Please help 25 points!

Three waves with frequencies of 1 Hertz (Hz), 3 Hz, and 9Hz travel at the same speed. Which of the following statements is correct?

A. The 1 Hz wave contains the most energy.

B. The crests of all three waves are of equal height.

C. The wavelength of the 9Hz wave is three times that of the 3 Hz wave.

D. The 1 Hz wave has the longest wavelength.

Answer: The planet Mars is terrestrial.

Terrestrial planets are made of rock, earth, or a solid substance. Your other options, Jupiter, Saturn, and Uranus, are all made up of a mixture of gases.

Hope this helps!

The answer is Mars.

Terrestrial planets are Earth-like planets made up of rocks or metals with a hard surface. Terrestrial planets also have a molten heavy-metal core, few moons, and topological features such as valleys, volcanoes, and craters.

Terrestrial planets are smaller, closer to the Sun, and formed from the rock around a molten metal core. They have secondary atmospheres, fewer moons, and a slower spin. Jovian planets are larger, further from the Sun, and formed from gases around a solid metal and hydrogen core.

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It is C) doing work because he is moving the bale of cotton.It only makes sense he is still doing work the pulley is just making it easier.

Answer:

* positive repulsion, which makes the electrons move as far away as possible

* Attraction with the core atomizes

he analysis is the foundations of quantum theorizing

Explanation:

Electrons are deposited in an atom following two principles.

* positive repulsion, which makes the electrons move as far away as possible

* Attraction with the core atomizes

The mathematical model used for the analysis is the foundations of quantum theorizing

Answer:

a) v = 3.57 m/s

b) N = 2.59 W

Explanation:

a) Maximum height, h = 65 cm = 0.65 m

The speed of the person at which he leaves the ground can be calculated by the equation of motion:

\(v^{2} = u^{2} + 2gh\)

u = 0 m/s

\(v^{2} = 0 + 2gh\\v^{2} = 2gh\\v^{2} = 2 * 9.8 * 0.65\\v^{2} = 12.74\\v = 3.57 m/s\)

b)

The displacement of the person when he jumps, S = 41 cm = 0.41 m

To calculate the acceleration of the person:

\(v^{2} = u^{2} + 2aS\\u = 0 m/s\\v^{2} = 2aS\\3.57^{2} = 2 * a * 0.41\\12.74 = 0.82 a\\a = 12.74/0.82\\a = 15.54 m / s^2\)

The force exerted by the person can be given as:

F = N - mg

N = Normal reaction ( the ground's force on him)

mg = W ( Weight of the person)

F = ma

ma = N - mg

Divide through by mg

\(\frac{ma}{mg} = \frac{N}{mg} - \frac{mg}{mg} \\\frac{a}{g} = \frac{N}{mg} - 1\\ W = mg\\\frac{a}{g} + 1= \frac{N}{W}\\\frac{15.54}{9.8} + 1 = \frac{N}{W}\\2.59 = \frac{N}{W}\\N = 2.59W\)

Answer:

Explanation:

We can approach this question from Newton's Law of Motion.

The first law states that an object will continue moving on a straight line until an external force is acted upon it . Now from the classical mechanics perspective ; if the net force on an object happens  to be zero, the body of such object typically implies to be at rest.

The second law of motion states that , the acceleration of an object is directly proportional to the force acting upon it but inversely proportional to the mass.

So; mathematically; we can  have:

\(\sum F = ma\)

Newton third law of motion states that for every action , there is equal  but an opposite reaction.

