anomalous expansion of water
​

Answer:

i҈ d҈o҈n҈t҈ k҈n҈o҈w҈ w҈h҈a҈t҈ y҈o҈u҈r҈ s҈a҈y҈i҈n҈v҈ b҈c҈h҈

Answer:

[tex]m^{3}kg^{-1} s^{-2}[/tex]

Explanation:

Answer:

D

Explanation:

Coulomb's law states that the electrical force between two charged objects is directly proportional to the product of the quantity of charge on the objects and inversely proportional to the square of the separation distance between the two objects.

Answer:

9013 m/s

Explanation:

hope it helped!!!

Answer:  

Newton's second law of motion describes the relationship between force and acceleration. They are directly proportional. If you increase the force applied to an object, the acceleration of that object increases by the same factor. In short, force equals mass times acceleration.

Explanation:

Answer:

E = 420.9 N/C

Explanation:

According to the given condition:

[tex]Net\ Force = 2(Magnetic\ Force)\\Electric\ Force - Magnetic\ Force = 2(Magnetic\ Force)\\Electric\ Force = 3(Magnetic\ Force)\\qE = 3qvBSin\theta\\E = 3vBSin\theta[/tex]

where,

E = Magnitude of Electric Field = ?

v = speed of charge = 230 m/s

B = Magnitude of Magnetic Field = 0.61 T

θ = Angle between speed and magnetic field = 90°

Therefore,

[tex]E = (3)(230\ m/s)(0.61\ T)Sin90^o[/tex]

E = 420.9 N/C

Answer:

C. Remains of living things

Explanation:

They are made up of dead animals or plants. Coal, Oil, and Natural Gas are the three types of fossil fuels and all of them come from dead organisms. Even the name Fossil Fuels, sounds like a name for something like this.

Hope this Helps ʕ•ᴥ•ʔ

Answer:

C

Explanation:

took the test

Answer:

the bus can travel 24.54 km before the flywheel has to be spun up to speed again

Explanation:

 Given the data in the question;

mass of wheel m = 1600 kg

radius of the fly wheel r = 0.650 m

angular speed of the wheel ω = 4000 rev/min = 418.879 rad/s

Average speed of the bus v = 40 km/h =  11.1111 m/s

Power p = 18 hp = 13428 watt

So moment of inertia of the fly wheel is;

[tex]I[/tex] = [tex]\frac{1}{2}[/tex]mr²

we substitute

[tex]I[/tex] = [tex]\frac{1}{2}[/tex] × 1600 kg × (0.650 m)²

[tex]I[/tex] = 338 kgm²

So, the rotational energy of the bus will be;

[tex]E_r[/tex] = [tex]\frac{1}{2}[/tex][tex]I[/tex]ω²

we substitute

[tex]E_r[/tex] = [tex]\frac{1}{2}[/tex] × 338 kgm²  × ( 418.879 rad/s )

[tex]E_r[/tex] = 29652675.212329 J

relation of power to energy

P = E / t

but we know that time t = distance / velocity

t = d/v

∴

P = E / ( d/v)

we solve for distance (d)

P = Ev / d

Pd = Ev

d = Ev / P

so we substitute

d = [( 29652675.212329 J )( 11.1111 m/s )] / [ 13428 W ]

d = 24536.33 m

d = 24.54 km

Therefore, the bus can travel 24.54 km before the flywheel has to be spun up to speed again

Answer:

N = 25795 loops

Explanation:

The magnetic field of a solenoid can be calculated by using the following formula:

[tex]B = \frac{\mu NI}{L}\\N = \frac{BL}{\mu I}[/tex]

where,

N = No. of loops = ?

B = Magnetic Field = 0.78 T

L = Length of solenoid = 32 cm = 0.32 m

I = Current = 7.7 A

μ = permeability of free space = 4π x 10⁻⁷ N/A²

Therefore,

[tex]N = \frac{(0.78\ T)(0.32\ m)}{(4\pi\ x\ 10^{-7}\ N/A^2)(7.7\ A)}\\[/tex]

N = 25795 loops

Answer:

Explanation:

The IV is the dose given and the DV is the intensity and frequency of symptoms. The intensity and frequency of symptoms “depends” on the dose of drug given. Example 4: You are studying how tutoring affects SAT scores. Your independent variable(IV) is tutoring and the dependent variable(DV) is test scores.

Answer:

the answer is B from negative pole to positive pole

Answer:

can y

Explanation:

jj

The smallest particles that can be removed by these clarifiers have a diameter of 0.0257 mm, and the minimum width of a rectangular clarifier with a length-to-width ratio of 5:1 is 0.023 times the length.

The equation for the settling velocity of a particle:

V_s = (2/9) * (ρ_p - ρ_w) * g * r^2 / η

where V_s is the settling velocity, ρ_p is the particle density, ρ_w is the water density, g is the acceleration due to gravity, r is the particle radius, and η is the water viscosity.

1. We can rearrange the equation to solve for the particle radius:

r = [9ηV_s / (2(ρ_p - ρ_w)g)]^(1/2)

We want to find the particle diameter, which is twice the radius, so we can substitute 2r for d in the following equation:

d = 2r = 2[9ηV_s / (2(ρ_p - ρ_w)g)]^(1/2)

To remove the smallest particles, we want to use the smallest settling velocity possible, which corresponds to a particle just barely settling to the bottom of the clarifier. Therefore, we can set V_s equal to the minimum settling velocity required for particles to be removed:

V_s = Q / (A * X)

where Q is the flow rate (25 MGD), A is the surface area of one clarifier (πr^2), and X is the overflow rate, which is the flow rate per unit area of the clarifier. A typical overflow rate for a sedimentation basin is 600-1200 gallons per day per square foot (gpd/ft^2), or 2.5-5 m^3/day/m^2. We will use the lower end of this range, 2.5 m^3/day/m^2.

Substituting in the values for Q, A, and X, we get:

V_s = (25 MGD) / (π(8 m)^2 * 2.5 m^3/day/m^2) = 0.00159 m/s

Now we can substitute the values for η, ρ_p, ρ_w, g, and V_s into the equation for the particle diameter:

d = 2[9(1 g/(m*s))(0.00159 m/s) / (2(1200 kg/m^3 - 998.2 kg/m^3)(9.81 m/s^2))]^(1/2) = 0.0257 mm

So, the smallest particles that can be removed by these clarifiers have a diameter of approximately 0.0257 mm.

2. To find the minimum width of a rectangular clarifier with a length-to-width ratio of 5:1, we can use the same overflow rate and flow rate as before, and we can assume a depth of 3 m. The surface area of one clarifier must still be the same as before, so we can use the equation for the surface area of a rectangle:

A = L * W

where L is the length and W is the width.

Substituting in the values for Q, X, and A, we get:

W = (25 MGD) / (5 * 24 hr/day * 60 min/hr * 60 s/min * 2.5 m^3/day/m^2 * 5 * L)

Simplifying, we get:

W = 0.023 L

So, the minimum width of a rectangular clarifier with a length-to-width ratio of 5:1 is 0.023 times the length.

Therefore, The smallest particles that can be removed by these clarifiers have a diameter of 0.0257 mm, and a rectangular clarifier's minimum width is 0.023 times the length when the length-to-width ratio is 5:1.

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Answer:

13: (Im not sure sorry)

14: C

15: B

16: B

17: B

18: B

Answer:

C. Sleep Apnea

Explanation:

Sleep Apnea is when someone who snores and stops breathing while sleeping

Someone who snorts and stop breathing during sleep may be suffering from Sleep Apnea. Hence, option (c) is correct.

Breathing repeatedly stops and begins while you sleep, which is a frequent symptom of sleep apnea. Your body may not receive enough oxygen as a result.

There are two different forms of sleep apnea.

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Answer:

[tex]22.84\ \text{N}[/tex]

Explanation:

[tex]\rho[/tex] = Density = [tex]7800\ \text{kg/m}^3[/tex]

h = Length of rod = 95 cm

d = Diameter of rod = 2 cm

r = Radius = [tex]\dfrac{d}{2}=1\ \text{cm}[/tex]

g = Acceleration due to gravity = [tex]9.81\ \text{m/s}^2[/tex]

V = Volume of rod = [tex]\pi r^2h[/tex]

Mass is given by

[tex]m=V\rho[/tex]

Weight is given by

[tex]w=mg=V\rho g\\\Rightarrow w=\pi r^2h\rho g\\\Rightarrow w=\pi\times (1\times 10^{-2})^2\times (95\times 10^{-2})\times 7800\times 9.81\\\Rightarrow w=22.84\ \text{N}[/tex]

The weight of the rod is [tex]22.84\ \text{N}[/tex].

It needs fuse of size 3A to be operated

Answer: 10 A

Explanation: The 3a and 5 a will blow immediately which would not allow you to use the coffee machine

The 13 a is too high and might lead to damage to the coffee machine or a fire being started

10 A is perfect because its low enough that if their was a power surge it would be blown without damaging anything else and it is high enough to let the coffee machine work without any trouble

Answer:

T = 4 N

Explanation:

Given that,

Weight of a car, W = 80 N

We know that,

Weight = mg

80 = 10m

m = 8 kg

If the acceleration of the car is 0.5 m/s², then force becomes,

F = 8 × 0.5

F= 4 N

So, the required tension force is 4 N.

Answer:

dynamic equilibrium

Explanation:

Substances transition between the reactants and products at equal rates, meaning there is no net change. Reactants and products are formed at such a rate that the concentration of neither changes.

Answer;

gram

Explanation

Answer:

[tex]3 \times 10 {}^6[/tex]

Answer:

the period of the physical pendulum is 0.498 s

Explanation:

Given the data in the question;

[tex]T_{simple[/tex] = 0.61 s

we know that, the relationship between T and angular frequency is;

T = 2π/ω ---------- let this be equation 1

Also, the angular frequency of physical pendulum is;

ω = √(mgL / [tex]I[/tex] ) ------ let this equation 2

where m is mass of pendulum, L is distance between axis of rotation and the center of gravity of rod and [tex]I[/tex]  is moment of inertia of rod.

Now, moment of inertia of thin uniform rod D is;

[tex]I[/tex] = [tex]\frac{1}{3}[/tex]mD²

since we were not given the length of the rod but rather the period of the simple pendulum, lets combine this three equations.

we substitute equation 2 into equation 1

we have;

T = 2π/ω OR T = 2π/√(mgL/[tex]I[/tex]) OR T = 2π√([tex]I[/tex]/mgL)

so we can use [tex]I[/tex] = [tex]\frac{1}{3}[/tex]mD² for moment of inertia of the rod

Since center of gravity of the uniform rod lies at the center of rod

so that L =  [tex]\frac{1}{2}[/tex]D.

now, substituting these equations, the period becomes;

T = 2π/√([tex]I[/tex]/mgL) OR T = [tex]2\pi \sqrt{\frac{\frac{1}{3}mD^2 }{mg(\frac{1}{2})D } }[/tex] OR T = 2π√(2D/3g )  ----- equation 3

length of rod D is still unknown, so from equation 1 and 2 ( period of pendulum ),

we have;

ω[tex]_{simple[/tex] = 2π/[tex]T_{simple[/tex] OR  ω[tex]_{simple[/tex] = √(g/D) OR  ω[tex]_{simple[/tex] = 2π√( D/g )  

so we simple solve for D/g and insert into equation 3

so we have;

T = √(2/3) × [tex]T_{simple[/tex]

we substitute in value of [tex]T_{simple[/tex]

T = √(2/3) × 0.61 s

T = 0.498 s

Therefore, the period of the physical pendulum is 0.498 s

Answer:

6.726 m/s

Explanation:

Given that

Applied force, F = 870 N

Distance moves by the force, d = 1.3 cm = 0.013 m

Mass of the hand, m = 0.50 kg

From the given values, first thing is to find the work done by the force. Work done is given as

W = fd.

W = 870 * 0.013

W = 11.31 J

To find the velocity, next we use the formula for finding Kinetic Energy

K.E = 1/2mv²

Where K.E = 11.31

11.31 = 1/2 * 0.5 * v²

22.62 = 0.5v²

v² = 45.24

v = √45.24

v = 6.726 m/s

To break the board with a blow from the hand the speed of the hand will be [tex]v=6.726\ \frac{m}{s}[/tex]

Speed is defined as the distance traveled by any object with respect to the time.

Now it is given that

Applied force, F = 870 N

Distance moves by the force, d = 1.3 cm = 0.013 m

Mass of the hand, m = 0.50 kg

From the given values, first thing is to find the work done by the force. Work done is given as

[tex]W=F\times d[/tex]

[tex]W=870\times 0.013[/tex]

W = 11.31 J

To find the velocity, next we use the formula for finding Kinetic Energy

[tex]KE=\dfrac{1}{2}mv^2[/tex]

Where K.E = 11.31

[tex]11.31=\frac{1}2}\times 0.5\times v^2[/tex]

[tex]0.5v^2=22.62[/tex]

[tex]v^2=45.24[/tex]

[tex]v=6.726\ \ \frac{m}{s}[/tex]

Hence to break the board with a blow from the hand the speed of the hand will be [tex]v=6.726\ \frac{m}{s}[/tex]

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Answer:

The limitations of sending information using electromagnetic waves is that when the electromagnetic waves move outward in all directions, wave transmitters need to be focused to transmit their signals to a single specified location.

Answer:

pls check

https://www.doubtnut.com/question-answer-physics/the-amplitude-of-a-simple-harmonic-oscillation-is-doubled-how-does-this-affect-i-periodic-time-ii-ma-12009541

Answer:

Part 1:

Option B is correct (It will remain unchanged).

Part 2:

Option C is correct (It will increase by a factor of √ 2)

Part 3:

Option E is correct (It will be half as fast/long.)

Part 4:

Option C is correct (It will increase by a factor of √ 2.)

Explanation:

Formula we are going to use:

V=f*λ

Where:

V is the speed of Sound

f is the frequency of wave

λ is the wavelength.

The speed of wave , tension and linear density have following relation:

[tex]V=\sqrt{F/\rho}[/tex]

Where:

V is the speed of Sound (Initial)

F is the tension in string (Initial)

[tex]\rho[/tex] is the linear density of string (Constant)

Terms:

V' is the new speed

f' is the new frequency

λ' is the wavelength

Solution:

Part 1:

From [tex]V=\sqrt{F/\rho}[/tex]:

Speed of Sound is independent of the frequency of shaking so speed well remain unchanged.

Option B is correct (It will remain unchanged)

Part 2:

If F'=2F then

[tex]V=\sqrt{F/\rho}[/tex]

[tex]V'=\sqrt{F'/\rho}\\V'=\sqrt{2F/\rho}\\V'= \sqrt{2} * \sqrt{F/\rho}\\V'=\sqrt{2}V[/tex]

Option C is correct (It will increase by a factor of √ 2)

Part 3:

Formula we are going to use:

V=f*λ

Given f'=2f,

Even though frequency is doubled we will keep velocities same. V=V' in order to find the changing wavelength.

V'=f'*λ'

f*λ=f'*λ'

f*λ=2f*λ'

Solving above Equation:

λ'=λ/2

Option E is correct (It will be half as fast/long.)

Part 4:

T'=2T means [tex]V'=\sqrt{2}V[/tex] (From Part 1)

f'=f

Now:

V'=f'*λ'

[tex]\sqrt{2}f*\lambda=f'*\lambda '\\\sqrt{2}f*\lambda=f*\lambda '\\ \lambda '=\sqrt{2}*\lambda[/tex]

Option C is correct (It will increase by a factor of √ 2.)

Answer:

t = 0.4 seconds

Explanation:

Given that,

Mass of the object, m = 2 kg

Initial speed of the object, u = 3 m/s

Finally, it stops, v = 0

Constant force applied to the object, F = 15 N

We know that,

Force, F = ma

[tex]F=\dfrac{m(v-u)}{t}\\\\t=\dfrac{m(v-u)}{F}\\\\t=\dfrac{2\times (0-3)}{15}\\\\=0.4\ s[/tex]

So, it will take 0.4 seconds to stop the mass.

Answer:

The tempature changes, and the envronment chnages because of this, therefore making tempature changes in a graph.

Explanation:

sorry if this isnt good

Temperature variations in a graph occur as a result of changing environmental conditions and changing temperature.  

Temperature is a physical quantity which measures hotness and coldness of a body. Temperature measures the degree of vibration of molecule in a body. Temperature is measured in centigrade (°C), Fahrenheit (°F) and Kelvin (K) in which Kelvin (K) is a SI unit of temperature. Absolute scale of temperature means Kelvin scale of temperature. relation between Kelvin(K) and centigrade (°C), °C= K - 273.15 from equation, 273.15 K means 0 °C, which is freezing point of water (ice). when we give temperature to the body, its molecule or atom absorbs thermal energy and vibrate about their mean position. Amplitude of vibration get increases as we go on increasing temperature and for higher temperature force of attraction between molecules gets weaker. Hence for higher temperature, due to weaken the force of attraction between molecule, solid goes into liquid state. and further increase in temperature liquid goes into gaseous state.

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Answer:

An unconformity shows where some rock layers have been lost because of erosion. To date rock layers, geologists first give a relative age to a layer of rock at one location and then give the same age to matching layers at other locations. Certain fossils, called index fossils, help geologists match rock layers.

Explanation: