7th grade science i mark as brainliest ​

Answer:

you can view my profile and go to questions and answer the recent questions i posted

Explanation:

The magnitude of the electric field due to the particle at the given distance is [tex]9\times 10^9 q[/tex].

The electric field strength of a charged particle is the force per unit charge in the given field.

The electric field strength of a charge is given as;

[tex]E = \frac{F}{q} \\\\E = \frac{kq}{r^2}[/tex]

where;

[tex]E = \frac{9\times 10^9 \times q}{1^2} \\\\E = 9\times 10^9 q[/tex]

Thus, the magnitude of the electric field due to the particle at the given distance is [tex]9\times 10^9 q[/tex].

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Answer:

Salt water

Explanation:

This is the answer

Answer:

chemical energy

Explanation:

hope this helps

Answer:

its inertia.

Inertia is the tendency of an object to continue in the state of rest or of uniform motion

The amount of energy needed to change 25 g of −30°C ice into 0°C liquid water is 8350 J.

The amount of heat required to change 25 g of −30°C ice into 0°C liquid water is calculated as follows;

Q = mLf

where;

Q =  25 x 334

Q =  8350

Thus, the amount of energy needed to change 25 g of −30°C ice into 0°C liquid water is 8350 J.

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Answer:

The amount of energy needed to change 25 g of −30°C ice into 0°C liquid water is 9,887.5 J.

you produce about 20 W

Explanation:

Determine the time in which the work will be done. Here, we can take t = 60 s . Power is equal to work divided by time. In this example, P = 9000 J / 60 s = 150 W(example)

Answer:

Explanation:

To determine the power (or rate of work) produced, we can use the formula:

Power = Work / Time

Where:

Work = 140 J (joules)

Time = 7 seconds

So, we can plug in the values into the formula:

Power = 140 J / 7 s = 20 W (watts)

So, you produced 20 watts of power in 7 seconds.

It's important to note that work and power are different physical quantities. Work represents the amount of energy transferred, while power represents the rate at which that energy is transferred.

Answer:

The acceleration of an item is proportional to the net force exerted on it and inversely proportional to its mass. When the force pushing on an item rises, so does the object's acceleration. The acceleration of an item decreases as the mass of the thing increases.

If the force on an object remains constant, increasing mass will decrease acceleration. In other words, force and acceleration are directly proportional, while mass and acceleration are inversely proportional. ( How Newton's Laws of Motion Work" 29 July 2008.)

If the mass of an object is held constant, increasing force will increase acceleration. If the force on an object remains constant, increasing mass will decrease acceleration.

This net force is the resultant force of all forces acting on the body at any given instant. The larger the magnitude of this net force, the larger the acceleration of the body. One of the definitions of mass is the resistance of a body to motion in general and acceleration in particular due to the application of force.

Explanation:

Answer:

the answer is b because an object in motion stays in motion

The water likely spilled because of inertia of motion such that an object in motion tends to stay in motion. So, option B is correct.

Inertia is defined as the property of matter by which it tends to continue its state of rest or uniform motion.

Here,

When you are travelling in a car, holding a cup of water in one hand and the driver of the car is forced to stop suddenly so that the water in the cup gets spilled out.

When the car was moving, the water in the cup was actually at the same speed relative to the car and cup. When the car is tend to stop suddenly, this causes a sudden change in acceleration of the car and thus the cup. As a result, the water in the cup spills out. This is due to the property of inertia that the water got spilled out.

According to the law of inertia, a body will preserve its state of rest or uniform motion unless an external force acts on it.

Here, the spilling out of water is the application of inertia of motion. That means the the water inside the cup which was moving forward and when the change in acceleration occurred, it got spilled in front of you thus tending to continue its state of motion.

Hence,

The water likely spilled because of inertia of motion such that an object in motion tends to stay in motion.

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Answer:

A. put water in a container under the pot water will disappear from the container .

Answer:

0.072, 0.062, 0

Explanation:

Flux = magnetic field B * area A * cos(angle between B and normal of A)

= 1.25 * 0.24^2 * cos(angle) = 0.072 * cos(angle)

a) angle = 0°, flux = 0.072 Wb

b) angle = 30°, flux = 0.072*cos(30) = 0.062 Wb.

c) angle = 90°, flux = 0

(a) The time taken for the ball to reach the height of the fence is 4.1 s.

(b) The position of the ball from the batter at the time is 111.33 m.

(c) Henry will have a home run.

The time taken for the ball to reach the height of the fence is calculated as follows;

[tex]h = v_0_y t - \frac{1}{2} gt^2\\\\(3 - 1.2) = (34 \times sin37)t - \frac{1}{2} (9.8)t^2\\\\1.8 = 20.46t- 4.9t^2\\\\4.9t^2 - 20.46t+ 1.8 = 0\\\\a = 4.9, \ b = -20.46, \ c = 1.8\\\\t = \frac{-b\pm \sqrt{b^2 - 4ac} }{2a} \\\\t = 4.1 \ s[/tex]

The position of the ball at the time is calculated as follows;

[tex]X = v_x t\\\\X = (34 \times cos37) \times 4.1\\\\X = 111.33 \ m[/tex]

Since, 111.33 m is greater than 106 m, Henry will have a home run.

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Answer:

im pretty sure its D

Explanation:

Answer:

D

Explanation:

Heat will flow from object B to object A

Answer:

0.0519480519 A

Explanation:

First find equivalent resistance:

R series = R1 + R2 + R3 ...

[tex]R_{eq} = 160+100+82+120=462ohms[/tex]

Now calculate current:

V = IR

[tex]I = \frac{V}{R}[/tex]

[tex]I= \frac{24}{462} = 0.0519480519 A[/tex]

Answer:

*Good luck!

Answer:

well if it wasn't shot then it shouldn't have been affected

Explanation:

Answer:

A lunar eclipse occurs when the Moon enters the Earth’s shadow. A solar eclipse occurs when the Moon’s shadow falls on the Earth. They do not happen every month because the Earth’s orbit around the sun is not in the same plane as the Moon’s orbit around the Earth.

Explanation:

Answer:

a variable (often denoted by x) whose variation does not depend on that of another.

Explanation:

The charge on the capacitor 2 (C₂) is 48μF.

In the circuit diagram, C₁ and C₂ are in series connection, while C₃ is parallel to C₁ and C₂.

[tex]Q_1 = Q_2 = Q\\\\V = \frac{Q}{C_1} + \frac{Q}{C_2} \\\\V = Q(\frac{1}{C_1} + \frac{1}{C_2} )\\\\Q = V (\frac{C_1C_2}{C_1 + C_2} )\\\\Q = 24 \times (\frac{6 \times 10^{-6} \times 3 \times 10^{-6}}{6\times 10^{-6} \ + \ 3 \times 10^{-6}} )\\\\Q = \frac{4.32 \times 10^{-10}}{9\times 10^{-6}} \\\\Q = 48 \ \mu C[/tex]

Thus, the charge on the capacitor 2 (C₂) is 48μF.

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Answer:

I think c

Explanation:

cold air pushes warm air up and then the air mixes(im not sure)

When the force is applied normal to the circumference at point P, then it's zero.

It should be noted that force simply means an influence that can change the position of an object.

In this case, when the force is applied normal to the circumference at point P, then it's zero.

Also, if the force is applied normal to the circumference at point X, then it's constant.

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The horizontal force needed to keep the same box sliding on the same horizontal floor at a given constant speed is 45 N.

The horizontal force needed to keep the same box sliding on the same horizontal floor at a given constant speed is calculated as follows;

[tex]F= \frac{mv}{t} \\\\mv = Ft\\\\m = \frac{Ft}{v} \\\\\frac{F_1}{v_1} = \frac{F_2}{v_2}[/tex]

where;

[tex]F_2 = \frac{F_1v_2}{v_1} \\\\F_2 = \frac{15 \times 1.5}{0.5} \\\\F_2 = 45 \ N[/tex]

Thus, the horizontal force needed to keep the same box sliding on the same horizontal floor at a given constant speed is 45 N.

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Answer:

1/2mv²=0

1/2(4kg)(v²)=0

2=-v²

square root -2=v

v=1.414

Block A of mass 1 kg and block B has a mass of 3 kg, then the blocks collide and stick together so the kinetic energy of block A is one-third of the kinetic energy of the block.

Kinetic energy is a type of power that an item or particle possesses as a result of motion. When an item undergoes work—the transfer of energy—by having subject to a net force, it accelerates and consequently obtains kinetic energy. An object in motion or particle's kinetic energy, which depends on both mass and speed, is one of its features. Any combination of motions, including translation, rotation about an axis, and vibration, may be used as the type of motion.

A body's translational kinetic energy is equal to 1/2mv², or one-half of the sum of its mass, m, and the square of its velocity, v.

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This is the correct answer

The  magnitude of the electric field strength at that position  is 2.6×10⁴ Newton/Coulomb.

An electric field is a physical field that surrounds electrically charged particles and acts as an attractor or repellent to all other charged particles in the vicinity. It can also refer to a system of charged particles' physical field. Electric charges and time-varying electric currents are the building blocks of electric fields.

Given parameters:

Charge of the point charge: Q = 4.2 × 10⁻⁶ Coulomb.

Distance of the position from the position: r = 1.2 meter.

The  magnitude of the electric field strength at that position = kQ/r²

= 9 × 10⁹ × 4.2×10⁻⁶/(1.2)² Newton/coulomb.

= 2.6×10⁴ Newton/Coulomb.

Hence, the  magnitude of the electric field strength at that position  is 2.6×10⁴ Newton/Coulomb.

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Explanation:

The forces acting on the rock include Normal Force, Gravitational force & Friction force

It's possible for it to stay on the boulder because the normal force balances it's weight. also because static friction acts on the boulder up to it's limiting friction even if it were on an attempt to move as a result of air resistance. gravitational forces act upon it by mainly affecting it it's weight. as altitude increases, it's weight decreases since gravity varies from a height to another.

final speed will be 25.98 m/s Explanation Force applied by the engine on the car is  We have to find final speed of the car after travelling 300 m , so displacement of car is given as  so wor done by the engines on the car

Answer:

[tex]F=ma \\ 900 = 1200a \\ a = \frac{3}{4} m. {s}^{ - 2} \\ {v}^{2} = {u}^{2} +2 as \\ {v}^{2} = {(15)}^{2} + 2( \frac{3}{4} )(300) \\ = 675 \\ v = \sqrt{675} \: m. {s}^{ - 1} [/tex]

Answer:

the water will float over mercury and the steel ball will be in it's respected place