why isn't direct current used in transformers​

Answer:

The ball will go as high as 8.46 m

Explanation:

Projectile Motion

It's the type of motion that experiences an object launched at a certain height above the ground and moves along a curved path exclusively under the action of gravity.

Being vo the initial speed of the object, θ the initial launch angle, and g the acceleration of gravity, then the maximum height hm can be calculated as follows:

\(\displaystyle h_m=\frac{v_o^2\cdot \sin^2\theta}{2g}\)

The soccer ball is kicked at a speed of vo=24 m/s at an angle of θ=31°. Taking the value of \(g=9.8 m/s^2\), then:

\(\displaystyle h_m=\frac{24^2\cdot \sin^2 31^\circ}{2\cdot 9.8}\)

\(\displaystyle h_m=\frac{576\cdot 0.2653}{19.6}\)

\(h_m=7.80~m\)

The ball will go as high as 8.46 m

Answer:

b) directional

Explanation:

The prediction that alcohol slows reaction time is Directional . This is because for alcohol to be known as one which slows reaction time means there have been various hypothesis conducted which supports this.

In this case, formulation of a null hypothesis is usually necessary which means that alcohol does not slow reaction time and another alternative hypothesis that suggests that alcohol slows reaction time.

Answer: while electric fields aren’t visible or tangible, they are mensurable.

Explanation: you might want to attach the experiment notes to your question***

Answer: 13 miles.

Explanation:

Answer: In a circuit with parallel resistors, the voltage across each resistor is the same, and the total resistance is equal to the reciprocal of the sum of the reciprocals of the individual resistances.

Since the total resistance is 550Ω and there are four resistors of equal value, the value of each resistor is 550Ω / 4 = 137.5Ω.

Since the voltage across each resistor is 12V and there are four resistors, the voltage across each resistor is 12V / 4 = 3V.

The current through each resistor can be found using Ohm's law, which states that the current through a resistor is equal to the voltage across the resistor divided by the resistance.

Thus, the current through each resistor is 3V / 137.5Ω = 0.0218A.

So, the voltage across each resistor is 3V, and the current through each resistor is 0.0218A.

The voltage across and the current through each parallel resistor is respectively 12 V and 0.384 amp.

A stream of charged particles, such as electrons or ions, travelling through an electrical conductor or a vacuum is known as an electric current. The net rate of electric charge flowing through a surface or into a control volume is how it is calculated.

Given that:

the total voltage is 12 V.

the total resistance is 550Ω.

The resistance of every resistor = 500/4 Ω = 125 Ω.

As they are connected in parallel combination, the equivalent resistance of them = 125/4 Ω

=31.25 Ω.  

As they are connected in parallel combination,  the voltage across  each resistor is same and it is 12 Volt.

And the current through each parallel resistor = V/R

= 12/31.25 amp

=0.384 amp.

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The current in the circuit is 0.5 A. This is clear from the compilation of the question.

We know that the current has to do with the the quotient of the resistance and the voltage of the circuit. In this case we would follow the provisions of the Ohm's law.

Given the Ohm's law;

The effective resistance can be obtained as; 11 + 5 + 4 =  20 ohm

Where V = IR

V = voltage

R = resistance

I = current

Then;

I = V/R

= 10-volt/20 ohm

= 0.5 A

Thus there is the flow of a current of about 0.5 A in the circuit as shown.

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Missing parts;

An 11-ohm resistor, a 5-ohm resistor, and a 4-ohm resistor are connected in a series across a 10-volt potential difference. Find the current

Answer:

The formula for potential energy depends on the force acting on the two objects.

Answer:

V = (S2 - S1) / t = (750 - 500) m / (300 - 100) s = 1.25 m/s

Likewise during segment (D)

V = (0 - 750) m / (500 - 300) s = -3.75 m/s

Answer:

It is the force that opposes motion between two surfaces touching each other. ( OR ) The force between two surfaces that are sliding or trying to slide across each other.

Explanation:

Answer:

a constant force that acts on objects that rub together

Explanation:

a constant force that acts on objects that rub together

The graph that best represents the skydiver's kinetic energy during her dive is a graph that starts at 0 at the beginning of the dive, increases to a peak at 15 seconds when the skydiver reaches terminal velocity, and then decreases rapidly after 40 seconds when the parachute is opened.

Answer:

A

Explanation:

Answer:

D. Conduction

Explanation:

Convection heat transfer occurs in fluids, while conduction heat transfer occurs in solids.

To determine the angle through which the wheel rotates in 1.00 second, we can start by finding the angle covered in 0.0710 seconds and then scale it up to 1.00 second.

In 0.0710 seconds, the wheel completes 3.10 revolutions. One revolution corresponds to an angle of 360 degrees or 2π radians. Therefore, in 0.0710 seconds, the wheel rotates through an angle of:

Angle = 3.10 revolutions * 2π radians/revolution = 6.20π radians

To find the angle in 1.00 second, we can use proportional reasoning. Since the time increases by a factor of 1.00/0.0710, the angle covered will also increase by the same factor:

Angle in 1.00 second = 6.20π radians * (1.00/0.0710) = 87.32π radians

Approximately, the angle through which the wheel rotates in 1.00 second is 274.39 radians.

Therefore, the wheel rotates through an angle of approximately 274.39 radians in 1.00 second.

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Answer:

the substitute bride is a good girl who knows

8.27 x 1013 meres is the orbital radius.

Jupiter's mass, 1.9 x 1027 kg, and the time interval, 16.9 days, are equal to 1.46 x 106 seconds. The radius is needed, thus r. Solution

The moon must be held in its orbit by a gravitational force equal to the centripetal force between Jupiter and the moon.

6.67 x 10⁻¹¹ N/m²kg

2 x 1.9 x 10/27 x 1.46 x 10'6 / 4 r = 6.85 x 102'7 G = 6.67 x 10'11 N/m2kg2 r = 8.27 x 10'7

The second-largest moon in Jupiter's orbit and the third-largest moon in the solar system is called Callisto. Of all the objects in our solar system, its surface has the most craters.

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Answer:

An asteroid impact could affect the tilt of the Earth due to the force it applies onto the planet. This would change Earth's seasons due to the fact that Earth's tilt causes seasons.

Answer:

the resultant wave is the algebraic sum of all the waves reaching that particular point at a given time.

Explanation:

imagine two or three waves reaching a particular particle x at the same time. The particle will vibrate those waves and give out or transmit a resultant wave which is the algebraic sum of the incoming two waves. If both the waves have the same amplitude and phase, the resultant wave will be amplified. However if the waves have the same amplitude and equal but opposite phase then the resultant wave will be a straight line

Answer:

25 ohms

Explanation:

Hi there!

Ohm's law states that \(V=IR\) where V is voltage, I is current and R is resistance.

Plug the given information into Ohm's law (V=50, I=2) and solve for R

\(V=IR\\50=2R\)

Divide both sides by 2 to isolate R

\(\frac{50}{2}= \frac{2R}{2} \\25=R\)

Therefore, there are 25 ohms of resistance present in this circuit.

I hope this helps!

An object that exhibits electric interactions after rubbing is described as charged. This statement is true.

In static electricity, rubbing can be said to create the type of spark you get when you walk across a wool carpet.

For example, due to the static electricity created when you rub an object on your hair (let's say a baloon), the balloon

Some psychologists believe that eating disorders represent a defense against unconscious conflicts related to sexual development. These psychologists have adopted a Psychoanalytic approach to eating disorders.

A psychoanalytic approach is based on the idea that our unconscious thoughts, feelings, and motivations can have a powerful influence on our behavior by focusing on helping individuals to gain insight into their unconscious processes, recognize and resolve conflicts, and modify their behavior.

Therefore, with this data, we can see that a Psychoanalytic approach is based on unconscious mental processes to develop a cure.

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Answer:

A

but it depends on the car

Explanation:

The materials, ingredients, and equipment used must be included in a

HACCP plan.

Hazard analysis and critical control points(HACCP) is a safety plan used in

preparing food in order to ensure risks such as biological and chemical are

reduced to the barest minimum.

This plan contains the materials, ingredients and equipment which are the

vital components used in preparing food(sous vide soup). The components

are analyzed to identify and control the ones which may cause any form of

hazard.

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Answer:

20 kg

Explanation:

The kinetic energy (KE) of an object is given by:

KE = (1/2) * m * v^2

Where m is the mass of the object, and v is its velocity.

We can rearrange this formula to solve for the mass:

m = 2 * KE / v^2

Plugging in the values given:

m = 2 * 1000 J / (10 m/s)^2

m = 20 kg

Therefore, the mass of the Puffin flying at 10 m/s with 1000 J of KE is 20 kg.

Answer:

B. 2 Hz

Explanation:

Given parameters:

Period of the wave  = 0.5Hz

Unknown:

Frequency of the wave  = ?

Solution:

Frequency is the number of waves that passes through a point.

Period is the time taken for a number of waves to pass through a point.

  Period is the inverse of frequency

  Frequency  = \(\frac{1}{t}\)  

 t is the period

  Frequency  = \(\frac{1}{0.5}\)  = 2Hz

Answer:2

Explanation:

Each of the five friends needs to pay £12 to cover the cost of their own meals and contribute towards the birthday person's meal. Using mean allows us to distribute the cost equally among the friends, ensuring a fair division of expenses for the meal.

To determine how much each of the five friends needs to pay, we can use the concept of averages (mean) and divide the total cost by the number of people paying.

In this scenario, the total cost of the meal for 6 people is £12 per person. Since the other 5 friends have decided to pay for the birthday person's meal, they will collectively cover the cost of their own meals plus the birthday person's meal.

To calculate the total cost covered by the five friends, we can subtract the cost of one person's meal (since the birthday person's meal is being paid by the group) from the total cost. The cost of one person's meal is £12.

Total cost covered by the five friends = Total cost - Cost of one person's meal

= (£12 x 6) - £12

= £72 - £12

= £60

Now, to find out how much each of the five friends needs to pay, we divide the total cost covered by the five friends (£60) by the number of friends (5).

Amount each friend needs to pay = Total cost covered by the five friends / Number of friends

= £60 / 5

= £12

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Roller-coaster car slowing to a stop to pick up passengers shows an object gaining potential energy and losing kinetic energy. So, the correct option is B.

Potential energy is defined as the energy stored within an object that exists as a result of the state, position or arrangement of the object which is one of the two primary forms of energy the other being kinetic energy.

The stored energy is released when there is a change in the state, position or arrangement of the object. In the above case, the roller-coaster has kinetic energy because it is in motion, when it slowly stops to pick up passengers it is gaining Potential energy which is stored energy.

Therefore, the correct option is B.

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Answer: The two balls will collide at a height of 7.16 meters above the ground.

Explanation:

Assuming no air resistance, the two balls will collide when they are at the same height and their paths intersect.

The time it takes for the first ball to fall to the ground can be calculated using the formula:

h = (1/2)gt^2

where h is the initial height (10 m), g is the acceleration due to gravity (9.8 m/s^2), and t is the time it takes to fall.

Plugging in the values, we get:

10 = (1/2)(9.8)t^2

Solving for t, we get:

t = sqrt(2*10/9.8) = 1.43 seconds

During this time, the second ball will be traveling upwards. The height it reaches can be calculated using the formula:

h = v0t + (1/2)at^2

where v0 is the initial velocity (10 m/s), a is the acceleration due to gravity (-9.8 m/s^2), and t is the time it takes to reach maximum height.

Plugging in the values, we get:

h = 10(1.43) + (1/2)(-9.8)(1.43)^2 = 7.16 meters

Therefore, the two balls will collide at a height of 7.16 meters above the ground.

Answer:

\((75.0 \times 30) + (60.0 \times 6.0) = (75.0 \times V) + (60.0 \times 0) \\ 2250 + 360 = 75V \\ 75V = 2610 \\ V = 34.8 \: m {s}^{ - 1} \)

The observations of a chemical change is change in colour and formation of bubbles . There can also be a formation of precipitation, change in temperature also odour change

Answer:

B) The formation of a precipitate

Explanation:

Answer:

28 m/s

Explanation:

v(final)^2=v(initial)^2+2a(delta y)

=sqrt(2*-9.8 m/s^2*-40)

28 m/s

The speed of the camera with which it hits the water is 27.93 meters per second.

The speed of an object is the rate of change of position of an object in any of the directions. Speed can be measured as the ratio of distance covered by the object to the total time taken in which the distance was covered by the object. Speed is a scalar quantity because it has only magnitude and no direction.

v = gt

where, v is the velocity,

g is the acceleration due to gravity,

and t is the time taken by the object

v = (9.8 m/s²) (2.85s)

v = 27.93 m/s

Therefore, the speed of the camera as it hits the water is 27.93 meters per second.

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