;

Mass of space probe; m_i = 7310 kg

Initial velocity of probe ; v_i = 88.3 m/s

Mass of exhaust fuel; m = 54 kg

V_rel = 246 m/s

Mass of fuel; m_f = m_i - m = 7310 kg - 54kg = 7256 kg

From Rocket equation;

V_f - V_i = V_rel[In(m_i/m_f)]

Where V_f is final velocity of probe.

Thus, plugging in the relevant values to get ;

V_f - 88.3 = 246[In(7310/7256)]

V_f - 88.3 = 246 x 2.309

V_f - 88.3 = 568.014

Thus, V_f = 568.014 + 88.3 = 656.314 m/s

Answer:

The strength of the magnetic field is 0.08 mT

Explanation:

Given:

Length of rod [tex]l = 1.05[/tex] m

Velocity of rod [tex]v = 3.27[/tex] [tex]\frac{m}{s}[/tex]

Induced emf [tex]\epsilon = 0.275 \times 10^{-3}[/tex] V

According to the faraday's law

We know that the induced emf of rod is given by,

   [tex]\epsilon = Blv[/tex]

Where [tex]B =[/tex] magnetic field

For finding the magnetic field,

   [tex]B = \frac{\epsilon }{lv}[/tex]

   [tex]B = \frac{0.275 \times 10^{-3} }{1.05 \times 3.27}[/tex]

   [tex]B = 0.08 \times 10^{-3}[/tex]

   [tex]B = 0.08[/tex] mT

Therefore, the strength of the magnetic field is 0.08 mT