You really have a thing for screaming outside. So on a day where the speed of sound is 343 m/s you go outside and scream at a wall. It takes 0.5 s for you to hear your echo. How far away is the wall that you screamed at?

Answer:

468.42N

Explanation:

Here,

Work done(W)=1780J

Displacement(s)=3.8m

As we have,

Work=Force×displacement

Now,

[tex]\hookrightarrow 1780J=F\times3.8m\\\\\hookrightarrow \frac{1780J}{3.8m} =F\\\\\hookrightarrow F=468.42N[/tex]

The acceleration of the center of mass of the blocks-string-pulley system has magnitude equal to the ratio of difference to the sum of masses of block multiplied with gravitational acceleration.

The center of mass of a object or for a system of object is the point, where the center of distribution of mass in space. The center of mass for the two bodies can be given as,

It can be given as,

[tex]x_{cm}=\dfrac{m_1x_1+m_2x_2}{m_1+m_2}[/tex]

Here, (m) represents the mass and (x) represents the distance.

The acceleration of the center of mass of the blocks-string-pulley system has magnitude of a_cm has to be find out.

The image of the blocks-string-pulley system is attached below. The acceleration of this system is,

[tex]\vec a_{cm}=\left(\dfrac{m_1-m_2}{m_1+m_2}\right)g[/tex]

Thus, the acceleration of the center of mass of the blocks-string-pulley system has magnitude equal to the ratio of difference to the sum of masses of block multiplied with gravitational acceleration.

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Answer:

mechanical

Explanation:

Thermal stress is a type of mechanical weathering. This occurs due to  breakdown of rocks which takes place via expansion and/or contraction induced by heating and/or cooling.

Due to concentration difference, electric charge flows from a region of high electric potential to a region of low electric potential.

Electric charge flows from a region of high electric potential to a region of low electric potential because of concentration difference. This movement is same as the diffusion in which molecules move from high concentration to lower concentration.

So we can conclude that due to concentration difference, electric charge flows from a region of high electric potential to a region of low electric potential.

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Answer:

.60 A

Explanation:

The RMS (Root Mean Square) voltage (the effective voltage) of the  PEAK voltage  is  .7 * peak

.7 * 425 = 297.5 v

Now,   V = IR        re-arranged   to   V/R = I

                                                         297.5 v  /  500 ohm = .595 A = ~ .6 A

Answer:

mb

Explanation:

m b

Answer:

8 V

Explanation:

Equivalent R

Finding Current

Finding V

The universe is the collection of galaxies, The Andromeda Galaxy has spectral lines with blue shift. The conclusion is that the Universe has stopped expanding.

The Andromeda Galaxy is the nearest spiral neighbor that has spectral lines showing a blue shift.

Therefore, this concludes that, the Universe has stopped expanding. This galaxy is slowly shifting towards us.

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The available energy ea when the proton and the antiproton have equal energies of 450gev is 29 GeV.

The available energy can be found out with the following formula.

[tex]E_a=\sqrt{2E_tE_k++(m_1c^2)^2+(m_2c^2)^2}[/tex]

Here C is the speed of light (3×10⁸ m/s), Et is the energy of proton, Ek is the rest energy.

A proton and an antiproton have equal energies of 450gev. The particles collide head-on. The rest energy of the proton is 938mev

Thus, put the given values in the above formula,

[tex]E_a=\sqrt{2(450\times\dfrac{10^9eV}{1MeV})(938\times\dfrac{10^6eV}{1MeV})+(938\times\dfrac{10^6eV}{1MeV})^2+(938\times\dfrac{10^6eV}{1MeV})}\\E_a=29\rm\; Gev[/tex]

Thus, the available energy ea when the proton and the antiproton have equal energies of 450gev is 29 GeV.

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Answer:

1/3 kg

Explanation:

Concepts

The formula p = mv tells us that momentum is mass times velocity. We can easily rearrange this equation to solve for m by dividing both sides by v:

Application

We are asked to find the mass of a beach ball, given the velocity as 9 m/s and the momentum as 3 kg · m/s. We can use the formula m = v/p to find the mass of the ball in kilograms.

Solution

The minimum energy of the two oppositely directed gamma rays in a PET procedure is : 0.51 MeV

In a PET procedure when an electron and positron collide the energy equivalent of their individual masses are converted into gamma rays which will move in directions opposite to each other.

Given that an electron and a positron posses equal masses the minimum energy of the gamma ray will be 0.51MeV

Hence we can conclude that the minimum energy of the two oppositely directed gamma rays in a PET procedure is 0.51MeV.

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[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]

As we know, period (t)of a wave and it's frequency (f) are Reciprocal of each other, so if one is know then we can just reverse the order to get the other one.

that is :

[tex]\qquad \sf  \dashrightarrow \: frequency = \dfrac{1}{period} [/tex]

Now, let's move on to problems ~

# 11. f = 15 hertz, t = ?

[tex]\qquad \sf  \dashrightarrow \: t = \dfrac{1}{15} \: \: sec[/tex]

[tex]\qquad \sf  \dashrightarrow \: t \approx0.067 \: \: sec[/tex]

#12. f = 292 hertz, t = ?

[tex]\qquad \sf  \dashrightarrow \: t = \dfrac{1}{292} \: \: sec[/tex]

[tex]\qquad \sf  \dashrightarrow \: t \approx0.0034 \: \: sec[/tex]

#13. t = 12 seconds, f = ?

[tex]\qquad \sf  \dashrightarrow \: f= \dfrac{1}{12} \: \: hertz[/tex]

[tex]\qquad \sf  \dashrightarrow \: f \approx0.083 \: \: hertz[/tex]

We know that, frequency = reciprocal of the period of time an object swings or vibrates at. Therefore,

[tex]\tt\:FORMULA \downarrow\\\\\star\boxed{\mathfrak{Frequency = \frac{1}{period \: of \: time}}}[/tex]

Now, let's solve the questions by using this formula.

[tex]\rule{150pt}{2pt}[/tex]

11. Frequency = 15 Hz

Period = ?

[tex]\sf\:Frequency = \frac{1}{period}\\\sf\:15 = \frac{1}{period}\\\boxed{\bf\:period = \frac{1}{15} = 0.67 \: s}[/tex]

[tex]\rule{150pt}{2pt}[/tex]

12. Frequency = 292 Hz

Period = ?

[tex]\sf\:Frequency = \frac{1}{period}\\\sf\:292 = \frac{1}{period}\\\boxed{\bf\:period = \frac{1}{292} = 0.0034 \: s}[/tex]

[tex]\rule{150pt}{2pt}[/tex]

13. Period = 12 s

Frequency = ?

[tex]\sf\:Frequency = \frac{1}{period}\\\sf\:Frequency = \frac{1}{12}\\\boxed{\bf\:Frequency = 0.083 \: Hz}[/tex]

[tex]\rule{150pt}{2pt}[/tex]

The SI units of,

[tex]\rule{150pt}{2pt}[/tex]

Answer:

I think the object with 500 N of force applied.

The downward force on the 2. 67-cm piston that is required to lift a mass of 2000 kg supported by the 20-cm piston is 350 N.

Pressure applied to a closed system of fluid will be transfer at each point of the fluid and the boundaries of the system.

Let suppose at the two point of such system the input force apllied is F₁ and output force we get is F₂. The area of this points is A₁ and A₂ respectively. As the pressure at both point is same. Then by the pascal law,

[tex]\dfrac{F_1}{A_1}=\dfrac{F_2}{A_2}\\[/tex]

In case of radius,

[tex]\dfrac{F_1}{\pi r_1^2}=\dfrac{F_2}{\pi r_2^2}\\\\\dfrac{F_1}{r_1^2}=\dfrac{F_2}{ r_2^2}[/tex]

Two pistons of a hydraulic lift have radii of 2. 67 cm and 20. 0 cm, respectively. Thus,

[tex]r_1=2.67\rm\; cm[/tex]

[tex]r_2=20.0\rm\; cm[/tex]

The downward force on the 2. 67-cm piston that is required to lift a mass of 2000 kg supported by the 20-cm piston is The force applied on second piston is,

[tex]F_2=mg\\F_2=2000\times9.81\\F_2=19620 \rm\; N[/tex]

Put the values in the above formula,

[tex]\dfrac{F_1}{2.67^2}=\dfrac{19620}{20^2}\\F_1=\dfrac{19620\times2.67^2}{20^2}\\F_1\approx 350\rm\; N[/tex]

Thus, the downward force on the 2. 67-cm piston that is required to lift a mass of 2000 kg supported by the 20-cm piston is 350 N.

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The most effective insulating material is polystyrene.

The material which isolates the body and doesn't allow heat and mass to flow out of the control system.

The insulating material should have the lowest thermal conductivity.

Polystyrene foam has low thermal conductivity which makes it a great insulator to heat.

Aluminum foil can be an effective insulating material because it doesn't flow heat out into the environment.

Cotton wool is effective, but not it is not fire resistant.

Thus, the best effective insulating material is polystyrene.

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The energy of an electron in a rigid box when it is in the next higher  state is 19.6 eV

The energy carried by the electron when jumping from one energy level to another is called as electron energy.

Energy in the nth level for a rigid box of length L and mass of electron m is represented as

[tex]E_{n} = \dfrac{n^2{h^{2} } }{8mL^{2} }[/tex]

As the energy is proportional to n².

[tex]\dfrac{E_{n+1} }{E_{n} } =(\dfrac{n+1}{n} )^{2}[/tex]

Substitute the value 3 for n in the above equation. So, we have the energy of an electron is

E₄ =  19.6 eV

Thus, energy of electron in a rigid box when it is in the next higher state is 19.6 eV.

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The formulas used to analyze the horizontal and vertical motion of projectiles launched at an angle involve the use of tangent, cosine and sine.

