If a 70-kg swimmer pushes off a pool wall with a force of 250 N, what is her acceleration?

Kepler's second law of planetary motion states that the imaginary line connecting the sun to a planet sweeps out equal areas in equal times.

Kepler's second law of planetary motion states that the imaginary line connecting the sun to a planet sweeps out equal areas in equal times. This means that as a planet moves around the sun, it will cover equal areas in equal amounts of time. This law helps explain how planets move in their orbits and provides insight into the dynamics of the solar system.

For example, consider two points in a planet's orbit, point A when it is close to the sun, and point B when it is farther away. The imaginary line drawn from the sun to the planet at point A will sweep out a large arc due to the increased speed, corresponding to a large area. At point B, where the planet is moving slower, the arc and hence the area swept out will be smaller. According to Kepler's Second Law, these two areas will be equal if the time periods considered are equal.

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E =  h c / ʎ

where,

h is the Planck’s constant = 6.626 x 10⁻³⁴ m² kg / s

c is the speed of light = 3 x 10₈ m/s

ʎ is the wavelength of light = 150 nm = 150 x 10⁻⁹ m

Now pot the values in equation;

E = (6.626 x10⁻³⁴ m² kg / s) x (3 x 10⁸ m/s) / (150 x 10⁻⁹ m)

E = 1.325 x 10⁻¹⁸ J

Now by using the following equation we can calculate the frequency;

E = hf

f = E/h

f = 1.325 x 10⁻¹⁸ / 6.626 x 10⁻³⁴ 

f = 1.9997 x 10¹⁵ Hz

The energy of an ultraviolet photon with a wavelength of 150 nm is 1.33 × 10⁻¹⁸ J, and its frequency is 2 × 10¹⁵ Hz.

To determine the energy of an ultraviolet photon with a wavelength of 150 nm, we need to first find the photon’s frequency using the light equation:

c = λ × ν

Rearranging the equation to solve for frequency:

ν = c / λ

Substituting the values:

ν = (3.00 × 10⁸ m/s) / (150 × 10⁻⁹ m) = 2.00 × 10¹⁵ Hz

Next, we use Planck’s equation to find the energy of the photon:

E = h× ν

Substituting the values:

E = (6.626 × 10⁻³⁴ J·s) × (2.00 × 10¹⁵ Hz) = 1.33 × 10⁻¹⁸J

The energy of the ultraviolet photon with a wavelength of 150 nm is 1.33 × 10⁻¹⁸ Joules, and its frequency is 2 × 10¹⁵ Hz.

The wavelength of the light is approximately 633 nanometers (nm).

Wavelength is simply the distance over which the shapes of waves are repeated. It is expressed as:

λ = c ÷ f

Where λ is wavelength, c is speed of light and f is frequency.

Given the parameter:

Frequency f = 4.74 × 10¹⁴ Hz

Speed of light c = 3.00 × 10⁸ m/s

Wavelength λ =?

Plug the values into the above formula and solve for the wavelength λ:

λ = c ÷ f

λ = (3.00 × 10⁸) ÷ (4.74 × 10¹⁴)

λ = 6.33 × 10⁻⁷ meters

λ = 6.33 × 10⁻⁷ meters × 1,000,000,000

λ = 633 nm

Therefore, the wavelength measures 633 nm.

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The driver's acceleration is approximately 0.08 m/s^2.

The driver's initial speed was 80 km/h and he reaches 110 km/h after driving a distance of 500 m. To find the driver's acceleration, we can use the formula:

Acceleration = (Final Speed - Initial Speed) / Time

Since the distance is given, we need to find the time taken.

Using the formula:

Distance = Initial Speed * Time + (1/2) * Acceleration * Time^2

We can substitute the given values (Initial Speed = 80 km/h, Final Speed = 110 km/h, Distance = 500 m) and solve for the time. Once we have the time, we can substitute it back into the first equation to find the acceleration.

After calculating, the driver's acceleration is approximately 0.08 m/s^2.

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Answer: Hello!  

"The force which attracts iron nails towards a magnet" is a magnetic force, where the only thing acting on the iron nails is the magnetic field produced by the magnet.

"The force which attracts a positive charge towards a negative charge" and this is an electric force, where the negative charge creates an electric field, and this electric field acts on the positive charge

Both forces are related because both of them are consequences of the electromagnetic field.

Because the things acting on the objects are fields, both of these forces are non-contact forces.

Answer: Flyash

Explanation:

Flyash is a waste produced after the combustion of the coal in a power plant. The ash is in the form of small dark flakes.

The natural gas is a fuel which is produced by the degradation and decomposition of the organic matter generated from plant and animal matter. The following are the sources of the natural gas: oils, wells, biomass and landfill as they are sources of deposited organic matter. But flyash contains very less organic content.

A motorcycle mainly wastes energy as heat energy and sound energy. In the engine, chemical energy is transformed into mechanical energy. However, the engine is inefficient and much of the chemical energy is lost as heat energy. Also, some of the energy is transformed to sound energy. This explains why the motorcycle is noisy and has an exhaust pipe.

Answer: it's A this will help you

Explanation:

Answer:

Velocity is a speed with a direction vector associated with it speed is just a displacement per unit of time which makes it scalar

Explanation

Answer:

Explanation:

Plastic can be used for various purposes due to the fact that it can be molted into different shapes and sizes. It is a good packaging and transport material. Due to it's sterile nature does not support microbial growth thus used in healthcare items. It is inexpensive and can be affordable by all.

An environmental agent can be a biological, chemical, or physical factor causing harm to health and ecosystems, with examples including heavy metals and pesticides like DDT. These agents can cause immediate to long-term damage and may lead to resistance in the target organism. Bioremediation is a strategy used to combat environmental contamination.

An environmental agent is a biological, chemical, or physical factor that has the potential to cause harm to humans, ecosystems, or both. Chemical agents, such as heavy metals like mercury, lead, and cadmium, pesticides and endocrine disrupters, contribute significantly to environmental damage and can pose serious health risks. These agents are often by-products of industrial activities and can biomagnify in the food chain, leading to toxic levels in organisms at higher trophic levels, such as swordfish, which can then affect humans who consume them.

Environmental contamination can stem from diverse sources, impacting air, water, and soil. Contaminants can lead to acute or chronic health problems, affecting specific organs, cells, or biochemical pathways in the body. The field of environmental toxicology strives to understand and mitigate these effects, knowing that substances such as DDT and other pesticides have both immediate and long-term ecological consequences, while also becoming less effective over time as pests develop resistance.

Examples of Environmental Agents and Their Impact:

It is vital to address these environmental threats by employing strategies such as bioremediation, using plants to clean up soils from toxic metals, for example, to safeguard human health and protect ecosystems.

Answer:

1= Cerebrum.

2=Ventricles  

3.Cerebellum.

4.Brain stem  

5.Spinal cord.

Explanation:

You have to convert it to newtons so:

4,000 N

The mass of the ball is approximately 18.57 grams.

To determine the mass of a ball with a given velocity and wavelength, we can use the de Broglie relation, which states that the wavelength [tex]\( \lambda \)[/tex]of a particle is inversely proportional to its momentum  p . The de Broglie relation is given by:

[tex]\[ \lambda = \frac{h}{p} \][/tex]

where h is Planck's constant[tex]6.626 \times 10^{-34} \)[/tex] Js) and  p  is the momentum of the particle. The momentum can also be expressed as the product of the mass  m of the particle and its velocity  v :

p = mv

Combining these two equations, we get:

[tex]\[ \lambda = \frac{h}{mv} \][/tex]

Rearranging the equation to solve for mass  m , we have:

[tex]\[ m = \frac{h}{\lambda v} \][/tex]

Given:

- Velocity v = 40.0 m/s

- Wavelength[tex]\( \lambda = 8.92 \times 10^{-34} \)[/tex]m

- Planck's constant \[tex]h = 6.626 \times 10^{-34} \)[/tex] Js

Plugging in the values, we get:

[tex]\[ m = \frac{6.626 \times 10^{-34} \text{ Js}}{(8.92 \times 10^{-34} \text{ m})(40.0 \text{ m/s})} \][/tex]

[tex]\[ m = \frac{6.626 \times 10^{-34}}{8.92 \times 10^{-34} \times 40.0} \][/tex]

[tex]\[ m = \frac{6.626}{8.92 \times 40.0} \][/tex]

[tex]\[ m \ =\frac{6.626}{356.8} \][/tex]

[tex]\[ m \ = 0.01857 \text{ kg} \][/tex]

Converting the mass to grams (since 1 kg = 1000 g), we have:

[tex]\[ m \ = 0.01857 \text{ kg} \times 1000 \text{ g/kg} \][/tex]

[tex]\[ m \ =18.57 \text{ g} \][/tex]

I believe this question ask for the energy dissipated by friction.

The overall energy equation for this is:

F = PE – KE

where F is friction loss, PE is potential energy = m g h, KE is kinetic energy = 0.5 m v^2

F = 66 kg * 9.8 m/s^2 * 170 m – 0.5 * 66  kg * (11 m/s)^2

F = 105,963 J  ~  106,000 J 

A total of 1.1 × 10⁵Joules energy was dissipated by friction

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Let's recall Kinetic Energy Formula as follows:

[tex]Ek = \frac{1}{2}mv^2[/tex]

Ek = Kinetic Energy ( Joule )

m = mass of the object ( kg )

v = speed of the object ( m/s )

Let us now tackle the problem !

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Complete Questions:

A 66-kg skier starts from rest at the top of a 1200-m long trail which drops a total of 170 m from top to bottom. at the bottom, the skier is moving 11.0 m/s. How much energy was dissipated by friction?

Given:

mass of skier = m = 66 kg

height of trail = h = 170 m

velocity of skier = v = 11.0 m/s

Asked:

work done by friction = W = ?

Solution:

[tex]W = Ep - Ek[/tex]

[tex]W = mgh - \frac{1}{2}mv^2[/tex]

[tex]W = 66(9.8)(170) - \frac{1}{2}(66)(11.0)^2[/tex]

[tex]W = 109956 - 3993[/tex]

[tex]W = 105963[/tex] [tex]\texttt{ J}[/tex]

[tex]W \approx 1.1 \times 10^5 \texttt{ J}[/tex]

[tex]\texttt{ }[/tex]

A total of 1.1 × 10⁵ Joules energy was dissipated by friction

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Grade: High School

Subject: Physics

Chapter: Dynamics

The momentum of the basketball is three times greater than the momentum of the softball, given that they both have the same velocity.

Momentum is defined as the product of an object's mass and its velocity. If the softball and the basketball are both moving at the same velocity, we can compare their momenta based on their respective masses.

The momentum of an object is given by the equation:

Momentum = mass × velocity

For softball:

Momentum_softball = m_softball × velocity

For the basketball:

Momentum_basketball = m_basketball × velocity

m_basketball = 3 × m_softball

Momentum_basketball = (3 × m_softball) × velocity

Comparing the momenta, The momentum of the basketball is three times greater than the momentum of the softball, given that they both have the same velocity.

To know more about the momentum:

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