A flight attendant pulls her 66 N flight bag a distance of 318 m along a level airport floor at a constant velocity. The force she exerts is 43 N at an angle of 52 above the horizontal.
(a) Find the work she does on the flight bag.
(b) Find the work done by the force of friction on the flight bag.
(c) Find the coefficient of kinetic friction between the flight bag and the floor.

Answer:

it is applicable on all bodies having mass and the bodies Will be governed by the same law

Answer:

Antoine Lavoisier

Explanation:

For someone with a negative Weber slope for weight detection, it would be easier to tell the difference between 20 pounds and 21 pounds.

The Weber's Law states that the just noticeable difference (JND) between two stimuli is proportional to the magnitude of the stimuli. A negative Weber slope indicates that the JND decreases as the magnitude of the stimuli increases. In this case, as the weight increases, the person's ability to discriminate between the weights becomes easier.

Therefore, option C, telling the difference between 20 pounds and 21 pounds, would be easier for someone with a negative Weber slope for weight detection.

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Answer:

option D

Explanation:

five

hope it helps you and Mark me down as brainlist

In this exercise we have to know the fitness zones and know their quantity, so we have five fitness zones.

Fitness zones are 5 scale divisions that determine the effort range, the first being the lightest and the fifth the most intense. In a nutshell, they help determine when the effort is light, moderate, or strong.

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Answer:

Forty-eight million eight hundred thousand

Explanation:

You divide 585.6/12. I really hope this helps!!

Force(F) = 350 N

Work (W)= 0 J

Apply the formula:

Work = Force x Distance

Isolate distance(d)

Distance = Work/ Force

d = W/F = 0 /350 = 0 m

The distance that the object traveled is 0 (zero)

Answer:

p(momentum) = mass(kg) x velocity (m/s)

Answer:

Explanation:

I FOUND YOUUU

Answer:

300,000

Explanation:

right here dad_0 ;) u got  snap?

It means that waves will pass through the material. When a material transmits waves, it allows the waves to travel through it without significantly altering their properties.

This is different from materials that reflect waves, which cause the waves to bounce off the surface, or materials that absorb waves, which cause the waves to stop and transfer their energy to the material.

Materials that transmit waves are often transparent or translucent, allowing light waves to pass through them and be seen on the other side. Examples of materials that transmit waves include glass, air, and water.

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It is possible to predict the speed that a coaster will reach before it is ever placed on the track  by using the conservation of energy principle.

The principle of energy conservation states that energy can neither be created nor destroyed. It may transform from one form to another form.

Just like in roller coaster, velocity at the maximum height is predicted by using this principle. At the maximum height, potential energy is maximum and kinetic energy is minimum.

Thus, It is possible to predict the speed that a coaster will reach before it is ever placed on the track  by using the conservation of energy principle.

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Answer:

Below

Explanation:

To convert mm to m all you need to do is divide the value by 1,000

so : 3 / 1,000 = 0.003 meters

Hope this helped!

The acceleration of the block is 6.4 m/s².

To calculate the acceleration of the block, we need to consider the forces acting on it.

The applied force is 40 N, and since it is the only horizontal force in the direction of motion, it is the net force acting on the block.

The frictional force opposing the motion is 8 N.

The acceleration, we can use Newton's second law, which states that the net force acting on an object is equal to its mass multiplied by its acceleration (F = ma).

The net force is the difference between the applied force and the frictional force:

40 N - 8 N = 32 N.

Now, we can plug the values into Newton's second law:

32 N = 5 kg × a.

Solving for the acceleration (a), we get

a = 32 N / 5 kg

a = 6.4 m/s².

Therefore, the acceleration of the block is 6.4 m/s².

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Answer:

217 N

Explanation:

Answer:217N

Explanation:

Given:

The charge is q1 = 9.4 nC

The charge q2 = -2.31 nC

The distance between them is r = 4.94 cm

To find the electric field strength at the midpoint between two charges.

Explanation:

The electric field strength at the midpoint will be the sum of electric field strength due to q1 and q2.

The electric field strength can be calculated by the formula

Here, k is the electrostatic constant whose value is

The electric field strength due to the charge q1 is

The electric field strength due to the charge q2 is

The electric field strength at the midpoint will be

Thus, the electric field strength at the midpoint between the two charges is 173000 V/m

The gain of the parabolic reflector antenna at 20 GHz is approximately 1744.4.

The gain of a parabolic reflector antenna can be computed using the following formula:

G = (π * D_eff / λ)² × η

where G is the gain of the antenna, D_eff is the effective aperture diameter, λ is the wavelength of the signal, and η is the efficiency of the antenna.

Given that the physical aperture diameter is 1.22m and the effective aperture is 55% of the physical aperture, we can calculate the effective aperture diameter as follows:

D_eff = 0.55 × 1.22m = 0.671m

At 20 GHz, the wavelength of the signal can be calculated as follows:

λ = c / f

where c is the speed of light (299,792,458 m/s) and f is the frequency of the signal in Hz.

λ = 299,792,458 / (20 x 10^9) = 0.01499m

Substituting these values into the formula for gain,

G = (π × 0.671m / 0.01499m)² × η

Efficiency of 60%, we can calculate the approximate gain as,

G ≈ (π × 0.671m / 0.01499m)² × 0.6 = 1744.4

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--The complete question is, The effective aperture of a 1.22m diameter parabolic reflector antenna is 55% of the physical aperture. compute the gain at 20 GHz. Efficiency is 60%.--

Answer:

I think 1. is 17 and 2. is 600

Explanation:

sorry its been a while..

The average torque exerted on the wheel as it slows down has magnitude of 1.0 Nm

The rotational kinetic energy equation relates the rotational kinetic energy of an object to its moment of inertia and angular velocity. The work-energy theorem states that the work done on an object is equal to the change in its kinetic energy. We are given the radius of the wheel, its moment of inertia, and its initial angular speed.

We are also told that the wheel stops rotating after 6 seconds due to friction in the axle, which exerts a torque on the wheel. Using the rotational kinetic energy equation, we can calculate the initial rotational kinetic energy of the wheel. We can then use the work-energy theorem to find the work done by the frictional torque, which is equal to the change in the wheel's rotational kinetic energy.

Rotational inertia(I) = 2 kg m²

Radius (r) = 0.33 m

Initial angular speed W0 = 3 rad/s

time to stop (t) = 6 s

Angular acc. (α) = ?

We know that,

W = W₀ + at

0 = 3 - a × 6

a = 3/6

a = 1/2 rad/s²

   Average Torque = I*α

      Torque = 2 * 1/2 Nm

      Torque = 1 Nm

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The closer together a magnet's magnetic field lines are, the stronger the magnetic field in that region.

The density or proximity of magnetic field lines represents the strength and intensity of the magnetic field produced by the magnet.

In regions where the magnetic field lines are close together, it indicates a concentrated and strong magnetic field. This implies that the magnetic field has a higher magnitude and can exert a greater force on magnetic materials or charged particles within that region.

Conversely, when the magnetic field lines are spaced farther apart, it indicates a weaker magnetic field. The density of field lines decreases, suggesting a lower strength and intensity of the magnetic field.

The pattern and distribution of magnetic field lines around a magnet provide a visual representation of the magnetic field's strength and direction. The closer the field lines, the stronger the magnetic field, and the farther apart they are, the weaker the magnetic field.

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Answer:

Answer

Advantages of alcohol over Mercury

(a) Freezing point of alcohol is −117∘

C and hence can record very low temperature For example in Arctic and Antarctic regions temperature may fall below −80∘

C which cannot be measured by mercury thermometer because mercury freezes at−39 ∘ C

(b) The expansion of alcohol per degree rise in temperature is much more around six times more then that of mercury and hence is more sensitive

(c) it can be coloured brightly by adding some dye in it and hence is easily detectable

The sign of the wave-function is crucial to understand the chemical bonding of two or more atoms. It is responsible for providing stability and the formation of covalent bonds. Covalent bonds are characterized by the sharing of electrons between two or more atoms to achieve a stable state.

The two hydrogen atoms share an electron in their 1s orbital. When the two atoms approach each other, their 1s orbitals overlap, and the wave-function of each electron combines. This combination of wave-function occurs because of the Schrödinger wave equation.

The significance of the sign of the wave-function is that it determines the probability of an electron's presence in a particular area around the nucleus of an atom. The Schrödinger wave equation is sensitive to the sign of the wave-function because the wave-function squared gives the probability density of the electron's presence.

Therefore, when two atoms come together to form a bond, the sign of the wave-function becomes critical. If the signs of the wave-function for the two hydrogen atoms are the same, the probability of the two electrons sharing space increases, which results in a stable molecule. If the signs of the wave-function are different, the probability of electron sharing decreases, which results in an unstable molecule.

A sketch can be helpful to understand the concept of covalent bonding. When two hydrogen atoms come together to form a molecule, they share an electron in their 1s orbitals, resulting in a stable molecule. A sketch will provide a visual representation of the sharing of electrons between the two atoms.

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a) The sample mean of the commute times for the 12 employees is 24.25 minutes. The population mean of the commute times for all employees of the large company is unknown.

b) The estimated margin of error of the sample population, using standard deviation, is approximately 6.542 minutes.

a) To find the sample mean, we sum up all the commute times of the 12 employees and divide by the sample size: (31 + 10 + 13 + 42 + 20 + 23 + 23 + 27 + 25 + 31 + 18 + 13) / 12 = 291 / 12 = 24.25 minutes.

As for the population mean, it is not provided in the question. The population mean represents the average commute time for all employees in the large company but is unknown in this case.

b) To estimate the margin of error using standard deviation, we first need to calculate the standard deviation of the sample. The standard deviation measures the dispersion of data points around the mean.

Using the sample data, we find the standard deviation to be approximately 7.161 minutes.

Next, we divide the standard deviation by the square root of the sample size to calculate the standard error: 7.161 / √12 ≈ 2.073 minutes.

The estimated margin of error is then obtained by multiplying the standard error by the appropriate critical value.

Assuming a 95% confidence level, which corresponds to a critical value of approximately 1.96 for a large sample size, we multiply 2.073 by 1.96 to obtain the estimated margin of error: 2.073 × 1.96 ≈ 4.06 minutes.

Therefore, the estimated margin of error for the sample population, using standard deviation, is approximately 6.542 minutes (24.25 ± 4.06).

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The moment of inertia will increase by a factor of 4. Answer: B. 4.

The moment of inertia of a uniform thin disk rotating about its center is given by the formula:

I = \((1/2)MR^2\)

where M is the mass of the disk and R is the radius of the disk.

If the diameter of the disk is doubled, then the radius will also double. Therefore, the new moment of inertia will be:

I' =\((1/2)M(2R)^2 = 2MR^2\)

The ratio of the new moment of inertia to the original moment of inertia is:

I'/I = \((2MR^2) / ((1/2)MR^2) = 4\)

Therefore, the moment of inertia will increase by a factor of 4. Answer: B. 4.

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Answer:

we can't balance this because there are no atoms of oxygen in the product side

A market value of a good or service means current price of a good or service.

option D.

Market value is the price of commodity or materials, such as an asset that's determined by the supply and demand of the asset in the marketplace.

The economic value represents the maximum amount a customer is willing to pay for something.

Also, market value is the highest price that a willing buyer will pay for a good or service and the lowest price at which a willing seller will sell his or her services.

So from the given options we can see that a market value of a good or service means current price of a good or service.

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Answer:

Point number 3.

Explanation:

Volcanism can be studied to found out evidence of the internal structure of the Earth.

Answer:

Volcanism

Explanation:

Answer:

The balloon will continue to expand and eventually burst.

Explanation:

Simply, the reason for this is because the density of the atmosphere decreases gradually as you increase in altitude closer to space. This means that the air on the outside of the balloon can't provide enough pressure over the surface of the balloon in order to counteract the gas on the inside of the balloon from expanding.

The height of the meatball in air after 2.3 seconds is 123.32.

Height can be defined as the vertical distance between two points

To calculate the height of the meatball after 2.3 seconds, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the height of the meatball in air after 2.3 seconds is 123.32.

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Answer:

whrn a human breath it absorb15 % of oxygen whereas when a bluewhale breathes it can absorb 90% and breath out 10 %

There are some similarity between some natures of blue whales and humans. Both are respring from air. Similarly the immunity systems and chewing mood of food in both have slight similarities.

Blue whales are fish like organisms living in deep oceans or seas. They are the known largest animal in the world. Blue whales are mammals and not like other small aquatic organisms.

The immunity system in blue whales are similar to those of humans. And moreover some studies shows that their tRNA genes functions similar to those in human.

Blue whales breathe from air and not from the water. Similarly they chew food sometimes similar to humans. Some studies have reported that the evolution of humans and blue whales had exhibited some common factors with respect to the survival and immunity.

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The acceleration is of mother before child reaches half a revolution is,
a) 0.42 radians per second squared b) 0.42 radians per second squared

If both are moving in the same direction, the relative velocity of the child with respect to the mother is the angular velocity of the carousel, which is 2π radians per minute. The mother needs to cover the same distance as the child in half the time, so her relative velocity with respect to the child must be twice the angular velocity of the carousel, which is 4π radians per minute.

To calculate the required acceleration, we can use the formula: acceleration = (final velocity - initial velocity) / time. Since the mother starts from rest and reaches a velocity of 4π radians per minute, the final velocity is 4π radians per minute. The time to cover half a revolution is 30 seconds. Therefore, the acceleration required for the mother to catch up with the child is,

acceleration = (4π - 0) / 30 = 4π/30 ≈ 0.42 radians per second squared

If both are moving in opposite directions, the relative velocity of the child with respect to the mother is the sum of their individual angular velocities. Since the mother is moving in the opposite direction to the carousel, her angular velocity is -2π radians per minute. Therefore, the relative velocity is (2π - (-2π)) = 4π radians per minute.

Using the same formula as before, the acceleration required for the mother to catch up with the child is,

acceleration = (4π - 0) / 30 = 4π/30 ≈ 0.42 radians per second squared

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--The complete question is, A carousel completes 1 revolution every minute. A mother realizes that her child is about to fall and starts moving to protect him when the child already has a 90-degree lead. What acceleration must she reach to catch up with him before the child completes half a revolution? a) If both are moving in the same direction? b) If both are moving in opposite directions?--

Answer:

The tangential acceleration is 0 m/s².

Explanation:

Answer:

The tangential acceleration is 0 m/s².

Explanation: