Can you help me on this? it is a phyisical science question.

Answer:

The sign of charge q is negative.

Explanation:

This is because electric field lines usually emanate from positive charges and terminate at negative charges. The negative charge in the hollow cavity induces a positive charge on the inner shell wall of the hollow shell which in turn induces the negative charge q on the hollow spherical shell.

Since the induced electric charge on the inner wall is positive, the electric field lines from that charge terminates at the inner charge q. Since electric field lines terminate only at negative charges, q is negative.

The person above me is an idiot

Answer:

The correct answer is 10

Explanation:

10 times the singular magnesium which means: 10 times 1

There are 10 magnesium atoms in 10 MgCl₂ as depicted in the chemical formula.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

The acceleration of the ball from 0.5 to 0.7 seconds is 10 m/s²

Explanation:

The data from the given velocity-time graph are as follows;

Velocity (meters per second)       [tex]{}[/tex]                       Time (seconds)

0                                                    [tex]{}[/tex]                          0.4

0.5                                                   [tex]{}[/tex]                        0.45

1.                                                 [tex]{}[/tex]                             0.5

1.5                                                   [tex]{}[/tex]                         0.55

2.2                                                   [tex]{}[/tex]                        0.6

2.5                                                   [tex]{}[/tex]                        0.65

3.0                                                   [tex]{}[/tex]                        0.7

3.5                                                   [tex]{}[/tex]                        0.75

4.0                                                   [tex]{}[/tex]                        0.8

4.5                                                   [tex]{}[/tex]                        0.85

Therefore, the average acceleration of the ball from 0.7 to 0.7 seconds is given as follows;

Acceleration = (Change in velocity)/(Related change in time)

Acceleration = (3.0 - 1)m/s/(0.7 - 0.5)s = 2/0.2 m/s²  = 10 m/s²

The acceleration of the ball from 0.5 to 0.7 seconds = 10 m/s².

Answer:

There would be 9 b/c there is so many hours of school and the homework depends on how old you are so i am pretty sure it is C.

Explanation:

Answer:

28 seconds.

Explanation:

Apply the first equation of motion as;

v=u +at where;

v= final velocity of the plane = 70m/s

u=initial velocity of the plane= 0m/s -----it was at rest

a= acceleration uniform =2.5 m/s²

t= time required for takeoff = ?

Substitute values in the equation as;

v= u + at

70 = 0 + 2.5*t

70 = 2.5t

70/2.5 = 2.5/2.5t

28 = t

Time required for takeoff is 28 seconds.

Answer:

490m

Explanation:

Given parameters:

     Time taken = 10s

Unknown:

Depth of the well = ?

Solution:

To find the depth of the well, we apply the appropriate motion equation:

     h = ut + [tex]\frac{1}{2}[/tex]gt²

h is the depth

u is the initial velocity

g is the acceleration due to gravity  = 9.8m/s²

t is the time taken

 Input the parameters and solve;

 The ball was dropped from rest; u = 0

      h  =  [tex]\frac{1}{2}[/tex]gt²

      h  =   [tex]\frac{1}{2}[/tex] x 9.8 x 10²  = 490m

Answer:

benefits

Diversifying energy supply and reducing dependence on imported fuels.

Creating economic development and jobs in manufacturing, installation, and more.

drawbacks

Large areas of landfill are required

Hydroelectric power is generated from flowing water, which turns turbines and generates electricity

Explanation:

Answer:

The answer is A) True

Explanation:

Uranium is the fuel most widely used by nuclear plants for nuclear fission. Uranium is considered a nonrenewable energy source, even though it is a common metal found in rocks worldwide. Nuclear power plants use a certain kind of uranium, referred to as U-235, for fuel because its atoms are easily split apart.

Answer: Explanation:

Balloons are elastic and store potential energy when they are filled with air. When the air is released, the potential energy is converted into the energy of motion, which is also known as kinetic energy. This is the energy you see when the car is propelled forward.

solution

Given

mass= 20kg

velocity =3m/s

K.E=?

K.E= ½mv²

½×20×3²

½×20×9

½×180

90 J

Answer:

Sagittarius A

At its center, surrounded by 200-400 billion stars and undetectable to the human eye and by direct measurements, lies a supermassive black hole called Sagittarius A*, or Sgr A* for short. The Milky Way has the shape of a spiral and rotates around its center, with long curling arms surrounding a slightly bulging disk.

Explanation:

Answer:

black hole is the answer

Explanation:

Answer:

2

Explanation:

Answer:

jo

Explanation:

kkk kkk

Answer: C. Trial 3

Explanation:

Trial 1 and 2 equal 1.5, Trial 3 equals 1 and Trial 4 equals 3. Trial 3 is the smallest current .

The trial for which the students would measure the smallest current is the circuit is trial 2 and trial 3.

To know the trial which generates the smallest current, we need to determine the current in each trial.

Since current I = V/R where V = voltage and R = resistance.

For trial 1, V = 1.5 V and R = 200 Ω

So, I = 1.5 V/200 Ω

= 0.0075 A

= 7.5 mA

For trial 2, V = 1.5 V and R = 100 Ω

So, I = 1.5 V/100 Ω

= 0.015 A

= 15 mA

For trial 3, V = 3 V and R = 200 Ω

So, I = 3 V/200 Ω

= 0.015 A

= 15 mA

For trial 4, V = 3 V and R = 100 Ω

So, I = 3 V/100 Ω

= 0.03 A

= 3 mA

Trial 2 and trial 3 both produce a the smallest current of 15 mA.

So, the trial for which the students would measure the smallest current is the circuit is trial 2 and trial 3.

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Answer:

I think because of sun is made from very hot gases

Answer:

246.38N

Explanation:

Check the complete question in the attached diagram

The normal force acting on the body on an inclined is equal to the weight of the object as shown;

Weight = Normal force = mgcosθ

m is the mass of the box = 29kg

g is the acceleration due to gravity = 9.81m/s²

θ is the angle of inclination = 30°

N = 29 * 9.81 * cos 30°

N = 284.49cos30°

N = 246.38N

Hence the magnitude of the normal force is 246.38N

Answer:

The mass number of an atom is its total number of protons and neutrons. Atoms of different elements usually have different mass numbers , but they can be the same. For example, the mass number of argon atoms and calcium atoms can both be 40.

Explanation:

Please mark as brainliest

Answer:

Explanation:

atomic mass

Explanation:

Use the equation F=m×a

F= 1500 N

M= 500kg

a= F/M

a= 1500÷ 500

a= 3m/s^2

Answer:

Explanation:

Force, f = 1500 N

Mass, m = 500 kg

Acceleration, a = ?

f = ma

a = f/m

= 1500 / 500 = 3m/s^2

Hope this helps

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The ball rolled for 13.2 s

Speed is scalar and no direction

[tex]\tt avg~speed=\dfrac{total~distance}{elapsed~time}=\dfrac{\Delta x}{\Delta t}[/tex]

A bowling ball rolls 33 m, with average speed = 2.5 m/s

So elapsed time :

[tex]\tt t=\dfrac{33~m}{2.5`m/s}=13.2~s[/tex]

Answer:

13.2

Explanation:

Answer:

Explanation:

Time of fall be t

Considering downward fall

h = 1/2 g t²

.8 = .5 x 9.8 t²

t² = .16

t = .4 s

Marble lands at .6 m away from the base

If u be its horizontal initial velocity

u x .4 = .6

u = 1.5 m /s .

The initial velocity of the marble will be "1.5 m/s".

According to the question,

Height of table, h = 0.8 m

Marble lands = 0.6 m

Acceleration due to gravity, g = 9.8

Let,

The time of fall be "t".

We know the relation,

→ h = [tex]\frac{1}{2} gt^2[/tex]

By substituting the values, we get

0.8 = 0.5 × 9.8 t²

  t² = 0.16

    t = √0.16

      = 0.4 s

hence,

The horizontal initial velocity will be:

→ u × 0.4 = 0.6

            u = [tex]\frac{0.6}{0.4}[/tex]

               = 1.5 m/s

Thus the answer above is appropriate.    

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Answer:

.................... protons :)

Answer:

protons

The two subatomic particles that have the same mass are protons and neutrons.

Answer:

Not 500 points I got 18 but thx

Explanation:

Answer:

a

Explanation:

Answer:

Acceleration, a = 9.877m/s²

Explanation:

Given the following data;

Distance, d = 400m

Time, t = 9secs

Since it's starting from rest, initial velocity, u = 0

To solve for acceleration, we would use the second equation of motion;

[tex] S = ut + \frac {1}{2}at^{2}[/tex]

Substituting into the values into the equation;

[tex] 400 = 0(9) + \frac {1}{2}a(9)^{2}[/tex]

[tex] 400 = \frac {1}{2}a81[/tex]

Cross multiplying, we have;

[tex] 800 = a81[/tex]

[tex] a = \frac {800}{81}[/tex]

a = 9.877m/s²

Therefore, the automobile would have to accelerate at a constant rate of 9.877m/s²

Electricity needs a path to follow to get from one destination to another. And the journey is always the same: Power – Electricity always starts from a source, like a battery or an outlet.

"A battery is a device that converts chemical energy contained within its active materials directly into electric energy by means of an electrochemical oxidation-reduction (redox) reaction. This type of reaction involves the transfer of electrons from one material to another via an electric circuit."

"In electronics, a circuit is a complete circular path that electricity flows through. A simple circuit consists of a current source, conductors and a load. The term circuit can be used in a general sense to refer to any fixed path that electricity, data or a signal can travel through."

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Answer:

pluto.... even tho they dont consider it a planet but it's a dwarf planet

Answer:

Option C. 0.51 m/s² to the right.

Explanation:

We'll begin by calculating the net force acting on the skateboarder. This is illustrated below:

Force applied (Fₐ) = 52.8 N

Force resistance (Fᵣ) = 11.4 N

Net force (Fₙ) =.?

Net force (Fₙ) = Force applied (Fₐ) – Force resistance (Fᵣ)

Fₙ = Fₐ – Fᵣ

Fₙ = 52.8 – 11.4

Fₙ = 41.4 N to the right

Thus, the net force acting on the skateboarder is 41.4 N to the right.

Finally, we shall determine the acceleration of the skateboarder as shown below:

Mass (m) = 81.5 kg.

Net force (Fₙ) = 41.4 N to the right

Acceleration (a) =..?

Net force (Fₙ) = mass (m) × acceleration (a)

Fₙ = ma

41.4 = 81.5 × a

Divide both side by 81.5

a = 41.4 / 81.5

a = 0.51 m/s² to the right.

Therefore, the acceleration of the skateboarder is 0.51 m/s² to the right.

Answer: .5 m/s to right

Explanation: