A girl coasts down a hill on a sled, reaching a level surface at the bottom with a speed of 7 m/s. The coefficient of kinetic friction between runners and snow is 0.042, and the girl and sled together weigh 764 N. The acceleration of gravity is 9.8 m/s². How far does the sled travel on the level surface before coming to a rest? Answer in units of m.​

Explanation:

It is given that,

Mass of the object, m = 350 g = 0.35 kg

Spring constant of the spring, k = 5.2 N/m

Amplitude of the oscillation, A = 10 cm = 0.1 m

Frequency of a spring mass system is given by :

\(f=\dfrac{1}{2\pi}\sqrt{\dfrac{k}{m}} \\\\f=\dfrac{1}{2\pi}\sqrt{\dfrac{5.2}{0.35}} \\\\f=0.613\ Hz\)

Time period:

\(T=\dfrac{1}{f}\\\\T=\dfrac{1}{0.613}\\\\T=1.63\ s\)

Maximum velocity in the spring is given by :

\(v=A\omega\)

\(v=A\sqrt{\dfrac{k}{m}} \\\\v=0.1\times \sqrt{\dfrac{5.2}{0.35}} \\\\v=0.38\ m/s\)

The maximum force acting in the spring is :

\(F=-kx\\\\F=kA\\\\F=5.2\times 0.1\\\\F=0.52\ N\)

Hence, this is the required solution.

Answer:

D

Explanation:

It is not FDA approved, so doctors will probably not recommend it and the product might not work as advertised. The product might not make you sick.

The FDA has not approved it, so it doesn't have any evidence it works.

Answer:  scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of a phenomenon is called a scientific theory

hope this helps

plz mark brainleist

\(\\ \sf\longmapsto Pressure=\dfrac{Force}{Area}\)

\(\\ \sf\longmapsto Force=Pressure(Area)\)

\(\\ \sf\longmapsto Force=200(0.2)\)

\(\\ \sf\longmapsto Force=40N\)

5.1 m

Explanation:

Let's set the ground as our reference point. Let's also call the dropped ball to be ball #1 and its height above the ground at any time t is given by

\(y_1 = 10 - \frac{1}{2}gt^2\) (1)

where 10 represents its initial height or displacement of 10 m above the ground. At the same time, the displacement of the second ball with respect to the ground \(y_2,\) is given by

\(y_2 = v_0t - \frac{1}{2}gt^2\) (2)

At the instant the two balls collide, they will have the same displacement, therefore

\(y_1 = y_2 \Rightarrow 10 - \frac{1}{2}gt^2 = v_0t - \frac{1}{2}gt^2\)

or

\(v_0t = 10\:\text{m}\)

Solving for t, we get

\(t = \dfrac{10\:\text{m}}{v_0} = \dfrac{10\:\text{m}}{10\:\text{m/s}} = 1\:\text{s}\)

We can use either Eqn(1) or Eqn(2) to hind the height where they collide. Let's use Eqn(1):

\(y_1 = 10\:\text{m} - \frac{1}{2}(9.8\:\text{m/s}^2)(1\:\text{s})^2\)

\(\:\:\:\:\:\:\:= 5.1\:\text{m}\)

Answer:a vertical expanse of water stretching between the surface and the floor of a body of water

Explanation:

Answer:

The equation of momentum for a linear system is simply P = mv where P = momentum (kg·m/sec or lb·ft/sec); m = mass (kg or lb); and v = velocity (m/s or ft/sec). ... By reducing her inertia (I = mr2 where r has been decreased) her angular velocity, ω, must increase in order for the angular momentum to remain constant.

https://www.gstatic.com/education/formulas2/355397047/en/moment_of_inertia.svg

hope this helps?

Explanation:

Answer: 520 nm; 5.77 × 1014 Hz; 3.82 × 10−19 J

(a) The average force experienced by the person for 0.85 cm compression is 3,722,425.8 N.

(b) The average force experienced by the person for 13 cm compression is 243,389.4 N.

The kinetic energy of the person is calculated as follows;

K.E = ¹/₂mv²

K.E = ¹/₂ x 62.5 x 22.5²

K.E = 15,820.31 J

E = ¹/₂Fx

2E = Fx

F = (2E)/x

F = (2 x 15,820.31)/(0.0085)

F = 3,722,425.8 N

F = (2 x 15,820.31)/(0.13)

F = 243,389.4 N

Learn more about average force here: https://brainly.com/question/16200276

#SPJ1

Answer:

=55.21 is the answer.........

Answer:

Explanation:

The voltage across the inductor VL = IXL

I is the total current flowing in the circuit and XL is the inductive reactance.

First we need to get the current flowing in the circuit.

From the expression above;

I = VL/XL

Since XL = 2πfL

I = VL/ 2πfL

Given VL = 2.8V, frequancy f = 100Hz and inductance L = 0.049-H

I = 2.8/2π*100*0.049

I = 2.8/30.79

I = 0.091A

Also;

Vrms = VL + VR

VR is the voltage across the resistor.

VR = Vrms - VL

VR = 7.9 - 2.8

VR = 5.1V

Then we can calculate the resistance of the resistor

According to ohms law VR = IR

Since the inductance and resistance ar connected in series, the same current will flow through them.

R = VR/I

R = 5.1/0.091

R = 56.04 ohms

Hence the resistance of the resistor in this circuit is 56.04 ohms

Answer:25N/

Explanation:

Answer:

The total momentum of the cars before the collision is 61,000 kg.m/s

The total momentum of the cars after the collision is 61,000 kg.m/s

The velocity of the cars after the collision is 27.727 m/s

Explanation:

Given;

mass of the first car, m₁ = 1000 kg

initial velocity of the car, u₁ = 25 m/s

mass of the second car, m₂ = 1200 kg

initial velocity of the second car, u₂ = 30 m/s

The common velocity of the cars after collision = v

The total momentum of the cars before collision is calculated as;

P₁ = m₁u₁  +  m₂u₂

P₁ = (1000 x 25)  +  (1200 x 30)

P₁ = 61,000 kg.m/s

The total momentum of the cars after collision is calculated as;

P₂ = m₁v + m₂v

where;

v    is the common velocities of the cars after collision since they stick together.

P₂ = v(m₁ + m₂)

To determine "v" apply the principle of conservation of linear momentum for inelastic collision.

m₁u₁  +  m₂u₂  = v(m₁  + m₂)

(1000 x 25)  +  (1200 x 30) = v(1000 + 1200)

61,000 = 2,200v

v = 61,000/2,200

v = 27.727 m/s

The total momentum after collsion = v(m₁ + m₂)

                                                         = 27.727(1000 + 1200)

                                                          = 61,000 kg.m/s

Thus, momentum before and after collsion are equal.

The total equivalent resistance of the circuit which consists of 4 resistors ( 1202, 180, 320 and 3802 ) connected in series is 50.1 KΩ

Resistance of resistor,

Total equivalent resistance, R = R1 + R2 + R3 + R4

R = 12000 + 18 + 32 + 38000

R = 50.1 KΩ

Equivalent resistance is a another way of indicating total resistance. The equivalent resistance will be of a single resistor that replaces the total network without altering any effect on the system.

Therefore, the total equivalent resistance of a series circuit consists of 4 resistors connected in series: 1202, 180, 320, and a 3802 is 50.1 KΩ

To know more about total equivalent resistance

https://brainly.com/question/28258048

#SPJ1

Since focal length cannot be negative for a converging lens, we take the positive value: f ≈ 41 cm Option C

To determine the focal length of the lens, we can use the lens formula, which relates the object distance (u), image distance (v), and focal length (f) of a lens. The lens formula is given by:

1/f = 1/v - 1/u

In this case, the object distance (u) is 25 cm and the image distance (v) is 64 cm. We can substitute these values into the lens formula to solve for the focal length:

1/f = 1/v - 1/u

1/f = 1/64 cm - 1/25 cm

To simplify the equation, we can find a common denominator:

1/f = (25 - 64) / (64 * 25)

1/f = -39 / (64 * 25)

Now, we can invert both sides of the equation to solve for the focal length:

f = (64 * 25) / -39

f ≈ -41.03 cm

Since focal length cannot be negative for a converging lens, we take the positive value:

f ≈ 41 cm

Therefore, the correct answer is option C) 41 cm.

It's important to note that in the lens formula, distances are measured with respect to the lens, with positive values indicating distances on the opposite side of the incident light. The negative value obtained for the focal length indicates that the lens is a converging lens, as expected. Option C

For more such questions on focal length visit:

https://brainly.com/question/9615224

#SPJ8

The obvious major issue is that Wind and Solar energies are intermittent. They need to be supplemented with another source.

Batteries are harmful to the environment if installed in large quantities to back up solar and wind power. Right now, we have to. In the United States, we get around this by importing the ingredients used to create batteries. We export pollution so that we can purchase batteries (or the materials to make batteries).

One further subtle issue is that the times they work are strongly connected, at least in many regions. In many places, it is windier throughout the day, therefore we obtain wind power when we don't need it since we also have solar power.

The alternative or solution to wind and solar are to use Hydro Electric and or Nuclear energy sources.

Wind and solar, as carbon-free, renewable energy sources, can help lessen the world's reliance on oil and gas.

These carbon fuels contribute to environmental degradation and climate change by emitting damaging greenhouse gases that degrade air, water, and soil quality.

Learn more about Wind and Solar Energy:
https://brainly.com/question/26289235
#SPJ1

The neutron number of an atom X, which undergoes alpha, and beta decay reduces the neutron number by 6.  

Alpha decay is the nuclear process in which the parent nucleus emits an alpha or helium particle to form a daughter nucleus. When a particle emits an alpha nucleus, the nucleus loses its two protons and two neutrons. Beta decay is the nuclear process in which the parent nucleus undergoes the emission of electrons to produce a daughter nucleus.

Alpha decay decreases the atomic mass number decreases by 4 and the atomic number decreases by 2. In beta decay, the neutron is converted into a proton and the atomic number decreases by one. The neutron number is affected by alpha decay.

From the given,

X atom undergoes alpha decay. X -----> ₐ₋₂Xᵇ⁻⁴ + He₂⁴. The neutron number decreases by two.  ₐ₋₂Xᵇ⁻⁴ ----->    ₐ₋₂₋₂Xᵇ⁻⁴⁻⁴ + He₂⁴. The neutron number decreases by two.

When the X atom undergoes beta decay, ₐ₋₄Xᵇ⁻⁸---> ₐ₋₅Xᵇ⁻⁸ + ₋₁e⁰. The neutron number does not get affected. When the atom again undergoes alpha decay,  ₐ₋₅Xᵇ⁻⁸ ----->  ₐ₋₇Xᵇ⁻¹². Thus, the neutron number decreases by 6 when the atom undergoes three alpha decay.

To learn more about nuclear decay:

https://brainly.com/question/21114779

#SPJ1

I think no a will be the answer

Stochastic impacts of radiation allude to those that happen arbitrarily and are not reliant upon the portion got. These impacts are related to the likelihood of events and incorporate disease and hereditary changes. Non-stochastic impacts, then again, have a limit, and their seriousness increments with expanding portions.

Models incorporate radiation consumption and intense radiation conditions. Understanding the qualification among stochastic and non-stochastic impacts of radiation is significant in fields like radiation security, atomic medication, and radiobiology.

It assists in setting radiation with dosing limits, creating well-being rules, and carrying out suitable radiation safeguarding measures. By separating these impacts, experts can evaluate and deal with the dangers related to openness to ionizing radiation all the more successfully.

This information guides choices in regard to radiation wellbeing conventions, word-related openness limits, and the improvement of radiation therapy systems in medication.

Learn more about the stochastic and non-stochastic effects of radiation at:

https://brainly.com/question/31840417

Answer:

C

Explanation:

The men bow to the women and the women curtsy to the men.

(took on test and got it right)

Given,

The initial velocity of the plane, u=175 m/s

The angle of projection of the plane, θ=35.5°

The time interval, t=48.0 s

The x-component of the initial velocity is,

On substituting the known values,

The y-component of the initial velocity is

On substituting the known values,

The x-component of the final velocity will remain the same as there is no acceleration on the plane in the x-direction.

The y-component of the final velocity can be calculated as,

Here, the acceleration due to gravity will be a negative value, as the gravity will be acting downwards. On substituting the known values,

Therefore the magnitude of the final velocity is given by,

On substituting the known values,

Therefore the final velocity of the plane will be 395 m/s

As the sun is directly above the plane, the distance traveled by the shadow of the plane will be equal to the range of the projectile motion of the plane.

The range is given by,

On substituting the known values,

Therefore the total distance traveled by the shadow is 2954.75 m

The elongation of the rod beyond its original length would be 2.5 mm.

To elongation of the rod can be deduced using the formula:

ΔL = FL / AE

where:

The cross-sectional area of the steel rod is given by:

The force applied to the rod:

Thus:

ΔL = (98.1 x 2) / ((7.85 x \(10^{-7\)) x (200 x \(10^9\) ))

ΔL = 0.0025 m = 2.5 mm

In other words, the elongation of the steel rod beyond its original length is 2.5 mm.

More on Young modulus can be found here: https://brainly.com/question/14070556

#SPJ1

Answer:

θ = 22.2

Explanation:

This is a diffraction exercise

        a sin θ = m λ

The extension of the third zero is requested (m = 3)

They indicate the wavelength  λ = 630 nm = 630 10⁻⁹ m and the width of the slit  a = 5 10⁻⁶ m

         sin  θ = m λ / a

         sin  θ = 3 630 10⁻⁹ / 5 10⁻⁶

         sin  θ = 3.78 10⁻¹ = 0.378

          θ = sin⁻¹  0.378

to better see the result let's find the angle in radians

          θ = 0.3876 rad

let's reduce to degrees

         θ = 0.3876 rad (180º /π rad)

         θ = 22.2º

Answer:

press add answer and it will let you answer the question

Explanation:

Answer:

you click on the question, then you click answer, then type what you want, and click the green button on the top right saying dd your answer

Explanation:

The average angular speed in each direction of the rotating head is 9.42 rad/s.

The average linear speed in each direction of the bristles against the teeth is 5.09 cm/s.

The approximate speed of the bristles against the teeth when brushing by hand with an ordinary toothbrush is 1.26 cm/s.

Part A: The formula ω = Δθ/Δt can be used to determine the rotating head's average angular speed in each direction.

Where Δθ denotes the angular displacement, Δt denotes the rotational time, and ω denotes the angular speed.

In this instance,

Δt = 1/(7600/2) s/rotation, and Δθ= 70.0 degrees = 70.0 x (π/180) radians.

Thus, ω = (70.0 x (π/180)) / (1/(7600/2)) = 9.42 rad/s is the average angular speed in each direction.

Part B: The following equation can be used to determine the average linear speed of the bristles against the teeth:

v = rω

where r is the head's radius (0.55 cm), v is the linear speed, and ω is the angular speed.

The average linear speed is therefore v = 0.55 x 9.42 = 5.09 cm/s in each direction (rounded to two significant figures)

Part C: Although it is challenging to measure precisely, it is possible to estimate the speed of the bristles against the teeth when brushing by hand with a regular toothbrush. The average linear speed can be estimated using the formula v = rΔθ/Δt if we suppose that the bristles rotate through an average displacement of 45 degrees five times each second.

Where Δθ = 45 degrees, Δt = 1/5 s, and r = the radius of the bristles (estimated as 0.2 cm).

So, the average linear speed is approximately:

v = 0.2 x (45 x (π/180)) / (1/5) = 1.26 cm/s (rounded to two significant figures).

Read more about Angular Speed:

https://brainly.com/question/6860269

#SPJ4

The 10/90 principle can be a powerful tool for taking control of your situation and improving your life. By taking responsibility for what you can change and focusing on your reaction to the situation, you can make positive changes in your life and become the master of your own destiny.

The 10/90 principle refers to the idea that life is made up of 10% of what happens to you and 90% of how you respond to it. In other words, you may not be able to control what happens to you, but you can control your reaction to it. By taking responsibility for what you can change rather than being a victim of what you cannot change, you can take control of your situation and improve your life.One example of a situation where the 10/90 principle could be applied is losing a job. Losing a job can be a devastating experience, and it can be easy to feel like a victim in this situation. However, by applying the 10/90 principle, you can take control of your situation and make positive changes in your life.The first step in applying the 10/90 principle in this situation would be to take responsibility for what you can change. This could mean updating your resume, networking with others in your field, and applying for new jobs. By taking action and doing what you can to find a new job, you are taking control of your situation and improving your chances of finding a new job.
The second step would be to focus on your reaction to the situation. Instead of dwelling on the negative aspects of losing your job, try to focus on the positive aspects. This could mean using the extra time to pursue a new hobby or spend more time with family and friends. By focusing on the positive aspects of the situation, you are taking control of your reaction and improving your overall well-being.
for such more questions on  principle

https://brainly.com/question/26117248

#SPJ8

Answer:

-12.1

Explanation:

i’m almost sure this is it, i’m checking my old answers

if not let me know and i’ll give you some more answers

Answer:

1. frequency (f) = 4.194 × 10^14Hz

2. Energy of photon (E) = 2.779 × 10^-19 J

3. Color is RED

Explanation:

1. Based on the information in this question, a visible light has a wavelength of 715.3 nm.

λ = v/f

Where; λ = wavelength (nm)

v = speed of light (3 × 10^8m/s)

f = frequency (Hz)

f = v/λ

f = 3 × 10^8/715.3 × 10^-9

f = 0.004194 × 10^(8+9)

f = 0.004194 × 10^17

f = 4.194 × 10^14Hz

2. Energy per photon is calculated thus;

E = hf

Where; E = energy of photon (J)

h = Planck's constant (6.626 × 10^-34 J/s)

f = frequency (Hz)

E = 6.626 × 10^-34 × 4.194 × 10^14

E = 27.789 × 10^(-34+14)

E = 27.789 × 10^-20

E = 2.779 × 10^-19 J

3. Based on the wavelength range of the visible spectrum, wavelength of 715.3nm falls between 625-740nm, which is RED color of light. Hence, the color of the visible light is RED.

The frequency is "\(419.5\times 10^{12} \ s^{-1}\)", energy per photon is "\(2.780\times 10^{-19} \ J\)" and the color is "red".

Given:

Wavelength,

or,

           \(= 715.1 \ nm\times (10^-9 \ m/nm)\)

As we know the formula,

→ \(Frequency = \frac{Speed \ of \ light}{wavelength}\)

By substituting the values, we get

                    \(= \frac{(3\times 10^8) }{715.1\times 10^{-9} }\)

                    \(= 419.5\times 10^{12} \ s^{-1}\)  

Now,

The energy per photon will be:

→ \(E = Planck's \ constant\times Frequency\)

      \(= 6.626\times 10^{-34}\times 419.5\times 10^{12}\)

      \(= 2.780\times 10^{-19} \ J\)

Thus the above answer is correct.

Learn more:

https://brainly.com/question/18955849

I believe that Gigafood is the future of food. It is a healthy, convenient, and sustainable way to get all the nutrients our bodies need. I am excited to see how Gigafood can change the way people eat.

Name: Gigafood

Company: Gigafood, Inc.

Components:

Gigafood is a complete and balanced meal that provides all the essential nutrients the body needs.

Macronutrients: Carbohydrates are the body's main source of energy. Fats provide essential fatty acids and help the body absorb vitamins. Protein is necessary for building and repairing tissues.

Micronutrients: Vitamins and minerals are essential for many bodily functions, including growth, development, and immunity.

Antioxidants: Berries and nuts are rich in antioxidants, which help protect the body against damage from free radicals.

Slogan: Gigafood: The only food you'll ever need.

Disclaimer: Gigafood is a healthy and nutritious food, but it is not a cure for any disease. It is important to eat a balanced diet and get regular exercise.

Health benefits:

Diseases or conditions that Gigafood can help with:

Gigafood is a convenient and delicious way to get all the nutrients your body needs.

Gigafood is a healthy and sustainable choice for the environment.

Gigafood is a great way to save time and money on food.

The advertisement should be visually appealing and easily noticeable. It should use bright colors and simple graphics to capture attention. The advertisement should also include the Gigafood logo and slogan.

I believe that Gigafood is the future of food. It is a healthy, convenient, and sustainable way to get all the nutrients our bodies need. I am excited to see how Gigafood can change the way people eat.

Learn more about food on

https://brainly.com/question/25884013

#SPJ1

Answer:

T = 99.51 hour

Explanation:

Mass of Uranus, \(M=8.68\times 10^{25}\ kg\)

The moon Umbriel orbits Uranus at a distance of \(2.66\times 10^8\ m\)

We need to find Umbriel's orbital period. Let it is T. Using Kepler's third law of motion to find it.

\(T^2\propto r^3\\\\T^2=\dfrac{4\pi^2r^3}{GM}\\\\T^2=\dfrac{4\pi^2\times (2.66\times 10^8)^3}{6.67\times 10^{-11}\times 8.68\times 10^{25}}\\\\T=358244.51\ s\)

As 1 hour = 3600 s

358244.51 s = 99.51 hour

Hence, Umbriel's orbital period is 99.51 hour.

Answer:

Explanation:

its 99.51 im not just saying that because of the person on top of me but i have all my notes from physics and from chemistry and from biology from when i was on acellus! but the top of me is right :)