a river has a constant current of 3 kph. at what angle to a boat dock should a motorboat maitining a constant speed

(a) The man comes to a halt in 1.99 ms = 1.99 × 10⁻³ s, so his average acceleration slowing him from 6.33 m/s to a rest is

a = (6.33 m/s - 0) / (1.99 × 10⁻³ s) ≈ 3180 m/s²

so that the average net force on the man during the landing is

F = (70.8 kg) a ≈ 225,000 N

i.e. with magnitude 225,000 N.

(b) With knees bent, the man has an average acceleration of

a = (6.33 m/s - 0) / (0.147 s) ≈ 43.1 m/s²

and hence an average net force of

F = (70.8 kg) a ≈ 3050 N

(c) The net force on the man is

∑ F = n - w = m a

where

n = magnitude of the normal force, i.e. the force of the ground pushing up on the man

w = the man's weight, m g ≈ 694 N

m = the man's mass, 70.8 kg

g = mag. of the acceleration due to gravity, 9.80 m/s²

a = the man's acceleration

Using the acceleration in part (b), we have

n = m g + m a = m (g + a)

n = (70.8 kg) (9.80 m/s² + 43.1 m/s²) ≈ 3740 N

Answer:

The correct answer is D)

Explanation:

When an electric magnet is brought near a cord with an electric current, the cord will most likely deflect away from the magnet because electric fields flowing through a wire generates its own magnetic field.

Cheers!

Answer:

only you are in motion

Explanation:

it is because the ground causes friction to make you stop but you are the object in motion :)

When you run, your feet are pushing you forward. Friction keeps your foot in contact with the ground. According to Newton's third law, you are pushing the ground back but the earth does not change its position because the mass of the earth is huge as compared to your mass.

Newton's third law of motion explains that forces exist in pairs. It states that for every action force there exists equal and opposite reaction forces, these pairs of forces are equal in magnitude but opposite in direction.

As given in the problem when you run, your feet are pushing you forward. Friction keeps your foot in contact with the ground. According to Newton's third law, you are pushing the ground back.

Your feet propel you ahead as you run. Your foot remains in contact with the ground thanks to friction. Newton's third law states that even though you are pushing the ground back, the earth does not move since it has a much larger mass than you have.

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The bowling ball will experience less acceleration then baseball.

Newton's second law of motion states that the acceleration of an object is directly proportional to the force applied to it and inversely proportional to its mass. Mathematically, this can be expressed as:

F = ma

where F is the force applied, m is the mass of the object, and a is the resulting acceleration.

In the given scenario, both the bowling ball and baseball are thrown with the same force. However, since the bowling ball has a larger mass than the baseball, according to Newton's second law, it will experience less acceleration than the baseball. This means that the correct answer is (D) less acceleration.

Therefore, the acceleration of an object is not only determined by the force applied to it but also by its mass. Objects with greater mass require more force to accelerate at the same rate as objects with lesser mass.

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Answer:

the product of mass and velocity

....in my syllabus

The coil's induced emf is measured at a value of 1386T.  According to Faraday's rule, the quantity of, or the amount of induced emf, is equal to the number of coil turns times sub B over t, where sub B, as we've seen, can be represented as B times A.

The magnetic flux rate of change divided by the coil's turn count yields the induced emf in a coil.

Change of magnetic flux through a coil of wire = B -A

                                                            = 70Wb - 52Wb

                                                             = 18Wb

The magnetic flux in one turn of the coil = ϕ = BA

= 18*77

=1386T

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Answer:

The law of conservation of mass is a fundamental principle of physics. According to this law, matter can be neither created nor destroyed. In other words, the mass of an object or collection of objects never changes, no matter how the parts are rearranged.

Hope it helps!!!

Answer:

their will be no change in this..

The law of conservation of mass is a fundamental principle of physics. According to this law, matter can be neither created nor destroyed. In other words, the mass of an object or collection of objects never changes, no matter how the parts are rearranged.

A one-time pad is a type of encryption that is completely unbreakable if it is done correctly. It works by generating a random key that is at least as long as the message being encrypted. The key is then combined with the message using an XOR operation.

This produces a ciphertext that cannot be decrypted without the key. The key is used only once and then discarded, hence the name "one-time pad". A one-time pad is completely unbreakable because there is no pattern to the key that can be used to decrypt the message. Each character in the key is generated randomly and independently of the other characters. Therefore, the key is completely unpredictable. Even if an attacker knows the key length and has access to the ciphertext, they cannot use any techniques to decrypt it.

This is because there is no pattern to the ciphertext that can be used to determine the key.The only way to decrypt a one-time pad is to have the key. If an attacker tries to brute-force the encryption by trying all possible keys, they will generate every possible message that is the same length as the original message. This means that the ciphertext is completely meaningless without the key. It is therefore important to keep the key secret and ensure that it is only used once. ,Message: yellow stone Key: wolf To encrypt the given message using the vigenere cipher, we follow the steps below:Step 1: Write the message and key in a tabular form as shown below. To keep the process organized, we use the letters of the key to label the columns.

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From what I have seen, you do not take your step sis out of the washing machine, you ask her if she has games on her phone and play mine craft like a god obv.

In CSI detectors, there is very little light spread.

The light spread causes a decrease in resolution. Therefore, it is necessary to prevent light from spreading in the detectors to maintain the desired level of resolution. This is achieved by using a specialized type of detector known as a crystalline needle detector. Crystalline needles are used to block light from the detector. These needles are made from a material that is transparent to x-rays but opaque to visible light. As a result, the needles allow x-rays to pass through them and reach the detector while blocking any visible light that may cause a reduction in resolution. The x-rays that are detected by the detector are converted into an electrical signal. This is done by using a scintillator, which is a material that absorbs x-rays and emits visible light in response. The light emitted by the scintillator is then detected by a photodiode, which converts it into an electrical signal. This signal is then processed by a computer to create an image of the object being scanned. In conclusion, the use of crystalline needle detectors in CSI is critical in ensuring that the desired level of resolution is maintained. By blocking any visible light that may cause a decrease in resolution, these detectors help to produce high-quality images of the object being scanned. The conversion of x-rays into an electrical signal through the use of a scintillator and a photodiode is also important in producing clear and accurate images.

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Answer:

i) Power = Force * Velocity = 1100 * 15 = 16500 W = 16.5 kW(ii)  Find the value of k first: F = 400 + k(15^2)                                              k = 28/9    F = 400 +(28/9)(30^2) = 320

Explanation:

The speed and time have a linear relationship. It is independent of mass. The upper limit is a)Mg/c and b)gt.

What exactly does acceleration mean?

A moving material experiences acceleration when its speed and trajectory vary over time. When anything moves quicker or longer, it is said to have been accelerated. Rotation on a circle accelerated despite the same speed since this heading is always changing.

What causes a speedup?

An object's motion is influenced by a net force; the larger the net force, the greater the acceleration. Greater net pressures are needed for more massive things to accelerate at the same rate as less massive things.

Briefing:

a) lim t-->∞  v = mg/c

 mg/c is the limit

2)It is the rate at which the item gets closer as time passes.

b) lim c-->0^(+)   v = gt.

 gt is the limit

3)The speed and time have a linear relationship. It is independent of mass. Since mass has no bearing on acceleration, an item will fall faster the longer it is in free fall.

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Answer:

There is no force in space.

Explanation:

Weight is the gravitational force acting on the mass as in space there is no gravity so weight appeares as zero

Answer:

It is because of gravity that your weight of a certain mass becomes zero in space.

Explanation:

The electric field strength at a distance of 1.20 m on the x-axis is -1.5 × 10⁴ N/C.

To find the electric field strength at a distance 1.20 m on the x-axis, we can use Coulomb's law:

\($$F=k\frac{q_1q_2}{r^2}$$\)

where F is the force between two charges, q1 and q2 are the magnitudes of the charges, r is the distance between the charges, and k is the Coulomb constant.For a single point charge q located at the origin of the x-axis, the electric field E at a distance r is given by:

\($$E=\frac{kq}{r^2}$$\)  where k is the Coulomb constant.

So, let's calculate the electric field due to each charge separately and then add them up:

For the +2.0 C charge at x = 0, the electric field at a distance of 1.20 m is:\($$E_1=\frac{kq_1}{r^2}=\frac{(9\times10^9)(2.0)}{(1.2)^2}N/C$$\)

For the -3.0 C charge at x = 0.40 m, the electric field at a distance of 1.20 m is:

\($$E_2=\frac{kq_2}{r^2}\)

\(=\frac{(9\times10^9)(-3.0)}{(1.20-0.40)^2}N/C$$\)

The negative sign indicates that the direction of the electric field is opposite to that of the positive charge at x = 0.

To find the net electric field, we add the two electric fields\(:$$E_{net}=E_1+E_2$$\)

Substituting the values of E1 and E2:

\($$E_{net}=\frac{(9\times10^9)(2.0)}{(1.2)^2}-\frac{(9\times10^9)(3.0)}{(0.8)^2}N/C$$E\)

net comes out to be -1.5×10⁴ N/C.

Therefore, the electric field strength at a distance of 1.20 m on the x-axis is -1.5 × 10⁴ N/C.

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Answer: Electromagnetic waves can transfer energy through empty space.

Explanation:

Electromagnetic waves are formed when an electric field comes in contact with a magnetic field. The electric field and magnetic field of an electromagnetic wave are perpendicular to each other. They are also perpendicular to the direction of the wave.

Electromagnetic waves travel with speed of light in vacuum.

Electromagnetic wave does not need a medium to propagate or travel from one place to another. Electromagnetic waves are 'transverse' waves which means that they are measured by their amplitude and wavelength.

Electromagnetic waves do not lose energy when they travel and thus can travel far from its source.

Answer:

C.

Electromagnetic waves can transfer energy through empty space.

Explanation:

cause i dont need one

Speed will it strike the positive plate 74.736*10^6 m/s

r = distance = 3.7 mm

a) E = electric field between plates =

E =  38*10^-6  / 8.85*10^-12

   = 4.293*10^6 N/C

from E = -dV / dr

dV = potential difference .  take magnitude:

dV = E*dr

   = 4.293*106*3.7*10-3

   = 15.887 *103V

b) from F ( force) = q*E

also F = ma

so                 ma = qE

a( acceleration) = qE/ m

q = charge on electron, m= mass

a  = 1.6*10^-19*4.293*10^6 / 9.1*10^-31

a = 7.548*1017 m/s2

u = initial velocity = 0 m/s ( at rest)

V = final velocity= ?,           S = distance = r = 3.7 mm

v^2 = u^2+2as

putting values we get

Speed will it strike the positive plate 74.736*10^6 m/s

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The speed of man when the length of his shadow on the building decreases when he is 4 m from the building will be 0.6 m/sec.

The change of distance with respect to time is defined as speed. Speed is a scalar quantity. It is a time-based component. Its unit is m/sec.

Distance from spot shines =  12 m away

Height of man,h=2 m tall

Speed of man +1.6 m/s,

Distance from the building = 4 m

Let the height of shadow= y,

CD=x

Height of man=2 m

Speed of man:

\(\rm \frac{dx}{dt} = 1.6 \ m/sec\)

As the triangle ABD and ECD are similar. The property of the similarity is found as;

\(\rm \frac{y}{2} = \frac{12}{x} \\\\ xy = 24\)

Differentiate the above question with respect to x;

\(\rm x \frac{dy}{dt}+y\frac{dx}{dt}=0 \\\\ x\frac{dy}{dt}= -y\frac{dx}{dt}\)

From the given conditions the man is 4 m from  the building the value of the remaining distance x is;

x=12-4

x=8 m

Speed of man:

\(\rm \frac{dx}{dt} = 1.6 \ m/sec\)

On putting all the values we get;

\(\rm \frac{y}{2} = \frac{12}{x} \\\\ xy = 24 \\\\ 8y = 24 \\\\ y= 3\)

The speed of man when the  length of his shadow on the building decreases when he is 4 m from the building;

\(\rm \frac{dy}{dt} = - \frac{3}{8} \times 1.6 \ m/sec \\\\\ \frac{dy}{dt} = 0.6 \ m/sec.\)

Hence the value of the speed for the given conditions willl be 0.6 m/sec.

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A multimodal text is composed of multiple modes of communication. For example, written words, images, or spoken words, like in a movie or a presentation on a computer. A multimodal presentation includes at least one mode other than reading and writing, such as listening, speaking, viewing, or performance.

Multimodal texts consist of picture books, textbooks, compelling novels, comics, and placard. These texts convey meaning to the reader through various combinations of visual (still image) description and spatial modes. Multimodal does not necessarily imply the use of technology. Multimodal text can be paper, live, or digital. Paper-based multimodal texts include picture books, textbooks, graphic novels, comics, and posters. 

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Rocks with a silica content of around 70% and composed primarily of quartz and feldspars are at the light-colored extreme. Granitic rock refers to these rocks.

Amorphous silicon dioxide, or SiO2, is employed in microsystems as a structural or sacrificial layer in many micro - milling techniques, as a dielectric in capacitors and transistors, as an insulator to isolate various electronic parts, and in other applications.

In order to alter the rheological behaviour of cement systems, increase the reactivity of supplemental cementitious materials, and increase the strength and durability, SiO2 nanoparticles were utilised.

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The descriptions of object's motion with the position-time graph that represents at:

D. speeding up - Graph 1

C. not moving - Graph 2

B. moving with constant speed - Graph 2

A. slowing down - Graph 3

Motion is the conceptual notion in which an object moves from its position with respect to time. Motion is acceptable to be described in terms of displacement, distance, velocity, acceleration, speed.

Furthermore, Motion is a change in an object's position over time. It is the result of forces acting upon an object, and can be described in terms of distance, speed, and direction.

Therefore, it is a change of position or orientation of a body with the change of time. looking at the attached graph, it can then be concluded that the correct answers are as given above

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Answer:

A:True It is good too monitor your grades because you can keep track of your grades and pinpoint your weaknesses.

Explanation:

Answer:

True, monitoring your grades can help you understand your weaknesses as a student.

The height of the building if a ball is thrown upwards at 6m/s from the top of the building is 102.48m.

The height of the building in this question can be calculated using one of the equations of motion as follows:

s = ut + ½at²

Where;

According to this question, a ball is thrown upwards at 6.00 m/s from the top of a building. If the ball hits the ground 4.00 seconds after you throw the ball, the height can be calculated as follows:

s = 6 × 4 + ½ × 9.81 × 4²

s = 24 + 78.48

s = 102.48m

Therefore, 102.48m is the height of the building.

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The vector equations for the electric field E⃗ (z,t) and magnetic field B⃗ (z,t) can be written as follows:

E⃗ (z,t) = E0 sin(kz - ωt) ẑ

B⃗ (z,t) = B0 sin(kz - ωt) ỵ

The vector equations for the electric field E⃗ (z,t) and magnetic field B⃗ (z,t) can be written as follows:

E⃗ (z,t) = E0 sin(kz - ωt) ẑ

B⃗ (z,t) = B0 sin(kz - ωt) ỵ

Where E0 and B0 are the maximum amplitudes of the electric and magnetic fields, respectively, k is the wave number, ω is the angular frequency, and ẑ and ỵ are unit vectors in the z and y directions, respectively.

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The angular momentum of the object relative to the origin is \((4.13 kgm^{2/s})i - (4.13 kgm^{2/s})j\)

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The work done in stretching springs is 12 joules.

We need to know about the work on stretching springs to solve this problem. Work can be determined by how much potential energy on springs changes

W = ΔPE

W = 1/2 . k . (Δx)²

where W is work, PE is potential energy, k is spring constant and x is position.

Work also depends on the restoring force which has formula

F =  k . Δx

Hence, by substituting force we can use this formula

W = 1/2 . F . Δx

From the question above, we know that:

Δx = 0.5 m

F = 48 N

By substituting the parameter, we get:

W = 1/2 . F . Δx

W = 1/2 . 48 . 0.5

W = 12 Joule

Hence, the work done in stretching springs is 12 joules.

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Since Two pulses are moving along a string, Mu response is Yes, there be an instance in which the wave interference is at the same level as point X because there will be an overlap  in the way of the slope of the waves.

When two pulses collide to produce a bigger pulse, this is called constructive interference. The two beginning pulses' amplitudes are added to create the size of the final pulse.

Note also that if two waves collide while moving across the same medium, wave interference is the result. The medium assumes a shape as a result of the net impact of the two distinct waves on the medium's particles due to wave interference.

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See full question below

Two pulses are moving along a string. One pulse is moving to the right and the second is moving to the left. Both pulses reach point X at the same instant.Will there be an instance in which the wave interference is at the same level as point X?

Answer:

t = 1.24 seconds

Explanation:

Given that,

Velocity of the ball, u = 30 m/s

Height, h = 45 m

We need to find how much time will it take the ball to reach a height of 45 m. Let the time be t.

Using the second equation of motion to find it.

\(h=ut+\dfrac{1}{2}at^2\\\\45=30t+\dfrac{1}{2}\times 9.8\times t^2\\\\45=30t+4.9t^2\\\\30t+4.9t^2-45=0\\\\t=1.24\ s\ \text{and}\ -7.36\ s\)

Neglecting negative value,

The ball will reach to a height of 45 m in 1.24 seconds.

Answer:

vector quantity............

Explanation:

Mark me braimlist

Answer:

scalar

Explanation:

Two 0.425 kilogram soccer balls are attracted to one another by a gravitational force with an intensity of  \(F =4.82*10^{-5}\).

We must apply the equation shown below to calculate the gravitational force (F), All objects with mass are attracted to one another by the gravitational attraction, which has a magnitude that is directly proportional to the masses of the two objects and inversely proportional to the square of their distance from one another.

Therefore, the only unit left is meters kilograms per second squared, which is equal to newtons. Therefore, the gravitational force between the Earth and the Moon is 1.98 x 10^(-20) newtons.

Here magnitude in terms of force:

\(F=Gm_{1} m_{2}/r^{2} \\F = (6.67*10^{-11} * 0.425* 0.425)/0.5^{2} \\F =4.82*10^{-5}\)

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Given,

The length of the pipe, L=1.8 m

Speed of the sound, v=340 m/s

To form the standing wave with the longest wavelength, the number of nodes of the thus formed standing wave should be equal to 1.

The wavelength of the standing wave created in a closed-end pipe is given by,

On substituting the known values,

Thus the longest possible wavelength is 7.2 m

The frequency of this standing wave is given by,

On substituting the known values,

Thus the frequency of this standing wave is 47.22 Hz.