using 15 percent as machine energy efficiency, what is the actual work output if the total work input is 7500 kilojoules​?
A. 500 kilojoules
B. 750 kilojoules
C. 1,125 kilojoules
D. 7,500 kilojoules

the magnetic field pattern due to the step below if the soft iron is between the two magnets is sketched.

An item constructed of a substance that has been magnetized and produces its own persistent magnetic field is referred to as a permanent magnet. A common example is a refrigerator magnet used to keep notes on the door of the refrigerator. Ferrimagnetic (or ferromagnetic) materials are those that can be magnetized and are also strongly attracted to a magnet. Included in this group are the metals iron, nickel, and cobalt as well as their alloys, a few rare-earth metal alloys, and a few naturally occurring minerals like lodestone. All other substances react weakly to a magnetic field by one of several different types of magnetism, even though only ferromagnetic (and ferrimagnetic) materials are commonly regarded as magnetic. iron is type of material.

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Answer:

i.e. velocity of boy is 2.82 m/s towards west

Explanation:

Given

mass of boy m_b=70.9\ kgm

b

=70.9 kg

mass of girl m_g=43.2\ kgm

g

=43.2 kg

speed of girl after push v_g=4.64\ m/sv

g

=4.64 m/s

Suppose speed of boy after push is v_bv

b

initially momentum of system is zero so final momentum is also zero because momentum is conserved

P_i=P=fP

i

=P=f

0=m_b\cdot v_b+m_g\cdot v_g0=m

b

⋅v

b

+m

g

⋅v

g

v_b=-\frac{m_g}{m_b}\times v_gv

b

=−

m

b

m

g

×v

g

v_b=-\frac{43.2}{70.9}\times 4.64v

b

=−

70.9

43.2

×4.64

v_b=-2.82\ m/sv

b

=−2.82 m/s

i.e. velocity of boy is 2.82 m/s towards west

The kinetic energy of the truck is 44,287,500 J as per the given data.

The energy an object has as a result of motion is known as kinetic energy. A force must be applied to an object in order to accelerate it.

The kinetic energy (K) of an object can be calculated using the formula:

\(K = 0.5 Xm X v^2\)

Where,

m = mass of the object

v = velocity

Plugging in the values given in the question, we have:

\(K = 0.5 X 2900 X (55 m/s)^2\)

\(K = 0.5 X 2900 X 3025 m^2/s^2\)

K = 44,287,500 J (joules)

So, the kinetic energy of the truck is 44,287,500 J.

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import numpy as np:

random_vector = np.random.rand(15)

modified_vector = np.where(random_vector == np.max(random_vector), -1, random_vector)

print("Original Array:", random_vector)

print("Modified Array:", modified_vector)

A NumPy program that creates a random vector of size 15, replaces the maximum value with -1, and prints both the original array and the modified array:

```python

import numpy as np

# Create a random vector of size 15

random_vector = np.random.rand(15)

# Find the maximum value in the vector

max_value = np.max(random_vector)

# Replace the maximum value with -1

modified_vector = np.where(random_vector == max_value, -1, random_vector)

# Print the original and modified arrays

print("Original Array:")

print(random_vector)

print("\nModified Array:")

print(modified_vector)

```

When you run this program, it will generate a random vector of size 15 and display the original array. Then, it will replace the maximum value in the array with -1 and display the modified array.

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The Acceleration of the system is 6.41 m/s².

Given,

α= 15°, m₁ = 7kg

β= 65°, m₂ = 11 kg

Let, a be the acceleration and T is the tensions at the end it's the cord.

Let, the mass m₂ be coming down along the inclined plane along the inclined surface towards downward m₂g sin β and the tension in the upward direction,

Resultant force, m₂a=m₂g sin β -T

11a=((11) ×g sin 65°) -T  ...(i)

Now, considering the motion of m₁ which moves downwards, the forces are m₁g sinα, and T both are acting downwards.

Resultant force m₁a = m₁g sin α+T

7a =7g sin 15°+T  ...(ii)

Solving both the equations by adding them,

18a=11gsin 65°+7g sin 15°-T+T

18a=11gsin 65°+7g sin 15°=115.45

a=115.45/18=6.41 m/s²

Hence, the Acceleration of the system is 6.41 m/s².

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The force needed to break another wire of the same length and material but twice the diameter is 200N.

Because the wires are made of the same material, their modulus of elasticity must be the same.

As a result, the ratio of longitudinal stress to longitudinal strain (Young's Modulus of Elasticity) must be the same. Now, the strains in both wires must be the same before they break.

Therefore,

stress = Young's modulus × strain,

both wires must be the same.

Because the second wire has a diameter twice that of the first, its area of cross section is four times that of the first. As a result, in order to generate the same stress, the force applied to the second wire must be four times that applied to the first wire.(since stress = force/cross section area).

Thus, the force required to break the second wire is 4200=800N.

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Answer:

[Ne] 3s² 3p¹

Explanation:

Answer: 1s2 2s2 2p6

Explanation:

The aluminum ground state would be 1s2 2s2 2p6 3s2 3p1.

However, the Aluminum Ion electron configuration would be 1s2 2s2 2p6 as it has LOST 3 electrons to have the noble gas configuration of Neon (Ne)

Example of an elastic product: Smartphone

Explanation: A smartphone is an example of an elastic product. When the price of smartphones decreases, consumers tend to buy more of them, and when the price increases, consumers tend to buy fewer.

Example of an inelastic product: Prescription medication

Explanation: Prescription medication is an example of an inelastic product. Inelastic goods are those for which changes in price have little impact on the quantity demanded.

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The correct expression for the resulting velocity is -1/2 vcar. The correct option is c.

The directional speed of an item in motion, as measured by a specific unit of time and observed from a certain point of reference, is what is referred to as velocity.

A car travels down a road at a certain velocity, is Vcar.

Let the initial velocity of the car travel downward be -V car

It is also, given, that the driver slows down so that the car is traveling only half as fast as before.

Resulting velocity = -1/2 vcar

Therefore, the correct option is c. -1/2vcar.

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Answer:

Best answer will get Brainliest!!!

What is the volume scaled down by a factor of 1/10

Measurements:

Top: 7 in, both sides: 12 in, front: 12 in, back: 12 in, bottom: 7 in

Please help!

Explanation:

Answer: A & B

Explanation:

Took The test

Answer:

V = 268.8 m/s

Explanation:

The speed of a wave in general is given by the following formula:

V = fλ

where,

V = Speed of that wave

f = Frequency of the wave

λ = wavelength of the wave

In this case we have a sound wave, travelling across carbon dioxide. The properties of sound wave are as follows:

V = Speed of Sound in Carbon dioxide = ?

f = frequency of sound wave = 140 Hz

λ = wavelength of sound wave = 1.92 m

Therefore,

V = (140 Hz)(1.92 m)

V = 268.8 m/s

Hi there!

\(\boxed{\text{Her angular velocity decreases.}}\)

Recall the conservation of angular momentum:

\(L_i = L_f\\\\I_iw_i = I_fw_f\)

When this person extends her arms, her moment of inertia increases.

According to the conservation of angular momentum, if the moment of inertia increases, the angular velocity must DECREASE.

In luminosity classification, it is observed that fat stars tend to have skinny spectral lines. This phenomenon suggests a correlation between the width of spectral lines and the luminosity of a star.

Luminosity classification is a method used to categorize stars based on their brightness and energy output. Spectral lines are dark or bright lines that appear in a star's spectrum, representing specific wavelengths of light emitted or absorbed by different elements in the star's atmosphere. The width of these lines can provide valuable information about a star's physical properties.

The observation that fat stars have skinny spectral lines implies that stars with higher luminosity tend to exhibit narrower lines in their spectra. This correlation can be attributed to the characteristics of fat stars, which generally have higher temperatures and stronger gravitational forces compared to their less luminous counterparts. These factors lead to a higher degree of ionization and higher densities in the stellar atmosphere, resulting in narrower spectral lines. Therefore, the width of spectral lines can serve as an indicator of a star's luminosity, with fat stars showing narrower lines compared to less luminous stars.

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Answer:

561

Explanation: it would most definitely go down as a number because it isn't the same

the work done by tension is Wt = KEf - KEi = 714.05 J (joules).

Part A: Gravity does not do any work in this scenario as it is a conservative force and the girder is not changing height. Therefore, Wg = 0 J (joules).

Part B:  The work done by tension can be calculated using the work-energy principle. The change in kinetic energy of the girder is equal to the work done by tension.
The initial kinetic energy of the girder is KEi = (1/2)mv^2 = (1/2)(950 kg)(0.25 m/s)^2 = 29.7 J.
The final kinetic energy of the girder is KEf = (1/2)mv^2 = (1/2)(950 kg)(1.25 m/s)^2 = 743.75 J.

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Increasing the distance between an electromagnet and the compass will cause the observed effect of the compass to decrease in strength

The strength of the magnetic field produced by an electromagnet decreases as the distance from the electromagnet increases. This means that if the distance between the electromagnet and the compass increases, the magnetic field that the compass is experiencing will weaken.

As a result, the observed effect of the compass will decrease in strength as the distance between the electromagnet and the compass increases.

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The correct relation will be:

(a) K1 = K2

(b) K1 < K2

According to the question,

Potential energy be "P".

Kinetic energy be "K".

(a) Work done towards both the block will be similar.

So,

P₁ = P₂

K₁ = K₂

(b) We know,

α = F/M

or V = a x t

Now,

Kinetic energy = (1/2)mv²

K = 0.5 * M * V²

K = 0.5 * M * F²/M² * t²

K = 0.5 * F² * (t²/M)

Therefore, the kinetic energy of 1 is smaller than kinetic energy of 2 as the force and time will be same. So K of the smaller mass will be greater than the larger mass.

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The child will take  6.52 seconds to complete 15 dribbles.

Frequency means number of cycles completed in one second.

Here we are provided with the dribbling frequency as 2.30 hz, which means the child can dribble a basketball 2.30 times in one sec.

I.e.     f = 1/T =2.30 hz

So , the time period for one dribble  is

T = 1/f

T = 1/ 2.3

T = 0.434 sec

So we have the time period for one dribble as 0.434 sec

Now, similarly we can calculate the time period for 15 dribbles , by multiplying the time of one dribble with the number of times the ball is dribbled.

I.e. time for 15 dribbles = T x 15

  = 0.434 x 15

  = 6.52 seconds

And this is the time for 15 dribbles.

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Answer:

In the lab activity, I used a virtual watershed to demonstrate how pollutants enter and flow through the watershed. I constructed food chains to show how biotic factors are related. I also predicted and modeled how human activity affected the biotic factors in an ecosystem. Based on my observations, I can conclude that biotic and abiotic factors are closely linked and that human activity that changes the environment, like pollution, can affect all the other parts of an ecosystem in a negative way.

Explanation:

A battery-operated power tool, such as a cordless drill, converts electrical energy stored in the battery into mechanical energy through the use of a motor.

The battery, typically a lithium-ion or nickel-cadmium type, supplies the necessary voltage and current to the motor. As electricity flows through the motor's coils, it generates a magnetic field that interacts with permanent magnets, creating rotational force (torque) to turn the drill bit or drive a screw. The conversion of electrical energy to mechanical energy allows for enhanced portability and convenience, eliminating the need for a power cord and enabling users to work in a wide range of locations. Cordless drills often come with variable speed settings and torque adjustments, providing greater versatility and control for various tasks.

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Answer:

motion is the phenomenon in which an object changes its position over time. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, speed, and time.

Answer:

Motion, in physics, change with time of the position or orientation of a body. ... Motion that changes the orientation of a body is called rotation. In both cases all points in the body have the same velocity (directed speed) and the same acceleration (time rate of change of velocity).

Answer:

A: i cant show the graph i did

B: The biker would have gone 3.6 km in 12 minuets

Explanation:

When Albert has an impulse of 29-newton seconds and an impact time of 12 seconds. then the force experienced is 2.4166 N

The product of the average applied force and the time for which it is exerted is known as an impulse.

the mathematical relation for impulse is

Impulse  = F * Δt

where F represents the force applied and Δt represents the time for which the force is applied

As given in the problem Albert has an impulse of 29-newton seconds and an impact time of 12 seconds

By using the formula for impulse

Impulse  = F * Δt

By substituting the respective values in the formula

29 = F×12

F = 2.4166 N

Thus, when Albert has a 29-newton-second impulse and a 12-second impact time. then 2.4166 N of force was applied.

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Answer:

B.Ionizing radiation is the correct answer.

Explanation:

Ionizing radiation has sufficient energy that it can convert atoms and molecules into ions.

It has a sufficient amount of energy that it can separate tightly confined electrons from the orbit of an atom and causing that atom to become ionized.

Answer: lonizing radiation

Explanation:

Got it right

Energy refers to the ability or capacity to do work. Energy can be of various types as follows:

Kinetic energy is energy possessed by an object because of its motion while potential energy is energy possessed by an object because of its position or its condition.

The law of conservation of energy states that energy cannot be created nor destroyed but can only be transformed i.e. converted from one form to another.

Friction is a force that resists the relative motion or tendency to such motion of two bodies in contact.

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Since these three vehicles would all go the same speed at the bottom if released from the same height, they would not all possess the same amount of kinetic energy because they have different amounts of potential energy.

Kinetic energy is dependent on the velocity of the object as well as its mass. Therefore, the three vehicles, though they have the same speed, would differ in their kinetic energy due to their varying mass. This concept is known as mechanical energy and is the sum of kinetic and potential energy.

Mechanical energy is also constant in an ideal situation where no external forces are acting upon the object. For instance, the three vehicles will all have the same mechanical energy at the release point but would not possess the same amount of kinetic energy due to their mass difference. Therefore, they would have different amounts of potential energy when released.

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A car starts from rest and undergoes an acceleration of 7.2 m/s² for a duration of 4.5 seconds. The objective is to determine the velocity of the car at the end of this time.

Velocity of the car at the end of the given time, we can use the equation of motion that relates initial velocity, acceleration, and time:

final velocity = initial velocity + (acceleration × time)

Since the car starts from rest (initial velocity = 0), the equation simplifies to:

final velocity = acceleration × time

Plugging in the given values, we have:

final velocity = 7.2 m/s² × 4.5 s

Calculating the expression, we find:

final velocity = 32.4 m/s

Therefore, the velocity of the car at the end of 4.5 seconds, after accelerating at a rate of 7.2 m/s², is 32.4 m/s.

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