What is the net force on this box?

Answer:

poles

Explanation:

The magnetic field created by any magnet is always strongest at either pole; both north or south pole.

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The ends of a magnet where the force is strongest are magnetic poles.

Magnetic poles are the regions at each end of a magnet where the external magnetic field is strongest.

A material that produces magnetic field are called magnets. Magnetic poles refers to the ends of a magnet where the forces are strongest and usually, opposite poles attracts each other and same poles repels each other. Example, we can demonstrate is bar magnets.

A bar magnet suspended in the Earth's magnetic field orients itself north-south. A north magnetic pole is the north-seeking pole of such a magnet or any similar pole. If the magnets were not strong, then it's magnetic field won't attract.

Thus, the ends of a magnet where the force is strongest are magnetic

poles.

Hence, the correct option is B.

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Answer: The answer is D all of these sorry if i am wrong

Explanation:

Answer:

Take the measurement of the distance (d) with a meter rule (in meters) and also measure the time (t) of the travel in seconds with a stopwatch.

question: What is the speed of the cart?

Explanation:

The speed of an object in motion is the distance covered by the object with respect to time, that is, the ratio of distance covered to the time taken to reach that distance.

Speed = distance / time

           = d (in meters m) / t (in seconds s) = m/s

Numerous design faults in the crew cabin's seats, seatbelts, spacesuits, and life support system were made evident by the Columbia probe.

The Space Shuttle Columbia catastrophe, which happened on February 1, 2003, was a tragic mishap in the American space program. All seven astronauts on the Space Shuttle Columbia during the STS-107 mission perished when it crashed into the sky over Texas.

The space shuttle Columbia's tragic crew's helmets, pressure suits, and seat restraints didn't function properly, causing "lethal trauma" as the out-of-control ship lost pressure and broke apart, killing all seven astronauts, a study found.

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The hydrogen transition that represents the absorption of a photon in the UV portion of the electromagnetic spectrum is Option E: n=1 to n=4.

In the hydrogen atom, the energy levels of the electrons are quantized, and transitions between these energy levels result in the emission or absorption of photons. The energy of a photon is directly related to the difference in energy between the initial and final states of the electron.

In this case, the transition from n=1 to n=4 represents the absorption of a photon in the UV portion of the electromagnetic spectrum. When an electron in the hydrogen atom absorbs a photon, it gains energy and jumps from the ground state (n=1) to the higher energy state (n=4). This transition corresponds to the absorption of UV light.

The energy of the photon absorbed is equal to the difference in energy between the n=4 and n=1 levels. The energy difference increases as the electron transitions to higher energy levels, which corresponds to shorter wavelengths in the UV portion of the electromagnetic spectrum.

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The force F1 is equal and opposite to the downward force thus, F1 is equal to 60 N. The force F2 is inclined to 30 ° from leftward force and it is equal to 38.97 N in magnitude.

Force is an external agent acting on a body to deform it or to change its state of motion or rest. Force is a vector quantity and it is characterised by its magnitude and direction.

If two forces acting on a body from the same directions, then the net force will be the sum of these two forces. If they are acting from opposite directions, they will cancel each other in magnitude.

The force F1 is equal and opposite to the force acting downward. Thus its magnitude is 60 N. The force F2 is inclined to 30 ° from horizontal direction.

F2 = 45 cos 30 = 38.9 N.

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Answer:

They are made of one type of atom.

Explanation:

Answer:

The answer is A

Explanation:

Answer: 5.96m/s

Explanation:

Given the following :

Mass of car (m) = 1500kg

Velocity (V) = 5.25m/s

Forward force of engine = 1250N

Diatance moved = 4.8m

Final Velocity =?

Final kinetic energy = Initial kinetic energy + work done by engine

Initial kinetic energy = 0.5 × mass × velocity^2

Initial kinetic energy = 0.5 × 1500 × 5.25^2

Initial kinetic energy = 20671.875 J

Work done by engine = Force × distance

Work done by engine = 1250 × 4.8 = 6000J

Final kinetic energy = (20671.875 + 6000) J

= 26671.875 J

From kinetic energy = 0.5mv^2

26671.875 = 1/2 × 1500 × v^2

53343.75 = 1500v^2

v^2 = 35.5625

v = sqrt(35.5625)

v = 5.96m/s

Answer:

For how long must an object travel at 29.8km/s to cover 940Gm? t = 940 Gm 29.8 km/s = 940 ⋅ 1 0 9 m 29.8 ⋅ 1 0 3 m s = 9.4 ⋅ 1 0 11 m 2.98 ⋅ 1 0 4 m s ≈ 3.154 ⋅ 1 0 7 s .

Explanation:

It will take 3,15,43,674 sec to cover a distance of 940 Gm with a speed of 29.8 km/s.

Speed [s], distance [d] and time [t] are related to each other by the following relation -

s = d/t

Given is an object travelling at 29.8 km/s in order to cover 940 Gm.

In 1 Gm(Gigameter) there are 1000000000 m or 10⁹ m

Speed of object [s] = 29.8 km/s = 29800 m/s.

