Q3. A charge of 90C passes through a wire in 1 hour and 15 minutes. What is the current in the wire?
​

Answer:

Explanation:

A

Answer:

72 degrees

Explanation:

(14/70) * 360

=72

The combination of high velocity, kinetic energy, hardness, and irregularity of the sand particles make sand blasting an effective method for cleaning and preparing surfaces, including concrete.

How does the collective force of thousands of small and light grains of sand hitting a surface at high velocity create a powerful abrasive action that effectively removes dirt, grime, paint, rust, and other unwanted materials from the surface when using a sand blaster?

A sand blaster uses compressed air to force a stream of abrasive particles, such as sand, onto a surface to clean or prepare it for painting or other treatments.

Although each grain of sand is small and light, the collective force of thousands of grains of sand hitting the surface at high velocity creates a powerful abrasive action that can effectively remove dirt, grime, paint, rust, and other unwanted materials from the surface.

The sand particles have kinetic energy due to their high velocity, which allows them to physically abrade and remove the unwanted materials from the surface. Additionally, the sand particles are typically harder than the surface being cleaned, which allows them to scratch away the surface layer of the material and expose a fresh, clean layer underneath. This process is known as mechanical abrasion.

Moreover, the sand particles used in sand blasting are often of irregular shapes and sizes, which allows them to reach crevices and corners that may be difficult to clean with other methods.

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Simplifying the expression,

Electric flux (Φ) = (1) - 5) × 10+5 N * (3% - 37) × 10^-2 m²

To calculate the electric flux through a given area, we need to multiply the electric field strength by the area and by the cosine of the angle between the electric field and the normal to the area.

Given:

Electric field strength (E) = (1) - 5) × 10+5 N

Area (A) = (3% - 37) × 10+2 cm²

First, we need to convert the given values to the appropriate SI units:

1 cm² = 10^-4 m²

1 N = 1 kg·m/s²

Area (A) = (3% - 37) × 10^-2 m²

Next, we can calculate the electric flux using the formula:

Electric flux (Φ) = E * A * cosθ

Since the angle (θ) between the electric field and the normal to the area is not given, we assume that the electric field is perpendicular to the area, resulting in θ = 0 degrees. In this case, cosθ = 1.

Electric flux (Φ) = (1) - 5) × 10+5 N * (3% - 37) × 10^-2 m² * 1

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Answer:

the correct is the letter D

Answer:

The answer is "DACB".

Explanation:

The missing data of the question is defined in the attached file please find it.

Using formula:

\(\to F= m \cdot a\\\\ \to m= 5 \ kg\)

In object A:

\(F= 15 \\\\a =\frac{F}{m} = \frac{15}{5} = 3\)

In object B:

\(F= 30 \\\\a =\frac{F}{m} = \frac{30}{5} = 6\)

In object C:

\(F= 20 \\\\a =\frac{F}{m} = \frac{20}{5} = 4\)

In object D:

\(F= 0 \\\\a =\frac{F}{m} = \frac{0}{5} = 30\)

That's why the answer is "DACB" .

The time taken by her to reach a speed of 2.28m/s is 1.37 s whereas, the acceleration on break to stop in 0.86s is 4.47 m/s².

( a ) To find the time we use the formula,

a = Δv / Δt

where,

a is acceleration,

Δv is change in speed

Δt is time

So with this putting the given value,

We have,

1.66m/s² =  2.28m/s / Δt

Δt = 2.28m/s / 1.66m/s²

Δt = 1.37 s

( b ) Again using same formula for acceleration

a = Δv / Δt

So,

a =  2.28m/s / 1.37 - 0.86s

a =   2.28m/s / 0.51 s

a = 4.47 m/s²

The rate of change of displacement is known as velocity. The rate at which velocity changes is called acceleration. Due to the fact that it includes both magnitude and direction, velocity is a vector quantity. As the rate at which velocity changes, acceleration is also a vector quantity.

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(a)The time has taken by a commuter to reach a speed of 2.28m/s is (t)= 1.37 s. (b) If she then brakes to a stop in 0.86s,Theamount of acceleration is (a)=   2.65 m/s².

The term velocity defines that how much distance a particle covered in a given time. The term acceleration defines that change in velocity in a particular time.

( a ) To calculate the time we use the formula, v=u+at

As the particle start from rest so, u= initial velocity would be zero.

