Can someone help me with this one :") thanks

2.75 m/s. Hope this helps.

Answer:

No, work isn't being done by Johnny.

Explanation:

Work can be defined as the energy transferred to a physical object by exertion of a force on the object to cause a displacement of the object. Thus, work is typically done when a person or simple machine move an object over a distance through the application of a force.

Mathematically, work done is given by the formula;

Work done = force * distance

[tex] W = F * d[/tex]

Where,

W is the work done

F represents the force acting on a body.

d represents the distance covered by the body.

In this scenario, Johnny's push didn't cause a displacement of the wall and as such no work is done.

Answer:

24 m/s²

Explanation:

The given parameters are;

The initial acceleration of the object, a = 16 m/s²

Let 'm' represent the initial mass of the object

The initial force acting on the object, F = m × a

∴ F = 16 × m = 16·m

When the mass is doubled, we have;

The new mass of the object, m₂ = 2 × m = 2·m

When the net force acting on the object triples, we have;

The new net force acting on the object, F₂ = 3 × F = 3 × 16·m = 48·m

From F = m × a, we have;

a = F/m

∴ The new acceleration of the object, a₂ = F₂/m₂

From which, by plugging in the values, we have;

a₂ = 48·m/(2·m) = 24

The new acceleration of the object, a₂ = 24 m/s².

Answer:

A

Explanation:

As u will divide the sound of air with The length which is also the alternative formula for calculating frequency

(a) 39 V

(b) 7.8 V

(a) Neglecting the internal resistance of the battery, the voltage drop (V) across the battery is found from Ohm's law as follows;

V = IR                -------------------------(i)

Where;

I = current through the battery

R = total resistance of the circuit.

From the question;

I = 0.75A

R = 52.0Ω

Substitute the values of I and R into equation (i)

=> V = 0.75 x 52.0

=> V = 39Volts

Therefore, the voltage drop across the battery is 39 Volts

(b) Since the set of lanterns is connected in series, then the same current flows through each of the lanterns. Also, since the lanterns are identical, the resistance ([tex]R_{L}[/tex]) of each of them is given by the total resistance (R = 52.0Ω) divided by the number of lanterns. i.e

[tex]R_{L}[/tex] = [tex]\frac{52.0}{5}[/tex]

[tex]R_{L}[/tex] = 10.4Ω          [Each lantern has a resistance of 10.4Ω]

The current flowing through them is the same as the current (I = 0.75A) flowing the circuit.

Therefore, using Ohm's law, the voltage drop ([tex]V_L[/tex])across each load (lantern) is

[tex]V_L[/tex] = I x [tex]R_{L}[/tex]

[tex]V_L[/tex] = 0.75 x 10.4

[tex]V_L[/tex] = 7.8Volts

Therefore, the voltage drop across each load is 7.8 Volts

Answer:

1.

a. T

b. F

c. T

d. F

e. T

2. Liquid, gas, solid

3. Water

4.

a. Solid

b. Gas

c. Water

5.

a. Add heat

b. Remove heat

c. Add heat

Answer:

Soluble - salt

Insoluble - sand and stapler pins

Explanation:

The salt is soluble because it is an ionic solid which ready dissolves in water to form a solution.

The sand is insoluble because, it is a non-metallic solid which does not readily dissolve in water while, the stapler pin is insoluble because it is a metallic solid which does not readily dissolve in water.

BLUEBLACK COLOR IS FORMED WHEN STARCH AND IODINE IS MIXED .

Answer:

mark me as the brainliest plss

Answer:

9.03 times 10times 23 calculate it and there ya go

Answer:

Ok.

Know this.

1 moles of a gas contains 6.022x10²³molecules.

Given: 48g of Oxygen gas.

Find the moles present

Mole = Mass/Molar Mass

Molar Mass of O2 = 16x2 =32g/mol

Mole = 48/32

=1.5moles of O2.

Recall

1 moles of gas contains 6.022x10²³molecules

1.5moles would contain

1.5 x 6.022x10²³molecules

=9.033 x 10²³ molecules of Oxygen gas.

Have a great day!

Answer:

[tex]{ \tt{volume = \pi {r}^{2} h}}[/tex]

Explanation:

4) The net torque on the on the meter stick is equal to zero in order to have no rotation.

[tex]\tau_{1} = \tau_{2}[/tex]

[tex]F_{1}d_{1} = F_{2}d_{2}[/tex]

[tex](8 \:N)(0.3\: m) = F_{2}(0.1 \:m)[/tex]

[tex]F_{2} = \frac{(8 \:N)(0.3 \:m)}{(0.1 \:m)} = 24 \:N[/tex]

5) We are going the same equations in #4 here.

[tex]F_{1}d_{1} = F_{2}d_{2}[/tex]

[tex](500 \:N)(2.4 \:m) = F_{2}(3.0 \:m)[/tex]

[tex]F_{2} = \frac{(500 \:N)(2.4 \:m)}{(3.0 \:m)} = 400 \:N[/tex]

Answer:

90.8%

Explanation:

efficiency = output / input

Simply just put in what we know.

386/425 = 0.908 (Rounded too 3 s.f)

And if you want this in percentage, you simply x100 your answer. Hence the answer being 90.8%

Answer:

1) vitamins

2) Meat, eggs, liver

Explanation:

1) Low levels (deficiency) in vitamins such a vitamin B12 and vitamin D can lead to tiredness.

Vitamin B12 is one of the most important nutrients for energy because it helps the blood, digestive system, brain and nervous system. Vitamin D is necessary for bone health and good immune function.

2) To prevent deficiency in vitamins, foods such as beef, eggs, liver, fish can be eaten. Also, supplements such as B-complex vitamin can be taken.

Answer:

Option D. ²³⁹₉₃Np

Explanation:

Let the unknown be ʸₓA.

Thus, the equation becomes:

²³⁹₉₂U —> ⁰₋₁e + ʸₓA

Next, we shall determine the x, y and A. This can be obtained as follow:

92 = –1 + x

Collect like terms

92 + 1 = x

93 = x

x = 93

239 = 0 + y

239 = y

y = 239

ʸₓA => ²³⁹₉₃A => ²³⁹₉₃Np

Thus, the complete equation is:

²³⁹₉₂U —> ⁰₋₁e + ²³⁹₉₃Np

Answer:

C is the correct answer.

Answer:

Quick, Efficient, Reliable, Safe and Continous

Answer:

Five advantages of electricity are :Advantages

It is transportable over long distances

It is silent

It can be used produce magnetic fields, which can be used to propel motors

It is very transformable

It is very fast, virtually the speed of light

It can be used to produce other forms of radiant energy, such as radio waves, microwaves, radiant heat and light

Answer:

-It holds people's belongings tight to Earth's surface

-it helps cool Earth's surface

- it keeps the solar wind from reaching earth

Answer:

Eletromagnetic radiation which is also known as visible light.

Explanation:

Answer:

Gamma Ray's as they have the shortest wavelength and highest frequency in the electromagnetic Spectrum.

Answer:

[tex](a)\\1.97\times 10^8 m/s\\(b)\\1.99\times 10^8 m/s \\(c)\\2.21 \times 10^8 m/s[/tex]

Explanation:

According to the definition of refractive index, the refractive index of the material is defined as the ratio of speed of light in vacuum to the speed of light in medium.

(a) refractive index, n = 1.52

[tex]n=\frac {c}{v}\\\\1.52 = \frac{3\times 10^8}{v}\\\\v = 1.97\times 10^8 m/s[/tex]

(b) refractive index, n = 1.51

[tex]n=\frac {c}{v}\\\\1.51 = \frac{3\times 10^8}{v}\\\\v = 1.99\times 10^8 m/s[/tex]

(c) refractive index, n = 1.36

[tex]n=\frac {c}{v}\\\\1.36 = \frac{3\times 10^8}{v}\\\\v = 2.21\times 10^8 m/s[/tex]

Answer:

True

Explanation:

Minerals can be defined as any form of naturally occurring, inorganic solid substance characterized by a crystal structure. Also, minerals are homogeneous in nature with a defined chemical composition and characterized by a crystal structure comprising of ions, atoms, or molecules in an orderly arrangement.

Generally, molecules attach on the inside of a mineral to give it shape. Therefore, the molecule of a mineral is a crystal three-dimensional regular structure (arrangement) of chemical particles that are bonded together and determines its shape.

Furthermore, the chemical composition (property) of a mineral reflect the presence and arrangement of atoms in each.

Due to the fact that these molecules are structurally arranged (ordered) and are repeated by different symmetrical and translational operations, they determine the shape of minerals. Some examples of minerals are iron, copper, aluminum, tin, coal, quartz, feldspar, mica, etc.

Additionally, inorganic-crystalline solid substances which are found naturally within earth are referred to as minerals.

In conclusion, a mineral in the earth's crust exists naturally in form of solid elements or compounds.

Answer: D

Explanation:

Answer:

Part A

The cart with low fan mass has an average velocity of approximately 63.29 cm/s

Part B

The cart with medium fan mass has an average velocity of approximately 45.[tex]\overline{045}[/tex] cm/s

Part C

The cart with high fan mass has an average velocity of approximately 36.496 cm/s

Explanation:

Part A

The average velocity is given as follows;

[tex]Average \ velocity, v_{average} = \dfrac{Total \ distance}{Elapsed \time \ to \ finish \ line} = \dfrac{\Delta x}{\Delta t}[/tex]

The average velocity for the 2 kg fan mass, which is the cart with low fan mass, is [tex]v_{average}[/tex] = 500 cm/7.9 s ≈ 63.29 cm/s

The cart with low fan mass has an average velocity [tex]v_{average}[/tex] ≈ 63.29 cm/s

Part B

The average velocity of the cart with medium fan mass, 4 kg, is [tex]v_{average}[/tex] = 500 cm/11.1 s = 45.[tex]\overline{045}[/tex] cm/s

The cart with medium fan mass has an average velocity [tex]v_{average}[/tex] ≈ 45.[tex]\overline{045}[/tex] cm/s

Part C

The average velocity of the cart with high fan mass, 6 kg, is [tex]v_{average}[/tex] = 500 cm/13.7 s = 36.496 cm/s

The cart with high fan mass has an average velocity [tex]v_{average}[/tex] ≈ 36.496 cm/s.

Answer:

its

67.6

78.1

89.3

Explanation:

i just took the assignment,  2021.

Answer:

All options presented were applied to the answer.

Explanation:

The sample response presented in the question above, refers to a closed system where two molecules after colliding satisfy the conservation of momentum law, which can also be called the conservation law of linear momentum. This law states that in a closed system the initial state of the components must be maintained and remain the same until the final state, that is, the two molecules maintain their ideal momentum before and after the collision. This means that if they had 1.5 kg • m/s before the collision, this value must be maintained after the collision. All these concepts are presented in the sample response.

Answer:

What did you include in your response? Check all that apply. The law of conservation of momentum is satisfied. The momentum before the collision is 1.5 kg • m/s. The momentum after the collision is 1.5 kg • m/s. The momentum before and after the collision is the same.

Explanation:

The sample response presented in the question above, refers to a closed system where two molecules after colliding satisfy the conservation of momentum law, which can also be called the conservation law of linear momentum. This law states that in a closed system the initial state of the components must be maintained and remain the same until the final state, that is, the two molecules maintain their ideal momentum before and after the collision. This means that if they had 1.5 kg • m/s before the collision, this value must be maintained after the collision. All these concepts are presented in the sample response.

Answer:

4.186 m/s^2

Explanation:

First, convert km/hr to m/s:

(75 km/hr)(1000m/1km)(1hr/60min)(1min/60s) = 20.83 m/s

Then, divide 20.93 m/s by 5.0s

(20.93 m/s) / (5.0s) = 4.186 m/s^2

Answer:

Primera Ley de Newton, también llamado Ley de la Inercia de Newton.

Explanation:

Este concepto es la Primera Ley de Newton o Ley de la Inercia de Newton, la cual dice textualmente que todo cuerpo al cual no se aplica ninguna fuerza externa neta no nula sobre sí se encuentra en reposo o desplazándose a velocidad constante.

Entiéndase a la inercia como la tendencia de un cuerpo a oponerse al cambio en su estado de movimiento.

[tex]speed = \frac{distance}{time} \\ = 100 \div 5 \\ = 20m \: per \: second[/tex]

#CarryOnLearning

Answer:

Before the collision:

m v1 = .5 kg * 15 m/s = 7.5 kg-m/s

Incidentally, after the collision

(M + m) v2 = 7.5

v2 = 7.5 / (1 + .5) = 5 m/s