a heat engine gives out 400J of heat energy as the useful work.calculate the energy given to it as input if its efficiency is 40%?​

Answer: O:right

Explanation: In this case you place your finger on the current, and your fingers should curl showing the way, you must use your right hand in this case, otherwise that would mean the fingers on your left would bend way back, and snap off, (Not really lol,  just saying)

The direction of the magnetic field in front of the wire closest to the student is right. Thus, the correct option is B.

The direction of the magnetic field encircling a current-carrying wire can be determined using the right-hand rule. The magnetic field's direction is shown by the direction in which your fingers wrap around the wire if you point your right thumb in the direction of the current.

In this case, the student is using the right-hand rule with their thumb pointing upward. This means that the direction of the current is flowing into the page, perpendicular to the direction of their thumb.

To determine the direction of the magnetic field in front of the wire closest to the student, we can curl our fingers around the wire in the direction of the current (into the page) while keeping our thumb pointing upward. This results in the direction of the magnetic field being to the student's right.

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Answer:

all of these very easy questions

Answer:

Mass of the ball, M = 6.667 kg

Explanation:

Given data:

Momentum, Mo = 10.0 kgm/s

Velocity of the rolling ball, V = 1.5 m/s

Mass of the body, M = ?

Momentum, Mo = Mass, M x Velocity, V

10.0 kgm/s = M x 1.5 m/s

Divide each side by 1.5 m/s

M = 10.0 kgm/s / 1.5 m/s

M = (6⅔) kg

:. Mass of the ball, M = 6.667 kg

Answer:

P(ressure) = d g h = density * gravity * height

P = 13600 * 9.8 * .25 = 33,300 Pa

Check:    1 atm = 76 cm = 760 mm height = 1.01 * 10E5 Pa

h = 1.01 * 10E5 / 9.8 * 13600 .758 m = 758 mm for 1 atm

250 / 758 = 1/3 atmosphere  = 33,700 Pa   close enough for estimates

(the pressure requested is 1/3 atmosphere where 1 atm = 760 mm Hg)

Answer:

Below

Explanation:

First, we need to convert the dimension from cm to m before plugging it into the equation:

     32 / 100 = 0.32 m

     10 / 100 = 0.1 m

You can use this equation to find the pressure exerted on the ground

     Pressure = Force / Area

Plugging our values in.....

     Pressure = 16 Newtons / (0.1)(0.32)

                     = 16 Newtons / 0.032

                    = 500 N/m^2

Hope this helps! Best of luck <3

Answer:

200J

Explanation:

K.E=½mv²

K.E=½×16kg×5m/s²

K.E=8kg×25

K.E=200J

Answer:

Find a recipient that you can put the object completely inside, and fill this recipient with water. After, you put the irregular solid you want to measure the volume inside, and the water will spill out the recipient. So you take the water that spilled out and uses a graduated recipient to measure the volume of water. The volume of the solid will be exactly the same volume of water that spilled of the first recipient

Explanation:

I hope it will help you. But I am in Grade nine .And sry too cuz I told the answer of Grade nine .

Answer:

The frequency of a wave is inversely proportional to its wavelength. That means that waves with a high frequency have a short wavelength, while waves with a low frequency have a longer wavelength.

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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Explanation:

Protons electrons and neutrons

Answer:

Element Chart

Explanation:

It is a chart that provides many different elements.

Answer:

the only one I know is physics is not absent in our lives so that's false

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:

1.67m/s

Explanation:

Total Distance to be travelled by a Runner=100m

Time Taken=10*6s

Speed=Distance/Time

=100/10*6=10/6=1.67m/s

The answer you are looking for is approximately 1.67 m/s.

Solution/Explanation:

Distance Ran: 100 m.

Time ran: 10x6s, or 60s, or one minute.

Speed: Unknown?

Writing out the formula for speed, using distance and time,

S=D/T.

S=Speed.

D=Distance.

T=Time.

Substituting the given values of the variables,

S=100 m/10x6s, or S=100 m/one minute, or S=100 m/60s.

100÷60=1.6667≈1.67.

So, therefore, the final answer is approximately 1.67 m/s.

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

Answer:

The pressure inside the dropper is same as the atmospheric pressure when the rubber bulb is not pressed. ... But when we press the rubber bulb the pressure inside the dropper increases and hence the water flows out.  Atmospheric pressure acting from outside the dropper balances the pressure exerted by water and water does not come out of a dropper. On pressing the dropper inside pressure of water becomes more than outside atmospheric pressure and water run out. When we press the bulb of a dropper with its nozzle kept in water, air in the dropper is seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper.

                                             Thank You

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Answer:

v * 9.0 = 27.0 + (v * 1.2)

Answer:

cubic meter - Volume

Volt - potential difference

kelvin - temperature

ohm - electric resistance

Explanation:

hope it helps.

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Answer:

51.96 inches

Explanation:

Multiply 1.32 by 39.37

Answer:

52.0 inches

Explanation:

1.32 meters * 39.37  = 51.96 inches ~ 52.0 inches

Answer:

b

Explanation:

[tex]Hello[/tex] [tex]There![/tex]

The answer is...

A. 1 =Tt; 2 = tt; 3 = Tt; 4 = tt.

Hopefully, this helps you!!

[tex]AnimeVines[/tex]

Explanation:

Contact force includes applied force, the normal force, the tension and the frictional force. Non-contact force includes electro-magnetic force, the gravitational force and the electrostatic force. For Example, applied force is required to kick the ball else the ball would not move.

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Answer:

[tex]\boxed {\boxed {\sf 20 \textdegree C}}[/tex]

Explanation:

We are asked to find the initial temperature of aluminum. We will use the following formula.

[tex]q= mc \Delta T[/tex]

Where q is the heat energy, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature, which is also the difference between the final and initial temperature.

[tex]q= mc (T_f-T_i)[/tex]

We know the heat energy applied is 4050 Joules, the mass is 150 grams, the final temperature is 50 degrees Celsius and the specific heat is 900 Joules per kilogram degree Celsius.

We must convert the mass to kilograms because the specific heat is in kilograms. 1 kilogram contains 1000 grams.

Substitute all the known values into the formula.

[tex]4050 \ J = (0.150 \ kg )(900 \ J/kg \textdegree C)(50 \textdegree C -T_i)[/tex]

We are solving for the initial temperature, so we must isolate the variable [tex]T_i[/tex]It is being multiplied by 0.150 kilograms and 900 Joules per kilogram degree Celsius. The inverse operation of multiplication is division, so we divide by both values.

[tex]\frac {4050 \ J}{ (0.150 \ kg )(900 \ J/kg \textdegree C)}= \frac{(0.150 \ kg )(900 \ J/kg \textdegree C)(50 \textdegree C -T_i)}{(0.150 \ kg )(900 \ J/kg \textdegree C)}[/tex]

[tex]\frac {4050 \ J}{ (0.150 \ kg )(900 \ J/kg \textdegree C)}=(50 \textdegree C -T_i)}[/tex]

The units of Joules and kilograms cancel.

[tex]\frac {4050 }{ (0.150 )(900 \ \textdegree C)}=(50 \textdegree C -T_i)}[/tex]

[tex]\frac {4050}{135} \textdegree C = (50 \textdegree C -T_i)[/tex]

[tex]30 \textdegree C = (50 \textdegree C -T_i)[/tex]

50 degrees Celsius is being added to [tex]-T_i[/tex]. The inverse operation of addition is subtraction. Subtract 50 degrees Celsius from both sides.

[tex]30 \textdegree C - 50 \textdegree C= 50 \textdegree C - 50 \textdegree C - T_i[/tex]

[tex]-20 \textdegree C = -Ti[/tex]

[tex]T_i[/tex] is being multiplied by -1. The inverse operation of multiplication is division. Divide both sides by -1.

[tex]\frac {-20 \textdegree C}{-1}= \frac{-T_i}{-1}[/tex]

[tex]20 \textdegree C = T_i[/tex]

The initial temperature of the aluminum was 20 degrees Celsius.

Answer:

White light entering a prism is bent, or refracted, and the light separates into its constituent wavelengths. Each wavelength of light has a different colour and bends at a different angle. The colours of white light always emerge through a prism in the same order—red, orange, yellow, green, blue, indigo, and violet.

Answer:

The touch in a circuit is by forming a circuit with the bars, and moving the horseshoe magnet backwards and forwards upon it. Between the two poles a strong current is excited, & on moving the magnet around we magnetize the bars to saturation i.e. to as a high degree as the bar is capable of retaining.

Explanation:

Please give me brainliest! Hope I helped! :)

Answer:

The answer is [tex]v=4ms^{-1}[/tex]

Explanation:

Given,

[tex]u=0\,ms^{-1}\\a=8\,ms^{-2}\\s=1\,m\\\\v=?[/tex]

We know,

∴[tex]v^{2}=u^{2} +2as\\=>v^{2} =0^{2} +2*8*1\\=>v^{2}=16\\v=4\,ms^{-1}[/tex]

Hope you have understood this....

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Answer:

90 km/hr= 90000/3600=25 m/s initial velocity

-25/ 2 (-4.9)= 2.551 secs

h(2.551)= -4.9 (2.551)² + 25(2.551)=-31.8872449+63.775 = 31.8m

The distance would be 31.8 meters, also that person will have sore arm.

Answer:

54km/hr

Explanation:

Since we have to complete m/s to km/h.

we can simply divide the m/s by (5/18)

so we get 54km/hr