You paddle a conoe with a force of 325 N. You and the canoe have a combined mass of 250 kg. What is the acceleration of the canoe?

There are exactly three ways to move heat from one place to another:

-- conduction

-- convection

-- radiation

It is an insulator because it doesn't conduct electricty.

Answer: Option (B) is the correct answer.

Explanation:

A conductor is defined as a substance that allows flow of electrons through it due to which there will be flow of electric current.

Whereas an insulator is defined as a substance through which there will be very less or no flow of electrons. As a result, there will be no flow of electric current through it.

Also, when a material is covalently bonded then it means sharing of electrons has taken place between its atoms. And, covalent materials do not allow flow of electric current through it because of no presence of free electrons or ions.

Thus, we can conclude that the statement it is an insulator best describes a covalently bonded material.

40. 383 Hz, 0.9 m

6. 20.78 m/s

40. You know the pitch will be increased when the train is moving toward you. The only answer choice that is greater than 350 Hz is the one shown above.

Using the formula shown in the attachment, we compute the observed frequency to be ...

... f' = (343 m/s)/(343 m/s -32 m/s)×(350 Hz) ≈ 1.102893×350 Hz ≈ 386 Hz

The wavelength is given by ...

... λ = v/f = (343 m/s)/(386 Hz) ≈ 0.8886 m ≈ 0.9 m

_____

Comment on the answer choice

If you erroneously use the frequency modification formula f'=(v+vo)/v·f, then you get 382.7 Hz ≈ 383 Hz. We suspect an error in the answer key. Have your teacher show you how to work this problem.

__________

6. The velocity can be computed from the acceleration and distance covered by ...

... v = √(2ad)

... v = √(2·9.8 m/s²·22 m) = (√431.2) m/s ≈ 20.77 m/s

The closest answer among those offered is 20.78 m/s. Again, you should have your teacher show you how to work this problem to arrive at the offered answer.

One

I putting this up because I have answers. This is another doppler effect problem.

Givens

Formula

Solution

v= f * wavelength

v = 343 m/s

f = 386 Hz

343 = 386 * wavelength

343 / 386 = wavelength

wavelength = 0.881 m

Answer: 386, 0.9 C

Problem Two

Givens

Formula

Solution

Answer: A

Note to get 20.78 they used 9.8 but then there should only be 2 places and the answer (rounded) is 21. Otherwise the answer is 20.77

A. Decrease the rate of electrical flow

more resistance = lkess current

Answer:

If it is eight meters per second, and the total distance he has to travel is four hundred meters to complete the race, you divide the total length needed to travel by the average speed per second to see the amount of seconds required to complete the race at that speed.8 meters per second: Speed of runner400 meters: Total distance400/8=50.50 seconds to complete the race at the eight of 8m/s.

B The object is fallint with pressure pushing up, so 600N-200N=400N

Energy transferred into a machine equals energy transferred out of it (including waste heat generated by friction). (C)

The acceleration during the segment labeled "A" will be 4 [tex]ms^{2}[/tex].

The rate at which velocity changes is called acceleration. Acceleration typically indicates a change in speed, but still not necessarily.

The formula of  acceleration is Δv / Δt.

Where. v is velocity and t is time.

Acceleration can be determined by the the formula :

a = Δv / Δt. = 8 / 2 =  4 [tex]ms^{2}[/tex].

Therefore, the acceleration during the segment labeled "A" will be 4 [tex]ms^{2}[/tex].

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The answer would be atoms

Answer: The correct answer is Atom.

Explanation:

Atom consists of proton, electron, neutron and nucleus. The subatomic particles of the atom are electron, proton and neutron.

The electrons revolve around the nucleus while neutrons and protons are located in nucleus. The whole mass of the atom is supposed to be concentrated at nucleus.

The electron is negatively charged particle. The proton is positively charged particle. The neutron has no charge. It is neutral.

Therefore, the correct option is B.

Given data:

charge 1 (q₁) = 8.0 × 10⁻⁹ coulombs

charge 2 (q₂) = -1.4  × 10⁻⁸ coulombs

distance between fur and brush (r) = 5.0  × 10⁻¹ m

We know that,

           The couloumb's law describes the charge between two particles

Mathematically,

               F = k.(q₁ . q₂)/r²         ----------------------- (i)

             Where F = Force between particles

                         k = constant, 8.99 × 10⁹ Nm²/C²   -------------- (ii)

keep the charge, distance values and value of k in equation  (i), to determine the magnitude of force

                 F = 8.99 × 10⁹ ×{ (8.0 × 10⁻⁹) × ( -1.4  × 10⁻⁸)} / (5.0  × 10⁻¹)²

                    = -4.02 × 10⁻⁶  

The force is negative means "the force is attractive"

Answer:

120 Ns

Explanation:

The impulse exerted on an object is given by:

[tex]I=Ft[/tex]

where

F is the force applied

t is the time taken

In this problem, we have:

F = 40 N

t = 3.0 s

So, the impulse acting on the boat is

[tex]I=Ft=(40 N)(3.0 s)=120 Ns[/tex]

Answer:

120kg*m/s

Explanation:

Considering the equation for gravitational potential energy, PE=mgh, where m as mass, g as the acceleration due to gravity, and h has the height.

Substituting the numbers given, you’ll get (taking g as 9.81)

PE = 5 x 9.81 x 10

PE = 490.5 J

Therefore the gravitational potential energy will be 490.5 J

The gravitational potential energy of a 5kg object at a height of 10 meters is 490 Joules.

The gravitational potential energy of an object can be calculated using the formula U = mgh, where U is the gravitational potential energy, m is the mass of the object, g is the acceleration due to gravity, and h is the height of the object. In this case, we have a 5kg object at a height of 10 meters. Plugging the values into the formula, we get:

U = (5kg) * (9.8m/s^2) * (10m) = 490 J

Therefore, the 5kg object has 490 Joules of gravitational potential energy when it is 10 meters off the ground.

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Under the law of universal attraction:F=km₁m₂/r²=6.67*10⁻¹¹*7.347*10²²*47/3.844*10⁸=23.0321*10¹³/3.844*10⁸=5.99*10⁵≈6*10⁵ N

It's probably going to be a phase out of the approximations

To answer the question, we shall determine the kinetic energy of the automobile in each case. This can be obtained as illustrated below:

Mass (m) = 450 Kg

Velocity (v₁) = 26 m/s

KE₁ = ½mv₁²

KE₁ = ½ × 450 × 26²

KE₁ = 225 × 676

Mass (m) = 450 Kg

Velocity (v₂) = 30 m/s

KE₂ = ½mv₂²

KE₂ = ½ × 450 × 30²

KE₂ = 225 × 900

Finally, we shall determine the difference in the kinetic energy of the automobile. This can be obtained as illustrated below:

Kinetic energy of case 1 (KE₁) = 152100 J

Kinetic energy of case 2 (KE₂) = 202500 J

Difference = KE₂ – KE₁

Difference = 202500 – 152100

Therefore, the difference in the kinetic energy of the automobile is 50400 J

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The difference in the automobile's kinetic energy between the two velocities is -12.15 kJ.

The kinetic energy of an object is given by the formula KE = 1/2mv², where m is the mass of the object and v is its velocity. To find the difference in kinetic energy between two velocities, we can subtract the initial kinetic energy from the final kinetic energy. Given that the initial mass of the automobile is 450 kg and its initial velocity is 26 m/s, and the final velocity is 30 m/s, we can calculate the initial and final kinetic energies using the formula.

Initial kinetic energy = 1/2(450 kg)(26 m/s)² = 1/2(450 kg)(676 m²/s²) = 72900 J or 72.9 kJ.

Final kinetic energy = 1/2(450 kg)(30 m/s)² = 1/2(450 kg)(900 m²/s²) = 60750 J or 60.75 kJ.

Difference in kinetic energy = Final kinetic energy - Initial kinetic energy = 60750 J - 72900 J = -12150 J or -12.15 kJ.

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Answer:

1 %

Explanation:

The efficiency of a system is defined as the ratio between the energy produced and the energy in input:

[tex]\eta = \frac{E_{out}}{E_{in}}\cdot 100[/tex]

The same formula can also be rewritten in terms of the power produced and the power in input:

[tex]\eta = \frac{P_{out}}{P_{in}}\cdot 100[/tex]

Since in this problem we have:

[tex]P_{in}=100 W\\P_{out}=1 W[/tex]

The efficiency is

[tex]\eta = \frac{1 W}{100 W}\cdot 100[/tex]=1 \%

Final answer:

The efficiency of the system where a 100-watt light bulb illuminates a solar cell, which powers a water pump with a 1 watt output, is 1%.

Explanation:

The efficiency of the system is calculated by comparing the output power to the input power. In this case, if a 100-watt light bulb illuminates a solar cell and the electricity from the solar cell operates a water pump that delivers 1 watt of power, the efficiency (η) of the system can be found using the formula: η = (output power / input power) × 100%. Therefore, the efficiency of this system is (η = (1 W / 100 W) × 100%) which equals 1% efficiency. This is a simple calculation that demonstrates a common issue with energy conversion systems, where a lot of energy is often lost in the process of converting one form of energy to another, resulting in low conversion efficiency.

Since angles a and c are alternate interior angles formed by a transversal intersecting two parallel lines, they are congruent. Therefore, angle b must also be equal to angle c. So, the correct answer is: A) equal to Angle c

If angles "a," "b," and "c" are part of a triangle, then the sum of the interior angles of a triangle is always 180°. Given that angle "a" is 25°, the sum of angles "b" and "c" must be 180° - 25° = 155°.

With this constraint, we can't determine whether angle "b" is greater than, equal to, or less than angle "c" without additional information about their specific values. If one angle is specified, the other angle can be found using the fact that the sum of angles in a triangle is 180°. For example, if angle "c" is known to be, say, 70°, then angle "b" would be 155° - 70° = 85°.

In summary, the relationship between angle "b" and angle "c" depends on their specific values or additional constraints provided. Without this information, we cannot make a definitive comparison between them. Therefore, the correct answer to the given question would be that we cannot determine the relationship between angle "b" and angle "c" based solely on the measure of angle "a."

Some of the heavy particles bounced off the foil, because there are positive particles spread throughout the atom

Answer:

Some of the heavy particles bounced off the foil, because there is a dense, positive area in the atom.

Explanation:

In Rutherford experiment following is the observations made by the Rutherford

1). Major part of the alpha particles will go out undeviated which shows that major portion of the atoms vacant or empty space

2). Few part of the alpha particle moves out with deviation in path which shows that electrons moves in different shells and when alpha particles pass through a given electron then it will show the deviation in path

3). very few alpha particles will get deviated by 180 degree and returns to original path which shows the presence of nucleus. So nucleus is made up of positive charge which is concentrated at very small space

so here correct answer would be

Some of the heavy particles bounced off the foil, because there is a dense, positive area in the atom.

m = mass of the weight suspended = 1 kg

x₀= stretch in the spring at equilibrium = ?

k = spring constant of the spring = 50.0 N/m

using equilibrium of force ,

spring force on the weight = force of gravity on the weight

k x₀ = mg

50 x₀ = (1 x 9.8)

x₀ = 0.196 m

x = distance by which the weight is pulled below equilibrium = 0.50 m

a = acceleration of the weight

F = spring force on the weight in upward direction ,

force equation for the motion of weight is given as

F - mg = ma

k (x + x₀) - mg = ma

(50)(0.50 + 0.196) - (1) (9.8) = 1 a

a = 25 m/s²

Answer:

The vertical component of the velocity is about 16 m/s.

Explanation:

The vertical component is the magnitude of the velocity reduced by the sinus of the angle 53 degrees. So

[tex]v_y = |v|\cdot \sin 53^\circ = 20.0 \frac{m}{s}\cdot 0.7986 \approx 16.0 \frac{m}{s}[/tex]

Flowers that bloom during the winter.

Hope this helps and please mark as brainliest!

- JJ

The Flowers Blooming in Winter are: Acashia, Alstromeria, Amaryllis, Carnation, Chrysanthemums, Cyclamen, Evergreens, Gerbera Daisy, Ginger, Helleborus, Holly berry, Lily, Asiatic Lily, Casa Blanca Lily, Narcissus, Orchid, Pansy, Pepperberry, Phlox, Protea, Queen Ann's Lace, Roses, Star of Bethlehem, Statice.

a gas

hope this is right

the anser on apex is element

the answer is static friction

Answer:

Static friction.

Explanation:

I had this question, it was worded a bit differently. Hope this helped!

Answer:  True

The statement " the synthesis of a large collection of  information that encompasses well tested and verified hypothesis about certain aspects of natural world is known as "scientific theory".    

It was proposed by Charles Darwin and Alfred Russel in the mid 19th century.  

Typically, it is about the relationship between various facts and is a way of providing a concise explanation for what's been observed. A scientific theory is a well- substantiated explanation of an aspect of the natural world.

The average ear (Auris media) is the middle part of the ear and consists of the tympanic membrane, the Eustachio tube and the oval and round windows. In the tympanic cavity are contained the oscillations of the middle ear.  Timpan has the role of transforming the sounds collected by the external ear into vibrations, which are sent to the three oscillators (hammer, anvil and stair). In turn, they send the vibrations to the inner ear.

So the cochlea is not part of the average ear

The cochlea is not a bone in the middle ear; the three tiny bones are the malleus (hammer), incus (anvil), and stapes (stirrup), which transmit and amplify vibrations for hearing.

Among the options provided, the cochlea is not one of the three tiny bones in the middle ear. The three bones in the middle ear are known as the malleus (hammer), the incus (anvil), and the stapes (stirrup).

These bones are crucial for hearing as they work to transmit the vibrations from the tympanic membrane to the oval window of the cochlea. The hammer, anvil, and stirrup are the smallest bones in the body and help in amplifying and transferring sound waves into the inner ear.

Answer: C) heat

Explanation: As law of conservation of energy applies to all the systems, which says the energy cannot be created nor destroyed, it can only be converted from one form to another.

The light bulb converts electrical energy into light and heat energy.

A) chemical energy is stored in the bonds.

B) Light is a form of electromagnetic radiation.

D) nuclear energy is stored in the nucleus of the atom.

A) increase, warm... would correct.

The kinetic molecular theory says that as water molecules absorb energy, their motion and temperature INCREASE and the sample becomes WARM (Option A).

The kinetic molecular theory is a thermodynamic classical model used to explain the behavior of gases.

In conclusion, the kinetic molecular theory says that as water molecules absorb energy, their motion and temperature INCREASE and the sample becomes WARM (Option A).

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Answer:

54.4 m

Explanation:

The work done by the mother in pushing the carriage is equal to:

[tex]W=Fdcos \theta[/tex]

where

F is the force applied

d is the displacement of the carriage

[tex]\theta[/tex] is the angle between the direction of the force and the displacement

In this problem, we have the following data:

[tex]F=62.0 N[/tex] is the force

[tex]W = 2920 J[/tex] is the work done

[tex]\theta=30.0^{\circ}[/tex] is the angle between the direction of the force and the displacement

Re-arranging the equation above and substituting data, we find the displacement:

[tex]d=\frac{W}{F cos \theta}=\frac{2920 J}{(62.0 N)(cos 30^{\circ})}=54.4 m[/tex]

When a force is applied at an angle, we should consider the horizontal component of the force for any horizontal movement. In this case, the mother can push the baby carriage about 54.5 meters by expending 2920 Joules of work.

The subject of the problem involves the concept of work and force in physics. When the mother pushes the baby carriage at an angle, not all of the force she applies is used to move the carriage horizontal. We need to consider the horizontal component of the force which is 62.0N*cos(30.0º) = 53.61047 N. Work is defined as force times the distance over which the force is applied, or in this case, the force times the distance the carriage is pushed. The calculation looks like this:

Work = Force x Distance = 2920 J

Distance = Work / Force = 2920 J / 53.61047 N = 54.48013 m

So the mother can push the baby carriage approximately 54.48013 meters with an expenditure of 2920 joules of work.

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