11 A feather of mass 10 g falls from rest from a height of 3 m and takes 2s to hit the ground. Find the air
resistance on the feather.

Answer:

Earthquakes are likely to occur along the San Andreas Fault.

Explanation:

If electrical hand tools are equipped with a three prong power cord with one wire going to ground, then they are designed to ensure safety while using them. The ground wire provides a safe path for any stray electrical currents that may occur during usage.

This can happen due to various reasons such as a short circuit or an equipment malfunction. If such a situation arises, the current will flow through the ground wire and directly into the ground, instead of causing harm to the user. Additionally, the prong power cord ensures that the tool is properly grounded and reduces the risk of electric shock. The three prongs include a hot wire, a neutral wire, and a grounding wire, which together form a complete circuit. The hot wire carries electricity from the source, the neutral wire returns the current to the source, and the grounding wire provides a safe route for any excess current to flow through.

To know more about electrical currents

https://brainly.com/question/1100341

#SPJ11

The reason that you don't observe a Doppler shift when you listen to the car radio when you travel in your car is that the source and observer are moving at the same speed. The answer is a.

When an object emits sound waves, the waves propagate through the medium, such as air, with a certain velocity, which is the speed of sound. The frequency of the sound wave determines its pitch, and the frequency received by an observer is affected by the motion of the source and observer relative to each other. This is known as the Doppler effect.

If the source and observer are moving at the same speed, the frequency of the sound waves received by the observer is not changed, and there is no Doppler shift. In the case of a car radio, the source of the radio waves is the radio station, which is not moving relative to the Earth.

The observer is the person in the car, which is also moving at a constant velocity relative to the Earth. Since the speed of the car is much smaller than the speed of sound, the difference in the speeds of the car and the air inside the car is negligible, and the observer and source are effectively moving at the same speed. Therefore, there is no noticeable Doppler shift.

To know more about doppler shift, refer here:
https://brainly.com/question/15427494#
#SPJ11

Answer:

Explanation:

The gravitational force between two objects can be calculated using the formula:

F = G * (m1 * m2) / r^2

Where F is the gravitational force, G is the gravitational constant (6.67 x 10^-11 Nm^2/kg^2), m1 is the mass of one object (60 kg), m2 is the mass of the other object (5.67 x 10^26 kg), and r is the distance between the two objects (the radius of Saturn, 6.3 x 10^7 m).

F = 6.67 x 10^-11 * (60 * 5.67 x 10^26) / (6.3 x 10^7)^2

F = 6.67 x 10^-11 * 3.402 x 10^33 / 3.969 x 10^14

F = 2.30 x 10^19 N

So the gravitational force on a 60 kg man on Saturn would be approximately 2.30 x 10^19 N.

Answer:

the answer is letter D.

Explanation:

i hope this is help

Answer:

great answer warstep8! add me on disc colludy#8415

Explanation:

Answer:

b. between 2 s and 4 s

Explanation:

2-4 was both 3m/s

The centre of mass of the region is bounded by y=9-x^2 y=5/2x, and the z-axis is (3.5, 33/8). Formulae used to find the centre of mass are as follows:x bar = (1/M)*∫∫∫x*dV, where M is the total mass of the system y bar = (1/M)*∫∫∫y*dVwhere M is the total mass of the system z bar = (1/M)*∫∫∫z*dV, where M is the total mass of the systemThe region bounded by y=9-x^2 and y=5/2x, and the z-axis is shown in the attached figure.

The two curves intersect at (-3, 15/2) and (3, 15/2). Thus, the total mass of the region is given by M = ∫∫ρ*dA, where ρ = density. We can assume ρ = 1 since no density is given.M = ∫[5/2x, 9-x^2]∫[0, x^2+5/2x]dAy bar = (1/M)*∫∫∫y*dVTherefore,y bar = (1/M)*∫[5/2x, 9-x^2]∫[0, x^2+5/2x]y*dA= (1/M)*∫[5/2x, 9-x^2]∫[0, x^2+5/2x]ydA...[1].

The limits of integration in the above equation are from 5/2x to 9-x^2 for x and from 0 to x^2+5/2x for y.To evaluate the above integral, we need to swap the order of integration. Therefore,y bar = (1/M)*∫[0, 3]∫[5/2, (9-y)^0.5]y*dxdy...[2].

The limits of integration in the above equation are from 0 to 3 for y and from 5/2 to (9-y)^0.5 for x.Substituting the values and evaluating the integral, we get y bar = (1/M)*[(9-5/2)^2/2 - (9-(15/2))^2/2]= (1/M)*(25/2)...[3].

Also, the x coordinate of the center of mass is given by,x bar = (1/M)*∫∫∫x*dVTherefore,x bar = (1/M)*∫[5/2x, 9-x^2]∫[0, x^2+5/2x]x*dA= (1/M)*∫[5/2x, 9-x^2]∫[0, x^2+5/2x]xdA...[4].

The limits of integration in the above equation are from 5/2x to 9-x^2 for x and from 0 to x^2+5/2x for y.To evaluate the above integral, we need to swap the order of integration. Therefore, x bar = (1/M)*∫[0, 3]∫[5/2, (9-y)^0.5]xy*dxdy...[5].

The limits of integration in the above equation are from 0 to 3 for y and from 5/2 to (9-y)^0.5 for x.

Substituting the values and evaluating the integral, we get x bar = (1/M)*[63/8]= (1/M)*(63/8)...[6]Thus, the centre of mass of the region is bounded by y=9-x^2 y=5/2x, and the z-axis is (3.5, 33/8).

Learn more about centre of mass here ;

https://brainly.com/question/30389896

#SPJ11

Answer:it's a chemical change.physical changes occur without 2 or more reactants,a reaction,and a product

Explanation:

Since the mass is attached to an ideal spring, the system will undergo simple harmonic motion. The maximum distance the mass will fall is equal to the amplitude of the oscillation.

The period of oscillation can be calculated as:

T = 2π√(m/k)

where m is the mass and k is the spring constant.

Substituting the given values, we get:

T = 2π√(0.7 kg / 86 N/m) ≈ 0.887 s

The maximum distance the mass will fall is equal to half the amplitude of the oscillation, which can be calculated using the equation:

x = A cos(2πt/T)

where x is the displacement of the mass from its equilibrium position at time t, and A is the amplitude of oscillation.

At the maximum displacement, cos(2πt/T) will be equal to -1. Therefore,

A = -x

The velocity of the mass at the maximum displacement will be zero. Therefore, the total energy of the system will be equal to the potential energy at the maximum displacement:

1/2 k A^2 = m g A

where g is the acceleration due to gravity.

Solving for A, we get:

A = (m g / k) = (0.7 kg x 9.81 m/s^2) / 86 N/m ≈ 0.0807 m

Therefore, the maximum distance the mass will fall is approximately 0.0807 m.

Here are the positive instructions corresponding to the given negative instructions:

1. Please refrain from jumping on the sofa.

2. I would like you to walk instead of running now.

3. Could you please pick up your toys?

4. Please avoid pushing him off the slides.

5. Could you go to your room and clean up the mess?

6. Please keep your legs off the table.

7. Let's stop throwing the crayons.

8. I would prefer if you didn't sit near the door.

9. Let's lower our voices and avoid shouting.

10. Please wait for your turn to speak and avoid interrupting me.

The diver under the sea sees the sunset at an angle of 48.24 degrees from the vertical.

To find the angle at which a diver under the water sees the sunset, we need to consider the refraction of light at the water's surface. We can use Snell's Law to determine this angle.

1. Identify the known values:
   The index of refraction of air (n₁) is approximately 1.00
   The index of refraction of water (n₂) is 1.34
   The angle of incidence (θ₁) is 90 degrees, as the light rays from the sunset are coming in horizontally

2. Apply Snell's Law, which states: n₁ * sin(θ₁) = n₂ * sin(θ₂)
   Plug in the known values: 1.00 * sin(90) = 1.34 * sin(θ₂)

3. Calculate sin(θ₂):
   sin(90) = 1
   sin(θ₂) = 1 / 1.34 = 0.746

4. Determine the angle θ₂:
   θ₂ = arcsin(0.746) = 48.24 degrees

The diver under the water sees the sunset at an angle of approximately 48.24 degrees with respect to the vertical.

Learn more about Snell's Law:

https://brainly.com/question/2273464

#SPJ11

Answer:

14 cm

Explanation:

F = (frac{uv}{u – v})

F = +ve

v = -ve

30 = (frac {25 {times} (-v)}{25 – (-v)})

v = (frac {25 {times} (-v)}{25+v})

v = 14cm

(Note that either negative or positive values go to show the positioning and hence, they are not a strong necessity in your final answer.)

So happy that i could help you!

Now this question could turn out to be easy for you!!

The distance from the source to the reflector is approximately 171.5 meters when a sound wave leaves its source and is traveling through the air.

To determine the distance from the source to the reflector, we can use the speed of sound in air.

The speed of sound in air is approximately 343 meters per second at room temperature and normal atmospheric conditions.

Since the reflected wave returns 0.5 seconds later, it means that the sound wave traveled twice the distance from the source to the reflector.

Using the formula: Distance = Speed × Time, we can calculate the distance.

Distance = Speed of sound × Time

Distance = 343 m/s × 0.5 s

Distance = 171.5 meters

Learn more about waves at

https://brainly.com/question/29334933

#SPJ4

Answer:

Projectile motion is the motion of an object thrown or projected into the air, subject to only the acceleration of gravity. The object is called a projectile, and its path is called its trajectory. The motion of falling objects, as covered in Problem-Solving Basics for One-Dimensional Kinematics, is a simple one-dimensional type of projectile motion in which there is no horizontal movement. In this section, we consider two-dimensional projectile motion, such as that of a football or other object for which air resistance is negligible.

Explanation:

B the dropped ball

We are given the following information about an inelastic collision.

Mass of 1st object = 4 kg

Mass of 2nd object = 10 kg

Initial velocity of 1st object = 25 m/s

Final velocity of both objects = 14 m/s

Initial velocity of 2nd object = ?

In an inelastic collision, the momentum is conserved but the kinetic energy is not conserved.

Recall that the total momentum is conserved and given by

Let us substitute the given values and solve for initial velocity of the body (u2)

Therefore, the initial velocity of the body of mass 10 kg is 9.6 m/s

Answer:

When water freezes to form ice, the molecules would be vibrating in place rather than moving round. It is a result of a decrease in the kinetic energy of the molecules of water. It is said that the temperature and the kinetic energy of the molecules is directly proportional which means that when temperature is increased, the kinetic energy of the molecules would increase as well making the molecules move around. However for this case, when we day the system is cooled then it means the temperature is decreased which would result to the decrease of the kinetic energy of the molecules.

The white dwarf that remains when our Sun dies will be mostly made of

(b) carbon is correct option.

A star core remnant known as a white dwarf is primarily made up of electron-degenerate materials. White dwarfs are very dense objects with masses similar to the Sun and volumes similar to the Earth. White dwarfs do not undergo fusion, thus their feeble light is caused by the emission of leftover thermal energy. Sirius B, the smaller half of the Sirius binary star and the closest white dwarf to Earth, is 8.6 light years away. Among the 100 star systems closest to the Sun, eight white dwarfs are currently believed to exist. White dwarfs are unusually faint, and this was first noticed in 1910. Willem Lutyens first used the term "white dwarf" in 1922.

Since stars with very low masses cannot fuse helium, binary systems may experience mass loss that results in the formation of helium white dwarfs. In a white dwarf, the material no longer undergoes fusion processes, depriving the star of its energy source.

To know more about white dwarf

https://brainly.com/question/15598541

#SPJ4

An estimate of how much energy per year is needed for 1 gigawatt is approximately 31,536,000,000,000,000 joules (J) per year.

To estimate how much energy per year is needed for 1 gigawatt, we need to consider the unit of measurement for energy, which is joules (J).

A gigawatt is equivalent to 1 billion watts or 1,000,000,000 watts. To calculate the energy per year, we need to multiply this value by the number of seconds in a year.

There are 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day, and 365 days in a year.

So, 1 gigawatt x 1 year = 1,000,000,000 watts x 60 seconds/min x 60 minutes/hour x 24 hours/day x 365 days/year

= 31,536,000,000,000,000 joules (J) per year

Therefore, approximately 31,536,000,000,000,000 joules (J) per year  is an estimate of energy needed for 1 gigawatt.

For more such questions on energy, click on:

https://brainly.com/question/13881533

#SPJ11

We can solve this problem using the principle of conservation of momentum. The force required to keep the tanker at rest is approximately 407.99 N, assuming no other forces are acting on the tanker.

The momentum of the water jet leaving the tanker is equal and opposite to the momentum of the tanker.

Let the mass of water leaving the tanker per second be m, then:

m = 85 dm³/s = 85 kg/s (since 1 dm³ = 1 L = 1 kg)

The velocity of the water jet leaving the tanker is v = 4.8 m/s.

The momentum of the water jet is p = mv = (85 kg/s)(4.8 m/s) = 408 kg m/s.

To keep the tanker at rest, an equal and opposite force must be applied. Therefore, the force required is:

F = Δp/Δt = p/t

Since the momentum is constant, we can use the given rate of discharge to find the time it takes to discharge one second's worth of water:

t = m/v = (85 kg/s)/(4.8 m/s) = 17.71 s

Therefore, the force required is:

F = p/t = (408 kg m/s)/(17.71 s) = 23.05 N

However, the question asks for the force required to keep the tanker at rest, which is the opposite of the force exerted by the water jet. Therefore, the force required is:

F = -23.05 ₓ17.7 = -407.99 N (rounded to two decimal places)

Therefore, the force required to keep the tanker at rest is approximately 407.99 N, assuming no other forces are acting on the tanker.

To know more about principle of conservation of momentum

https://brainly.com/question/29044668

#SPJ4

The lens maker's equation, which states that a lens' focal length is the reciprocal of the sum of the subtraction of the object distance and the image distance, is the formula for lens.

An equation or expression that describes the connection between multiple variables is called a formula. Usually, an algebraic expression includes important for various constants, variables, and operations is employed to represent it. From the known values of other variables, it is used to determine the unused values of the variables.

1/f = 1/do + 1/di, where f is the focal length, do is the object distance, and di is the image distance, is a way to illustrate this equation. The focal length is shown by this formula.is inverse proportional to the sum of the distances here between object and the image.

To know more about Formula visit-

brainly.com/question/20748250

#SPJ4

The answer is

Pitch of the buzzer increased (higher tone) as it moves towards the observer

The correct option that explains the change in the observed pitch of the buzzer as it moves  towards the observer is;

A; pitch of the buzzer increased (higher tone) as it moves towards the observer

In conclusion, the pitch of the buzzer will increase as it moves towards the observer.

Read more at; https://brainly.com/question/3826119

Answer:

I am rich, I am that bi*ch. I am gonna go get that bag and I am not gonna take your ****

Explanation:

Unsaturated fats have one or more double bonds inside their fatty acid chains. The two carbons on the hydrocarbon molecules each have triple or double bonds, and hydrogens cannot saturate them. They are also liquid

The after 2.6 hours, the two airplanes are approximately 2167.3 meters apart.

The first step in solving this problem is to find the displacements of each airplane after 2.6 hours. To do this, we can use the formula: displacement = velocity * time.

For the first airplane, its velocity is given as m/h (although the specific value is missing). Let's assume its velocity is 600 m/h for example purposes. Thus, the displacement of the first airplane after 2.6 hours is: displacement = 600 m/h * 2.6 h = 1560 m.

Similarly, for the second airplane, its velocity is given as 580 m/h. Therefore, its displacement after 2.6 hours is: displacement = 580 m/h * 2.6 h = 1508 m.

To find the distance between the two airplanes, we can use the formula: distance = square root of (displacement1^2 + displacement2^2).

Substituting the values we found, the distance between the two airplanes is: distance = square root of (1560^2 + 1508^2) = square root of (2,433,600 + 2,270,064) = square root of 4,703,664 = 2167.3 m.

Therefore, after 2.6 hours, the two airplanes are approximately 2167.3 meters apart.

to learn more about velocity

https://brainly.com/question/34025828

#SPJ11

The ratio of the radius of the aluminum sphere to the radius of the lead sphere can be represented as:

\(\displaystyle \frac{r_{Al}}{r_{Pb}} =\sqrt[3]{\frac{\rho_{Pb}}{\rho_{Al}} }\)

The density of a material can be measured as the mass per unit volume of the material. The average density equals the mass divided by its total volume.

The mathematical formula for the density can be expressed as follows:

Density = Mass/Volume

The S.I. unit of the density that is used to measure is Kg/m³. If the size increases, the mass increases as well but the density remains constant.

Given the mass of the Al = mass pf the Pb

The ratio density of the Al and Pb can be represented as:

\(\displaystyle \frac{\rho_{Al}}{\rho_{Pb}} } = \frac{m/4\pi r_{Al}^3}{m/4\pi r_{Pb}^3}\)

\(\displaystyle \frac{\rho_{Al}}{\rho_{Pb}} } = \frac{ r_{Pb}^3}{r_{Al}^3}\)

\(\displaystyle \frac{r_{Al}}{r_{Pb}} =\sqrt[3]{\frac{\rho_{Pb}}{\rho_{Al}} }\)

Learn more about density, here:

brainly.com/question/15164682

#SPJ1

Answer:

apply more energy to the object with more mass

Explanation:

Explanation:

density= mass/volume

therefore;45.5/2.4

=19.0 g/cm³

The density of the given block is 18.35 g/cm³. The density of an object is defined as the ratio of its mass and volume.

the density of an object is defined as the ratio of its mass and volume.

\(\rho = \dfrac mv\)

Where,

\(\rho\)  - density

\(m\) - mass = 45.5 g

\(v\) - volume = 2.4 cm³

Put the values in the formula,

\(\rho = \dfrac {45.5}{2.4}\\\\\rho = 18.95 \rm \ g/cm^3\)

Therefore, the density of the block is 18.35 g/cm³.

Learn more about density:

https://brainly.com/question/25312421

Explanation:

Assuming the 10 m distance is the vertical displacement, the work done by both people is the same.

Work = force × distance

W = (250 N) (10 m)

W = 2500 J

The power of the first person is:

Power = work / time

P = 2500 J / 120 s

P = 20.83 W

The power of the second person is:

P = 2500 J / 60 s

P = 41.67 W

The moment of inertia of the pendulum about the pivot point is \(0.385 kg*m^2\)

A physical pendulum in the form of a planar object moves in simple harmonic motion when it oscillates about a pivot point, and the frequency of oscillation is determined by the moment of inertia of the pendulum about the pivot point.

The frequency of oscillation of the pendulum is given as 0.450 Hz. The moment of inertia of the pendulum I can be calculated using the equation:

\(I = m * L^2\)

where m is the mass of the pendulum and L is the distance from the pivot point to the center of mass.

In this case, the mass of the pendulum is 2.20 kg and the distance from the pivot point to the center of mass is 0.350 m, so the moment of inertia is:

\(I = 2.20 kg * (0.350 m)^2 = 0.385 kg*m^2\)

So, the moment of inertia of the pendulum about the pivot point is \(0.385 kg*m^2\)

To learn more about the moment of inertia:

https://brainly.com/question/14460640

#SPJ4