if a tent is touched with a finger on inner surface , when it is raining , it allows the rain water to leak through. give a reason for this observation

Answer:

6 seconds

Explanation:

We will have that the magnitude of the force required is:

So, it will need at least 98 N to keep it from moving downwards.

Answer:

3586

Explanation:

by using formula s=it+0.5at^2

Answer:

\(\fbox {Velocity = 60 m/s, Distance = 3600 m}\)

Explanation:

Part (i) : Velocity at end of 2 minutes

Equation used ⇒ \(\boxed {v = u + at}\)

⇒ t = 2 minutes = 2 x 60 = 120 seconds

⇒ v = 0 + (0.5)(120)

⇒ v = 60 m/s

Part (ii) : Distance covered

Equation used ⇒ \(\boxed {S = \frac{v^{2}-u^{2}}{2a}}\)

⇒ S = (60)² - (0)² / 2(0.5)

⇒ S = 3600 m

Answer:

Well if they playing a game like that

Answer:

The correct option is;

B. Subtract vectors A from C; \(F_{Net}\) = 12 N

Explanation:

The given parameters are;

The weight of the dresser = 250 N

The force applied by the man = 20 N = C

The frictional force provided by the carpet = 8 N = The component of the weight resisting motion = A

Therefore, the net force tending to put the dresser in motion, \(F_{Net}\), is given as follows;

\(F_{Net}\) = The force applied by the man, C - The frictional force provided by the carpet which is the component of the weight resisting motion, A

\(F_{Net}\) = C - A = 20 N - 8 N = 12 N

\(F_{Net}\) = 12 N

The resulting net force, \(F_{Net}\) = 12 N.

The resultant force can be obtained by subtracting vector C from Vector A and the value of net force is 12 N. Hence, option (C) is correct.

Given data:

The weight of man is, W = 250 N.

The magnitude of applied force is, F = 20 N.

The magnitude of frictional force is, f = 8 N.

As per the given problem and the diagram let the applied force be denoted by vector A, Then,

Magnitude of Vector A = 20 N

And the frictional force be denoted by vector C. Then,

Magnitude of Vector C = 8 N

We know that the role of frictional force is to oppose the motion or to oppose the effect of applied force. Then the resultant force is given as,

\(F_{net} = F-f\\\\F_{net} = 20 - 8\\\\F_{net} = 12 \;\rm N\)

Thus, we can conclude that the resultant force can be obtained by subtracting vector C from Vector A and the value of net force is 12 N. Hence, option (C) is correct.

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Answer:

Kinetic?

Explanation:

Sammy is combing his hair. During combing, his hair starts to stand on end as energy is transferred to its static electricity store. This energy is transferred due to the friction.

Static electricity is developed by the imbalance of electric charges within the surface of a material or between the two materials. The charge remains on the surface until it is able to move away by an electric current or electrical discharge of electrons.

When a person combs his/her hair, negative charged particles i.e., electrons leave the hair and transfer to the plastic comb. The comb which is covered in negatively charged particles, then becomes negatively charged, and the hair are left with a positive charge due to loss of electrons.

Static electricity develops when a person runs a plastic comb through his/her hair, then place the comb near small pieces of paper. The paper pieces are attracted to the comb in contact. This attraction is because of the charged comb that induces an opposite charge in the paper, these opposite charges are attracted to each other, and therefore the paper sticks to the comb.

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The first reason is that in the past humans didn't necessarily see the connections between the oceans and thus labelled them that way separating them into 5 oceans and the names stuck to this day.

Secondly, while all the oceans of the world constitute one large Ocean, people need some way to identify each part of it since it is easier to think when we have different categories instead of one large category.

Hope that helped!

Answer:

63 J

Explanation:

Efficiency = work out / work in

0.84 = W / 75 J

W = 63 J

Answer:

  a =  3,0 m/s²

Explanation:

En este ejercicio se pide calcular la aceleracion del cuerpo, usemos las ecuaciones de cinematica en una dimensión.

          v= v₀ + a t

como el corredor parte del reposo si velocidad inicial es cero

           v =  at

           a = v/t

calculemos

          a = 12 /4,0

          a =  3,0 m/s²

When you walk, you are more likely to be able to walk at a constant velocity. Your walking speed varies as you walk in real-life scenarios, but you aim to maintain a steady pace or velocity. This is how you can keep track of time and distance traveled.

When you walk at a constant velocity, you move forward with a steady speed and direction. The velocity is defined as the rate at which an object's position changes with respect to time. When you walk, you typically aim to move forward with a constant velocity, which is the speed at which you walk and the direction you walk. In certain situations, a constant velocity is ideal, such as when you are traveling long distances and want to arrive at your destination at a certain time. To ensure that you walk at a constant velocity, you need to maintain a steady pace by keeping your stride consistent and avoiding unnecessary stops or changes in direction. Walking with a constant velocity involves maintaining a steady speed and direction. It is possible to achieve this by maintaining a constant pace, keeping your stride consistent, and avoiding any unnecessary stops or changes in direction.

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Acceleration = (force) / (mass)

Acceleration = (6.81 x 10⁻³ N) / (252 kg)

Acceleration = 2.70 x 10⁻⁵ m/s²

Time = (change in v) / (acceleration)

Time = (262 m/s) / (2.70 x 10⁻⁵ m/s²)

Time = 9,703,704 seconds

That's  2,695.5 hours , or  112.3 mean solar Earth days .

Radiographic rooms equipped with a tilting table are primarily designed for performing fluoroscopic procedures.

Fluoroscopy is a medical imaging technique that uses X-rays to produce real-time images of the inside of a patient's body. It involves the use of a continuous X-ray beam to create an image that can be viewed on a monitor. Radiographic rooms equipped with a tilting table are designed to support fluoroscopy procedures, which involve examining areas of the body in motion.

The tilting table allows for various angles of viewing and positioning, enabling the medical practitioner to obtain a clear and detailed image. Some of the common fluoroscopic procedures that are performed in these rooms include gastrointestinal studies, arthrography, urologic studies, and vascular studies. In conclusion, radiographic rooms equipped with a tilting table are primarily designed for performing fluoroscopic procedures.

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The speed of light waves travel in air is 3.0 * 10⁸ m/s, while the speed of sound waves in air at 25° C is 346.3 m/s.

Light waves travels 8.66 * 10⁵ times faster in air in comparison to sound waves in air.

The speed of light in water is 3.0 * 10⁸ m/s while the speed of sound in water is 1.481 m/s

The distance covered by a wave per second is known as the wave speed.

The speed of a wave varies according to the density of the medium it is travelling as well as the due to the frequency of the wave.

The speed that light waves travel in air = 3.0 * 10⁸ m/s

The speed that sound waves travel in the air at 25° C = 346.3 m/s

The ratio of the speed of speed that light waves travel in air to that of the speed that sound waves travel in the air at 20° C = 3.0 * 10⁸/346.3 = 8.66 * 10⁵

Therefore, light waves travels 8.66 * 10⁵ in the air in comparison to sound waves in air

The speed of light in water = 3.0 * 10⁸ m/s

The speed of sound in water = 1,481 m/s

Therefore, light waves travels much faster water than sound waves in water.

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The percentage contribution of the elastin towards the total force assuming elastic behavior will be 100%.

To calculate the percentage contribution of elastin towards the total force assuming elastic behavior, we need to know the total force and the contribution of elastin to the total force.

Let's assume that the total force is F_total and the contribution of elastin to the total force is F_elastin. In an elastic behavior, the force exerted by elastin is directly proportional to the amount of deformation or stretch, given by Hooke's law, which is, F_elastin = k × x

where k is the spring constant of the elastin and x is the amount of deformation or stretch.

If we know the spring constant of the elastin and the amount of deformation or stretch, we can calculate the force exerted by the elastin.

Assuming that there are no other significant sources of force in the system, we can say that the total force is equal to the force exerted by the elastin:

F_total = F_elastin

Therefore, F_total = k × x

To calculate the percentage contribution of elastin towards the total force, we can use the following formula;

Percentage contribution of elastin = (F_elastin / F_total) × 100%

Substituting F_elastin and F_total from the above equations, we get:

Percentage contribution of elastin = (k × x / k × x) × 100%

The k × x term cancels out, leaving us with:

Percentage contribution of elastin = 100%

This means that in an elastic system where the only significant source of force is elastin, the total force is entirely due to the force exerted by the elastin.

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Answer:

The last option, 20 N and 2.04 kg

Explanation:

work = (force)(distance)

work = 120 joules

distance: 6 m

rearrange to find force:

120=(6)F

F= 120/6 = 20 Newtons.

Assuming its lifted from Earth's surface, the force of gravity will be 9.81 m/s^2. Let's find mass:

F=mg

m=F/g

m=(20)/(9.81)= 2.038 kg

The cork leaves the spring at a speed of 3.02 m/s.

We can use the conservation of energy to determine the speed at which the cork leaves the spring.

The initial potential energy stored in the spring is converted to the kinetic energy of the cork as it leaves the spring. Neglecting air resistance, the conservation of energy equation is:

(1/2) k x^2 = (1/2) m v^2

where k is the spring constant, x is the distance the spring is compressed, m is the mass of the cork, and v is the speed of the cork as it leaves the spring.

Substituting the given values:

(1/2) * 18 N/m * (7.47 cm / 100 cm/m)^2 = (1/2) * 0.009 kg * v^2

Solving for v:

v^2 = (18 N/m * (7.47 cm / 100 cm/m)^2) / 0.009 kg

v^2 = 9.119 m^2/s^2

Taking the square root of both sides:

v = 3.02 m/s

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Answer:

When a proton is placed directly in the path of the proton cannon, it will experience a strong electromagnetic force. The proton cannon emits a beam of protons at high energy and velocity. When the proton in the path of the cannon interacts with the beam, there will be a collision between the two protons.

During the collision, the protons may undergo a process called scattering, where they change direction and momentum. The exact outcome of the collision depends on the energy and angle of the incoming proton, as well as the properties of the target proton. It is possible that the protons may scatter off each other, transferring energy and momentum in the process.

In some cases, the collision may result in the absorption of the incoming proton by the target proton. This can lead to the formation of a more massive particle or the emission of other particles. The specifics of the interaction will depend on the energy and conditions of the proton cannon and the characteristics of the protons involved.

Overall, placing a proton directly in the path of a proton cannon will result in a collision and potential scattering or absorption of the protons, causing changes in their momentum and possibly leading to the creation of other particles.

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Answer:

1/2 m v^2 = G M m / R         speed of object at surface of earth

v^2 = 2 G M / R        escape speed needed

V = 3 v     if original speed = 3 * escape speed

v^2 / 9 = 2 G M / R

v^2 = 18 G M / R    where v is initial speed

v^2 = G M / R  * (18 - 2) = 16 G M / R     very far from earth

v = (16 G M / R)^1/2

v = (16 * 6.67E-11 * 5.98E24 / 6.37E6)^1/2

v = 31650 m/s = 19.7 mi/sec

When a particle is projected from the surface of Earth with a speed equal to 3 times the escape speed, its final speed when very far from Earth will be 2 times the escape speed.

The escape speed is the minimum speed required for an object to overcome Earth's gravitational pull and move indefinitely away from it.

When a particle is projected with a speed 3 times the escape speed, it has more than enough energy to escape Earth's gravity.

As the particle moves away from Earth, it loses some of its kinetic energy due to Earth's gravitational force. Eventually, when the particle is very far from Earth, it will have lost an amount of kinetic energy equal to the escape speed.

Summary: When a particle is projected with a speed 3 times the escape speed and reaches a point very far from Earth, its speed will be 2 times the escape speed.

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The negative sign on the values of the current, magnetic field, and magnetic moment indicates that they are in the opposite direction to that of the electron's motion.

In a simplified model of the hydrogen atom, an electron moves with a speed of 1.09 × 10^6 m/s in a circular orbit with a radius of 2.12 × 10^-10 m. We are to determine the time interval for one trip around the circle, the current corresponding to the electron's motion, the magnetic field at the center of the circular orbit, and the magnetic moment of the atom. Calculation of time interval for one trip around the circle. The distance covered by the electron in one trip around the circle is the circumference of the circle. That is,2πr = 2π(2.12 × 10^-10 m) = 1.338 × 10^-9 m.The time interval for one trip around the circle can be determined using the formula for the speed of the electron: v = distance/time interval

Thus, time interval = distance/v

= 1.338 × 10^-9 m/1.09 × 10^6 m/s

= 1.23 × 10^-15 s

Calculation of the current corresponding to the electron's motion, The current I is given by:

I = q/t, where q is the charge on the electron and t is the time interval for one trip around the circle. The charge on the electron is -1.6 × 10^-19 C. Thus,

I = -1.6 × 10^-19 C/1.23 × 10^-15 s

= -1.30 × 10^-4 A

Calculation of the magnetic field at the center of the circular orbit. The magnetic field at the center of the circular orbit can be determined using the formula:

B = μ₀I/2r

where μ₀ is the permeability of free space and r is the radius of the circle.

μ₀ = 4π × 10^-7 T m/A, I

= -1.30 × 10^-4 A, and

r = 2.12 × 10^-10 m.

Thus,B = (4π × 10^-7 T m/A)(-1.30 × 10^-4 A)/(2(2.12 × 10^-10 m))

= -3.03 × 10^-5 T

Calculation of the magnetic moment of the atomThe magnetic moment of the atom is given by the product of the current I and the area of the circle, A. That is,μ = IA

where I is the current and A is the area of the circle.

A = πr^2

= π(2.12 × 10^-10 m)^2

= 1.41 × 10^-19 m^2

Thus,μ = -1.30 × 10^-4 A × 1.41 × 10^-19 m^2

= -1.84 × 10^-23 J/T

The negative sign on the values of the current, magnetic field, and magnetic moment indicates that they are in the opposite direction to that of the electron's motion.

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Answer:

1040

Explanation:

The rules for significant digits is that non-zero digits are significant figures. The  zero in between 1 and 4 is significant because any zeroes between two significant digits are significant. Trailing zeroes if there is no decimal point are insignificant.

The number 1045.2 rounded to three significant digits would be 1040 because the rightmost zero is not a significant digit.

In positional notation, significant figures refer to the digits in a number that is trustworthy and required to denote the amount of something, also known as the significant digits, precision, or resolution.

The definition of a significant digit according to the criteria is a non-zero digit. Any zeroes between two significant digits, such as the one between 1 and 4, are noteworthy. In the absence of a decimal point, trailing zeroes are not relevant.

According to the criteria for significant digits, non-zero digits are important numbers. The zero between 1 and 4 is crucial, as is any zero between two significant digits. The trailing zeroes are irrelevant if there is no decimal point.

Thus, the number 1045.2 rounded to three significant digits would be 1040.

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The statement "heat rises" is not accurate in explaining the temperature decrease with altitude.

The main reason why it is colder at higher altitudes is because of the decrease in air pressure with increasing altitude. As air rises in the atmosphere, the pressure decreases, and this decrease in pressure is accompanied by a decrease in temperature. It is known as adiabatic cooling.

When air molecules rise to higher altitudes, they expand due to the lower atmospheric pressure. As the air expands, it does work against the surrounding air molecules, leading to a decrease in its internal energy and, consequently, a drop in temperature. This adiabatic cooling causes the temperature to decrease with increasing altitude.

In summary, the decrease in temperature with higher altitudes is primarily due to adiabatic cooling resulting from the expansion of air as it rises and experiences lower atmospheric pressure.

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Answer:

Here's a rough diagram for this question!

The scale I used is 1cm = 5000N.

So, 20000N = 4 cm & 30000N = 6cm.

To find the magnitude of the resultant force, draw a straight line from one corner of the parallelogram to the other end and measure the line. From the diagram, mine would be around 10cm. So, based on the scale I used, 10cm would be 50000N. Therefore, the resultant force is 50000N!

For the angle between the resultant force, I got around 13°-14°!

I hope this helps!

EDIT: My bad, I just noticed I wrote 2000N on my pic loll, thats supposed to be 20000N.

Answer:

10.6 s

Explanation:

Given that a girl is running the 200 m dash. She starts by acceleration at 8m/s^2 for 7s. Then continues at this speed until the end of the race. How long did it take for her to complete the race?

Solution.

If she accelerated for 7s, the velocity at which she accelerated will be:

Acceleration = velocity/time

8 = V/7

Make V the subject of the formula by cross multiplying.

V = 8 × 7

V = 56 m/s

She maintains the speed through out the journey.

Speed = distance/time

Make time the subject of formula

Time = distance/speed

Time = 200 / 56

Time = 3.57s

Therefore, she will complete the race by 7 + 3.6 = 10.6 s

Answer:

An isolated system is a single object that doesn't interact with any other objects. An isolated system has constantly changing energy. As a member, you'll also get unlimited access to over 79,000 lessons in math, English, science, history, and more.

Explanation:

An isolated system is a system in which the mass and energy are not allowed to escape.In open system, energy and mass can transfer and in closed system, only energy can transfer but the mass is conserved.

For an isolated system, the statement "total energy and mass are conserved" should be correct.

Therefore, for an isolated system, the statement "total energy and mass are conserved" should be correct.

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In a downward direction, the magnitude of the acceleration is negative and velocity is zero.

Here,

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The determination of orbital periods cannot be made with certainty unless the mass of the central object or the orbital velocities are known.

By obtaining 8 diverse imageries within the span of 80 days, it is possible to monitor the advancement of every item.

The duration of an object's orbit can be approximated if it completes a whole revolution within that time. If an object manages to complete two complete revolutions within a span of 80 days, then a rough estimate of its period is approximately 40 days.

If images covering one full orbit for each object are not available, precise periods cannot be determined using this method, and only an approximation can be obtained.

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The first radio wave with a frequency of 1000 kHz has a wavelength of 300 meters, while the second radio wave with a frequency of 80 MHz has a wavelength of 3.75 meters. Longer wavelengths, such as that of the first radio wave, can penetrate deeper into the ocean compared to shorter wavelengths. This is because longer wavelengths have less energy and are less likely to interact or get absorbed by the water molecules. However, it's important to note that even the longer wavelength radio wave will eventually experience attenuation as it travels through the ocean due to the absorption and scattering properties of water.

To find the wavelength of a radio wave, we can use the formula: wavelength = speed of light / frequency. The speed of light in a vacuum is approximately 3 x 10^8 meters per second.

For the first radio wave with a frequency of 1000 kHz (1000 x 10^3 Hz), the wavelength can be calculated as follows: wavelength = (3 x 10^8 m/s) / (1000 x 10^3 Hz) = 300 meters

For the second radio wave with a frequency of 80 MHz (80 x 10^6 Hz), the wavelength can be calculated as follows: wavelength = (3 x 10^8 m/s) / (80 x 10^6 Hz) = 3.75 meters

The wavelength of the first radio wave is much longer than that of the second radio wave. In general, longer wavelengths can penetrate deeper into materials compared to shorter wavelengths. This is because longer wavelengths have less energy and are less likely to interact or get absorbed by the particles in the medium.

In the context of the ocean, the longer wavelength of the first radio wave (300 meters) allows it to penetrate deeper into the water compared to the second radio wave (3.75 meters). Therefore, the first radio wave can travel further and deeper into the ocean before its energy gets significantly attenuated or absorbed by the water molecules. However, it's important to note that even the longer wavelength radio wave will eventually experience attenuation as it travels through the ocean due to the absorption and scattering properties of water.

In summary, the wavelength of a radio wave affects its ability to penetrate into a medium, and in the case of the ocean, a longer wavelength can allow the radio wave to travel deeper before its energy is diminished.

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The work done to stretch the spring from 16m to 19m will be 18 Joules and the natural length with which a force of about 72 N is used to keep the spring stretched will be 7.5m.

Spring force can be defined as the force which acts in the opposite direction to the displacement of the object. In order to stretch or compress the spring some amount of work has to be done. Which is given as,

where k = spring constant of the spring

         x = compression of spring

         W= Work required or spring work

Initial length is given by 9m

final length is given by  11m

When spring is stretched change in the length occurs denoted by x

x = final length - initial length = (11 - 9) = 2m

W = 1/2Kx²

W = 1/2 K (2)²

8×2 = 4K

16/4 = K

K = 4 N/m

(a) work is needed to stretch the spring from 16m to 19m

stretching length from 16 to 19m will be 3m

stretching length from cm to 30 is 40 cm is 10 cm which is 0.1m

x = final stretch of the spring = 16 - 19 = 3m

Work needed to stretch the spring from 16m to 19m is given

W = (0.5)K(3²)

W = (0.5)(4)(3²)

W = 2.0 × 9

W = 18 Joules

x is stretch of the spring beyond natural length

F = force = 72 N

Spring force is given as

F = k x

30 = (4) x

x = 7.5m

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Answer:

\(10\ \text{m/s}\)

Explanation:

\(s\) = Displacement = \(100\ \text{m}\)

\(t\) = Time taken = \(10\ \text{s}\)

Velocity is given by

\(v=\dfrac{s}{t}\\\Rightarrow v=\dfrac{100}{10}\\\Rightarrow v=10\ \text{m/s}\)

The person is able to run at a speed of \(10\ \text{m/s}\) in order to complete the race in the given time.

By being wary of these factors and following the recommended guidelines, you can ensure the safe and effective use of hemoconcentrators in medical procedures.

When using hemoconcentrators, it's essential to be cautious and consider a few factors to ensure their safe and effective use. Some things to be wary of with hemoconcentrators include:
1. Compatibility: Make sure the hemoconcentrator is compatible with your specific application and equipment to avoid any malfunctions or complications during the procedure.
2. Clotting risks: Hemoconcentrators can sometimes lead to increased blood clotting risks. Ensure appropriate anticoagulation measures are in place during the procedure to minimize this risk.
3. Flow rate: Be mindful of the blood flow rate through the hemoconcentrator. Exceeding the recommended flow rate could lead to hemolysis or other complications.
4. Sterility: Maintain a sterile environment and follow proper handling procedures to prevent contamination, which could potentially lead to infection.
5. Monitoring: Closely monitor the patient's vital signs, blood pressure, and fluid balance during the procedure to promptly identify and address any adverse reactions or complications.

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