A bullet was fired from a gun. The bullet had a mass of 50g and the kinetic energy of the bullet was 25 kJ. How fast did it go?

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Answer:

Explanation:

KE = 1/2mv^2

KE = 1/2(2.1)(10)^2

KE=105N

Answer:

154 N horizontal (to the right) 15.9 N vertical (up)

Explanation:

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Answer:they answer is false

Answer:

6.T

7.T

8.F

9.F

10.T

Explanation:

Answer:

your answer is 21 n

Explanation:

Answer:

B)20%

Explanation:

only the 2j of energy is getting used out of 10j.all other 8j are wasted as heat.

therefore the efficiency=2/10*100=20

Answer:

1) Image

2) virtual

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Explanation:

Answer:

Blood group

Explanation:

Answer:

A. Blood group.

Explanation:

They could purely random genetic changes.

Answer:

That is because light travels much faster than sound waves. … It takes approximately 5 seconds for the sound to travel 1 mile.

Explanation:

If the thunder follows the lightning almost instantly, you know the lightning is too close for comfort.

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The halogen elements are the six elements in Group 17 of the periodic table. Group 17 is the second column from the right in the periodic table and contains six elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (As), and tennessine (Ts).

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Answer:r other boundary that does not absorb the energy of the radiation and bounces the waves away from the surface. The simplest example of visible light reflection is the surface of a smooth pool of water, where incident light is reflected in an orderly manner to produce a clear image of the scenery surrounding the pool. Throw a rock into the pool (see Figure 1), and the water is perturbed to form waves, which disrupt the reflection by

Explanation:

Activity: Is it the same?!

Reflection of light (and other forms of electromagnetic radiation) occurs when the waves encounter a surface or other boundary that does not absorb the energy of the radiation and bounces the waves away from the surface. The simplest example of visible light reflection is the surface of a smooth pool of water, where incident light is reflected in an orderly manner to produce a clear image of the scenery surrounding the pool. Throw a rock into the pool (see Figure 1), and the water is perturbed to form waves, which disrupt the reflection by scattering the reflected light rays in all directions.

Some of the earliest accounts of light reflection originate from the ancient Greek mathematician Euclid, who conducted a series of experiments around 300 BC, and appears to have had a good understanding of how light is reflected. However, it wasn't until a millennium and a half later that the Arab scientist Alhazen proposed a law describing exactly what happens to a light ray when it strikes a smooth surface and then bounces off into space.

In this activity you will be working as an engineer that is working to modify different kinds of digital cameras and to study the effect of changing incident angle on the reflected angle.

Method

Explain the steps of your experiment and identify the scientific variables:

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

• Independent Variable

----------------------------------------------------------------------------------------------------------------

• Dependent Variable

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Answer:

friction from the ground rubs on the tire which gives it more force to move forward,

Explanation: without friction the bike wont be able to use the motion to move forward. but the tires start to wear out easily.

Answer:

217 N

Explanation:

Answer:217N

Explanation:

Answer:

Element #1

protons = 1

neutrons = 0

electrons = 1

atomic number = 1

atomic mass = 1

Element #2

protons = 2

neutrons = 2

electrons = 2

atomic number = 2

atomic mass = 4

Element #3

protons = 3

neutrons = 3

electrons = 3

atomic number = 3

atomic mass = 6

Explanation:

Atomic mass = proton = electrons at neutral state

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Answer:

The height of the apple from the ground is at 49552.61071 m or is approximately at 5.0 × 10 m

Explanation:

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Answer:

The material is called a Lubricant.

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Answer:

Option (c) Acceleration is 1/2x the original acceleration

Explanation:

To know the the correct answer to the question, we shall determine the acceleration of the box in each case.

Case 1:

Mass (m) = m

Force (F) = 20 N

Acceleration 1 (a₁) =?

F = ma₁

20 = m × a₁

Divide both side by m

a₁ = 20 / m

Case 2:

Mass (m) = 2m

Force (F) = 20 N

Acceleration 2 (a₂) =?

F = ma₂

20 = 2m × a₂

Divide both side by 2m

a₂ = 20 / 2m

a₂ = 10 / m

Finally, we shall determine the acceleration of the box after the mass was doubled. This can be obtained as illustrated below:

Acceleration 1 (a₁) = 20 / m

Acceleration 2 (a₂) = 10 / m

a₂ : a₁ = 10 / m : 20 / m

a₂ / a₁ = 10 / m ÷ 20 / m

a₂ / a₁ = (10 / m) × (m / 20)

a₂ / a₁ = ½

Cross multiply

a₂ = ½a₁

Thus, the acceleration of the box after the mass was doubled is ½ times the original acceleration.

Answer:

It would produce fat..........

Answer:

5 m/s

Explanation:

The formula of speed is : distance/time taken.

The skateboarder covered a distance of 20 meters in 4 seconds. So,

Distance = 20 meters

Time Taken = 4 seconds

Speed = 20/4 = 5 m/s

Answer:

The energy that it starts with at the top of the inclinede Plane

Explanation:

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Answer:

Two orbitals for their electrons and six in the 2p subshell

Explanation:

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Answer:

about 30.714degC

Explanation:

Assuming

specific heat of water at  4200 J/kg * K

specific heat of aluminum 900 J/kg * K

(actual values to higher precision differ, and also change slightly with temperature).

To raise the aluminum's temp by 1K we need 900J * (210g / 1kg) = 189J

189J given by the water decreases its temp by 1K * (189J / 4200J) * (1kg / 550g) = 0.0(81)K.

So every K the temp of aluminum rises, 0.0(81)K falls the temp of the water.

At a difference of (32degC - 15degC) = 17K, we infer the temp will balance out after 17K / (1K + 0.0(81)K) "steps", so about 15.714.

The final temperature will be around 30.714degC

The final temperature of the water-aluminum mixture is 30.7 ⁰C.

The given parameters;

The final temperature of the mixture is determined by applying the principle of conservation of energy;

Heat lost by the water = Heat gained by the aluminum

[tex]mc_w \Delta t = mc_{AL} \Delta t\\\\550 \times 4.184 \times (32 - t) = 210\times 0.9 \times (t - 15)\\\\73638.4 - 2301.2t = 189t - 2835\\\\76473.4 = 2490.2t\\\\t =\frac{76473.4}{2490.2} \\\\t = 30.7 \ ^0C[/tex]

Thus, the final temperature of the water-aluminum mixture is 30.7 ⁰C.

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Answer:

Final temperature, T2 = 131895°C

Explanation:

Given the following data;

Mass = 50g

Initial temperature = 20°C

Quantity of heat = 5275J

Specific heat capacity = 0.50 J/g°C

To find the final temperature;

Heat capacity is given by the formula;

[tex] Q = mcdt[/tex]

Where;

Q represents the heat capacity or quantity of heat.

m represents the mass of an object.

c represents the specific heat capacity of water.

dt represents the change in temperature.

Making dt the subject of formula, we have;

[tex] dt = \frac {Q}{mc} [/tex]

Substituting into the equation, we have;

[tex] dt = \frac {5275}{50*0.50} [/tex]

[tex] dt = \frac {5275}{25} [/tex]

dt = 131875°C

Now, the final temperature T2 is;

But, dt = T2 - T1

T2 = dt + T1

T2 = 131875 + 20

T2 = 131895°C

The final temperature when a glass piece absorbs heat  5275 joules  will be  T2= 231 C

The heat capacity is defined as the amount of heat any material can absorb when the temperature is changed to unit quantity.

Given the following data;

Mass = 50g

Initial temperature = 20°C

Quantity of heat = 5275J

Specific heat capacity = 0.50 J/g°C

To find the final temperature;

Heat capacity is given by the formula;

[tex]Q= mc(T_2-T_1)[/tex]

Where;

Q = represents the heat capacity or quantity of heat.

M= represents the mass of an object.

C= represents the specific heat capacity  

T1= initial temperature

T2 = Final temperature

Substituting into the equation, we have;

[tex]Q=mc(T_2-T_1)[/tex]

[tex](T_2-T_1)=\dfrac{Q}{mc}[/tex]

[tex](T_2-T_1)=\dfrac{5275}{50\times 0.50}[/tex]

[tex]T_2=211+T_1[/tex]

[tex]T_2=211+20=231 ^oc[/tex]

Thus the final temperature when a glass piece absorbs heat  5275 joules  will be  T2= 231 C

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Answer:

Car A traveled with the greatest speed.

Explanation:

We know that the steepness of the slope of the line on the distance-time graph represents speed.

Important Tip:

For example, at t = 5 seconds, the A car has covered more than 80 meters while all the other cars have covered less than 80 meters during the same period.

IIn fact, during the entire journey, it is clear that from the graph that the slope of the line of A car is more vertical — steep — than the slopes of cars B, C, and D.

Therefore, car A traveled with the greatest speed.

Answer:

answer is b. any movement that uses your muscles and requires energy

Explanation:

Answer:

your answer is 11

Explanation:

We have that for the Question "Describe what a high and low frequency electromagnetic wave look like:" it can be said that

From the question we are told

Describe what a high and low frequency electromagnetic wave look like:

Generally the equation for the frequency  is mathematically given as

[tex]f=\frac{1}{t}\\\\and\\\\f=\frac{v}{\lambda}\\\\[/tex]

Therefore

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The statement that accurately describes viscosity is option D: Attractive forces between molecules at the surface cause a liquid to resist spreading out. Option D

Viscosity is a measure of a fluid's resistance to flow. It quantifies how easily a fluid can be deformed or how readily it flows. In liquids, viscosity arises from the cohesive forces between molecules.

When molecules in a liquid are attracted to each other, they tend to stick together and resist movement. At the surface of the liquid, there is a greater degree of attractive forces between the molecules since they have fewer neighboring molecules to interact with.

This surface tension creates a resistance to the spreading out of the liquid and causes it to exhibit a more rounded or droplet-like shape.

The attractive forces between molecules at the surface of a liquid contribute to the cohesive forces within the liquid as a whole, resulting in a higher viscosity.

The stronger the attractive forces between the molecules, the higher the viscosity of the liquid. For example, honey has a higher viscosity compared to water because the molecules in honey have stronger attractive forces, making it flow more slowly.

Option A is not an accurate description of viscosity. Viscosity is not solely determined by the size of the molecules in a liquid but rather by the strength of the attractive forces between the molecules.

Option B describes electrical conductivity, not viscosity. It refers to a material's ability to slow down or impede the flow of electrons.

Option C describes the property of malleability, not viscosity. It refers to a material's ability to be shaped into a thin sheet without breaking.

Therefore, option D accurately describes viscosity by highlighting the role of attractive forces between molecules at the surface of a liquid in resisting the spreading out of the liquid

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