015
10.0 points
A car traveling in a straight line has a velocity
of 5.25 m/s at some instant. After 4.27 s, its
velocity is 9.38 m/s.
What is its average acceleration in this time
interval?
Answer in units of m/s.

The term for basic unit of electric current is called the ampere

Electricity is a collection of physical phenomena related to the presence and motion of matter having an electric charge. Both electricity and magnetism are related to the phenomenon of electromagnetic, as defined by Maxwell's equations.

For electricity generation, the three basic forms of energy are fossil fuels (coal, natural gas, and petroleum), nuclear energy, and renewable energy sources. The majority of electricity is produced by steam turbines powered by fossil fuels, nuclear, biofuels, geothermal, and solar thermal energy.

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Explanation:

using the formula: S=ut+½gt², where u=0, S=?, g=8m/s², t=10seconds.

S=ut+½gt² ("ut" term will cancel because u=0).

=> S= ½gt²

=>S = ½×8×10²

=>S = 4×100

=>S = 400m .

Therefore, the distance traveled by the body in 10s is 400m.

hope this helps you.

If we replace the incandescent bulb with a voltage meter and return the loop to its original configuration, then moving the bar magnet back and forth through the loop will induce an electrical current in the loop, as described by Faraday's law of electromagnetic induction.

A magnet is a material or object that produces a magnetic field, which is a force that can attract or repel certain other materials, such as iron or steel. The magnetic field is created by the motion of electric charges within the magnet, which align in such a way that they produce a net magnetic field. Magnets can be made from a variety of materials, including iron, cobalt, nickel, and certain alloys. They come in many different shapes and sizes, including bars, discs, horseshoes, and rings.

Here,

The type of current that is generated depends on the direction and rate of the magnet's motion. If the magnet is moved back and forth with a constant speed and in a straight line, the current induced in the loop will be an alternating current (AC), because the direction of the current will reverse every time the magnet changes direction. This can be observed by the voltage meter reading a voltage that periodically changes in direction.

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Answer:

Explanation:

Mass ( m ) = 2 kg

Speed of the object (v) = 6 metre per second

Kinetic energy =?

Now,

We have,

Kinetic Energy = \( \frac{1}{2} \times m \times {v}^{2} \)

Plugging the values,

\( = \frac{1}{2} \times 2 \times {(6)}^{2} \)

Reduce the numbers with Greatest Common Factor 2

\( = {(6)}^{2} \)

Calculate

\( = 36 \: joule\)

Hope this helps...

Good luck on your assignment...

The Kinetic energy of the object will be "36 joules".

The excess energy of moving can be observed as that of the movement of an object, component, as well as the group of components. There would never be a negative (-) amount of kinetic energy.

According to the question,

Mass of object, m = 2 kg

Speed of object, v = 6 m/s

As we know the formula,

→ Kinetic energy (K.E),

= \(\frac{1}{2}\) × m × v²

By substituting the values, we get

= \(\frac{1}{2}\) × 2 × (6)²

=  \(\frac{1}{2}\) × 2 × 36

= 36 joule

Thus the above answer is appropriate.

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Answer:

The satellite that is 7500 km above earth's surface is 1.24 times faster than the satellite at 15000 km above earth's surface

Explanation:

Generally the gravitational force acting on each satellite is mathematically represented as

\(F = \frac{G * M_e * m_2 }{r^2}\)

Here \(M_e\) is the mass of the earth

\(r = r_e + R \)

So \( r_e \) is the radius of the satellite and R is the radius of earth with value R = 6371 km

This force is also equivalent to the centripetal force acting on each satellite which is mathematically represented as

\(F = \frac{mv^2}{ r^2}\)

So

\(\frac{mv^2}{ r^2} = \frac{G * m_1 * m_2 }{r^2}\)

=> \(v = \sqrt{ \frac{GM_e}{r} }\)

So for \(r = 7500+ 6371 = 13871 \ km \)

We have that

\(v_1 = \sqrt{ \frac{GM_e}{13871} }\)

and \(r = 15000+ 6371 = 21371 \ km \)

We have that

\(v_2 = \sqrt{ \frac{GM_e}{21371} }\)

So

\(\frac{v_1}{v_2} = \frac{\sqrt{\frac{GM_e}{13871} } }{ \sqrt{\frac{GM_e}{21371}} }\)\(v = \sqrt{ \frac{GM_e}{r} }\)

 =>  \(\frac{v_1}{v_2}  = \sqrt{ \frac{21371}{13871} }\)

 =>   \(v_1    = 1.24 v_2\)

So satellite that is 7500 km above earth's surface is 1.24 times faster than the satellite at 15000 km above earth's surface

The value of angle of reflection of the ray is determined as 70⁰.

option B.

Angle of reflection is the angle between a reflected ray and the perpendicular to a reflecting surface drawn at the point of contact.

Based on the definition of angle of reflection, we can determine the value of angle of reflection from the ray diagram as follows;

The incident angle (angle between the incoming arrow and the normal) = 70 degrees

The reflected angle (angle between the out going arrow and the normal) = 70 degrees

Thus, the value of angle of reflection of the ray is determined as 70⁰.

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The angle of reflection for the light ray shown in the diagram given in the question is 70° (option B)

To determine the angle of reflection, we must bear in mind the laws of reflection. This is given below:

From the above law, we can obtain the angle of reflection. This is illustrated below:

Angle of reflection = Angle of incidence

= 70°

Thus, we can conclude that the angle of reflection is 70° (option B)

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Answer:

c

Explanation:

Since they both expended the same amount of energy, the statement that is true about the situation is: The student's friend developed more power than the student.

The correct option is C.

The rate at which mechanical energy can be given to a system is known as mechanical power. Remember that power is the transfer of energy over a given period of time. Although it can also be measured in watts, mechanical power is frequently expressed in horsepower.

Mathematically;

Power = work done/time taken

Since the student's friend walks up the hill at a faster rate, he developed more power than the student.

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Complete question:

A student walks up a hill. The student’s friend has the same mass and walks up the same hill, but completes the journey in less time. Which statement is true about the situation?

a. The student developed more power than the friend

b. The student expended more energy than the friend

c. The student's friend developed more power than the student

d. The student's friend expended more energy than the student

You could purchase a fitness tracker to help your performance in your current physical activity.

Fitness tracker would help you in the area of goal setting.

Fitness trackers are effective because they have helped my friends to improve workout routine.

Wearable fitness trackers can monitor data like heart rate, number of steps taken, distance traveled, and number of calories burned.

Supplements including protein powders, creatine, and beta-alanine can enhance recovery, muscular growth, and endurance.

Working with a coach or personal trainer can help you attain your fitness objectives by offering personalized training regimens, comments on form and technique, and accountability.

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The mass of the object is approximately 0.457 kg.

The mass of the object attached to the trolley can be calculated using the principle of conservation of momentum. Since the two trolleys couple together and move as a single system after the collision, the total momentum before and after the collision should be the same. Given the mass of one trolley is 0.80 kg and the initial speed is 1.1 m/s, the momentum before the collision is 0.80 kg * 1.1 m/s = 0.88 kg·m/s. After the collision, the total mass is the sum of the two trolleys, and the final speed is 0.70 m/s.

Using the momentum equation, the mass of the object can be calculated as follows:

Total momentum before collision = Total momentum after collision

0.88 kg·m/s = (0.80 kg + mass of the object) * 0.70 m/s

Solving for the mass of the object, we get:

0.88 kg·m/s = (0.80 kg + mass of the object) * 0.70 m/s

0.88 kg·m/s = 0.56 kg + 0.70 kg * mass of the object

0.88 kg·m/s - 0.56 kg = 0.70 kg * mass of the object

0.32 kg = 0.70 kg * mass of the object

Dividing both sides by 0.70 kg, we find:

mass of the object = 0.32 kg / 0.70 kg = 0.457 kg

The two trolleys collide and couple together, the total momentum before the collision is equal to the total momentum after the collision according to the principle of conservation of momentum.

The momentum of an object is defined as the product of its mass and velocity. In this case, the mass of one trolley is known (0.80 kg) and the initial speed is given (1.1 m/s), allowing us to calculate the momentum before the collision.

After the collision, the two trolleys move together at a new speed (0.70 m/s). By setting the initial momentum equal to the final momentum and solving for the unknown mass of the object, we can find its value.

In the calculation, we subtract the masses of the two trolleys from the total mass in order to isolate the mass of the object.

Dividing the difference in momentum by the product of the known mass and the new speed, we obtain the mass of the object. In this case, the mass of the object is approximately 0.457 kg.

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Answer:

Electrons being pulled from one surface to another

Explanation:

The movement of electrons creates electrical charge.

Job enrichment is a strategy used to motivate workers by adding the responsibility and diversity of their work. variant d

Feedback is essential to effective plant enrichment. Successful job enrichment depends on numerous effects, including acceptable backing and operation support, and clear performance norms.

Job Enrichment is a system of hand engagement in which jobs are designed to have intriguing and grueling tasks that may bear further chops and may increase pay.

The purpose of job enrichment is to compound the tasks performed by each hand, allow them to perform tasks in different ways, and eventually give them more control over the work they perform.

One of the most important motorists of change in professional enrichment programs is feedback. This not only needs to be done at the hand- director position, but also needs to be encouraged within the brigades.

Question

According to J. Richard Hackman and Gerg Oldham, which of the following is necessary for job enrichment to be effective?

a) Hygiene

b) Dissatisfied

c) Valencia

d) feedback

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Answer:from,

v=at+u then ,time=4seconds

we take u=initial speed which is zero

(0)

 now, v=(10x4+0)m/s

then, velocity/speed is 40m/s

Explanation:from firt newton's laws of motion where from acceleration is rate of change of speed then we generate the eqn where now the stone was falling fat a certain height were we include acceleration due to gravity and multiply to time and sum to initial speed to get

Answer:

hey!

the answer is

salt

Explanation:

this is due to sand, grass and pebbles are not soluble (they do not dissolve in water)

pls put brainliest

The amount of energy needed to move the car is 4×10⁵ J

E = Fd

E = 2000 × 1000

E = 2×10⁶ J

From the question given above,

For 100 J of energy produced by the engine, 20 J is needed.

Therefore,

For 2×10⁶ J of energy produced = (2×10⁶ × 20) / 100 = 4×10⁵ J is needed.

Thus, 4×10⁵ J of energy is needed to move the car.

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Answer:

See 3 answers below

Explanation:

F = ma

+9.2 + ? =     3.9(+5.8)  

? = + 13.42 N  

+9.2 + ? =  3.9 (-5.8)    

 ? = - 31.82 N

+9.2  + ?   =  3.9( 0 )

? = - 9.2

Cd usually sells for :$16.00

If the Cd is 10% it is 90% of the original price:

16 x (90/100) = 16 x 0.9 = $14.4

Sale tax is 8%

14.4 x (8/100) = $ 1.152

Add the sale tax

14.4 + 1.152 = $15.55

Answer: $15.55

Answer:

I think Albert Einstein invented physics.

Explanation:

Iam soory if Iam wrong.

Newton's second law allows us to find the results for the tension of the rope and the angular acceleration of the body are  

      a) The angular acceleration is α = 26.7 rad / s²

      b) The tension of the rope T = 2.67 N

Given parameters

To find

Newton's second law indicates that the net force is proportional to the product of the mass and the acceleration of the bodies

          ∑ F = m a

Where the bold letters indicate vectors, F is the external forces, m the mass and the acceleration of the body

A free body diagram is a diagram of the forces without the details of the bodies, in the attached we see a free body diagram of the system

Let's apply Newton's second law to the block

                     W - T = m a

Body weight is

                     W = mg

Let's substitute

                    mg - T = ma                  (1)

The pulley is a body that is in rotational motion so we use Newton's second law for rotation

           Σ τ = I α  

Where τ is the torque, I the moment of inertia and α the angular acceleration

In this case the reference system is located at the turning point  

            T R = I α

            T = \(\frac{I \alpha }{R}\)  

Linear and angular variables are related

            a = α R

We substitute in equation 1 and write the system of equations

            mg - T = m α R

                    T = \(\frac{I \alpha }{R}\)

We resolve

              mg = α  (m R + I / R)

             α = \(\frac{g}{R + \frac{I}{mR} }\)  

We calculate

            α = \(\frac{ 9.8}{ 0.30+\frac{0.030}{1.50 \ 0.30} }\)  

            α = 26.7 rad / s²

Let's calculate the tension of the rope

           T = \(\frac{I \alpha }{R}\)  

           T = \(\frac{0.030 \ 26.7 }{0.30}\)

           T = 2.67 N

In conclusion with Newton's second law we can find the results for the tension of the rope and the angular acceleration of the body are  

      a) The angular acceleration is alpha = 26.7 rad / s²

      b) The tension of the rope T = 2.67 N

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Answer:

Period becomes 1/3 of the original

Explanation:

Period = 1/f      if f becomes 3f   then period becomes 1/3 of the original

Answer:

Which feature is created when a block of rock dropped down in relation to the block of rock beside it?

Explanation:

Grabens drop down relative to adjacent blocks and create valleys. Horsts rise up relative to adjacent down-dropped blocks and become areas of higher topography.

Answer:

t = 4.34 s

Explanation:

To get this, we need to calculate the time of each part for both vehicles.

In the case of the bicycle, we can calculate the time duration with it's acceleration:

a = Vf - Vo/t ------> t = Vf - Vo / a

But Vo = 0 so time:

t = 21 / 14 = 1.5 s

Doing the same with the car:

t = 49 / 8 = 6.125 s

With these values of time, we can calculate the distance covered by both vehicles during acceleration:

X = Vo*t + at²/2

X = at² / 2

With the bicycle:

X = 14 * (1.5)² / 2 = 15.75 mi

With the car:

X = 8 * (1.5)² / 2 =  9 mi

And now, we can also get the speed of the car, after the time of 1.5 s has passed.

V = 8 * 1.5 = 12 mi/h

Now we can actually write an equation with both data of the vehicles in function of the distance. We are going to say that "t" would be the time taken by both vehicles, to meet each other.

Distance covered by the bicycle = distance covered by car

Distance covered by the bicycle would be:

15.75 mi + 21t

Distance covered by car:

9 + 12t + (8t²/2)

Equalling both expressions:

15.75 + 21t = 9 + 12t + 4t²

4t² - 9t - 6.75 = 0

Solving for t, using quadratic expressions we have:

t = 9 ± √(9)² + 4*4*6.75 / 2*4

t = 9 ±√189 / 8

t = 9 ± 13.75 / 8

t₁ = 2.84 s

t₂ = -0.594 s

We are taking the positive time.

Then, the time where both vehicles meet, which is the same time interval when the bicycle is ahead of the car will be:

t = 2.84 + 1.5

Hope this helps

The displacement of the object after 1 second, is 3 m.

The displacement of the object after 3 seconds, is 9 m.

The displacement of the object after 5 seconds, is 15 m.

The displacement of an object is the change in the position of the object.

The displacement of the object after 1 second, x = 3 m/s x 1 second = 3 m

The displacement of the object after 1 second, x = 3 m/s x 3 s = 9 m

The displacement of the object after 1 second, x = 3 m/s x 5 s = 15 m

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Answer:

The ball would be traveling fastest at point (C).

Point (D) appears to be the same height as point (C) but the ball would probably have lost some speed on rebounding,

Answer:

Explanation:

Eddy current are loops of electric currents which are induced within conductors when there is a change in magnetic field in the conductor through Faraday's Law of induction.

They are applied in electromagnetic braking. This is where the eddy current acts as brakes to stop moving objects. However, they are used along side mechanical braking systems.

Used in separation of metals such as Aluminum from other metals. Using the eddy current separator, ferrous elements are attracted to the magnet while aluminum being non-ferrous ,is left  separated.

Used in identifying metals in vending machines. These machines use eddy currents to detect fake coins where the fake coins will slow at a certain speed to be identified.

Testing of structure of aircrafts apply eddy currents through procedures of Non destructive examination.

They are used in defect detecting and safety hazards application. Defects in heat exchanger tubes can be detected by eddy currents.

Answer:

Probably electromagnetism

Explanation:

When the door is closed, the steel disk on the door is in close proximity to the coil of wire in the doorframe. This creates a magnetic field around the coil, which induces a small current in the coil.

Ampere's law, which says that the magnetic field created by a current-carrying wire is proportional to the current and inversely proportional to the distance from the wire, may be used to describe the magnetic field produced by a long straight wire carrying a current.

When the door is opened, the steel disk moves away from the coil, which causes the magnetic field to weaken. As a result, the current induced in the coil decreases. This change in current is detected by the home security system as a change in the magnetic field and is interpreted as the door being opened.

In other words, the characteristic of the coil that changes when the door is opened is the amount of current induced in it. The decrease in the magnetic field as the steel disk moves away from the coil results in a decrease in the induced current, which signals to the home security system that the door has been opened.

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Answer:

Explanation:

each grid corresponding  0.1s⁻¹.

0.2grid unit = 0.2×0.1 =0.02s⁻¹

distance of the star from telescope

d = 1/p

d= 1/0.02= 50 par sec

1par sec = 3.26 light year

1 light year = 9.5×10¹²km

3.26ly=3.084×10¹³km

d= 50×3.084×10¹³=1.55×10¹⁵km

Stochastic impacts of radiation allude to those that happen arbitrarily and are not reliant upon the portion got. These impacts are related to the likelihood of events and incorporate disease and hereditary changes. Non-stochastic impacts, then again, have a limit, and their seriousness increments with expanding portions.

Models incorporate radiation consumption and intense radiation conditions. Understanding the qualification among stochastic and non-stochastic impacts of radiation is significant in fields like radiation security, atomic medication, and radiobiology.

It assists in setting radiation with dosing limits, creating well-being rules, and carrying out suitable radiation safeguarding measures. By separating these impacts, experts can evaluate and deal with the dangers related to openness to ionizing radiation all the more successfully.

This information guides choices in regard to radiation wellbeing conventions, word-related openness limits, and the improvement of radiation therapy systems in medication.

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