The vertical motion of a projectile is affected by gravity and the velocity of vertical motion given by the following formula;

Vy = Vsinθ

The horizontal velocity of a projectile is given by the following formula;

Vx = Vcosθ

The direction of the motion is calculated as follows;

tanθ  = Vy/Vx

Thus, the formulas used to analyze the horizontal and vertical motion of projectiles launched at an angle involve the use of tangent, cosine and sine.

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Answer:

d

Explanation:

edg 2022

Answer:

frost wedging

Explanation:

When glaciers melt and the rock beneath is weathered and broken down, this is called frost wedging.

Answer: Stars are formed in dust clouds and are found in most galaxies.

Explanation:

Answer: Stars form inside relatively dense concentrations of interstellar gas and dust known as molecular clouds.

Explanation:

Motion is a change in position measured by distance and time.

The period of the pendulum of length 3. 171 m when acceleration of gravity is 9. 832 m/s, is 3.57 seconds.

Pendulum is the body which is pivoted to a point and perform back and forth motion around that point by swinging due to the influence of gravity.

The time period of a pendulum is the time taken by it to complete one cycle of swing left to right and right to left.

It can be given as,

[tex]T=2\pi \sqrt{\dfrac{L}{g}}[/tex]

Here, (g) is the gravitational force of Earth and (L) is the length of the pendulum.

A pendulum of length 3.171 m. The acceleration of gravity is 9.832 m/s2. The period at the north pole is,

[tex]T=2\pi \sqrt{\dfrac{3.171}{9.832}}\\T=3.57\rm\; s[/tex]

Thus, the period of the pendulum of length 3. 171 m when acceleration of gravity is 9. 832 m/s, is 3.57 seconds.

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Compared to the electric field energy density at b, the electric field energy density at a is large by a factor of 16.

The energy of a particle by virtue of its position.

The potential at B = Vb =V

Vb = 1/4π∈₀ x e/r₁ = ke/r₁

V =ke/r₁

and r₁ = ke /V

The potential at A = Va = 2V

2V = ke/r₂

r₂ = ke/2V

The electric field at point B. Eb = ke/r₁²

Substitute the value of r₁, we get

Eb = V²/ke

The electric field at point A , Ea = ke /r₂²

Substitute the value of r₂, we get

Ea = 4V²/ke

The electric field energy density at point A and B,

Ua  = 1/2 ∈Ea²

Ub = 1/2 ∈Eb²

electric field energy density is proportional to the square of electric field at the particular point.

Ua/Ub =(Ea/Eb)²

Substitute the values, we get

Ua/Ub = 16

Thus, compared to the electric field energy density at b, the electric field energy density at a is large by a factor of 16.

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Answer:

51°

Explanation:

dark fringe equation = dsinθ = (m + 1/2)λ

sinθ = [(m + 1/2)λ]d

sinθ1 = [(m + 1/2)λ]d

sinθ1/sinθ =  [(m + 1/2)(λ/d)] / [[(m + 1/2)(λ/d)] = [(m + 1/2)] / [(m + 1/2)]

sinθ1 = [(m + 1/2)] / [(m + 1/2)] (sinθ)

sinθ1 = [1+1/2]/[0+1/2] (sin15)

sinθ1 = 3sin15

sinθ1 = 0.77645

θ1 = sin^-1( 0.77645)

θ1 = 50.94° = 51°

The dark fringe for m = 0 in a young's double-slit experiment is located at an angle. The angle that locates the dark fringe for m = 1 is  51°.

When light passes through a slit , it produces a spectrum which can be seen on the screen kept a distance in form of fringes of different intensity. The fringe with intensity zero is called the dark fringe.

Given is the angle θ = 15°

The equation for the dark fringe is

d sinθ = (m + 1/2)λ

For m= 0 and m=1, the ratio of the sines  is

sinθ₁/sinθ₀ = [(m + 1/2)] / [(m + 1/2)]

Rearranging for sinθ₁, we have

sinθ₁ = [(m + 1/2)] / [(m + 1/2)] (sinθ₀)

Substituting the values into the equation and solving for θ₁

sinθ₁ = [1+1/2]/[0+1/2] (sin15)

θ₁ = 51°

Thus, the angle that locates the dark fringe fro m = 1 is 51°.

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Answer:

b 1000

if you multiply 2m/s by 500 you get 1000 it should look like this.

500 x 2m/s

Answer:

More Than 1.3 million.

Hope it helps :))

Answer: The air is full of water, as water vapor, even if you can't see it. Condensation is the process of water vapor turning back into liquid water, with the best example being those big, fluffy clouds floating over your head. And when the water droplets in clouds combine, they become heavy enough to form raindrops to rain down onto your head.

Explanation:

Answer:

if it were submerged 1000 m in the ocean it would be crushed because of the differences of the air and water pressure.

If it were taken 10,000 m (higher than Mt Everest) it would explode due to the differences of external and internal air pressures.

Answer:

4 m/s

Explanation:

you moved 140 meters in 35 seconds

v = 140 / 35 = 4 m/s

formula

weight= mass×gravity

weight=80×10=800

Resistance for 165 metres is 3 ohms.