The equation becomes, v=at

t=v/a

where, we are given

a= acceleration  of the car =1.66m/s²,

v= speed of the car= 2.28m/s

We have to calculate the time=t

So now we put the given value in the above equation, We have,

t=v/a

Or, t = 2.28m/s / 1.66m/s²

Or, t = 1.37 s

According to the calculation we can say that, The time has taken by a commuter to reach a speed of 2.28m/s is (t)= 1.37 s

( b ) To calculate the acceleration we use the formula, v=u+at

As the particle start from rest so, u= initial velocity would be zero.

The equation becomes, v=at

a=v/t

where, we are given

v= speed of the car= 2.28m/s

t= The time take to break=0.86 s

We have to calculate the acceleration=a

So now we put the given value in the above equation, We have,

a=v/t

Or, a =  2.28 /0.86

Or, a = 2.65 m/s²

According to the calculation we can say that, If she then brakes to a stop in 0.86s,Theamount of acceleration is (a)=  2.65 m/s²

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Since it is practically in the plane of its orbit, its ring system occasionally appears to be made up of near-circles. The majority of scientists think that Uranus' rotation is the result of a violent collision.

In contrast to other planets, Uranus has an axis that nearly parallels its orbital plane. This causes Uranus to rotate virtually on its side as it travels through its orbit, with its poles alternately pointing toward the Sun.

Venus and Uranus' rotation on their axes is remarkable in some ways. All other planets revolve from the West to the East, but they do the opposite.

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Answer:

5.5 m/s

Explanation:

Right on Edge

The statement explains the importance of enzymes that check for and repair mistakes during DNA replication is the enzymes prevent many genetic mutations from being expressed. Thus, the option C is correct.

RNA polymerase is an enzyme that aids in the transcription of DNA into RNA during transcript in the nucleus. The enzymes prevent many genetic mutations from being expressed.

Primase is an enzyme that synthesizes short RNA sequences called primers. These primers serve as a starting point for DNA synthesis during replication as the DNA polymerases cannot begin the synthesis of the new strand, they only extend it after primase begins it and primase produces RNA molecules, the enzyme can be said to be a type of RNA polymerase.

Therefore, The statement explains the importance of enzymes that check for and repair mistakes during DNA replication is the enzymes prevent many genetic mutations from being expressed. Thus, the option C is correct.

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Answer:

For Part (a) : L = N * ( Ф / I )

For Part (b) : 7083.33 H

For Part (c) : ε = L( ( I1 - I ) / Δt )

Explanation:

Part (a) is simply asking if you know the definition of inductance. We know that inductance of a single turn/loop is the magnetic flux threading the turn/loop divded by the current in the turn/loop ( ( Ф / I ) ) . Since you are being asked to find the total inductance of the inductor, you would multiply the inductance of a single turn/loop by the number of turns/loops ( N ). This means that you should get the equation

L = N * ( Ф / I )

Part (b) is plugging in the given numbers into the equation that you expressed in Part (a)

To do so,

L = N * ( Ф / I ) = 350 (turns) * ( 8.5 T·m² / 0.42A ) = 7083.33 H

For reference:

One Tesla (T) is equal to 1 kg / ( s² * A )

One Henry (H) is equal to 1 ( kg * m² ) / ( s² * A² )

*Note that turns is not a unit that is part of the final unit of Henrys, it simply acts as a coeffecient for our purposes.

Part (c) once again asks for you to demonstrate a basic memory of the equation/definition of induced emf (ε). Induced emf is always proprtional to the time rate of change of the current ( ( I1 - I ) / Δt ). This is to say that the induced emf is proprtional to the magnetic flux which is proportional to the magnetic field which is itself proportional to the current. The inductance of the inductor (L) is a constant of proportionality for the induced emf, and thus the time rate of change of the current is multiplied by the inductance of the coil. Thus,

ε = L( ( I1 - I ) / Δt )

The initial velocity of the ball when it left the table is 4.7 m/s.

The initial velocity of the ball is calculated by applying the following kinematic equation as shown below.

vf² = vi² + 2gh

where;

vi² = vf² - 2gh

vi = √(vf² - 2gh)

vi = √(6² - (2 x 9.8 x 0.68) )

vi = 4.76 m/s

Thus, the initial velocity of the ball when it left the table is a function of the final velocity when it hits the ground and the height of fall of the ball.