A

From the question;

The initial speed \(v_i =\)0

But the final speed can be determined by the using he following relation:

\(v_f^2 = v_i^2 +2a \Delta x \\ \\ v_f^2 = 0+2g \Delta x \\ \\ v_f^2 =2g \Delta x \\ \\ v_f^2 = 2*9.8*0.65 \\ \\ v_f^2 = 12.74m^2/s^2 \\ \\ v_f= \sqrt{12.74m^2/s^2} \\ \\ v_f= 3.569 \ m/s\)

B

To calculate the acceleration of the of the jumper ; we use the relation;

\(v_f^2 = v_i^2 +2a \Delta x \\ \\ v_f^2 = 0+2a \Delta x \\ \\ v_f^2 =2a \Delta x \\ \\ a= \dfrac{v_f^2}{2 \Delta x}\)

\(a= \dfrac{12.74}{2*0.41}\)

a = 15.533 m/s²

\(\sum F = ma\\ \\ F- W\)

By rearrangement and solving for F; we have:

F = ma + W

F = ma + mg

F = m(a+ g)

F = w/g (a+g)

F = w/9.8 m/s² ( 15.533 + 9.8)m/s²

F = w/9.8 m/s² (25.333)m/s²

F = 2.585 w

The average blood pressure in the brain will be higher than the average blood pressure in the feet. the average blood pressure in the brain will be lower than the average blood pressure in the feet.

When the elevator accelerates upward at \(10 ms^{-2}\), the blood pressure in the brain and feet of a person changes.

Similarly, when the elevator accelerates downward with the same acceleration, the blood pressure in the brain and feet of a person changes.

Let's discuss them one by one:Blood Pressure When Elevator Accelerates Upward at \(10 ms^{-2}\)

When the elevator accelerates upward at \(10 ms^{-2}\),  the blood pressure in the brain of a person increases, while the blood pressure in the feet of a person decreases.

This happens due to the gravitational force acting on the body.

Since the gravitational force on the head is greater than the gravitational force on the feet, the blood pressure in the brain increases while the blood pressure in the feet decreases.

Therefore, the average blood pressure in the brain will be higher than the average blood pressure in the feet.

Blood Pressure When Elevator Accelerates Downward at  \(10 ms^{-2}\) When the elevator accelerates downward at \(10 ms^{-2}\), the blood pressure in the brain of a person decreases, while the blood pressure in the feet of a person increases.

This also happens due to the gravitational force acting on the body. Since the gravitational force on the head is less than the gravitational force on the feet, the blood pressure in the brain decreases while the blood pressure in the feet increases.

Therefore, the average blood pressure in the brain will be lower than the average blood pressure in the feet.

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The owner's velocity is in the opposite direction of the combined velocity of the dog and the cat, and its magnitude is approximately 0.916 m/s.

To solve the given problem, we can use the principle of conservation of momentum to find the direction and magnitude of the owner's velocity.

Let's denote the velocity of the dog as v1 (northward), the velocity of the cat as v2 (eastward), and the velocity of the owner as v (unknown).

According to the conservation of momentum, the total momentum before the interaction is equal to the total momentum after the interaction.

The total momentum before the interaction is given by:

Total momentum before = (mass of the dog * velocity of the dog) + (mass of the cat * velocity of the cat) + (mass of the owner * velocity of the owner)

Mass of the dog (m1) = 24.4 kg

Velocity of the dog (v1) = 2.14 m/s

Mass of the cat (m2) = 5.53 kg

Velocity of the cat (v2) = 3.56 m/s

Mass of the owner (m3) = 78.5 kg

Velocity of the owner (v) = unknown

Total momentum before = (24.4 kg * 2.14 m/s) + (5.53 kg * 3.56 m/s) + (78.5 kg * v)

The total momentum after the interaction is zero since the owner has the same momentum as the pets taken together.

Total momentum after = 0

Equating the two expressions:

(24.4 kg * 2.14 m/s) + (5.53 kg * 3.56 m/s) + (78.5 kg * v) = 0

Simplifying the equation:

(52.216 kg·m/s) + (19.6488 kg·m/s) + (78.5 kg * v) = 0

71.8648 kg·m/s + (78.5 kg * v) = 0

Solving for v:

78.5 kg * v = -71.8648 kg·m/s

v = -71.8648 kg·m/s / 78.5 kg

v ≈ -0.916 m/s

Therefore, the direction of the owner's velocity is opposite to the combined velocity of the dog and the cat, and the magnitude of the owner's velocity is approximately 0.916 m/s.

