A 4 kg object is moving at a speed of 5 m/sec. How much kinetic energy does the object have? A. 10 joules B. 20 joules C. 50 joules D. 100 joules

Answer:

The nucleus is very small compared to the size of the atom.

The radius of the atom is about 100,000 times the radius of the nucleus

If Johnny is driving North at 42 miles per hour and drives west at 37 miles per hour, then the resultant velocity would be 55.9 mph north, therefore the correct answer is option A.

The total displacement covered by any object per unit of time is known as velocity. It depends on the magnitude as well as the direction of the moving object.

As given in the problem Johnny is driving North at 42 mph. Then drives west at 37 mph.

The resultant velocity of the Jhonny = √ ( 42² + 37² )

                                                            = 55.97 miles per hour

Thus, the resultant velocity of Jhonny would be 55.9 mph north, therefore the correct answer is option A.

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Yhe main difference between the two is that digital radio doesn't send complete information all at once

Answer:

Explanation:

in some reactions we see this as a change in the temperature. ... The study of energy changes (particularly heat) in chemical reactions is known as ... When a chemical reaction occurs, bonds in the reactants break, while new bonds form in the product. ... Physical changes can also be classified as exothermic or endothermic.

Answer:

a) F = 353.2 N

b) \(F_{f} = 147.2 N \)

   a = 4.21 m/s²

Explanation:

a) The minimum force necessary to start moving the box s given by:       

\(\Sigma F = 0\)

\( F - \mu_{s}N = 0 \)

\( F = \mu_{s}mg \)

Where:

F: is the force applied to move the box

μs: is the static coefficient of friction = 0.6          

m: is the mass = 60 kg

g: is the gravity = 9.81 m/s²

\( F = 0.6*60 kg*9.81 m/s^{2} = 353.2 N \)

b) The acceleration is:

\( F - F_{f} = ma \)

\( F - \mu_{k}mg = ma \)              

\( a = \frac{F - \mu_{k}mg}{m} = \frac{400 N - 0.25*60 kg*9.81 m/s^{2}}{60 kg} = 4.21 m/s^{2} \)

Now, the friction force is:

\( F_{f} = \mu_{k}mg = 0.25*60 kg*9.81 m/s^{2} = 147.2 N \)

I hope it helps you!    

Answer:

the last answer is correct.

Explanation:

If one team pulls with more force than the middle flag or marker will move

Answer:

B. It's nucleus releases energy

Explanation:

Answer:

diameter = 5.78 cm .

Explanation:

According to Pascal's law, pressure will be equally transferred from smaller to larger cylinder.  

Let the radius of larger cylinder be r cm

cross sectional area = π r²

pressure created on larger cylinder = 1.1 x 10⁴ / π r²

This pressure must be equal to 420 N / cm²

1.1 x 10⁴ / π r² =  420

r² = 8.34

r = 2.89 cm

diameter = 5.78 cm .

The minimum angle is such that the ladder may not slip will be 21.80°.

The ratio of the greatest static friction force (F) between the surfaces in contact before movement begins to the normal (N) force is the coefficient of static friction.

The given data in the problem is;

The coefficient of friction between the ladder,(μ)= 0.40N

The minimum angle is such that the ladder may not slip is, Θ

The frictional force must be smaller than the maximal static friction force to prevent slippage. To denote the ratio of the opposite and adjacent sides of the ramp, we'll use constants like.

The minimum angle such that the ladder may not slip is;

tanΘ=μ

Θ=tan⁻¹(μ)

Θ=tan⁻¹(0.40)

Θ=  21.80°

Hence the minimum angle is such that the ladder may not slip will be 21.80°.

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Answer:

The kinetic energy is 16 joules.                        

Explanation:

Kinetic energy (E) is given by:

\( E = \frac{1}{2}mv^{2} \)

Where:

m: is the mass

v: is the speed

When the kinetic energy is 4 joules, the speed of the object is:

\( v_{1}^{2} = \frac{2E_{1}}{m} = \frac{8}{m} \)                         

Now, if the speed is increased twice then we have:

\( E_{2} = \frac{1}{2}mv_{2}^{2} = \frac{1}{2}m(2v_{1})^{2} = \frac{1}{2}m[4(\frac{8}{m})] = 16 J \)

Therefore, the kinetic energy is 4 times the initial value.  

I hope it helps you!                                

Answer:

Core: the temperature at the very center of the Sun is about 27 million degrees Farenheit (F). The temperature cools down through the radiative and convective layers that make up the Sun's core.

Explanation:

it is about 27 million degrees Fahrenheit

good luck :D

Answer:

However, to mention a few, there are other units of speed such as meters per second, feet per second, light-years per millennium, and knots. Feet per second, but specially meters per second are usually used to measure speed of animals, humans, and free fall objects. Knots is used to measure the speed of ship and/or boats.

Explanation:

we can equate the two quantities of heat to find c: m_water * c_water * ΔT = m_material * c * ΔT, c = (m_water * c_water * ΔT) / (m_material * ΔT)

the above expression yields c = 0.20 kcal/kg * C°.

The formula for calculating the specific heat (c) of a material is:

ΔQ = m * c * ΔT

c = ΔQ / (m * ΔT)

ΔT = 100°C - 40°C = 60°C

m_water = 100 gΔQ = m_water * c_water * ΔT = 100 g * 1.00 kcal/kg * ΔT

m_material = 50 g

ΔT = 40°C - 0°C = 40°C

ΔQ = m_material * c * ΔT

So, we can equate the two quantities of heat to find c:

m_water * c_water * ΔT = m_material * c * ΔT

c = (m_water * c_water * ΔT) / (m_material * ΔT)

the above expression yields  temperature c = 0.20 kcal/kg * C°.

The first container's mass and temperature are multiplied together, and the result is added to the second container's mass and temperature to determine the mixture's water temperature. Finally, divide that outcome by the combined water masses in each container.

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Answer:

The free-body diagram of the cannonball is found in the attachment below

Note The question is incomplete. The complete question is as follows:

A cannonball has just been shot out of a cannon aimed 45∘ above the horizontal rightward direction. Drag forces cannot be neglected.

Draw the free-body diagram of the cannonball.

Explanation:

Free-body diagrams are diagrams used to show the relative magnitude and direction of all forces acting upon an object in a given situation.

In order to construct free-body diagrams, it is important to know the various types of forces acting on the object in that situation. Then, the direction in which each of the forces is acting is determined. Finally the given object is drawn using any given representation, usually a box, and the direction of action of the forces are represented using arrows.

In the given situation of a cannonball which has just been shot out of a cannon aimed 45∘ above the horizontal rightward direction., the forces acting on it are:

F = force exerted by the cannon acting in the direction of angle of projection

Fdrag = drag force. The drag force acts in a direction opposite to the force exerted by the cannon

Fw = weight of the cannonball acting in a downward direction

The free body diagram is as shown in the attachment below.

Question: A ship anchored at sea is rocked by waves that have crests 100 m apart the waves travel at 70m/S, at what frequency do the waves reach the ship?

Answer:

0.7 Hz

Explanation:

Applying,

v = λf............... Equation 1

Where v = velocity of the wave, f = frequency fo the wave, λ = wavelength of the wave

make f the subject of the equation

f = v/λ................. Equation 2

From the question,

Given: v = 70 m/s, λ = 100 m ( distance between successive crest)

Substitute these values into equation 2

f = 70/100

f = 0.7 Hz

Hence the frequency at which the wave reach the ship is 0.7 Hz

Answer:

Answer is given in this paper.

                                               Thank You

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Answer:

1. Static friction = not moving

2.  sliding friction = moving

3. rolling friction = wheels

4. bumpy the surfaces are

5. how heavy the object is

6. it is easier to keep an object moving

7. static friction is GREATER than sliding friction

Explanation:

Simon's idea of placing a diffraction grating at a corner to bend light towards his eyes so that he could see the light coming from around the corner would not work.

