helppppppppppppppp.......
what is the final velocity of a body if it is moving with 13 m/s in 300 seconds and its acceleration is 30 m/s 2.
?​

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:

the answer is B from negative pole to positive pole

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.

Learn more about sleep apnea here:

https://brainly.com/question/28202090

#SPJ2

Answer:

Graph C

Explanation:

With the same force and more mass, the position in time will still be parabolic

i.e.  x = ½at², but the rate of acceleration will be lower so the position curve will be broader.

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:

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:

2.8s

Explanation:

=>a = v-u/t

=> t = v - u / t

= 28-0 / 10

= 2.8 s

Answer:

A. 234

Explanation:

An alpha particle is a Helium atom which has a mass number of 4 and atomic number of 2. So, an alpha particle decay cause the mass number to decrease by 4 units.

So 238 - 4 = 234

The answer is A

Answer:

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

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:

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:

Explanation:

1.The focal length is equal to half of the …………….

b . The radius of Curvature

2.The point on principal axis at which parallel rays; coming from infinity; converge after reflection is called the …………….

a. Principal Focus

3.Which of the following best describes the image formed by a plane mirror?

c. Virtual, erect and the same size as object

4.Which of the following best describes the image formed by a convex mirror?

a. Virtual, erect and magnified

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:

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:  

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:

123.2newtons

Explanation:

weight =mass × gravity

w= m×g

gravitational pull is approximately 10N/Kg

w= 12.32kg×10n/kg

=123.2newtons or 12.3N

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.

To know more about Temperature :

https://brainly.com/question/11464844

#SPJ2.

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.

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:

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:

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:

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]

To know more about speed follow

https://brainly.com/question/6504879

Answer:

i҈ d҈o҈n҈t҈ k҈n҈o҈w҈ w҈h҈a҈t҈ y҈o҈u҈r҈ s҈a҈y҈i҈n҈v҈ b҈c҈h҈

Answer:

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

Explanation:

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

the answer is the first one

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;

gram

Explanation