Freebie/Answered: As part of an experiment, a student wraps a wire in an electric circuit around an iron core, producing a magnetic field. Which phrase best describes the resulting apparatus?

Answer:

Transformers do not allow DC input to flow through. This is known as DC isolation. This is because a change in current cannot be generated by DC

Explanation:

Hope this helps

Answer:

a change in current cannot be generated by DC;

Answer:

b. increases above 750N

Explanation:

Okay

Answer:

3x864/y488bjehdksuwiieirjr

Answer:

B. 10m/s

Explanation:

If a drone flies 8 m/s due East with respects to the wind and the wind is blowing 6 m/s due North, the speed of the drone with respect to the ground is its displacement.

Displacement is calculated using Pythagoras theorem.

d² = 8²+6²

d² = 64+36

d² = 100

Square root both sides

√d² = √100

d = 10m/s

Hence the distance of the drone with respect to the ground is 10m/s

Option B is correct

Answer:

a) a = 2000 g ,  b)  y = 4 cm

Explanation:

a) We can solve this part using the free fall relations

Let's start by finding the speed with which it reaches the ground, just before it starts to decelerate

           v₁² = v₀² + 2 g y

as it comes out of rest the initial velocity is v₀ = 0

           v₁ = √ 2g y

           v₁ = √ (2 9.8 2)

           v₁ = 6.26 m / s

in the braking part the distance is y₂ = 1 mm = 0.001 m

          v² = v₁² - 2 a y₂

       when stopping its velocity is zero v = 0

        a = v₁² / 2y₂

        a = 6.26² / (2 0.001)

        a = 1.96 10⁴ m / s²

This is the braking acceleration.

Let's look for its relationship with the acceleration of gravity

          a / g = 1.96 10⁴ / 9.8

          a / g = 2000

          a = 2000 g

b) to reduce the injury to less than 25%, the maximum acceleration that must be a = 50g = 490 m / s²

Let's find the distance it must travel to have this acceleration

          v² = v₁² - 2 a y

          y = (0 + v₁²) / 2a

          y = 6.26² / (2 490)

          y = 0.04 m

          y = 4 cm

therefore we must have a helmet that deforms 4 cm before the head stops

Most bicycle helmets provide this protection since they are quite elongated

c) The main error in the calculations is not taking into account the  

resistance with the air, in this sense the speed would be less than the calculated one and our calculations would be over estimated.

The second factor is that in a fall there may be an initial velocity different from zero, so the velocity would be higher and the acceleration as well, in this case our calculations are underestimated.

Answer:

The moving object transfers kinetic energy with the object that isn't moving.

Explanation:

Kinetic energy is a form of energy that a object  or particle has by the reason of motion. Potential energy is a form of energy that a object or particle has by the reason of no movement. The object that is moving knocks down or collides with an object that isn't  moving, and the object that is moving transfers kinetic energy to potential energy, and the object that wasn't moving transfers potential energy to kinetic energy.

Answer:

B

Explanation:

Answer:

The average velocity is 7.5 km/h

Explanation:

Let's convert minutes to hours so our answer can be given in a common units of km/hour:

12 minutes = 12/60  hours = 0.2 hours

Now we estimate the average velocity calculating the distance travelled over the time it took:

1.5 / 0.2 km/h = 7.5 km/h

Answer:

If we take downwards as the positive direction -

m a = m g - T     difference between scale and mg is equal to acceleration

T = m (g - a)

m = 604 / 9.80 = 61.6 kg        mass of student

T = 61.6 (9.80 - 1.98) = 482 N         scale reading

The force when the elevator then accelerates downward at 1.98 m/s² is 725.78 N.

When the lift is stationary (at rest), the student is subject to a downward force equal to 604 N, which is caused by gravity (assumed to be equal to the student's weight according to the scale).

Given:
Force, F = 604 N

Acceleration, a = 1.98 m/s²

The mass can be computed from force and acceleration due to gravity

F = mg

604 N = mass × 9.81

mass = 604 N / 9.81

mass =  61.56 kg

The force is calculated as:

F' = ma

F' = 61.56 kg × 1.98

F' = 121.78 N

The total force is :

Total force = F +F"

Total force = 604 N + 121.78 N

Total force = 725.78 N

Hence, the force when the elevator then accelerates downward at 1.98 m/s² is 725.78 N.

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Given parameters:

Frequency of the wave  = 1520kHz   = 1520 x 10³Hz

Unknown:

Wavelength of the radio photon = ?

Energy of the wave = ?

Solution:

The wavelength of any electromagnetic wave can found using the expression below;

          C = f x ∧

Where C is the velocity of light  = 3 x 10⁸m/s

            f is the frequency of the wave

            ∧ is the wavelength

Since the unknown is ∧, input the known parameters and solve for it;

       3 x 10⁸  = 1520 x 10³  x ∧

    Wavelength  = [tex]\frac{3 x 10^{8} }{1520 x 10^{3} }[/tex]  

   Wavelength  = [tex]\frac{3 x 10^{8} }{1.52 x 10^{6} }[/tex]

  Wavelength  = 1.97 x 10²m

ii. Energy of the wave;

        Energy of a wave  = hf

where h is the planck's constant = 6.63 x 10⁻³⁴ J Hz⁻¹

           f is the frequency of the wave

Input the parameters and solve;

            Energy of the wave = 6.63 x 10⁻³⁴ x 1.52 x 10⁶

                                               = 10.1 x 10⁻²⁸J

The energy of this wave is 10.1 x 10⁻²⁸J

Wavelength of the wave  = 1.97 x 10²m

Energy of the wave = 10.1 x 10⁻²⁸J

Given:

Frequency of the wave  = 1520kHz   = 1520 x 10³Hz

To find:

Wavelength of the radio photon = ?

Energy of the wave = ?

The wavelength of any electromagnetic wave can found using the expression below:

c = f * ∧

Where,

c is the velocity of light  = 3 x 10⁸m/s

f is the frequency of the wave

∧ is the wavelength

On substituting the values:

3 x 10⁸  = 1520 x 10³  x ∧

Wavelength  = 1.97 x 10²m

Energy of a wave  = h*f

where,

h is the Planck's constant = 6.63 x 10⁻³⁴ J Hz⁻¹

f is the frequency of the wave

On substituting the values:

Energy of the wave = 6.63 x 10⁻³⁴ x 1.52 x 10⁶

Energy of the wave = 10.1 x 10⁻²⁸J

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Answer:A.

Explanation: The reaction system absorbs 22kJ of energy form the surroundings

Answer:   The reaction system absorbs 22 kJ of energy from the

surroundings.

Explanation:   I took the test.

Calculate the time to reach a height of 49 m:

S = V0 t - 1/2 g t^2

S = 34.3 t - 1/2 * 9.8 * t^2

4.9 t^2 - 34.3 t + 49 = 0

I get t = 2 and t = 5    as solutions of the quadratic.

We know that it takes v / a = 34.3 / 9.8 = 3.5 sec to reach maximum height.

So we have:

2 sec to reach 49 m

3.5 sec to reach max height

1.5 sec from 49 m to max height

1.5 sec from max height back down to 49 m

2 sec to fall from 49 m to ground

2 sec + 1.5 sec + 1.5 sec = 5 sec  to go from ground to max height and back down to 49 m

Answer: 10m per second.

Explanation: 100/10 is 10/1, so it would be 10m per second.

Answer:

the kinetic energy force made the not to stay in a position if the person is not careful

Answer:

The current will flow counter-clockwise and be decreasing

Explanation:

Answer:

Nuclease is the answer I know

I hope this is the answer

Answer:

[tex]\theta= (-74.42)^{\circ} C[/tex]

Explanation:

Horizontal speed of water, [tex]v_{xf}=9\ m/s[/tex]

Height, h = -53 (below pool)

We can find firstly the final vertical speed of the water using third equation of kinematics. So

[tex]v^2_{yf}=u^2_{yi}+2(-g)h\\\\v^2_{yf}=2\times -9.8\times -53\\\\v_{yf}=32.23\ m/s[/tex]

Let [tex]\theta[/tex] is the angle where the falling water moving as it enters the  pool. So,

[tex]\tan\theta=\dfrac{v_{yf}}{v_{xf}}\\\\=\dfrac{-32.3}{9}\\\\=-74.42^{\circ} C[/tex]

Hence, the angle is (-74.42)°C.

Answer: electricity

Explanation:

Answer:

The location of the survey is biased.

Explanation:

If someone left a movie theater, it is most likely because he likes watching movies there. A better place to interview would be on the streets, as it’s less biased there

Answer:

It will be D/ The location of the survey introduced bias!

Explanation:

Explanation:

As the molecules heat and move faster, they are moving apart. So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward.

Answer:

Option (d) is correct.

Explanation:

As the large mass M is found to just balance two of the small mass, m, so

[tex]M=2m\cdots(i)[/tex]

As both the masses M as well as m are forced to go around a bend of 1.0 m at a constant speed of 1.0 m/s.

So, the radius of curvature of the bend (curved path), R= 1.0 m

The speed both the masses, v= 1.0 m/s.

Naturally, without any restriction, all the masses have the tendency to move in a straight line due to its inertia, but here both the masses are moving on the curved path because of the application of the external force on them. This continuous change in the direction is due to the force by the wall of the curved path which is actually the normal reaction by the wall on both the masses.

This reaction force, [tex]F_R[/tex], balance the centrifugal force, F with which the masses have a tendency to go out of the path, the magnitude of this centrifugal force is,

[tex]F = \frac {mv^2}{R}[/tex]

Where m is the mass of the body, v is the speed at that instant, R is the radius of curvature of the path.

So, [tex]F_R=\frac {mv^2}{R}[/tex]

Now, for the small mass, m, the reaction force on it is

[tex]F_R1= \frac {mv^2}{R}[/tex]

[tex]\Rightarrow F_R1= \frac {m(1)^2}{1}[/tex]

[tex]\Rightarrow F_R1= m \cdots(ii)[/tex]

And for the bigger mass, M, the reaction force on it is

[tex]F_R2= \frac {Mv^2}{R}[/tex]

[tex]\Rightarrow F_R2= \frac {M(1)^2}{1}[/tex]

[tex]\Rightarrow F_R2= M[/tex]

By using equation (i), we have

[tex]F_R2= 2m[/tex]

[tex]\Rightarrow F_R2=2F_R1[/tex] [by using (ii)]

[tex]\Rightarrow F_R2 / F_R1 = 2/1[/tex]

So, the ratio of force acting on the bigger mass M to the magnitude of the force acting on the smaller mas m is 2:1.

Hence, option (d) is correct.

The arrow should be fired with an initial speed of approximately 31.2 m/s to land 90.4 meters away when aimed at a 45.0-degree angle.

To calculate the initial speed required for an arrow fired at a 45.0-degree angle to land 90.4 meters away, we can utilize the principles of projectile motion.

In projectile motion, the horizontal and vertical components of motion are independent. We can break down the initial velocity into its horizontal and vertical components.

Angle of projection (θ) = 45.0 degrees

Range (horizontal distance) (R) = 90.4 meters

We can start by finding the horizontal component of the initial velocity (Vx) using the formula:

Vx = V * cos(θ)

Where V is the initial velocity.

Since the angle is 45.0 degrees, the cosine of 45.0 degrees is equal to 1 / √2.

Vx = V / √2

Next, we can find the vertical component of the initial velocity (Vy) using the formula:

Vy = V * sin(θ)

Again, since the angle is 45.0 degrees, the sine of 45.0 degrees is equal to 1 / √2.

Vy = V / √2

To determine the initial speed required, we need to consider the time of flight (T) for the arrow to reach the range. The time of flight can be calculated using the formula:

T = (2 * Vy) / g

Where g is the acceleration due to gravity (approximately 9.8 m/s^2).

Once we have the time of flight, we can calculate the horizontal component of the initial velocity (Vx) using the formula:

Vx = R / T

Now, we can substitute the expressions for Vx and Vy into the original equation:

Vx = V / √2

Vx = R / T

Solving for V:

V = Vx * √2

V = (R / T) * √2

Plugging in the given values of R and T:

V = (90.4 m / T) * √2

Finally, substituting the value of T:

V = (90.4 m / [(2 * Vy) / g]) * √2

Simplifying further:

V = (90.4 m * g * √2) / (2 * Vy)

V = (90.4 m * 9.8 m/s^2 * √2) / (2 * (V / √2))

V = (90.4 m * 9.8 m/s^2) / V

Squaring both sides:

V^2 = (90.4 m * 9.8 m/s^2) / V

Rearranging the equation:

V^3 = 90.4 m * 9.8 m/s^2

Taking the cube root of both sides:

V = ∛(90.4 m * 9.8 m/s^2)

Using a calculator, the final answer is:

V ≈ 31.2 m/s

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Answer:

Explanation:

Time-base of the oscilloscope is set at 500 [tex]\mu s[/tex]/div. It means, one block in horizontal direction represents 500 microseconds. The period of the wave is the time to complete one oscillation and in the picture there is two-block for complete one oscillation, so the period and oscillation are:

[tex]T=(2)(500) =100 \mu s \rightarrow f=\frac{1}{T}=\frac{1}{100 \times 10^{-6}}=10000 Hz[/tex]

the time period of the signal is 1200μs and hence its frequency is 833 Hz

An oscilloscope is a sort of electronic test tool that shows fluctuating electrical voltages visually as a two-dimensional plot of one or more signals as a function of time. The primary goals are to display repeating or single waveforms on the screen that would otherwise occur too quickly for the human eye to discern. The exhibited waveform may then be analysed for amplitude, frequency, rising time, time interval, distortion, and other features. Previously, these values were calculated by manually measuring the waveform against the scales incorporated into the instrument's screen. Modern digital equipment may immediately compute and show these parameters.

Given,

Time knob = 500 μs/div

wavelength of wave in oscilloscope =  2.4 div

Period of time of the wave is 2.4 div×500 μs/div = 1200μs

frequency of the wave is 1/T = 1/12μs = 833 Hz

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Answer:

the order from highest to lowest is      C> B> F> E> A> D

Explanation:

This is an exercise in calorimetry where the heat given off by the copper cylinder is equal to the heat absorbed by the water  

     Q_c = m_Cu ce_Cu ΔT_Cu  

    Q_a = m_water Ce_water ΔT  

    Q_c = Q_a  

    m_Cu ce_Cu (T_o-T_f) = m_water ce_water (T_f - T_i)

we clear the final temperature and substitute the values

With this expression we can know the final temperature of the system, let's substitute the values ​​that are constant throughout the calculation

With this expression we can know the final temperature of the system, let's substitute the values ​​that are constant throughout the calculation

a) m = 0.250kg, To = 30ºC  

      T_{fa}=(387 0.250 30 + 376740) / (15697.5 + 387 0.250)  

      T_{fa}= 379642.5 / 15794.25  

      T_{f} = 24.04ºC  

b) m = 0.500 kg, To = 60ºC  

     T_{fb} = (387 0.500 60 + 376740) / (15697.5 + 387 0.500)

     T_{fb} = 388350/15891  

     T_{fb = 24.44 ° C

c) m = 0.750 kg, To = 90ºC  

    T_{fc}= (387 0.750 90 + 376740) / (15697.5 + 387 0.750)  

    T_{fc}= 402862.5 / 15987.75  

    T_{fc} = 25.20ºC  

d) m = 0.500 kg, To = 15ºC  

    T_{fd} = (387 0.500 15 + 376740) / (15679.5 + 387 0.500)

    T_{fd} = 379642.5 / 15891  

    T_{fd} = 23.89ºC

the order from highest to lowest is      C> B> F> E> A> D

Answer:

The correct option is a: 214 nm.

Explanation:

The wavelength (λ) of the light can be calculated as follows:

[tex] \lambda = \frac{yd}{nD} [/tex]   (1)

Where:

y: is the distance of the 7th bright fringe on the screen from the central fringe = 10.0 cm

d: is the distance between the slits = 3.00x10⁻⁵ m

D: is the distance between the screen and the slits = 2.00 m

n = 7

By entering all the above values into equation (1) we have:

[tex] \lambda = \frac{yd}{nD} = \frac{0.10 m*3.00 \cdot 10^{-5} m}{7*2.00 m} = 214.3 nm [/tex]

Therefore, the correct option is a: 214 nm.

I hope it helps you!

Answer:

kinsey sexuailty doesn't matter because that is his or her  

Explanation:

Explanation:

F=GMm/d^2

Distance between friends and us <<<<<Distance between centre of earth and us

Answer:

a = 0 m/s²

T = 2m₂g

Explanation:

In this scenario of a pulley with two masses hanging vertically over it, the formula of acceleration is given as follows:

a = g(m₁ - m₂)/(m₁ + m₂)

It is given that:  m₁ = m₂ = m

Therefore,

a = g(m - m)/(m + m)

a = g(0)/(2m)

a = 0 m/s²

The tension of the rope in such case is given by the following formula:

T = 2m₁m₂g/(m₁ + m₂)

It is given that:   m₁ = ∞

Therefore,

T = 2(∞)m₂g/(∞ + m₂)

T = ∞(2m₂g)/∞(1 + m₂/∞)

T = 2m₂g/(1 + 0)

T = 2m₂g