Which of the following best describes an electromagnet?
Need a Hint?
A) permanent magnet
B) insensitive to electrical currents
C) unchanging magnetic properties
D) temporary magnet

The speed of the ball when it left his foot is 11.13 m/s.

A projectile is an object that is launched or projected into the air and is only subject to the acceleration of gravity. Projectile and trajectory both refer to the same thing: an object.

The given parameters;

distance of the goal, d = 26 m

angle of projection of the ball, =  26°

height of the cross bar, H = 2.4 m

The speed of the projectile will be calculated by applying the formula for maximum height reached by a projectile;

[tex]H=U^{2} sin^{2}/2g[/tex]

[tex]u^{2} =2gh/x=sin^{2}[/tex]

[tex]u^{2} =2*9.8*2.4/sin^{2} 26[/tex]

[tex]u^{2} =81.10[/tex] m/s

u=9 m/s

Thus, the speed of the ball when it left his foot is 9 m/s.

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A ball is thrown vertically upward with a velocity of 20m/s from the top of a multistory building. The height of the point where the ball is thrown is 25 m from the ground. The height will the ball rise is 20m. 5s long will it be before the ball hip the ground.

The direction of a body or object's movement is defined by its velocity. In its basic form, speed is a scalar quantity. In essence, velocity is a vector quantity. It is the speed at which distance changes. It is the displacement change rate.

A. for solving how high will ball go , velocity at the top point will be 0 this gives ,

s = v² - u² / 2a

= 0 - 20² / -2 × 10

= 20m

B. Time to reach maximum height can be obtained from v = u + at

0 = 20 + ( − 10 ) t

t = 2s

s = ut + 0.5at²

= 20 ( 2 ) + 0.5 ( −10 ) ( 2 )²

= 20m

Therefore, the total distance for maximum height is 45 m

s = ut + 0.5at²

45 = 0 + 0.5 ( 10 ) ( t )²

t = 3s

Then,

Total time = 3+2

= 5s

Thus, A ball is thrown vertically upward with a velocity of 20m/s from the top of a multistory building.The height will the ball rise is 20m. 5s long will it be before the ball hip the ground.

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The uncertainty in the electron's momentum is infinity.

What is Heisenberg Uncertainty Principle?
According to Heisenberg's uncertainty principle, it is impossible to precisely measure or quantify an object's location or momentum. The wave-particle duality of matter serves as the foundation for this idea. The uncertainty in the location and velocity of objects with relatively high masses is insignificant in the macroscopic world, therefore Heisenberg's uncertainty principle may be disregarded; nevertheless, in the quantum world, it has important implications. Due to the extremely tiny masses of atoms and subatomic particles, any improvement in positional precision will be followed by a corresponding rise in velocity uncertainty.

Heisenberg's uncertainty principle is a fundamental idea in quantum mechanics that explains why it is impossible to measure more than one quantum variable at once.

From Heisenberg uncertainity principle

Dx. Dp >h/2pi

Dx =0,

Dp = infinite

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Energy transformed into internal energy due to air friction is found to be 1.799 ×10¹⁰ J.

This question can be solved by the use of work energy theorem.

According to work energy theorem the work done by all the forces is equal to the change in kinetic energy of the system.

Given, mass of satellite m= 575 kg

distance of satellite from earth's surface (h)= 525 km

final velocity of the satellite [tex]v_{f}[/tex]= 2.20 km/s= 2.20×10³ m/s

We know that mass of sun M =6ˣ10²⁴ kg

Radius of earth R= 64ˣ10⁵ m

The total energy of satellite when in orbit is given by [tex]E= -G\frac{Mm}{2r}[/tex]

Here G is the gravitational constant= 6.67430×10⁻¹¹ m³kg⁻¹s⁻²

r= R+h= 6925000m

On putting all the values and solving we get

E= -1.661ˣ10¹⁰ J (This is the initial energy when the satellite was orbiting sun)

According to question the satellite hits the earth surface with [tex]v_{f}[/tex]= 2.20 km/s= 2.20×10³ m/s.

So, the gravitational potential energy is given by [tex]U= -G\frac{Mm}{R}[/tex]

On putting the values and solving we get U= -3.59×10¹⁰ J

The satellite will also have kinetic energy when it hits the surface given by K.E= [tex]\frac{1}{2}mv^{2}[/tex]

On putting the values and solving we get K.E= 0.13×10¹⁰ J

Total energy (T.E) of the satellite when it hits the ground is the sum of kinetic energy and potential energy

T.E= K.E+U= -3.46×10¹⁰ J

The energy which was transferred into internal energy due to the air friction is the difference of the total initial energy (E) and total final energy (T.E)

Internal energy= E- T.E

= (-1.661+3.46)×10¹⁰ J

=1.799 ×10¹⁰ J

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Escape velocity doesn't depends on the weight of a rocket.So, The escape velocity for the lighter rocket is the same as that for the heavier rocket.

Velocity:

Velocity is the primary measure of object position and velocity. It can be defined as the distance traveled by an object in unit time. Velocity can be defined as the displacement of an object in unit time.

Speed:

The rate of change of the object's position in any direction. Velocity is measured as the ratio of distance traveled and time traveled. Velocity is a scalar quantity because it has only direction and not magnitude.

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Degeneracy pressure stops the crush of gravity in all the following except a brown dwarf. The correct option is a.

Electron degeneracy pressure is a subset of the broader phenomenon of quantum degeneracy pressure.

The Pauli exclusion principle prevents two identical half-integer spin particles from occupying the same quantum state at the same time.

Electron degeneracy pressure, in particular, is what protects white dwarfs from gravitational collapse, as well as the Chandrasekhar limit (the maximum mass a white dwarf can attain) arises naturally as a result of electron degeneracy physics.

Thus, the correct option is a.

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Fnet=mTacom, where Fnet is the net external force acting on the system and mT is the system's total mass, can be used to quickly compute the acceleration of the center of mass.

As a result, the system's center of mass accelerates by 2/3 ms2. The fixed point of rotation for things is their center of mass. There is no angular acceleration when a force is applied to the center of mass because the torque produced is zero. 12.5 radians per second squared is the size of the disk's angular acceleration. The position of the point in relation to the axis of rotation affects the rigid body's linear speed and acceleration at any given moment. Think about the disk's point B once more.

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A uranium atom's nucleus measures 1.5 x 10^-14 mm in diameter and weighs of 2.2635 x 10^17 kg.

The Earth's crust contains 2.8 parts per million of uranium, an element that is found naturally. It is virtually always present in little amounts. It is almost the same in abundance as tin, somewhat less abundant than cobalt, lead, or molybdenum, and more abundant than gold, silver, or mercury.

Nucleus density is determined by the ratio of mass to volume.

Proton mass equals nucleus mass.

Nucleus volume is equal to (4/3)*pi*r3. and r is the radius

A uranium atom's nucleus has a mass of 4.0*10^-25 kg and a diameter of 1.5*10^-14 m.

first, locate volume.

Radius is calculated as follows: 1.5*10^-14 m/2 = 7.5*10^-15 m radius

vol is equal to (4/3)*pi*(7.5*10^-15)3 = 1.76715*10^-42 of volume.

Locate density using the formula d=m/vol (kg/m³)

d = 4.0*10^-25 kg / 1.76715*10^-42 m^3

d = 2.2635*10^17 (kg/m³)

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Correct Question:

The Nucleus Of A Uranium Atom Has A Diameter Of 1.5*10^-14 M And A Mass Of 4.0*10^-25 Kg.

The voltage across the circuit is 277 V. To keep the voltage drop to a maximum of 3%, the allowable voltage drop will be 8.31 V.

Voltage is the potential difference applied between the two opposite terminal of the circuit. The unit of voltage is represented as V. According to Ohm's law voltage in a circuit is the product of current and resistance through the circuit.

The applied voltage cannot be utilised by 100%. There occurs a voltage drop across the circuit. Given that the total voltage applied is 277 V. The maximum allowed voltage drop is 3%.

Thus, maximum allowable voltage drop for 277 v = 277 × 3/100 = 8.31 V.

Therefore, the maximum allowable voltage drop is 8.31 V.

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The speed of the probe relative to the earth is 0.80c.

Given that,

Speed of the spaceship towards the earth v₁₂ = 0.85c

Speed of the probe relative to the ship v₃₁ = - 0.15c

Speed of the probe relative to the earth v₃₂ = ?

The expression to find out the speed of the probe relative to the earth is given as

v₃₂ = (v₁₂ + v₃₁)/[1 + (v₁₂* v₃₁)/c²] = (0.85c - 0.15c)/[ 1 - (0.85c* 0.15c)/c²]

⇒ 0.7c / [ 1 - 0.1275] = 0.7/0.8725 = 0.80c

Thus, the speed of the probe relative to the earth is 0.80c.

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Option A - Falling is the pressure tendency ,If stormy weather were approaching .

  Stormy weather, namely when it includes components like dark clouds, strong winds, thunder, lighting, and rain, is defined as weather that has generated storms or that indicates storms are imminent. It's frequently used in sentences that refer to stormy weather. Low pressure causes active weather. As a result of air rising because it is lighter than the air masses around it, the atmosphere becomes unstable. When the air pressure increases, vapour in the condenses, creating clouds and rain, among other things. Both violent storms and active weather, such as wind and rain, are produced by low pressure systems.

Low-pressure areas have relatively thin atmospheres. Inward winds are a factor in these locations. Low-pressure storms are frequently well-organized.

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The speed when they hit the street will be equal to each other.

A force applied to all bodies on Earth is Weight ( W ), which is caused by Earth's gravity. If a body is free falling, its only acceleration is g , gravity. So gravity increases velocity.

Both objects will show a change in their velocities because of gravity.

The velocity for both objects if one is thrown up and other is thrown down is same which is given by this formula:

= V = - √ (v² + 2gh)

Where,

Final velocity = V

Initial velocity = v

Acceleration due to gravity = g

Distance = h

Now, assuming the upward speed is measured as positive, the speed when the two objects hit the street will be equal to each other.

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(a) The total energy change of this reaction  is  -4,594.82 kJ/mol.

(b) The reaction is exothermic.

The total energy change of the given reaction is determined by taking the difference between the energy of the product and the reactant.

ΔH = Hp - Hr

where;

The given parameters;

ΔH = -2343.52 kJ/mol - 2251.3 kJ

ΔH = -4,594.82 kJ/mol

Based on the negative change in the total energy, the reaction is exothermic.

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Answer: (a) 7.75 g/mL

Explanation: Density is calculated as mass/volume. When you cut the block in half, you cut the mass in half and the volume in half, meaning that the density is the same.

EX: 2/2 = 1; also 1/1 = 1

Answer:

B is the correct one

Explanation:

Answer: Combustibility refers to how reactive a substance is with oxygen.

Explanation:

Combustibility is a measure of a substance's ability to burn or ignite when exposed to oxygen. Substances that are highly combustible are more reactive with oxygen and are more prone to catching fire or burning. Some common examples of combustible substances include wood, paper, and gasoline.

Reduction, on the other hand, refers to a chemical reaction in which a substance gains electrons or hydrogen atoms, or loses oxygen atoms. Reduction reactions are the opposite of oxidation reactions, in which a substance loses electrons or hydrogen atoms, or gains oxygen atoms. Reduction and combustibility are not directly related to each other.

74.25 N much force did the seat exert on Jeremiah at the bottom of the loop.

This is an acceleration technique. When an item is moving in a circle, it is moving ahead while being turned by a consistent force that is directed inward. The Centripetal Force is the name given to this internal resultant force.

Given that,

Mass (m) = 1.5 kg

speed (v) = 33 m/sec

radius (r) = 22m

As we know,

centripetal force (F) = mv²/r

or, F = [1.5 × (33)²] / 22

or, F = 74.25 N

So, 74.25 N much force the seat exert on Jeremiah at the bottom of the loop.

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The statement "If a is a matrix with columns that span rn, then ax = b has a solution for all b in rn" is true.

If a matrix has columns that span rn, it means that the columns of the matrix are linearly independent and can be used to form a basis for rn. This means that any vector b in rn can be written as a linear combination of the columns of the matrix.

Since ax = b has a solution for all b in rn, this means that for any given b, there exists a unique solution x such that ax = b. This is because the columns of the matrix are linearly independent and can be used to form a basis for rn, so any vector in rn can be written as a linear combination of the columns of the matrix.

Therefore, the statement is true.

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a) The work done by frictional force on the skidding car is negative.

b) Positive work is accomplished by the rope's force on the bucket.

c) The work done by the force exerted by the air on the parachutist is negative.

W = F * d = F d cos gives the amount of work done.

where, force is F and displacement is d

a) The road exerts a frictional force on a speeding car skidding to a stop.

In this instance, the frictional force F works in opposition to the direction of motion and opposes the motion itself. The angle between displacement and frictional force, which is in the opposite direction and equals 180°.

So, the work done by the frictional force on the skidding car is negative.

b) A bucket is being raised up a well while being pulled by a rope.

The bucket is raised upward by the rope's upward force F. The force and displacement are in the same direction, and their angle is equal to zero.

So, the work done by the force exerted by the rope on the bucket is positive.

c) As a parachutist falls to the ground, air pulls on a parachute.

The air opposes the parachutist's descent with a force F as they both plummet to the ground under the influence of gravity. The force exerted by the air is in a direction opposite to the motion of the parachutist. The force of air and displacement have an angle of 180 degrees.

So, the work done by the force F exerted by the air on the parachutist is negative.

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Number of oxygen molecules in each breath is 2.9X10^21

Given that the volume of air inside a breath (V) = 6.0×10^−4 m^3

oxygen in fresh air = 20%

volume of oxygen in fresh air = 20/100 x 6.0×10^−4 = 1.2x10-4m^3

pressure in the lungs (P)=  1.0×10^5 pa

Temperature of air (T) =300K

Using ideal gas equation find the number of moles of oxygen

PV = nRT

Then n = 1.0×10^5 x  1.2x10-4 / 8.314 x 300 = 4.8x10-3mol

We know the number of molecules in 1 mol is 6.023x10^23

Then the number of molecules in 4.8x10-3mol of oxygen is =

4.8x10-3molx 6.023x10^23 = 2.9x10^21

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An artesian well flows without pumping because the water in a confined aquifer is pressurized.

The correct option is C.

Artesian wells are aquifers in which the pressure in the aquifer forces the water confined within the ground above the ground surface so that the well will flow without pumping.

Aquifers are underground layers of permeable rock, rock fractures, or sediments that contain water stored or trapped within them.

Types of aquifers include:

Artesian wells are examples of aquifers and do not require pumping.

Some aquifers on the other hand require pumping of the water stored within.

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The calculated answer is 5.31. For an object travelling at a constant speed, v, around a circle with radius, r, the value is given by a = v2/r.

The displacement that an object or particle experiences with respect to time is expressed vectorially as velocity. The meter per second (m/s) is the accepted unit of velocity magnitude (also known as speed). Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is travelling along a path. In other words, velocity is a vector, whereas speed is a scalar value. Additionally, we will confirm that the acceleration vector points in the direction of the circle's center. It is acceptable to assume that an object travelling in a circle at a constant speed is accelerating as a result of this. Because the velocity vector's direction is shifting, it is accelerating. A = v2/R.

speed= distance/ time

= 100/18.8

=5.31

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When two people push the cart, then it will move with a faster speed.

According to Newton's third law of motion, for every action there is an equal and opposite reaction.

When we push the cart, our action of pushing causes the reaction of the cart moving with the same force as that of our push in the opposite direction.

If only the boy pushes the cart, then there will be a smaller force of push and hence the cart will move slowly. When two people will push the cart, the force will be larger and as a result the cart will move at a faster speed.

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Proxima Centauri's third planet can be seen by observing variations in brightness over a period of more than two years. The third planet that orbits Proxima Centauri, the star nearest to the Sun, has been found by astronomers.

The transit method has so far been used to discover the great majority of planets orbiting other stars.

Therefore, 3 New Planets Found By Kepler Telescope In The “Goldilocks Zone” The planets that circle distant stars are around the size of Earth and are orbiting. At a distance from their suns that keeps the temperatures on their surfaces in the middle.

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The given statement that a star moving away from us, we observe the light to be shiftest towards the blue end of spectrum is a false statement.

This phenomenon is called doppler effect. Doppler effect of light can be described as the apparent change in the frequency of the light observed by the observer due to relative motion between the source of light and the observer

In the given situation, the source of the waves is the star, which emits light (the waves). The observer is on Earth, and the star (the source of the waves) is moving away from the observer, so, wavelength of the light observed by us is shifted with respect to the original wavelength of the light emitted by the star.

when the star moves away, the wavelength increases, so it shift towards the red end of spectrum. This effect is called red-shifted.

In the given case, the star is moving away from us, so light will shift towards red end of spectrum.hence, The given statement is false.

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The displacement covered by the particle in the given time is 50 meter.

The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.

Initial velocity of the particle: u = 10 m/s.

Final velocity of the particle: v = 15 m/s.

Time interval: t = 4 second.

Hence, the average velocity of the particle = (10+15)2 m/s = 12.5 m/s.

The displacement covered by the particle in the given time:

s = average velocity × time interval

=  12.5 m/s × 4 second.

= 50 meter.

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The rope's force is equal to 64.N. The word "force" has a specific meaning in science. At this level, calling a force a push or a pull is entirely appropriate.

A force is not something an object "has in it" or that it "contains." One thing experiences a force from another. There are both living things and non-living objects in the concept of a force. As we discovered in a previous session, forces are significant because they induce modifications to motion. In his first law, Isaac Newton really mentions this. According to this law of inertia, an object stays in its condition of rest or motion unless it is affected by an external, unbalanced force.

resolution with a vertical component

↑ \s⏐ \s⏐ \s+

Let de = T N be the rope's tension.

Then,

T \s− \sm \sg \s= \sm \sa

T \s= \sm \sa \s+ \sm \sg \s= \sm \s( \sa \s+ \sg \s)

= \s5 \s( \s3 \s+ \s9.8 \s)

= \s64 \sN

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The wavelength of light is 619.04 nm.

Solution:

From the figure, the distance between four maxima Y = 2.0 cm

Distance between successive bright fringes Ay Y/4=0.5 cm = 0.005m

We know Ay - 2D d (1)

d = 0.20mm = 1.7 x 10m

D= 17m

From equation (1)

∧ =Δyd/D  

∧ = 0.005×0.20×10⁻³/17 = 619.04 nm

Wavelength is the distance between identical points in adjacent cycles of a waveform signal propagating in space or along a wire. In wireless systems, this length is usually expressed in meters, centimeters, or millimeters. Wavelength is the distance between two wave crests and the same for wave troughs.

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The force of gravity, between the earth and a 70 kg human standing on the surface is 688N.

The force that pulls items toward the center of a planet or even other body is known as gravity. Each of the planet are kept in orbit about the sun by gravity. But in a wider sense, gravity is a force because it represents the interaction that happens when two masses are in close proximity to one another. Fundamentally, the stretching of space and the movement of items through the stretched spacetime are what produce gravitational effects. However, the outcome appears to be the result of applying force.

the force of gravity ⇒ Fg = G Mm/ R²

Fg=gravitational force

G=gravitational constant

M=mass of Earth

m=mass of object

R=distance from earth's centre to object's centre

Fg = (6.67 × [tex]10^{-11}[/tex]× 5.98[tex]10^{24}[/tex]×70)/ (6.37×[tex]10^{6}[/tex])×(6.37×[tex]10^{6}[/tex])

⇒ Fg ≅ 688N.

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x =−0.422 m  is the compression distance of the trampoline.

Energy efficiency a basic rule of physics and chemistry states that despite internal changes, the overall energy in an isolated system remains constant. It is the underlying principle of the first rule of thermodynamics, which is most frequently stated as "energy cannot be generated or destroyed."

Given, Mass m = 32 kg

restoring force, k = 5000 n/n

height, h = 1 m

According to the concept of Conservation of energy,

initial total Energy = final total Energy

Ui + Uepe +Ki = Uf + Uepe + Kf

here,

Ui,Uf  = initial,final potential energy

Uepe = elastic potential energy

Ki,Kf = initial,final Kinetic energy

mgh+1/2kx²+0 = mgh+1/2kx²+0

32×9.8×1+0+0 = mgx+1/2kx²

313.6 = 313.6x +1/2×5000×x²

0 = 313.6 + 313.6x + 2500x²

x = [313.6± (√313.6² - 4× -2500×313.6)]/2×313.6

x = -0.422 0r x = 0.29

The compressing of the spring should be considered to be represented by the negative figure of x.

x =−0.422 m  is the compression distance of the trampoline.

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​

Answer:

b. magnitude is the correct option

Answer:

B.) magnitude

Explanation:

The magnitude of an earthquake is a measure of the amount of energy released by the earthquake. The magnitude is typically expressed on the Richter scale, which is a logarithmic scale that quantifies the size of an earthquake based on the amplitude of the seismic waves it generates. The magnitude of an earthquake is a measure of the earthquake's size and power, and is not the same as its intensity, which is a measure of the earthquake's effects on a specific location. A seismogram is a record of the ground motion during an earthquake, as recorded by a seismograph. Force is not directly related to an earthquake.