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The effect of black papper on the field is that the black paper have a form of chimney effect. Thid is because the black paper heat up the space between the field and the body in order to allow an upward air current like a chimney. This air current adds to the cooling of the field.

Black paper absorb heat from the surrounding and generate it to current flow in the field.

A field refer to a egion in which each point has a physical quantity like time or gravitational or space which are connected and associated with the region.

Therefore, the black paper allow air current flow.

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We will have the following:

1. There are 5 nodes.

2. The harmonic shown is the 4th harmonic.

3. We will detemrine the 3rd harmonic as follows:

Answer:

In 1869 Russian chemist Dimitri Mendeleev started the development of the periodic table, arranging chemical elements by atomic mass. He predicted the discovery of other elements, and left spaces open in his periodic table for them.

Explanation:

Answer: Mendeleev first published a table of elements arranged according to increasing atomic masses. He noticed that some elements near each other had differing properties, but elements in vertical columns had similar properties. Moseley then rearranged the table according to atomic numbers and this eliminated the discrepancies found in Mendeleev’s attempt. Today’s version of the periodic table displays elements in order based on their atomic number; the atomic number indicates the number of protons within the atoms of a particular element. Rows are called periods and columns are called groups. Elements in the same group have similar properties. Elements are grouped into nine categories: noble gases, halogens, nonmetals, alkali metals, alkaline earth metals, transition metals, other metals, metalloids, and rare earth elements.

Answer:

0.58 L

Explanation:

For this problem we need to simply use the ideal gas equation to create a proportional comparison for the initial information to the final information.

(P_1 * V_1) / T_1 = (P_2 * V_2) / T_2

Using this, we can solve for V_2 to find the new volume of the gas once pressure and temperature changes.

(P_1 * V_1) * T_2 / T_1 = (P_2 * V_2)

(P_1 * V_1) * T_2 / (T_1 * P_2) = V_2

Consider our givens:

P_1 = 110atm

T_1 = 303K

V_1 = 2L

P_2 = 440atm

T_2 = 353K

Now we simply plug in these values to the equation to find the new volume, V_2.

(P_1 * V_1) * T_2 / (T_1 * P_2) = V_2

(110atm * 2L) * 353K / (303K * 440atm) = V_2

77660 atm*L*K / 133320 K*atm = V_2

0.583 L = V_2

Hence, the new volume is 0.583 L.

Cheers.

AnswerHM???

Explanation:

I dONT KNOW

The 3.831 MHz  frequency is required

What is amplitude?

The greatest displacement or distance that a point on a wave or vibrating body can travel in relation to its equilibrium position It is equivalent to the length of the vibration path divided in half.

What is inductor ?

When electricity is applied to an inductor, which is a passive component, it stores energy in the form of magnetic energy. In most power electronic circuits.

impendence

Z= V/I = 13.0V /(1.20*10⁻³A) = 10833Ω

inductive resistance

Xl= Z

2πfL = Z

f= Z/ 2πL = 10833Ω/ 2π (0.45*10⁻³ H) = 3.831*10⁻⁶= 3.831 MHz

Therefore, 3.831 MHz  frequency is required

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The unit vector of the forces is determined as (212.7i  +  208.24j  +  0k).

