e) A escalator carries 60 people of average mass 70kg to a height of 5m in one minute. Find the power needed to do this? 4​

Answer:

500N

Explanation:

Basically the weight of water displaced is the amount of upthrust. The upthrust is equal to the weight of the water moved by the submerged part of the body and therefore is equal to 500N.

Hope this helps!

Answer:

the answer is

Explanation:

constant acceleration

because when the object's velocity is changing then the object is accelerating or decelerating

as acceleration describe changing of velocity so the answer is constant acceleration

Acceleration is defined as the rate of change of velocity.

Acceleration = (Change in velocity) / time taken

Acceleration = (Final velocity - initial velocity) / time

As the object velocity changes by the same amount in each second, it means the acceleration is constant.

Hope I can help u

Answer:

The larger the number of charges flowing through the wire,the larger is the current flowing in the wire.

Explanation:

if the wire is large then large amount of current flows through the circuit.but if the wire is small then a smaller amount of current will pass through.

I hope this helps

Answer:Benedict’s Test

Explanation:

The student will use Benedict's test to support her argument.

The common reagents for testing carbohydrates are iodine and Benedicts test.

While iodine gives a positive result with starch, it doesn't react with fructose.

Benedict's reagent is used to determine the presence of reducing sugar in a given solution.

A positive test with Benedict's reagent is determined by a color change from clear blue to brick-red with a precipitate.

A reaction between fructose and Benedict's solution gives a positive test from the color change which occurs when the fructose is reduced to simple sugar such as glucose and mannose.

Thus, the student will use Benedict's test to support her argument.

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Explanation:

1.The parts of the ear include:

External or outer ear, consisting of: Pinna or auricle. This is the outside part of the ear. ...

2.Tympanic membrane (eardrum). The tympanic membrane divides the external ear from the middle ear.

3.Middle ear (tympanic cavity) , consisting of: Ossicles. ...

4.Inner ear , consisting of: Cochlea.

Explanation:

The major parts of ear are:-

1) Outer ear

2) Middle ear

3) Inner ear

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Answer:

What boxes are you talking abt?

1. Current means flow of electrons and electrons are negative charged and so are attracted to the positive end of the battery and repelled by the negative end.

2. When battery is connected in a circuit that lets the electron flow through it, they flow from negative to positive.

3. When negative terminal of cell is connected to other negative terminal of the cell in a particular circuit then, current will not flow in circuit as electrons cannot flow from negative to negative terminal.

Explanation:

a).  The gravitational forces between the Earth and the Sun bends the Earth's motion along a curving path instead of a straight line.

b).  The gravitational forces between the Earth and a falling rock make the rock fall faster and faster.

c).  The force of a pressurized stream of hot air makes a balloon get rounder and bigger.

d).  The gravitational forces between the Earth and a rock tossed straight up make the rock go slower and slower, and eventually stop.  (In the next instant,  it starts falling, as described in answer-b.))

e).  The acoustic and emotional force of your mother's voice 15 minutes before the school-bus arrives causes you to turn over, sit up, and start putting on your socks.

Answer:

D) Both parts are true.

Hey there, hope my answer helps :)

Answer: D) Any object that has motion has kinetic energy, while any object not in motion but with the potential to do work has potential energy.

Answer:

i hope it helped U

stay safe stay happy

Answer:

2.6 seconds

Explanation:

You have to divide the distance by the velocity to find the time:

46/18 = 2.55 ≈ 2.6 seconds

The answer you are looking for is approximately 2.6 seconds.

Solution/Explanation:

To get the correct answer, you must divide the distance and velocity.

This means that 46÷18=2.5556.

2.5556≈2.6.

So, therefore, the final answer is approximately 2.6 seconds.

I hope that this has helped you. Enjoy your day, and take care.

Answer:

Wanna be my friend?

Explanation:

The final volume is 4.0 liters.

We can calculate the final volume with Boyle's law:

[tex] P_{i}V_{i} = P_{f}V_{f} [/tex]  (1)

Where:

[tex] P_{i}[/tex]: is the initial pressure = 100 kPa

[tex] V_{i}[/tex]: is the initial volume = 1.0 L

[tex]P_{f}[/tex]: is the final pressure = 25 kPa

[tex]V_{f}[/tex]: is the final volume =?

Hence, the final volume is:

[tex] V_{f} = \frac{P_{i}V_{i}}{P_{f}} = \frac{100 kPa*1.0 L}{25 kPa} = 4.0 L [/tex]

Therefore, the final volume is 4.0 liters.

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The time that takes for the train that is traveling with an initial velocity of 20.1 m/s to stop is 402 seconds.    

The time that will take for the train to stop can be calculated with the following kinematic equation:

[tex] v_{f} = v_{i} + at [/tex]   (1)

Where:

[tex] v_{f}[/tex]: is the final velocity = 0 (when it stops)

[tex] v_{i}[/tex]: is the intial velocity = 20.1 m/s

a: is the acceleration = -0.0500 m/s²

t: is the time =?

By solving equation (1) for t, we have:

[tex] t = \frac{v_{f} - v_{i}}{a} = \frac{0 - 20.1 m/s}{-0.0500 m/s^{2}} = 402 s [/tex]

Therefore, it will take 402 seconds for the train to stop.  

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Answer:

Below

Explanation:

In my experience, vf means final velocity, and v would be the average velocity!

You would write it as ΔV (delta V)

The SI units that are used to measure it are m/s

Hope that helped!

v and vf stand for velocity and final velocity respectively. its SI unit is to measure it is m/s.

Velocity is "rate in change of displacement with respect to time".

i.e. v= dx/dt. It is denoted by v.

it is also defined as displacement divided time. i.e. v= Displacement÷Time.

Velocity shows how much distance can be covered in unit time. It's SI unit m/s.

Acceleration is rate in change of velocity with respect to time.

i.e. a = dv/dt

if an object changes its velocity in short time, we can say that it has greater acceleration.

a= dv/dt =Δv/Δt =  [tex]\frac{v_{i} - v_{f} }{t_{i}-t_{f} }[/tex]

where    [tex]v_{i}[/tex]= initial velocity of an object

             [tex]v_{f}[/tex]= final velocity of an object

             t₂= initial time of an object

             t₁ = final time of an object

Hence v is stands for velocity and vf is stand for final velocity,

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Answer:four covalent bonds

Explanation:

It’s right

Answer:

Amperes

Explanation:

It is named after a French physicist  André-Marie Ampère.

HOPE THIS HELPED

The unit of electric current is Ampere, and it is named after the French physicist André-Marie Ampère (1775 - 1836).

Answer: Approximately 22 cm

=========================================================

Explanation:

The unstretched spring is 12.0 cm long. When adding a load of 5.0 N, it stretches to 15.0 cm. This is a displacement of 15.0 - 12.0 = 3.0 cm, which is the amount the spring is stretched.

Convert this displacement to meters (so that it fits with the meters unit buried in Newtons).

3.0 cm = (3.0)/100 = 0.03 m

Apply Hooke's Law to find the spring constant k

F = -kx

5.0 = -k*(0.03)

k = -(5.0)/(0.03)

k = -166.667 approximately

Now we must find the displacement x when F = 15 newtons

F = -kx

-kx = F

x = F/(-k)

x = -F/k

x = -15/(-166.667)

x = 0.089 approximately

x = 0.1

The displacement to one decimal place is about 0.1 meters, which converts to 100*0.1 = 10 cm

So the spring will be stretched to about 12cm+10cm = 22 cm

Answer:

Diffraction and Wavelengyh

Answer:

The best method to test this with is the buoyancy technique. The buoyancy technique puts force on an object that is equal to the weight of the fluid replaced by the object.

Hope this helps :D

Answer:

700 hz

Explanation:

Answer:

Yes

Explanation: Thats exactly how it goes

Answer:

The ratio of the force produced by a machine to the force applied to it, used in assessing the performance of a machine is called mechanical advantage.

Answer:

300,000=3×10^3

.000012=1.2×10^-6

Answer:

45/30

Explanation:

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Nikki has a momentum of 45 Kilogram meters per second and a mass of 30 Kilograms. then her velocity would be 1.5 meters per second

It can be defined as the product of the mass and the speed of the particle, it represents the combined effect of mass and the speed of any particle, and the momentum of any particle is expressed in Kg m/s unit.

Mathematically the formula of the momentum is

P = mv

where P is the momentum of the particle

m is the mass of the particle

v is the velocity by which the particle is moving

As given in the problem Nikki has a momentum of 45 Kilogram meters per second and a mass of 30 Kilograms

P = 45 Kilogram meters per second

m = 30 Kilograms

By substituting the values of the momentum and the mass in the formula of the momentum

P = mv

45 = 30 ×v

v = 45/30 meters per seconds

v = 1.5 meters per seconds

Thus, Nikki weighs 30 kilograms and moves at a 45 kilogram per the second momentum. subsequently, her velocity would be 1.5 meters per second.

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Answer:

Step 1. Make observations.

Step 2. Form a hypothesis.

Step 3. Make a prediction.

Step 4. Perform an experiment.

Step 5. Analyze the results of the experiment.

Step 6. Draw a conclusion.

Step 7. Report your results.

Explanation:

The first step in the Scientific Method is to make objective observations. These observations are based on specific events that have already happened and can be verified by others as true or false. Step 2. Form a hypothesis.

Our observations tell us about the past or the present. As scientists, we want to be able to predict future events. We must therefore use our ability to reason.

Scientists use their knowledge of past events to develop a general principle or explanation to help predict future events. The general principle is called a hypothesis. The type of reasoning involved is called inductive reasoning (deriving a generalization from specific details).

A hypothesis should have the following characteristics:

• It should be a general principle that holds across space and time

• It should be a tentative idea

• It should agree with available observations

• It should be kept as simple as possible.

• It should be testable and potentially falsifiable. In other words, there should be a

way to show the hypothesis is false; a way to disprove the hypothesis.

Some mammals have two hind limbs would be a useless hypothesis. There is no observation that would not fit this hypothesis!

All mammals have two hind limbs is a good hypothesis. We would look throughout the world at mammals. When we find whales, which have no hind limbs, we would have shown our hypothesis to be false; we have falsified the hypothesis.

When a hypothesis involves a cause-and-effect relationship, we state our hypothesis to indicate there is no effect. A hypothesis, which asserts no effect, is called a null hypothesis. For instance, the drug Celebra does not help relieve rheumatoid arthritis.