Derase
An electric heater Consumes 1.8 MJ When connected to a 250V supply for 30 minutes. Find the power rating of the heater and the current taken from the supply
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The instantaneous current at the same moment in the RL circuit can be expressed as I = Imaxsin(150), where Imax represents the maximum current.

1. Given that the instantaneous voltage at a specific moment in the RL circuit is V = Vmaxsin(150).

2. We can express the current at the same moment using Ohm's Law, which states that V = IR, where V is voltage, I is current, and R is resistance.

3. In an RL circuit, the resistance is represented by the symbol R, and it is typically associated with the resistance of the wire or any resistors in the circuit.

4. However, the given equation does not explicitly mention resistance.

5. Since we are considering an RL circuit, it suggests the presence of inductance (L) along with resistance (R).

6. In an RL circuit, the voltage across the inductor (VL) can be expressed as VL = L(di/dt), where L is the inductance and di/dt represents the rate of change of current.

7. At any given instant, the total voltage across the circuit (V) can be expressed as the sum of the voltage across the resistor (VR) and the voltage across the inductor (VL).

8. Therefore, V = VR + VL.

9. Since the given equation represents the instantaneous voltage (V), we can deduce that V = VR.

10. By comparing V = VR with Ohm's Law (V = IR), we can conclude that I = Imaxsin(150), where Imax represents the maximum current.

The specific values of Vmax, Imax, and the phase angle have not been provided in the question, so we are working with the general expression.

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Constructive forces in volcanoes: volcanic activity form mountains and land over time. Magma is hot molten rock within the volcano. Lava flows from the volcano on Earth's surface. It cools to form igneous rock.

The three examples of constructive force are deposition, volcanoes, and crust deformation. The crust deformation creates hills and valleys through folding.

Constructive forces are the forces that tend to build up new landforms. These forces also help to add new features to the landmasses that are already present on the earth.

Volcanoes are one of the most prominent examples of constructive forces. The process of volcanic eruption involves the driving and deposition of matter from the inner side of the earth to the exterior of the earth's surface.

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Answer:

P = 23400 [kg*m/s]

Explanation:

Momentum is defined as the product of force by the time of force duration. It can be determined by means of the following equation.

\(P=F*t\)

where:

P = momentum [kg*m/s]

F = force = 2600 [N]

t = time = 9 [s]

Now replacing:

\(P=2600*9\\P=23400 [kg*m/s]\)

There will be exchange of heat in the system, the tub filled with ice will gain heat, while the bottle of liquid will lose heat.

The flow is made possible by means of convection which implies heat flow from region of higher concentration to region of low concentration

by actual movement of material particles

There are basically three modes of heat transfer

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Explanation:

if you go to connexus and are doing the science

Thermal Energy Unit Test 10 qestions 8th grd unit 5 test lesson 12 here are the correct answers

1. A. metal is heated from room temperature to 200'C.

2. B. The particles will have more space between them as steam, but they will be moving at the same speed in both states.

3. C. The potential energy decreases due to the tighter arrangement of the particles.

4. B. an increase in heat and an increase in kinetic energy until a phase change occurs.

5. C. thermometer

6. B. 4.

7. D. convection

8. C. Air moves from the areas of higher temperature to areas of lower temperature.

9. C. The temperature of the ice increases, while the temperature of the water decreases

10. A. heat transfer by radiation.

i hope this helps and please let me know if it does! = ) <3

This is trying to show you that if you know the rules of the code, you can figure out the whole message from only having a part of it.

In this picture, the rules of the code are how the letters are formed.

This is an important concept for communication.  It's related to the questions of

. . . Can you understand a person on the phone if there's also static or noise mixed with his voice ?

. . . Can you accurately decode a digital message made of 1's and zeroes, even if some of them are missing, or got reversed on the way to you ?

The answer to both of these questions is 'Yes, you can.  If you have ENOUGH of the message, you can fill in the missing parts.'.

In this case, I hate to say it, but I don't think the question gives us enough of the message for us to be able to fill in the missing part.  Maybe some people can look at this and understand what it says, but I can't.

To show you a better example of how you can fill in the whole message when part of it is missing, I made my own, and it's attached to this answer.  

Answer:

B. 10 cm

x^3 = 1 L

1 L = 1000 cm^3 (since 1 L = 1000 cm^3)

x^3 = 1000 cm^3

so we will use Newton's gravitational law :

gravitational acceleration = G*m/r^2  

G is the gravitational constant = G = 6.673×10^-11 N m^2 kg^-2  

after substitution :  

6.673×10^-11 * m / (1.15 x 10^6)^2 = 0.61

= 5.04575*10^-23 * m = 0.61

dividing over 5.04575*10^-23 :

m = 1.20894*10^22 kg

pls give me brainliest

Answer:

A. The rays can change molecules and atoms in the body into ions.

This question involves the concepts of thickness and length.

"40" gold atoms could stack on top of one another in the gold foil.

We will use the unitary method here to find out the no. of gold atoms that could stack on top of each other in the gold foil of thickness 1 x 10⁻⁷ m, when the side length of each cubic atom is 2.5 x 10⁻⁹ m.

Therefore,

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The speed of the artillery shell when it hits its target is 100 m/s.

Given:

Initial vertical displacement (y) = 200 m

Vertical displacement at 100 m in the air (y') = 100 m

Final velocity in the vertical direction (vy') = 0 m/s (at the highest point of the trajectory)

Using the equation for vertical displacement in projectile motion:

y' = vy^2 / (2g),

where g is the acceleration due to gravity (approximately 9.8 m/s^2), we can solve for the initial vertical velocity (vy).

100 m = vy^2 / (2 * 9.8 m/s^2),

vy^2 = 100 m * 2 * 9.8 m/s^2,

vy^2 = 1960 m^2/s^2,

vy = sqrt(1960) m/s,

vy ≈ 44.27 m/s.

Now, since the horizontal motion is independent of the vertical motion, the horizontal speed of the shell remains constant throughout its trajectory. Therefore, the speed of the shell when it hits its target is 100 m/s.

Hence, the speed of the artillery shell when it hits its target is 100 m/s.

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Drawing the vectors, we have:

Now, calculating the components of each vector:

Answer:

im just so focused on the fact that im going to mars :O

Answer:

1&2

Explanation:

the mass makes the pull of gravity greater

Answer:

the answer is gravity

Explanation:

Answer:

Lx W

Explanation:

Answer:

Hi there!

Your answer is:

A. Linear

Explanation:

Linear measurement is when you measure things in a straight line using tools such as a ruler, yardstick or tape measure. To measure height, they are using a ruler, which is a form of linear measurement!

I hope this helps!

The process by which cells differentiate into different types of tissue, such as muscle or bone, is complex and involves various genetic and environmental factors.

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Answer:

8 m/s to the left.

Explanation:

Applying,

V = d/t...................... Equation 1

Where V = Velocity of the car, d = distance, t = time

From the question,

Given: d = 24 meters, t = 3 seconds

Substitute these values into equation 1

V = 24/3

V = 8 m/s to the left.

Hence the velocity of the car is 8 m/s to the left.

Answer:

F = 233.52 N,  θ' = 351.41º

Explanation:

In this exercise we must find the net force applied on the donkey.

For this we use Newton's second law, where we create a reference frame with the horizontal x axis

let's decompose the forces

Jack

        = 80.5 N

Jill

       cos 45 = F_{2x} / F₂2

       sin 45 = F_{2y} / F₂2

       F_{2x} = F₂ cos 45

       F_{2y} = F₂ sin 45

       F_{2x} = 81.7 cos 45 = 57.77 N

       F_{2y} = 81.7 sin 45 = 57.77 N

Jane

      cos (270 + 45) = F_{3x} / F₃3

      sin 315 = F_{3y} / F₃

      F_{3x} = 131 cos 315 = 92.63 N

      F_{3y} = 131 sin 315 = -92.63 N

the force can be found in each axis

X axis

         F_{x} = F_{1x} + F_{2x} + F_{3x}

         F_{x} = 80.5 +57.77 + 92.63

         F_{x} = 230.9 N

Axis y

         F_{y} = F_{1y} + F_{2y} + F_{3y}

         F_{y} = 0 + 57.77 -92.63

         F_{y} = -34.86 N

we can give the result in two ways

a) F = (230.9 i ^ - 34.86 j ^) N

b) in the form of module and angle

we use the Pythagorean theorem

         F = √(Fₓ² + F_{y}²

        F = √(230.9² + 34.86²)

        F = 233.52 N

let's use trigonometry for the angle

        tan θ = \(\frac{F_y}{F_x} }\)

        θ = tan⁻¹ (\frac{F_y}{F_x} })

        θ = tan⁻¹ (-34.86 / 230.9)

        θ = -8.59º

if we measure this angle from the positive side of the x-axis counterclockwise

          θ' = 360 -θ

          θ‘= 360- 8.59

          θ' = 351.41º

Objective observations do not include bias or opinions.

Observations can capture a child's strengths and weaknesses

This refers to the types of observation that is done through the senses through what we see, touch, feel, hear, smell, and taste.

Hence, we can see that objective observation is important because they provide insight into the strengths and needs of a child.

One of the ways you can capture your observations is through note-taking.

The federal law which ensures that all children and family education information is confidential is called The Family Educational Rights and Privacy Act (FERPA)

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Taking into account the Newton's second law, the acceleration of the object is 5 m/s².

Newton's second law states that this force will change the speed of an object because the speed and/or direction will change and these are called acceleration.

Newton's second law states that: "The acceleration of an object is directly proportional to the force acting on it and inversely proportional to the mass."

Mathematically, Newton's second law is expressed as:

F= m×a

where:

In this case, you know:

Replacing in the definition of Newton's second law:

200 N= 40 kg× a

Solving:

a= 200 N÷40 kg

a= 5 m/s²

Finally, the acceleration is 5 m/s².

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Answer:

50

Explanation:

500/10 = 50

Answer:

a. 3 seconds

b. 0.33 Hz

Explanation:

a. Period is defined by how long, in seconds, it takes for an object to complete one revolution, or cycle. If the object completes 50 cycles in 150 seconds, then it must complete one cycle every 150/50 = 3 seconds. Therefore, the period of the object is \(\boxed{3\text{ seconds}}\).

b. Frequency is given by \(f=\frac{1}{T}\) where \(T\) is the period, in seconds. Since we just found that the period is 3 seconds, plug in \(T=3\):

\(f=\frac{1}{3}\approx \boxed{0.33\text{ Hz}}\)

A lab group investigates the maximum weight students can lift with their arms compared to their legs. if their t' value was 0.35, there is difference between the arms and legs data. The correct option is (B).

Difference between the measured value and the targeted true value for the physical quantity?

Measurement error.

The appropriate response to the foregoing question is because_________

The disparity between means was larger than the total uncertainty.

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The complete question is:-

A lab group investigates the maximum weight students can lift with their arms compared to their legs. if their t' value was 0.35, which of the following conclusions would be justified?

a.)There is no significant difference between the arms and legs data.

b.)There is difference between the arms and legs data.

c.)It's unlikely difference between the arms and legs data.

d.)It's likely difference between the arms and legs data.

Answer: Limestone Caves

Explanation: The most common feature that can be caused purely by chemical weathering is Karst Landscape, which can lead to caverns and sinkholes.

Answer:

3.176hours

Explanation:

270/85=3.126 hours DISTANCE / SPEED = TIME

Answer:

Explanation:

ΔPE = mgΔh = 14(10)(1.8) = 252 J

Answer:

75mL

...............

The question is full of inconsistencies and conceptual errors. Students should not waste their time trying to answer it ... it will only mislead and confuse them.

The question is poor. It was written by someone unclear on the concepts. It should be ignored.