The x, y, and z component of the vectors is calculated as follows;

For vector 120 N, the x, y, and z component of the vectors is calculated as;

Ax = 120 N x cos (53) = 72.2 N

Ay = 120 N x sin (53) = 95.84 N

Az = 120 N x 0 = 0

For vector 100 N, the x, y, and z component of the vectors is calculated as;

Ax = 100 N x cos (40) = 76.6 N

Ay = 100 N x sin (40) = 64.3 N

Az = 100 N x 0 = 0

For vector 80 N, the x, y, and z component of the vectors is calculated as;

Ax = 80 N x cos (37) = 63.9 N

Ay = 80 N x sin (37) = 48.1 N

Az = 80 N x 0 = 0

The sum of the x, y and z components of the forces;

Fx = 72.2 N + 76.6 N + 63.9 N = 212.7 N

Fy = 95.84 N + 64.3 N + 48.1 N = 208.24 N

Fz = 0 N

[Fx, Fy, Fz] = (212.7i  +  208.24j  +  0k) N

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The complete question is below:

Three vectors with magnitudes 120N, 100N and 80N are given in the diagram below. Write them using the unit vectors i, j and k.

(120 N at 53⁰, 100 N at 40⁰ and 80 N at 37⁰)

Explanation:

density, mass of a unit volume of a material substance. The formula for density is d = M/V, where d is density, M is mass, and V is volume. Density is commonly expressed in units of grams per cubic centimetre.

The relative density of a substance is defined as the ratio of the density of that substance to the density of water at 4oC. It is also defined as the ratio of the mass of substance to the mass of equal volume of water at 4oC. i.e., R.D. = Mass of the substance / mass of an equal volume of water at 4oC

the frequency is 30Hz

The physics behind the movement of electric charges between parallel plates is based on the principles of electrostatics. Electric charges are either positive or negative, and they are affected by electric fields.

Electric fields are created by a difference in electric potential, which is measured in volts. When a voltage is applied to a set of parallel plates, the charges within the plates will be affected by the electric field, and will move in response to it.

When a voltage is applied to a set of parallel plates, the positive charges in the plate connected to the positive voltage will be attracted to the negative voltage, while the negative charges in the plate connected to the negative voltage will be attracted to the positive voltage.

The movement of charges between the plates is also affected by the presence of any obstacles or resistances in the electric field, such as resistance in the wire. This can slow down the movement of charges and result in a decrease in the current flowing through the circuit.

In all, the movement of charges between electric parallel plates is the result of the electric field created by a difference in electric potential, and the movement of charges is called drift velocity. The movement is also affected by the presence of resistance.

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Answer:

Solids - Bricks , wood , Pottery, Bucket

Liquid - Water, soap, Sanitizers.

Gases - Aerosol in Deodorants, Chlorofluorocarbons in Fire extinguishers , Butane in lighters.

Answer:

Independent, then dependent

Explanation:

Just took this on Edge 2021

Answer:

Option B. A convex mirror forming a smaller, virtual image.

Explanation:

The diagram above illustrate the formation of image by a convex mirror.

The image formed by a convex mirror has the following characteristics:

1. The image is always formed behind the mirror.

2. The image is always virtual.

3. The image is always erect.

4. The image is always diminished i.e smaller than the object.

A careful observation of the diagram above shows that the mirror is a convex mirror as the outer surface is the reflecting part and the inside surface of the spherical part is silvered or polished.

Now, since the mirror is convex mirror, therefore, the image formed by the mirror will be smaller and virtual as explained above.

Answer:  A concave lens forms a smaller, virtual image

Explanation:

4.3.2 introduction to optics A P E X

Answer:

approximately 7 seconds

Explanation:

The given scenario is just an example of Projectile Motion.

In this question, we are given:

- Initial Velocity (u) = 40 m/s

- Angle of Elevation (θ) = 60 degrees

- Distance of Bird (s) = 145 meters        [Not used for the time of flight]

Time of Flight:

\(T = \frac{2uSin(\theta)}{g}\)

we will use g = 9.8 m/s/s since we are not told otherwise.
\(T = \frac{2(40)Sin(60 degrees)}{9.8}\)

\(T = \frac{40\sqrt{3}}{9.8}\)

T = 4.081(√3) seconds
rounded to 7 seconds

The mechanical advantage of ramp A is greater than others and it will require the least force to move the load to greater distance.

The mechanical advantage of the ramp is calculated as follows;

\(M.A = \frac{L}{h}\)

The mechanical advantage of the ramp B, C, D and E is calculated as;

\(M.A = \frac{L}{h} \\\\\)

The mechanical advantage of the ramp A is calculated as follows;

\(M.A = \frac{2L}{h} \\\\M.A = 2(\frac{L}{h} )\)

Since the length of the ramp A is greater than other ramps, the mechanical advantage will be greater and it will require the least force to move the load to greater distance.

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Answer:Newton's first law of motion indicates that an objects motion or lack of motion will stay the same unless acted upon by an unbalanced force.

Explanation:

(a) The magnitude of the acceleration of the electron is 5.62 x 10¹³ m/s².

(b) The speed of the electron after the given time is  4.78 x 10⁵ m/s.

The acceleration of the electron is calculated as follows;

F = qE

ma = qE

a = qE/m

a = (1.6 x 10⁻¹⁹ x 320)/(9.11 x 10⁻³¹)

a = 5.62 x 10¹³ m/s²

v = at

v = 5.62 x 10¹³ m/s² x  8.50 x 10⁻⁹ s

v = 4.78 x 10⁵ m/s

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Answer:

Fp = 36 N

Fq = 58 N

Explanation:

Let the left end be the reference end with string p closest to it.

Let CCW moments be positive

Sum moments about p to zero

1(9.8)[2 - 1] + Fq[6 - 2] - 5(9.8)[8/2 - 2] - 1.5(9.8)[5 - 2] - 2(9.8)[7 - 2] = 0

                                                                              Fq[4] = 23.5(9.8)

                                                                                  Fq = 57.575 ≈ 58 N

Sum moments about q to zero

1(9.8)[6 - 1]  - Fp[6 - 2] + 5(9.8)[6 - 8/2] + 1.5(9.8)[6 - 5] - 2(9.8)[7 - 6] = 0

                                                                                                     Fp = 35.525 N

or

Sum vertical forces to zero

Fp + 57.575 - (9.8)(1 + 1.5 + 2 + 5) = 0

Fp = 35.525  ≈ 36 N

These fish have food. Yellowtail snapper, algae, stoplight parrotfish, shrimp, crabs, and worms Sponges, the queen angelfish Grouper from Nassau: Various fish.

All parrotfish species on coral reefs have the critical duty of preventing algae from outpacing reef-building corals. Wake Atoll's reef environment is kept healthy and diverse by bumphead parrotfish (Photo by Andrew E. Gray/NOAA Fisheries).

Up to 90% of the time, parrotfish graze on the corals' overgrowth of algae, which helps to keep the ecological balance between the two groups of species in good shape.

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The pushing force she exerts on the sled is equal to the frictional force the ground exerts on the sled.

In the video, the girl pushed her brother on the sled at a constant velocity, which means the forces acting on the sled must have balanced. Therefore, the pushing force the girl exerted must have been equal to the frictional force that the ground exerted on the sled.

This is because, according to Newton's Third Law of Motion, for every action there is an equal and opposite reaction. In this case, the action is the girl pushing the sled, and the reaction is the frictional force exerted by the ground on the sled. Since the sled is moving at a constant velocity, this means that the forces acting on it are balanced, and therefore the pushing force and the frictional force must be equal.

In equation form, this can be represented as:
F_push = F_friction

Where F_push is the pushing force exerted by the girl, and F_friction is the frictional force exerted by the ground.

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Answer:

5.95 m

Explanation:

Given that the biggest loop is 40.0 m high. Suppose the speed at the top is 10.8 m/s and the corresponding centripetal acceleration is 2g

For the car to stick to the loop without falling down, at the top of the ride, the centripetal force must be equal to the weight of the car. That is,

(MV^2) / r = mg

V^2/ r = centripetal acceleration which is equal to 2g

2 × 9.8 = 10.8^2 / r

r = 116.64 /19.6

r = 5.95 m

Weight is best defined as C) the force of gravity on an object.