The diffraction grating works to split a beam of light into its constituent colors based on the interference patterns created by the multiple slits that the beam passes through.

Therefore, if the diffraction grating was used at a corner, it would split the light into its constituent colors and not bend it towards Simon's eyes. Hence, Simon's idea is impossible.

Diffraction gratings work on a specific range of wavelengths, which means that Simon would not be able to see objects beyond that range. Diffraction gratings require a particular angle of incidence of the light beam.

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When a car's velocity is positive and its acceleration is also positive, the car's overall motion is speeding up in a forward direction.

Velocity is the measure of an object's speed in a specific direction, while acceleration is the measure of how quickly an object's velocity changes over time. So, if both the velocity and acceleration are positive, the car's speed is increasing in the forward direction. This means that the car is moving faster and faster in a forward direction.

Likewise, it can be said that the automobile develops an accelerated movement.

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The given statement " paper prototyping is 1d, you cannot use them to show elevation or shadows" is False as Paper prototyping may initially seem like a one-dimensional representation of a design, but it can be used to show elevation and shadows.  

Designers can use different types of paper, such as tracing paper or vellum, to create multiple layers that can be stacked to simulate depth. They can also use pencils or markers to shade different areas of the prototype, which can help to show how light and shadow would interact with the final design.

Furthermore, paper prototypes can be supplemented with other materials such as foam, cardboard, or plastic to add additional levels of depth and complexity. These materials can be shaped and layered to create a more realistic representation of the final design.

Overall, while paper prototyping may not be as advanced as digital prototyping, it is still a valuable tool for designers. By using shading, layering, and additional materials, designers can create paper prototypes that accurately convey the intended design, including its elevation and shadows.

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Answer:

Initial velocity = 39.2m/s

Maximum height is 78.4m

Explanation:

Given

\(Time, t = 4s\)

Solving (a): Initial Velocity

Using first law of motion:

\(v = u + at\)

Where

\(v = final\ velocity = 0\)

\(u = iniital\ velocity = ??\)

\(a = acceleration = -g\) [g represents acceleration due to gravity]

\(t = 4\)

Substitute these value in the above formula:

\(v = u + at\)

\(0 = u - g * 4\)

\(0 = u - 9.8 * 4\)

Take g as 9.8m/s²

\(0 = u - 39.2\)

\(u = 39.2m/s\\\)

Hence, initial velocity = 39.2m/s

Solving (b): Maximum Height

This will be solved using second equation of motion

\(s = ut + \frac{1}{2}at^2\)

This becomes

\(s = ut - \frac{1}{2}gt^2\)

Substitute values for u, t and g

\(s = 39.2 * 4 - \frac{1}{2} * 9.8 * 4^2\)

\(s = 156.8 - 78.4\)

\(s = 78.4\)

Hence, the maximum height is 78.4m

Answer:

Initial y-component of speed

Vy = 28 * sin 30 = 14 m/sec vertically

1/2 m Vy^2 = 2 m g h    conservation of energy of y-component

h = Vy^2 / (2 * g) = 14^2 / (2 * 9.8) = 10 m

Answer:

Acceleration is the name we give to any process where the velocity changes. Since velocity is a speed and a direction, there are only two ways for you to accelerate: change your speed or change your direction—or change both.

The evolution of energy matrices, the social and environmental consequences of energy sources, and the relationship between energy development and industrial development are critical aspects of understanding the interplay between energy and the modern world. Balancing the need for energy with sustainability and minimizing environmental impacts is a key challenge for societies today.

a) The evolution of the main energy matrices after the industrial revolution:

The industrial revolution marked a significant shift in the sources of energy used to power the growing industries and societies. Prior to the industrial revolution, human and animal labor, along with limited use of water and wind power, were the primary sources of energy. However, with the advent of steam engines and mechanization, there was a need for more abundant and efficient sources of energy.

Coal: Coal became the dominant energy source during the early stages of the industrial revolution. It provided the necessary fuel for steam engines and played a crucial role in powering factories, railways, and steamships.

Oil: The discovery and commercialization of oil in the late 19th century revolutionized the energy landscape. Oil became a major source of energy for transportation, as it fueled the internal combustion engines of automobiles, trucks, and airplanes.

Natural Gas: With the expansion of oil drilling, natural gas also emerged as an important energy source. It is used for heating, electricity generation, and as a feedstock for various industrial processes.

Nuclear Energy: The development of nuclear power in the mid-20th century introduced a new source of energy. Nuclear reactors harness the energy released from nuclear fission reactions to generate electricity.

Renewable Energy: In recent decades, there has been a growing emphasis on renewable energy sources such as solar, wind, hydroelectric, and geothermal power. These sources offer sustainable alternatives to fossil fuels, with lower environmental impact and the potential for long-term energy security.

b) The social and environmental consequences of these energy sources:

Each energy source has its own social and environmental consequences:

Fossil Fuels: The burning of fossil fuels, such as coal, oil, and natural gas, releases greenhouse gases and contributes to climate change. Extraction of fossil fuels can lead to habitat destruction, water pollution, and health hazards for workers and nearby communities.

Nuclear Energy: While nuclear energy does not produce greenhouse gas emissions during operation, it presents risks associated with accidents, radioactive waste disposal, and potential weaponization of nuclear materials. Public safety concerns and environmental risks have led to debates over the use of nuclear power.

Renewable Energy: Renewable energy sources offer benefits in terms of reduced greenhouse gas emissions and environmental sustainability. However, their deployment may require land use changes, and some technologies (e.g., large-scale hydroelectric dams) can cause ecological disruptions and displacement of communities.

c) The relationship between energy development and degree of industrial development:

Energy development and industrial development are closely intertwined. The availability of affordable and reliable energy sources is crucial for driving industrialization and economic growth. Access to abundant energy resources enables countries to power their industries, expand transportation networks, and improve living standards.

Countries that have invested in the development and exploitation of energy sources have typically experienced accelerated industrialization and technological advancement. The ability to secure and utilize energy resources efficiently has been a determining factor in a country's competitiveness and economic prosperity.

Conversely, countries that lack access to energy sources or fail to invest in their energy sectors may face challenges in industrial development. Limited energy availability can constrain production capacities, limit access to modern technologies, and hinder economic progress.

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The top of the ladder is sliding down at a rate of 20/3 ft/sec or approximately 6.67 ft/sec when the bottom is 9 ft from the wall.

To solve this problem, we can use related rates, considering the ladder, the wall, and the distance between them as a right triangle. Let's denote the distance between the bottom of the ladder and the wall as x and the height of the ladder as y. We are given that dy/dt = -4 ft/sec (the rate at which the bottom is pulled horizontally away from the house) and we need to find dx/dt (the rate at which the top of the ladder is sliding down).

Using the Pythagorean theorem, we have x^2 + y^2 = 15^2. Differentiating both sides of the equation with respect to time t, we get 2x(dx/dt) + 2y(dy/dt) = 0. Substituting the given values, we have 2(9)(dx/dt) + 2(15)(-4) = 0.

Simplifying the equation, we have 18(dx/dt) - 120 = 0. Rearranging the terms, we find that dx/dt = 120/18 = 20/3 ft/sec. Therefore, the top of the ladder is sliding down at a rate of 20/3 ft/sec or approximately 6.67 ft/sec when the bottom is 9 ft from the wall.

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The possibility of solar weather affecting terrestrial weather will be the highest on July, 2025.

This is defined as the atmospheric condition of a place and is influenced by various types of factor.

The possibility of solar weather affecting terrestrial weather will be the highest on July, 2025 and there will be a high number of sunspots present.

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Answer: 55.0066 miles per hour

Explanation: i hope this helped, and pls mark me as brainliest

Answer:

About 22 hours in flight time.

Explanation:

It wouldn't give me the walking time.

Hope I helped ya.

< Sarah >

Answer:

Hmm idk u was tryna take the trip or sum

Explanation: