A 50Kg girl jumps off a 5-meter-high diving board. What is her kinetic energy right before she
hits the water?
A. 0 J
B. 25 J
C. 1225 J
D. 2450 J

Answer: Negative

Explanation: If electric field lines point radially toward a charge, that charge must be Negative

There is an air dielectric breakdown (10 mT). This happens when air (a dielectric) breaks down and charges are transferred from the sky to the earth.

In an electromagnetic wave, the connection between the strength of the electric and magnetic fields is E=cB.

where E is the size of the electric field.

The speed of light is c.

B is the magnetic field's strength.

E=3.106V/m is the electric field, and c=3.108m/s is the speed of light in this equation.

When we solve for B, we get B=E/c=3.106 V/m/3.108 m/s=0.01T=10mT.

When the electrical voltage across a material is greater than the substance's dielectric strength, dielectric breakdown occurs, leading to partial ionization. When a gas breakdowns, the ionization dramatically diminishes the gas' electrical insulating qualities, producing a spark or an arc.

High electric strengths (on the order of 1 MV/cm) and phenomena resembling those for gases control breakdown in highly purified liquid dielectrics. Liquids, which can contain particles, other liquids in suspension, and dissolved gases, are sadly readily polluted.

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Answer:

connect two 9 ohms resistance in series now it becomes 18 ohm

Answer:

2) zero acceleration

Explanation:

Motion can be defined as a change in the location (position) of a physical object or body with respect to a reference point.

This ultimately implies that, motion would occur as a result of a change in location (position) of an object with respect to a reference point or frame of reference i.e where it was standing before the effect of an external force.

Mathematically, the motion of an object is described in terms of time, distance, speed, velocity, position, displacement, acceleration, etc.

In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.

Generally, an object is said to be in equilibrium when neither the energy possessed by the object not state of motion changes with respect to time. Thus, the vector sum of all the forces acting upon an object that's in equilibrium is zero.

In conclusion, an essential characteristic of an object in equilibrium is zero (0) acceleration because there's no change in its velocity with respect to time.

Answer:

power= work done /time.

Answer:

W = Force  * distance

Power = W/ time

Explanation:

Answer:

A ball is thrown straight up with a speed of 30

m/s. What is the maximum height reached by

the ball?

The correct option is c: p = 0.60. The probability that the test will result in a Type II error, given that the power of the hypothesis test is 0.80, is option c: p = 0.60.

The probability that the test will result in a Type II error, given a power of 0.80, is 0.60. Power is the probability of correctly rejecting a false null hypothesis in a hypothesis test.

It is equal to 1 minus the probability of a Type II error, which occurs when the null hypothesis is false, but we fail to reject it.

In this case, since the power of the test is 0.80, it means that there is an 80% chance of correctly rejecting a false null hypothesis.

Therefore, the probability of making a Type II error is 1 minus the power, which is 1 - 0.80 = 0.20. Thus, the probability of a Type II error is 0.20 or 20%.

Hence, the correct answer is option c: p = 0.60, indicating that the probability of a Type II error is 0.60 or 60%.

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Answer: Snowy and rainy

Explanation:

Answer:

C. A Covalent Bond

Explanation:

two covalent bond form between the two oxygen atoms because oxygen requires two shared electrons to fill its outermost shell

Answer: D

Explanation: Examples of action-reaction pairs include a swimmer pushing off a wall, helicopters creating lift by pushing air down, and an octopus propelling itself forward by ejecting water from its body.

The force lies in the negative y direction, that is in the third quadrant.

Since the force does positive work on a particle that has a displacement pointing in the x direction, we can conclude that the force must be pointing in the same direction as the displacement, which is in the positive x direction.

Similarly, since the force does negative work on a particle that has a displacement pointing in the y direction, we can conclude that the force must be pointing in the opposite direction as the displacement, which is in the negative y direction. Therefore, the force lies in the negative y direction, which corresponds to the third quadrant.

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Sand dunes during the Dust Bowl are an example of windward.

The sand dunes are formed due to high movement of wind in the deserts which make dunes in the direction where wind is moving. Windward refers to facing the wind or situated on the side facing the wind.

So in those regions where the wind moves bring sand with itself and make dunes in that area so we can conclude that sand dunes are formed in the windward regions.

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Light with a frequency of 5.80 * 1014 hz travels in a block of glass that has an index of refraction of 1.52.

(a) Wavelength of the light in the vaccum is 5.17 X 10⁻⁷m

(b) Wavelength of light in glass is 3.40 X 10⁻⁷m

Given;

Frequency (λ) : 5.80 X 10¹⁴ Hz

Refractive index (η) = 1.52

(a) Wavelength of light λο = C/f

where, c = speed of light

f = frequency

                                      λο = (3 X 10⁸ m/s)/5.8 X 10¹⁴ Hz

                                      λο = 5.17 X 10⁻⁷

Wavelength of the light in the vaccum is 5.17 X 10⁻⁷m

(b) Wavelength of light in glass λ = λο/η

where, η = Refractive index

               λ = λο/η = (5.17 X 10⁻⁷m) X 1.52 = 3.40 X 10⁻⁷m

Therefore, wavelength of light in glass is 3.40 X 10⁻⁷m

The distance between the two crests or troughs of the light wave is known as the wavelength of light. Using the Greek letter lambda (λ), it is identified. As a result, wavelength refers to the separation between one wave's crest or dip and the following wave.

Visible spectrum: The part of the electromagnetic wave that can be observed by human vision is known as the visible spectrum. The visible spectrum in the electromagnetic spectrum spans from the infrared to the ultraviolet regions. Between the infrared and ultraviolet wavelength ranges is where the visible light falls. From 400 nanometers (violet) to around 700 nanometers, the human eye can sense light (red). Other electromagnetic radiations are either outside the range of biological function or are too small or huge to be detected by the human eye.

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Answer:

a = F/M = 4000/1500 = 2.66m/s^2

The acceleration of the car is 2.6667 m/s²

To calculate the acceleration, mass is given as m = 1500 kg

Force = 4000 Newtons

         Acceleration is the change in velocity for the given period of time.  

                       a=dv/dt

                             or

                          =(v2-v1)/(t2-t1)    

          Acceleration can be defined as a net force on an object is directly proportional to the magnitude of the force in the same direction and is inversely proportional to the mass of the object.

The unit of acceleration is meter / second²

This is the definition based on the Newton's second law.

                                F = ma

         acceleration, a = F / m

                                   = 4000 N / 1500 kg

                                   = 2.6667 m/s²

Thus, acceleration can be calculated as   2.6667 m/s².

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Answer:

draw the two atomic structures and then focus in on the electrons either gaining or losing and draw them with arrows and dots

Explanation:

Answer:

the first one is the excellorator and the second on is 30 seconds

Answer: 0.078

Explanation:

Given variables:

R1 = 25.0 , R2 = 64.0 , I1 = 0.200

Step 1: find V

0.200 = v/25

0.200 * 25 = v

5 = v

Step 2: Solve for I2

I = V/R

I = 5/64

I = 0.078125

Hope this helps!

The torque due to the child's weight is nmgx_offset, and the torque due to the adult's weight is -mnmg(x_offset + d), where n is the multiple of the child's mass for the adult rider, m is the mass of the child, g is the acceleration due to gravity, x_offset is the distance of the child's center of mass from the end of the board, and d is the distance of the fulcrum from the center of the board. The total torque is the sum of these two torques.

Mass of the child (m)

Mass of the adult (n * m, where n is the multiple of the child's mass)

Acceleration due to gravity (g)

Distance of the child's center of mass from the end of the board (x_offset)

Distance of the fulcrum from the center of the board (d)

To achieve static equilibrium, the total torque acting on the see-saw must be equal to zero. The torque due to the child's weight is given by nmgx_offset, where n is the multiple of the child's mass for the adult rider, m is the mass of the child, and x_offset is the distance of the child's center of mass from the end of the board.

The negative sign in front of mnmg(x_offset + d) is because the adult is seated on the left side of the fulcrum, causing a clockwise torque. The total torque is the sum of these two torques, which must be equal to zero for static equilibrium.

Mathematically, the torque equation can be written as:

nmgx_offset - mnmg(x_offset + d) = 0

Simplifying, we get:

nmgx_offset - mnmgx_offset - mnmgd = 0

Combining like terms, we obtain:

mnmgd = nmgx_offset

Finally, solving for d, we get:

d = x_offset/n

Therefore, the distance of the fulcrum from the center of the board (d) is equal to the distance of the child's center of mass from the end of the board (x_offset) divided by the multiple of the child's mass for the adult rider (n).

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The pressure will 657 MM Hg.

The relationship between pressure and temperature for a fixed volume of an ideal gas can be described by the Ideal Gas Law: PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature in Kelvin.

P1 = (700 mm Hg) x (101.3 kPa / 1 mm Hg) = 70,910 Pa

T1 = (50 + 273.15) K = 323.15 K

T2 = (30 + 273.15) K = 303.15 K

P2 = (70,910 Pa) x (303.15 K / 323.15 K) = 65,688 Pa

Therefore, the pressure at a temperature of 30°C while keeping the volume constant would be 65,688 Pa, which is equivalent to 657 mm Hg.

Since the volume is constant in this case, we can see that the pressure is directly proportional to the temperature. Therefore, if we decrease the temperature by 20°C, the pressure will also decrease by a factor of (T2/T1)(1-γ), where γ is the adiabatic index of the gas. In reality, the pressure will not decrease exactly as calculated using the Ideal Gas Law, since the gas is not an ideal gas and the volume may not remain constant. However, the Ideal Gas Law provides a useful approximation in many situations.

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Answer:

The relationship between light and matter produces three phenomena, namely:

Explanation:

In everyday use, reflective materials are used on construction apparel, handheld electric torch, headlamp of vehicles etc.

     2. Absorption:  When matter captures electromagnetic radiation, it converts the energy of photons into internal energy and absorption is said to have taken place.  

Light absorption by the chlorophyll in plants for use in production is an example of how humans use light absorption albeit indirectly.

     3.  Transmission        

When matter is transparent or semi-transparent it allows light to pass through. For semi-transparent matter, some of the light is absorbed.

Transmission of light is used predominantly in various kinds of lighting effects for interior decoration and houses.

     4. Emission

When matter releases energy as light, it is said to have emitted light.

Examples of everyday emission of light include Light Emitting Diode which is used in remote controls.

Cheers!

The charge of the test charge is 5e-10 C.

To find the charge of the test charge, we can use the formula for the force exerted on a test charge by an electric field:

F = q * E

Where:

F is the force exerted on the test charge

q is the charge of the test charge

E is the strength of the electric field

We are given:

F = 4.095e-5 N (force)

E = 8.18e4 N/C (electric field strength)

Substituting the values into the formula, we can solve for q:

4.095e-5 N = q * 8.18e4 N/C

Divide both sides of the equation by 8.18e4 N/C:

q = (4.095e-5 N) / (8.18e4 N/C)

Simplifying the expression:

q = 5e-10 C

Therefore, the charge of the test charge is 5e-10 C.

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Answer:

\(0.361\ \text{m}\)

Explanation:

\(f_s\) = Frequency of source = 375 Hz

\(\Delta f\) = Difference between the maximum and minimum sound frequencies = 2.75 Hz

v = Speed of sound in air = 343 m/s

T = Time period = 1.8 s

\(v_m\) = Maximum speed of the microphone

We have the relation

\(\Delta f=2f_s\dfrac{v_m}{v}\\\Rightarrow v_m=\dfrac{\Delta fv}{2f_s}\\\Rightarrow v_m=\dfrac{2.75\times 343}{2\times 375}\\\Rightarrow v_m=1.26\ \text{m/s}\)

Amplitude is given by

\(A=\dfrac{v_mT}{2\pi}\\\Rightarrow A=\dfrac{1.26\times 1.8}{2\pi}\\\Rightarrow A=0.361\ \text{m}\)

The amplitude of the simple harmonic motion is \(0.361\ \text{m}\).

The potential energy gained by the charge is 250 J (joules).

The potential energy (PE) gained by a charge moving through an electric field can be calculated using the formula PE = q × ΔV, where q is the charge and ΔV is the potential difference (electric potential) through which the charge is moved.

In this case, the charge is 5 C (coulombs) and the electric field strength is 10 N/C (newtons per coulomb). The potential difference can be calculated using the formula ΔV = E × d, where E is the electric field strength and d is the distance moved.

Substituting the given values, we have ΔV = (10 N/C) × (5 m) = 50 V (volts).

Finally, we can calculate the potential energy gained by multiplying the charge (5 C) by the potential difference (50 V):

PE = (5 C) × (50 V) = 250 J (joules).

Therefore, the potential energy gained by the charge is 250 J.

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Answer:

→They are the followings :

This are some points that teacher should have mentally.

Answer:

1. BASKETBALL

A team sport that is placed in an indoor basketball court between two teams.

2. SOFTBALL

A team sport plays in an outdoor stadium or ground. It is similar to a baseball game.

3. COURT

A court is a place where any indoor game or team sport takes place.

4. REFEREE

A referee is a person or official that watches a game closely and decides if the game is played with rules or not.

5. UMPIRE

An umpire is a field official to look after the game to see if everything is according to the rules.

6. TRAVELLING

7. VOLLEYBALL

It is also team game plays in open field or beach between two teams where a net is placed between the teams.

8. FOUL

Foul is a penalty for breaking the rule of the game decides by umpire or refree.

9. INNING

An inning is the part of the game which is played by one of the team

10. SHOOTING

Explanation:

light waves because the categorised under mechanical waves

Answer:

Neither of the two options.

Explanation:

Before a bullet is fired, the momentum of the bullet-gun system is zero because of lack of velocity. After the gun is fired, both gun and bullet acquire velocity making them nonzero. Thus, it is impossible for the kinetic energy to be zero because both the bullet and the gun are in motion. Also, the momentum is nonzero momentum is the product of the mass of an object and its corresponding velocity. Once the bullet is fired, both the bullet and the gun gains momentum thus making it nonzero.

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