What is the velocity ratio of a pulley used to raise a flag up its pole if the distance traveled by the flag is 10m and the distance traveled by the rope is 50m?

Answer: C

Explanation: You always have weight pushing down and natural force pushing up to neutralize those forces. The you add in friction and that’s how you find the answer. Plus I got it right in my quiz

This question involves the concepts of current and charge.

Current 2 has to run for "192 s" to deliver the same amount of charge as current 1.

The current is defined as the amount of charge passing per unit time. Mathematically,

[tex]I=\frac{q}{t}\\\\q = It[/tex]

Since, the charge for both the currents is same:

q₁ = q₂

I₁t₁ = I₂t₂

[tex]t_2=\frac{I_1t_1}{I_2}[/tex]

where,

I₁ = current 1 = 8.4 A

I₂ = current 2 = 10.5 A

t₁ = time for current 1 = 240 s

t₂ = time for current 2 = ?

Therefore,

[tex]t_2=\frac{(8.4\ A)(240\ s)}{10.5\ A}[/tex]

t₂ = 192 s

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Answer:

0.80 m/s

Explanation:

What is the speed of a walking person in m/s if the person travels 1000 m in 20 minutes?

Answer:

The answer of this question is :- Virtual image

Explanation:

Virtual image is the correct answer

Answer:

η = 58.8%

Explanation:

Work is defined as the force applied by the distance traveled by the body.

[tex]W =F*d[/tex]

where:

W = work [J] (units of joules)

F = force = 294 [N]

d = distance = 5 [m]

[tex]W = 294*5\\W = 1470 [J]\\[/tex]

Efficiency is defined as the energy required to perform an activity in relation to the energy actually added to perform some activity. This can be better understood by means of the following equation.

[tex]efficiency = W_{done}/W_{required}\\efficiency = 1470/2500\\efficiency = 0.588 = 58.8%[/tex]

Answer:

Field lines become straight and perpendicular because every point of circular loop the concentric circles become larger and larger as we move away from the wire.

Answer:

27.8 mph

Explanation:

May I have brainliest please? :)

Answer:

a

 [tex]v_f = 0.916 v_{ex}[/tex]

b

 [tex]v_f = 1.05 v_{ex}[/tex]

Explanation:

Considering question a

From the question we are told that

   The mass of the rocket is  [tex]m_o[/tex]  

    The mass of the fuel which is in the rocket is  m = 0.6 M  

Generally given that the rocket burns all it fuel in a single stage , the final velocity of the rocket is mathematically represented as

          [tex]v_f = v_{ex} ln [\frac{m_o}{m_k} ][/tex]

Here [tex]m_k[/tex] is the mass  of the rocket without fuel which is mathematically evaluated as

        [tex]m_k = m_o- m[/tex]

=>      [tex]m_k = m_o -0.6m_o[/tex]

=>    [tex]m_k = [1- 0.6] m_o[/tex]

=>      [tex]v_f = v_{ex} ln [\frac{m_o}{[1 - 0.6]m_o} ][/tex]    

=>      [tex]v_f = 0.916 v_{ex}[/tex]

Considering question b

From the question we are told that

   The mass of the fuel it burn at the first stage is  [tex]m = 0.3 m_o[/tex]

     The mass of the first stage fuel tank [tex]m_1 = 0.1 m_o[/tex]

    The mass of the fuel at the second stage is  [tex]m_f = 0.3m_o[/tex]

Generally the  velocity of the rocket at the first stage  is mathematically represented as

           [tex]v_i = v_{ex} * ln [ \frac{m_o }{[1- m]m_o } ][/tex]

=>         [tex]v_i = v_{ex} * ln [ \frac{m_o }{[1- 0.3]m_o } ][/tex]

=>         [tex]v_i = v_{ex} * ln [ \frac{1 }{0.7 } ][/tex]  

=>         [tex]v_i =0.357 v_{ex}[/tex]

Generally the mass of the rocket after first stage is  

    [tex]m_r = m_o - 0.3m_o -0.1m_o[/tex]

=>   [tex]m_r = 0.6m_o[/tex]

Generally the final  velocity of the rocket at the second stage is  

     [tex]v_f = v_i + v_{ex} * ln [\frac{m_r}{ m_f } ][/tex]

=>   [tex]v_f = v_i + v_{ex} * ln [\frac{0.6 m_o }{0.3mo } ][/tex]

=>   [tex]v_f = 0.357 v_{ex} + 0.693 v_{ex}[/tex]

=>   [tex]v_f = 1.05 v_{ex}[/tex]

Answer:

search up the kinetic energy and potential energy etc. then take them and look at the characteristica are they the same? What makes them similar? Why are they different ? How? Then add the chemical nuclear and electrical changes it creates. Now the rest! There you’ve got this! If you need support I’m here! Hope this helped!

Explanation:

Answer:

What is your Question.

Explanation:

Ask it Clearly.

Answer:

See the explanation below

Explanation:

The pressure is defined as the product of the density of the liquid by the gravitational acceleration by the height, and can be easily calculated by means of the following equation.

 [tex]P=Ro*g*h[/tex]

where:

Ro = density of the fluid [kg/m³]

g = gravity acceleration = 9.81 [m/s²]

h = elevation [m]

In this way we can understand that the greater pressure is achieved by means of the height of the liquid, that is, as long as the fluid has more height, greater pressure will be achieved at the bottom.

Therefore in order of decreasing will be  

The largest pressure with the largest height of the liquid, container B. The next is obtained with container D, the next with container A and the lowest pressure with container C.  

The pressure decreases as we go from the container B - D - A - C

Answer:

.78 m/s north

Explanation:

Pls give brainliest if I correct

Answer:

[tex]\boxed {\boxed {\sf d= 5 \ g/cm^3}}[/tex]

Explanation:

Density can be found by dividing the mass by the volume.

[tex]d=\frac{m}{v}[/tex]

The mass of the quartz is 30 grams and the volume is 6 cubic centimeters.

[tex]m=30 \ g \\v= 6 \ cm^3[/tex]

Substitute the values into the formula.

[tex]d=\frac{30 \ g}{6 \ cm^3}[/tex]

Divide.

[tex]d= 5 \ g/cm^3[/tex]

The density of this piece of quartz is 5 grams per cubic centimeter.

Answer:

Wavelength  = 0.48 m (Approx)

Explanation:

Given:

Speed of sound = 340 m/s

Frequency = 706 hz

Find:

Wavelength

Computation:

Wavelength  = Speed of sound / Frequency

Wavelength  = 340 / 706

Wavelength  = 0.48 m (Approx)

The answer is option c - It will divide in half to form two new cells..

Explanation:

The sentence that best describes what happened during cell growth is ;

( D ) It will become larger by taking in nutrients

As the yeast cells begin to grow ( i.e. cell growth ), they will require more nutrients and as they take in the necessary nutrients they will gradually increase in size ( becoming larger ) which is a vital sign of cell growth and development, which will be seen in the yeast cells as they undergo cell growth.

The production of offsprings with a mate does not describe an activity that occurs in cell growth.  

Hence we can conclude that The sentence that best describes what happened during cell growth is, It will become larger by taking in nutrients.

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Answer:

[tex]a=0.45\ m/s^2[/tex]

Explanation:

Given that,

The radius of a bend, r = 20 m

Velocity of motorcyclist, v = 3 m/s

The combined mass of motorcyclist and the motorcycle is 50 kg

We need to find the motorcyclist’s centripetal acceleration. The formula used to find the centripetal acceleration is given by :

[tex]a=\dfrac{v^2}{r}\\\\a=\dfrac{(3)^2}{20}\\\\a=0.45\ m/s^2[/tex]

So, the acceleration of the motorcyclist is [tex]0.45\ m/s^2[/tex].

Answer:

Potential gravitational energy is the energy that the body has due to the Earth's gravitational attraction. In this way, the potential gravitational energy depends on the position of the body in relation to a reference level.

Explanation:

Answer:

im pretty sure B

Explanation:

Answer:

B

Explanation:

They both describe a rate of motion

Answer:

The true statements are;

F, D, E, J

Explanation:

F and D are true because they agree with our knowledge of electrostatic interaction. Like charges repel while unlike charges attract. Statements B and C are not in line with the principles of electrostatics because neutral objects do not interact with charged bodies in an electric field.

E and J are true for the same reasons outlined above. Remember that like charges always repel each other and unlike charges always attract each other.

Answer:

1595790 gallons

Explanation:

Given that;

3.8 L = 1 US gallon

303,200.0 liters = 303,200.0 * 1/ 3.8 = 79789.5 gallons

If a wave is made every 90 seconds which is 1.5 mins

Then;

Number of waves made in 30 minutes = 30/1.5 = 20 waves

if each uses 79789.5 gallons, then 20 waves will use 20 * 79789.5 gallons = 1595790 gallons

Answer:

Mass, m = 32 kg

Explanation:

Given that,

Force, F = 2000 N

The change in velocity, (v-u) = 50 m/s

Time, t = 0.8 s

We need to find the mass of the ball. The net force acting on an object is given by :

F = ma

Where a is acceleration

[tex]F=\dfrac{m(v-u)}{t}\\\\m=\dfrac{Ft}{(v-u)}\\\\m=\dfrac{2000\times 0.8}{50}\\\\m=32\ kg[/tex]

So, the mass of the ball is 32 kg.

Answer:

the number of kilometers north it traveled is 53.03 km

Explanation:

The computation of the number of kilometers north it traveled is shown below:

Given that

The Displacement of 75 km

At east north of 45 degrees

Based on the above information, the number of kilometers is

= 75 × cos 45

= 53.03 km

Hence, the number of kilometers north it traveled is 53.03 km

We simply applied the above formula so that the correct value could come

And, the same is to be considered

Answer:

acceleration .......

Answer:

Explanation:

Initial velocity , u = 27 m/s

displacement before stop,  s = 41.5 m .

final velocity,  v = 0

acceleration a = ?

v² = u² + 2 a s

0 = 27² + 2 x a x 41.5

a = - 27² / 2 x 41.5

= - 8.78 m /s

Answer:

Explanation:

Frequency, in physics, the number of waves that pass a fixed point in unit time; also, the number of cycles or vibrations undergone during one unit of time by a body in periodic motion...............

Answer:

Following are the solution to this question:

Explanation:

Given value:

[tex]m_s= 4.00 \times 10^{-2} \ kg \\\\L_v=2256 \times 10^{3} \ \frac{J}{kg}\\\\m_w= 0.2 \ kg\\\\\Delta T= 50^{\circ}[/tex]

In point A:

[tex]Q_{Steam}=m_s \ L_v[/tex]

            [tex]=0.04 \times 2256 \times 10^{3}\\\\=9.02 \times 10^4 \ J[/tex]

[tex]Q_{water}= m_w \ c_w \ \Delta T\\\\[/tex]

           [tex]=0.2 \times 4190 \times 50\\\\=4.19 \times 10^4 \ J[/tex]

[tex]Q_{steam}> Q_{water}[/tex], that's why the final temperature is [tex]= 100^{\circ}[/tex]

In point B:

[tex]\to \Delta m_s L_v=m_w\ c_w \Delta T\\\\\to \Delta m_s \times 2256\times 10^3= 0.2 \times 4190 \times 50\\\\\to \Delta m_s= 1.86 \times 10^{-2} \ kg\\\\\to m_s = 2.14 \times 10^{-2} \ kg\\\\\to liquid \ left = 0.2+ 2.14 \times 10^{-2} = 2.34 \times 10^{-2} \\[/tex]

Answer:

because they are same and their properties

Answer:

D. its acceleration is zero

Explanation:

Acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.

Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate an object’s acceleration.

Mathematically, acceleration is given by the equation;

[tex]Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}[/tex]

In this scenario, a stone is thrown straight up. While the stone is rising its acceleration is zero because it's initial velocity is zero and it's until the stone reaches its highest point before the acceleration becomes constant and acting downward.