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Answer:

F = 5.9 N

Explanation:

Given that,

Mass of water, m₁ = 1000 kg

Mass of the Sun, \(m_2=1.99\times 10^{30}\ kg\)

Distance between two bodies, \(r=1.5\times 10^{11}\ m\)

We need to find the force of gravity between water and the Sun. The formula for the gravitational force between two bodies is given by :

\(F=G\dfrac{m_1m_2}{r^2}\\\\F=6.67\times 10^{-11}\times \dfrac{1000\times 1.99\times 10^{30}}{(1.5\times 10^{11})^2}\\\\F=5.89\ N\)

or

F = 5.9 N

Hence, the correct option is (b).

Answer:

Earth's tilted axis causes the seasons. Throughout the year, different parts of Earth receive the Sun's most direct rays. So, when the North Pole tilts toward the Sun, it's summer in the Northern Hemisphere. And when the South Pole tilts toward the Sun, it's winter in the Northern Hemisphere.

Explanation:

Answer:

The energy changes

Explanation:

When an non-conservative force (for example friction, air resistance, applied force) does work on an object, the total mechanical energy (Ek+Ep) of that object changes. If positive work is done, then the object will gain energy. If negative work is done, then the object will lose energy.

Answer:

5.5Ω

Explanation:

The circuit diagram shown is a parallel arrangement. To solve this problem for the equivalent resistance,

  R1  = 10Ω

  R2  = 20Ω

 R3 = 30Ω  

For circuits in parallel, equivalent resistance is ;

   \(\frac{1}{Rt}\)   = \(\frac{1}{R1} + \frac{1}{R2} + \frac{1}{R3}\)  

 Now insert the parameters and solve;

    \(\frac{1}{Rt}\)  = \(\frac{1}{10} + \frac{1}{20} + \frac{1}{30}\)  

    \(\frac{1}{Rt}\)   = \(\frac{6 + 3 + 2}{60}\)  

    \(\frac{1}{Rt}\)   = \(\frac{11}{60}\)  

    Rt  = 5.5Ω

Explanation:

TRUE - Two colliding objects will exert equal forces upon each other. If the objects have different masses, then these equal forces will produce different accelerations. ... FALSE - In any collision, the colliding objects exert equal and opposite forces upon each other as the result of the collision interaction.

The correct definition of precession, and the correct explanation of how does it affect what we see in our sky is the direction in which the earth's rotation axis points in space changes slowly over centuries, and we call this change, precession because of this movement, the celestial poles and therefore the pole star change slowly in time.

Option D is correct.

The north and south celestial poles are described as the two points in the sky where Earth's axis of rotation, indefinitely extended, intersects the celestial sphere.

In conclusion, the celestial poles appear permanently directly overhead to the observers at Earth's North Pole and South Pole, respectively.

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Answer:

When you have two materials with the same index of refraction, it means that if they are touched by a ray of light it won't have a chance, and its form would prevail.

Explanation:

The reason behind this is that in the first place. When light passes through an object of certain refraction it is modified from its natural state, allowing it to change in color to the human eye or many other effects in other perceptive elements. However, when the same light passes through two objects with the same refraction due to their physical characteristics, it doesn't change because once it comes out of the first one it will suffer the same effect from the last one. For it to change the refraction would have to be higher or lower. Then it would be modified. The reason is because the dimensions are not modified. Because at some point the ray of light has to come out of the first one to enter the second one.

Answer:

Train Bike Truck

Explanation:

Option Z is correct. The stainless steel container was likely the hottest. Stainless steel is an excellent heat conductor because it quickly warms the substance.

Stainless steel is an excellent heat conductor because it quickly warms the substance or allows heat to travel through it. Stainless steel is also corrosion-resistant.

Foam, glass, and plastic, on the other hand, are all poor heat and electrical conductors. As a result, they do not allow heat to travel through.

As a result, we may deduce that, among the available possibilities, the stainless steel container was most likely the hottest.

Hence Option Z is correct. The stainless steel container was likely the hottest.

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(a) The horizontal distance between the saddle and the limb when the man makes his move is  7.8 m.

(b) The time spent in air by the stuntman  is 0.78 seconds.

The time taken for the stuntman to fall from the given height is the time spent in air by the stuntman and it is calculated as follows;

h = vt + ¹/₂gt²

where;

h = 0 + ¹/₂gt²

h = ¹/₂gt²

t = √(2h/g)

t = √(2 x 3 /9.8)

t = 0.78 s

The horizontal distance between the saddle and the limb when the man makes his move is calculated as;

X = Vₓt

where;

X = 10 m/s x 0.78 s

X = 7.8 m

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The astronaut is currently in a state of free fall, which indicates that he is experiencing weightlessness and simply having gravity acting on him. He must return to the space station using SAFER and his available gear.

Unless a net force applies on an object, it remains at rest until that force does. According to the second law, an object will accelerate in the force's direction when it is subject to a net force. According to the third law, there is an equal and opposite reaction force for every action force.

According to the first law, an object won't alter its motion unless a force acts on it. According to the second law, an object's force is equal to its mass times its acceleration. The third law asserts that every action has a corresponding and opposing reaction.

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Answer:

(1)

H² = B² × L²

H² = (9.2)² × (5.2)²

H² = 84.64 × 27.04

H² = 2288.6656

H = √ 2288.6656

H = 47.84

Answer:

Use Pythagorean theorem

19) A² + B² = C²

5.2² + 9.2² = C²

C = √111.68

C = 10.567875...

C ≈ 10.6

21) A² + B² = C²

B² = C² - A²

B² = 7.2² - 5.3²

B = √23.75

B = 4.873397...

B ≈ 4.9

I get 0.686 m/s east.

If a negatively charged particle is moving to the right, the current in the wire also flows to the right, then the direction of the magnetic field will be upward due to maxwell's right-hand thumb rule.

Maxwell's Right-Hand Rule of Thumb:

Following this rule, imagine grasping a live wire with your right hand, with your thumb pointing in the direction of the current. The direction in which the finger grips the wire is the magnetic field lines around the wire. The right-hand rule used to find the direction of the magnetic field due to the current element is the direction of the magnetic field.

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The energy per photon in green light of wavelength 516 nm is approximately 0.136 eV higher than in red light of wavelength 610 nm.

The energy of a photon can be calculated using the equation E = hc/λ, where E represents the energy, h is the Planck's constant (\(6.626 x 10^-34\) J*s), c is the speed of light (3\(3.00 x 10^8 m/s\)), and λ is the wavelength of light.

To determine the energy difference between green light (516 nm) and red light (610 nm), we can plug in the respective values into the equation.

For green light

E_green = \((6.626 x 10^-34 J*s * 3.00 x 10^8 m/s) / (516 x 10^-9 m)\)

E_green ≈\(3.84 x 10^-19 J\)

For red light:

E_red = \((6.626 x 10^-34 J*s * 3.00 x 10^8 m/s) / (610 x 10^-9 m)\)

E_red ≈ \(3.27 x 10^-19 J\)

The energy difference can be calculated as:

ΔE = E_green - E_red

ΔE ≈ \(3.84 x 10^-19 J - 3.27 x 10^-19 J\)

ΔE ≈ \(0.57 x 10^-19 J\)

Converting the energy difference to electron volts (eV):

1 eV ≈ \(1.6 x 10^-19 J\)

ΔE ≈ \(0.57 x 10^-19 J * (1 eV / 1.6 x 10^-19 J)\)

ΔE ≈ 0.36 eV

Therefore, the energy per photon in green light (516 nm) is approximately 0.36 eV higher than in red light (610 nm).

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Based on the given values of n, l, and ml, the only unknown quantum number is ms. According to the rules of quantum numbers, ms cannot be negative, which means it can only have values of +1/2 or -1/2. Therefore, both values (+1/2 and -1/2) are valid for ms, and there is no quantum number that has a value that is not valid in this case.
For n=4, l=1, ml=2, and ms=12, the quantum number that has a value that is not valid is ml.

According to the rules:
- l must be in the range of 0 to (n-1), which is 0 to 3 for n=4. So, l=1 is valid.
- ml must be in the range of -l to +l, which is -1 to +1 for l=1. Therefore, ml=2 is not valid.
- ms can have values of +1/2 or -1/2, so ms=12 is not valid as well.

Therefore, both values (+1/2 and -1/2) are valid for ms, and there is no quantum number that has a value that is not valid in this case.
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Answer: Because of the friction force acting directly on the bag.

Explanation:

The function of the wheels is diminish the effect of the friction force, when the friction pulls back, it makes the wheel rotate, and this force is not applied directly on the bag.

Now the wheels are not working, so now the friction is acting directly on the bag, this is why the mand finds more difficult to drag the bag.

Answer: A) True, you are correct

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Explanation:

Power in physics is defined as

power = (change in work)/(change in time)

which shows that power is basically the rate of work done. We can think of it like a speed of sorts.

------------

For example, if you apply 100 joules of work over 2 seconds, then,

power = (100 joules)/(2 seconds)

power = (100/2) joules per second

power = 50 watts

A watt is defined to be a joule per second, and it's often used to measure how much electricity is consumed, but it has broader uses in physics as well.