Distance to be covered [d] = 940 x 10⁹ m

Time taken to cover the distance of 1 Gm will be -

t = 1 Gm / 29800

t = (10⁷ x 100) / 29800

t = 10⁷/ 298

t = 33557.1 seconds

Therefore, in order to travel 940 Gm, it will take -

940 x 33557.1 = 3,15,43,674 sec

Therefore, it will take 3,15,43,674 sec to cover a distance of 940 Gm with a speed of 29.8 km/s.

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Young's modulus using the cantilever depression method, we need to use the formula:

Y = (4FL^3) / (3bh^3d)

where Y is the Young's modulus, F is the force applied, L is the length of the cantilever, b is the breadth, h is the thickness, and d is the depression.

In this case, the length of the cantilever is given as 1m or 100cm, and the load applied is 150gm or 0.15kg. The depression is given as 4cm, and the breadth and thickness of the beam are given as 3cm and 5mm, respectively.

We need to convert the thickness to cm, which gives us 0.5cm.

Substituting these values in the formula, we get:

Y = (4 x 0.15 x 100^3) / (3 x 3 x 0.5^3 x 4)

Simplifying this, we get:

Y = 4.5 x 10^5 N/cm^2

Therefore, the Young's modulus of the beam is 4.5 x 10^5 N/cm^2.

It's important to note that when using the cantilever depression method, it's crucial to ensure that the beam is loaded within its elastic limit, and the deflection or depression is small enough to be considered as a linear relationship between the force applied and the deflection.

Additionally, it's important to take into account any sources of error, such as friction or air resistance, that may affect the accuracy of the results.

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Her total displacement is 0 m as she returned to her initial position.

In a 50-meter pool, Neva swam 3 complete laps (down and back). Let's find her total displacement.

Solution: Total displacement is the distance covered in a particular direction. In this problem, we have to find the total displacement covered by Neva in the swimming pool. She swam 3 laps (down and back) in a 50-meter pool. Therefore, the distance swam by Neva is;

Total distance swam by Neva = 3 laps × 50 m/lap Total distance swam by Neva = 150 m

Total displacement will be zero because displacement only considers the overall distance covered in a particular direction.

Even though Neva swam 150 m (total distance) in the pool, she returned to her initial position after completing each lap. Thus, her overall displacement is zero or no displacement. Therefore, her total displacement is 0 m.

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Answer:

6.5/3.8 seconds

Explanation:

u=7.5

a=3.8

v=14

find t

The first formula has u,a v and t

so use that one

14=7.5+3.8t

6.5=3.8t

t=6.5/3.8 seconds

Oort cloud comets have orbits that gradually degrade over time, pushing them nearer to the sun every year. A is the right answer.

The word comet is derived from the Greek letter o (kometes), which indicates "long-haired." The typical observational test for distinguishing between a comet and an asteroid in a freshly discovered object is, in fact, the presence of the brilliant coma.

Comets are solar system-orbiting icy balls of rock, gas, and dust. They resemble a small town in size when frozen. A comet's path brings it in close proximity to the Sun, which causes it to heat up and eject gases and dust into a massive blazing head bigger than most planets.

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Answer:

4 smaller disks

Explanation:

We are given;

Mass of smaller and larger disks = M

Radius of smaller disk = R

Radius of larger disk = 4R

Formula for moment of inertia about cylinder axis is:

I = ½MR²

Thus;

For small disk, I_small = ½MR²

For large disk, I_large = ½M(2R)² = 2MR²

We are told that moment of inertia of System A consists of two of the larger disks. Thus;

I_A = 2 × I_large = 2 × 2MR²

I_A = 4MR²

We are also told that System B consists of one of the larger disks and a number of the smaller disks. Thus;

I_B = I_large + n(I_small)

Where n is the number of smaller disks.

I_B = 2MR² + n(½MR²)

I_B = MR²(2 + n/2)

We are told that the moment of inertia for system A equals the moment of inertia for system B. Thus;

I_A = I_B

So;

4MR² = MR²(2 + n/2)

MR² will cancel out to give;

4 = 2 + n/2

Multiply through by 2 to give;

8 = 4 + n

n = 8 - 4

n = 4

Answer:

\(from \: first \: equation \: of \: motion \\ v = u + at \\ a = \frac{v - u}{t} \\ a = \frac{15 - 24}{12} \\ a = - 0.75 \: {ms}^{ - 2} \)

Answer:

a = -0.75 m/s^-2

Answer:

yes

Explanation:

Equilibrium means that all the forces acting upon the object are balanced. A cruising airplane has all four forces balanced, with no external forces acting on it. As a result it will remain in its motion at a constant velocity until an external force acts upon it

Answer:

water seeks its own level

Answer:

water

Explanation:

Answer:

Explanation:

Givens

m = 15000 kg

t = 12.1 seconds

vi = 86 km / hr

vf =0

Formula

F = m*a

a = (vf - vi)/ t

vi has to be converted to m/s

86 km/hr [1000 m / 1 km] * [1 hour / 3600 seconds]

86 * 1000 / 3600 = 23.89 m/s

Solution

a = (vf - vi) / t

a = (0 - 23.89)/12.1

a = - 1.97 m/s^2 The minus means that the trains is slowing down.

F = 15000 kg * - 1.97 m/s^2

F = -29615.7 Newtons.

A message to travel from earth to a spacecraft at mars as its closest to earth is about 3.11 minutes.

To find the time, the given values are,

Distance = 56 million kilometers.

Here,

A message needs to be traveled to mars from earth and the distance between Earth and Mars (given) s = 56 million km

Speed of light = 3.00—10^5 km/ sec

As We know Velocity,

Velocity = distance / time

=> time = distance / velocity

Time taken t = 56 million km / 3.00—10^5

= 56 x 10^6 / 3 x 10^5

= 186.666 sec

Time taken t = 3.11 min.

So, the message to travel from earth to a spacecraft at mars as its closest to earth is about 3.11 minutes.

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With a force of 980 N, a weight lifter hoisted the barbell 2.04 m over her head in 5.21 seconds. She raised the barbell with 383.27 W of force.

By the formula

Power = Work / Time

The force used times the distance travelled equals the work done

Work = Force × Distance

With a force of 980 N, a weight lifter hoisted the barbell 2.04 m over her head in 5.21 seconds. She raised the barbell with 383.27 W of force.

Work = 980 N × 2.04 m = 1999.2 J

The barbell is raised in 5.21 seconds.

Now, we can calculate the power:

Power = Work ÷ Time = 1999.2 J / 5.21 s

Power ≈ 383.27 W

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Answer:

6.67km/hr²

Explanation:

Given parameters:

Velocity  = 40km/h

Time  = 6h

Unknown:

Acceleration = ?

Solution:

Acceleration is the rate of change of velocity with time.

  Acceleration  = \(\frac{v - u}{t}\)  

v is the final velocity

u is the initial velocity

t is the time

    Acceleration  = \(\frac{40 - 0}{6}\)   = 6.67km/hr²

The gravitational force exerted on the block B is 20 N

The objective of this question is to determine the gravitational force exerted on block B.

From the diagram attached below, the free-body diagram shows that the gravitational force exerted on block B can be expressed as:

\(\mathbf{F_g = mass \times gravity}\)

∴

\(\mathbf{F_g =2 \ kg \times 9.8 m/s^2}\)

\(\mathbf{F_g =19.6 \ kg.m/s^2}\)

\(\mathbf{F_g \simeq 20 \ N}\)

Therefore, we can conclude that the gravitational force exerted on the block B is 20 N

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The average change in momentum for the car during the trip is 8400 kg·m/s.

What is Momentum?

Momentum is a vector quantity, meaning it has both magnitude and direction. The direction of momentum is the same as the direction of velocity, and its magnitude is proportional to both the mass and the velocity of the object.

Then, we calculate the final momentum of the car during the remaining 3 hours:

Final momentum during the remaining 3 hours = mass × final velocity during the remaining 3 hours = m × v2

Now, we can calculate the average change in momentum:

Average change in momentum = Final momentum - Initial momentum

= (Final momentum during the first 2 hours + Final momentum during the remaining 3 hours) - Initial momentum

= [(m × v2) + (m × v2)] - (m × v1)

= 2m × v2 - m × v1

Plugging in the given values:

Mass of the car (m) = 1400 kg

Initial velocity (v1) = 32 m/s

Final velocity during the first 2 hours (v2) = 38 m/s

Average change in momentum = 2m × v2 - m × v1

= 2 × 1400 kg × 38 m/s - 1400 kg × 32 m/s

= 53200 kg·m/s - 44800 kg·m/s

= 8400 kg·m/s

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In order to determine the density of a cylinder, we need to know its mass and volume. The mass of the cylinder is given as 29.2 grams, but the volume is not provided. Without the volume, it is impossible to calculate the density of the cylinder.

As for whether or not the cylinder will float in water, that also depends on its density. If the density of the cylinder is less than the density of water (1), then it will float. However, without knowing the density of the cylinder, it is impossible to determine whether or not it will float in water.

Answer:

If the length of the pendulum string increases, the period of time increases

Explanation:

The period of a simple pendulum is directly proportional to the square root of length of the pendulum

Answer:

\(\huge\boxed{\sf a = 2.5 \ m/s\²}\)

Explanation:

Mass = m = 1000 kg

Force = F = 2500 N

Acceleration = a = ?

F = ma (Newton's second law of motion)

F = ma

Solve for a.

a = F / m

a = 2500 / 1000

\(\rule[225]{225}{2}\)

The closer the equipotential surfaces are to each other in a particular region, the stronger the electric field is in that region. The larger the distance between the equipotential surfaces, the weaker the electric field in that region. The distance between the equipotential surfaces is directly proportional to the strength of the electric field in that region.

The strength of the electric field in a region can be determined by the distance between the equipotential surfaces. If the equipotential surfaces are closely spaced, then the electric field in that region is strong. Conversely, if the equipotential surfaces are spaced far apart, then the electric field is weak. This is because the potential difference between two adjacent equipotential surfaces is directly proportional to the electric field strength in that region. Therefore, the closer the equipotential surfaces, the higher the potential difference, and the stronger the electric field.

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Answer:

B small positive charge

Explanation: