a horizontal 52-N force is needed to slide a 50 kg box across a flat surface at a constant velocity of 3.5 m/s. What is the coefficient of kinetic friction between the box and the floor?

Let's take into account the volt-volt potential difference between the plates and a capacitance capacitor.

C farad, we can raise the fee

q1 to q1+dq1

between the positive and negative plates.

the instantaneous potential difference will be

V1 = q1C

The finished work will be d

W = V1dq1

The capacitor's total charging effort from the uncharged state to the finished state q will now be

W =∫q0q1Cdq1

=1C[q122]

q0=1C[q22−0]

=12q2C

We are aware that the entire quantity of work done is defined by potential energy.

The potential energy will be

U=W=12q2C

As a result, the capacitor's energy is

U=12q2C.

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The work done by polytropic process is -69.88 kJ.

The work for the polytropic process is determined using  

P . v^n = constant.

where P is pressure, V is specific volume

As we know that

W = m∫Pdv

W = m(P2v2 - P1v1) / (1 - n)

In order to evaluate this expression, we need to determine the specific volumes and the polytropic exponent, n.

State 1: v1 = vg1 = 0.0993 m3/kg

State 2: at 12 bar, 80oC; v2 = 0.02051 m3/kg

Hence by using polytropic exponent

P1 / P2 = (v2 / v1)^n

n = ln(2/12) / ln(0.02051/0.0993)

n = 1.136

Find the work done

W = m(P2v2 - P1v1) / (1 - n)

W = 2kg(12bar . 0.02051m³/kg - 2 . 0.0993) / (1 - 1.136) x (10⁵ N/m²/1 bar) x (1 kJ / 10³ Nm)

W = -69.88 kJ

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Answer:

4 LE DIOXYDE  DE CARBONE

Explanation:

Answer:

120 m

Explanation:

4 m/s  * 30 s  = 120 m

Change in the starting time of the robots for the race will allow the slower robot to win the race.

Robots are any autonomously run machines that eliminate the need for human labour, even if they may not look like humans or carry out tasks in a way that is humanlike. Robotics, then, is the branch of engineering that deals with the creation, maintenance, and use of robots.

Although the idea of synthetic people predates written history, the term "robot" is derived from the Czech word "robota," which means "forced labour" or "serf," and was used in Karel apek's play R.U.R. (1920).

Runaround, a work of science fiction by Isaac Asimov, introduced the word robotics (1942). It established a new level of plausibility regarding the possible difficulty of creating sentient robots and the potential technological and societal issues that might arise, along with Asimov's other robot stories.

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Answer:

[tex]\boldsymbol {\boxed{v = 12 \ \dfrac{\text{ km}}{\text{hr}} }}[/tex]

Explanation:

Data:

t = 2 hr

S = 12 km

Find:

[tex]v \ - \ ?[/tex]

-----------------------------------

Solution:

[tex]\boldsymbol {\boxed{v = \dfrac{S}{t} }}[/tex]

Calculations:

[tex]\boldsymbol v =[/tex] 12 km / 2 hr = 6 km/hr.

Answer: [tex]v =[/tex] 6 km/hr.

The probability is 0.006

                          [tex]\begin{aligned}\\\\P &= 0.6\times0.6\times0.6\times0.6\times0.6\times 0.6\times0.6\times0.6\times0.6\times0.6\\\\&= 0.0060466\\\\&\approx0.006\end{aligned}[/tex]

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The speed of the ball just before it strikes the ground is 46.4 m/s

Motion under gravity is also known as vertical motion. The gravity act only on the vertical component of the velocity.

Given that a ball is thrown horizontally from the top of a building 110 m high. The ball strikes the ground 74 m horizontally from the point of release.

The time taken for the ball will be

h = ut + 1/2gt²

but u = 0

110 = 1/2 × 9.8 × t²

110 = 4.9t²

t² = 110 / 4.9

t² = 22.45

t = √22.45

t = 4.74 s

The speed of the ball just before it strikes the ground will be

v² = u² + 2gH

v² = 0 + 2 × 9.8 × 110

v² = 2156

v = √2156

v = 46.4 m/s

Therefore, the speed of the ball just before it strikes the ground is 46.4 m/s

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If we apply same force  to both-an apple or a couch, the object which will accelerate less is couch.

What is acceleration?

Acceleration is the term used to describe the pace at which speed and direction of velocity vary over time. Something is said to be accelerating when it starts to move faster or slower. Even when the speed is constant, motion on a circle accelerates because the direction is always keeps shifting. Both impacts cause all other motions to speed up.

The couch will accelerate less because

F = m a

where, F = force, m = mass, a = acceleration.

This equation can also be written as

a = F/m

It tells us that the acceleration is inversely proportional to mass.

so, in the question given the mass of couch will greater as compared to an apple so the acceleration of the couch will be lesser as compared to apple.

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A pebble off a cliff to hit the ground below t = 0.128 sec.

Given,

distance = 18m

velocity = 2.3m /s

time = ?

To find the time in given data,

Use formula,

velocity = distance / time

Putting the value in formula,

We get,

2.3 m/s = 18 m / t

t = 2.3 m/s / 18 m

t = 0.128 sec

The vector quantity velocity (v), denoted by the equation v = s/t, measures displacement (or change in position, s), over change in time (t). Speed (or rate, r) is a scalar quantity, denoted by the equation r = d/t, that measures the distance traveled (d) over the change in time (t).

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Answer:

It is not possible to change direction twice, given constant acceleration. To convince yourself, imagine any general v−t graph - it would be straight line in case of constant acceleration. Change in direction corresponds to v going from positive to negative or vice versa.Explanation:

Answer:It is not possible to change direction twice, given constant acceleration. 

Explanation:To convince yourself, imagine any general v−t graph - it would be straight line in case of constant acceleration. Change in direction corresponds to v going from positive to negative or vice versa.

The circuit directory shows the load/area in a vocabulary that would be clear for "nonelectrical" people to decipher and determine the circuit number for luminaires, receptacles, appliances, or tools.

True stress is the spread load divided by the actual cross-sectional scope of material. Engineering strain is the applied load separated by the original cross-sectional area of material. Also known as nominal stress.

As expected by the units, stress is assigned by dividing the force by the location of its generation, and since this area (“A”) is either sectional or axial, the basic stress formula is “σ = F/A”.

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The car travels a distance of 820m in the first 34s after the light changes to green.

Acceleration, a = 2ms⁻²

Initial velocity, u = 0 ms⁻¹ (Since the car start from rest)

Final velocity, v = 20 ms⁻¹

From first equation of motion,

v - u = at

20 - 0 = 2 × t

20 = 2t

t = 10s

From second equation of motion,

S = ut + ¹/₂ at²

Distance travelled during 10s:

S₁ = 0 × 10 + ¹/₂ × (10)²

S₁ = 100m

Distance travelled for the remaining 36s:

S₂ = v × t

S₂ = 20 × 36

S₂ = 720m

Total distance travelled:

S = S₁ + S₂

S = 100 + 720

S = 820m

Therefore, the car travels a distance of 820m in the first 34s after the light changes to green.

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For a 0.7500 cm diameter plastic sphere, used in a static electricity demonstration, the potential near its surface is 144V.

V= kq/r = 9 x [tex]10^{9}[/tex] [tex]\frac{6*10^{-11}}{0.00375}[/tex]

=144 V

The magnitude of the potential point per unit charge is the electric potential at a specific point. However, the following definition is far more accurate: The amount of work required to move a unit positive charge from infinity to a certain place is known as the electric potential at that location.

Potential is characterized as a thing’s potential to materialize. The greatest grades to which a specific student is capable are an illustration of potential.

The external effort required to move a charge in an electric field from one position to another is known as an electric potential difference, or voltage.

The difference in potential energy experienced by an object is known as its electric potential.

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The magnitude of the resulting forces applied to the nails if they are located at A and B is 64.44 N, at B and C is 120.83 N and at A and C is 56.86 N.

We know that,

C = F d

where,

C = Couple

F = Magnitude of resulting forces

d = Distance between two points

Given that,

C = 29 N m

[tex]d_{AB}[/tex] = 450 mm = 0.45 m

[tex]d_{BC}[/tex] = 240 mm = 0.24 m

F = C / d

The magnitude of the resulting forces applied to the nails if they are located at A and B is

F = 29 / [tex]d_{AB}[/tex] = 29 / 0.45

F = 64.44 N

The magnitude of the resulting forces applied to the nails if they are located at B and C is

F = 29 / [tex]d_{BC}[/tex]  = 29 / 0.24

F = 120.83 N

The magnitude of the resulting forces applied to the nails if they are located at A and C is

F = 29 / [tex]d_{AC}[/tex]  

[tex]d_{BC}[/tex]  = √ ( [tex]d_{AB}[/tex] )² + ( [tex]d_{BC}[/tex] )²

[tex]d_{BC}[/tex]  = √ ( 0.45² + 0.24² )

[tex]d_{BC}[/tex]  = 0.51 m

F = 29 / 0.51

F = 56.86 N

A Couple is two parallel forces of equal magnitude acting in opposite direction.

Therefore, the magnitude of the resulting forces applied to the nails if they are located at

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Atoms of the pair P and Cl will form covalent bonds in the compound. The correct option is (D)

Covalent bonds are formed between two non-metals. Of the given options the only option that has two non metals is P ( Phosphorous ) and Cl ( Chlorine ). Therefore they will form a covalent bond in a compound.

Chlorine is a halogen. It belongs to group 17 of the periodic table. Phosphorous is a p-block element which belongs to group 15. Group 15 is also called as nitrogen family.

Therefore, the atoms of the pair P and Cl will form covalent bonds in the compound. The correct option is (D)

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The electric force or the tension in the string holding the charges together is most nearly to: 1.94 newtons

To solve this exercise the electric force formula and the procedure we will use is:

F = (k * q1 * q2)/r²

Where:

Information about the problem:

By converting the the values of the charges (q1) and (q2) from (μC) to (C) we have that:

q1= 2.4 μc * 1×10−6C/ 1 μC

q1= 2.4*10^ -6 C

q2= 3.6 μc * 1×10−6C/ 1 μC

q2= 3.6*10^ -6 C

By converting the the separation distance of the charges from (cm) to (m) we have:

r = 20 cm * 1 m/100 cm

r= 0.20 m

Applying the electric force formula we have:

F = (k * q1 * q2)/r²

F = [(9 *10^9 N*m²/C² * (2.4*10^ -6 C) * (3.6*10^ -6 C)]/ (0.20 m)²

F = 0.07776 N*m² /0.04 m²

F = 1.94 N

In physics the electric force is the force that attracts or repels two charges (q) separated at a distance called (r), this is expressed in the international system of units in Newton.

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Answer:

the answer to this question is false because a airplane wouldve survive in space

The true statement about the equation of respiration is:

The mass of the reactants is the same as the mass of the products; option C.

Respiration is the process by which living organisms break down large molecules such as glucose into smaller molecules such a carbon dioxide and water to release energy in the form of ATP.

Respiration are of two types in living organisms:

The equation of aerobic respiration is given below:

In the given equation above, glucose reacts i the presence of oxygen is broken down into carbon dioxide and water and energy is released.

According to the law of conservation of mass, the mass of reactants is equal to the mass of the products.

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Note that the complete question is given below:

Respiration describes the process that living cells use to release energy by combining sugar and oxygen. The primary chemical changes that happen during respiration are shown in the equation below.

C₆H₁₂O₆ + 6 O₂ → 6 CO₂ + 6 H₂O + energy

Which statement correctly compares the reactants and products of the equation?

Which statement correctly compares the reactants and products of the equation?

A.

The mass of the reactants is less than the mass of the products.

B.

The mass of the reactants is greater than the mass of the products.

C.

The mass of the reactants is the same as the mass of the products.

D.

The number of reactant molecules is greater than the number of products.

Answer:in this situation we have during the two tiny spheres of masks, 5.8 mg carry Charges of equal magnitude 30 77 Nano column but opposite in sign They are tied to the same ceiling hook by light in spring of 2.53 m. It is known that when they original uniform electric village applied that is directed to the left. The angle between the springs is 58°. Then we have to find the value of E. So given that the mass M is 5.8 mg, that is 5.8 into 10 to the power -3 g. And This is five and we have the charge that is Q. Is 77 and a column. So this is 77 into 10 to the power -9 columns. The length of the string is 0.53 m. And the angle between the spring.

The First Law of Motion of Newton states that an item at rest or in motion will tend to stay at rest or in motion until acted upon by an external force. This means that anybody not wearing a seatbelt will continue to move forward in the initial direction of motion.

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Answer:

Banana/Carbohydrate Amount - 27 g

Explanation:

Egg/Carbohydrate Amount - 0.6 g

Banana/Carbohydrate Amount - 27 g

Steak/Carbohydrate Amount - 0 g

Butter/Carbohydrate Amount- 0 g

Mass of the particle m=1.48 g=1.48×10−3 kgm=1.48 g=1.48×10−3 kg

Electric field E=670 N/CE=670 N/C directed downwards.

The electric force must act as opposite to the weight of the particle

we know,

qE= mg x qE = mg

q = mgEq= mgE

q= 1.48×10−3  kg × 9.8 m/s 2670 N/C

therefore; q=2.16×10−5 Cq= 2.16×10−5 C

As the force is upwards and an electric field is downwards it means the charge on the particle is negative.

q=−2.16 × 10−5 Cq= −2.16 × 10−5 C

In the second case for a proton

qE= mgqE= mg

E= mgqE= mgq

E= 1.67×10−27 kg × 9.8 m/s21.6×10−19 C

E= 1.023×10−7 N/C

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By using uniform motion, the high up the slope will it strike is 730.62 m.

We need to know about uniform motion to solve this problem. The uniform motion is an object's motion under acceleration. It should follow the rule

vt = vo + a . t

vt² = vo² + 2a . s

s = vo . t + 1/2 . a . t²

where vt is final velocity, vo is initial velocity, a is acceleration, t is time and s is displacement.

From the question above, we know that

θ = 70⁰

vi = 200 m/s

x = 300 m

Find the initial velocity in x and y axis

vx = vi cosθ = 68.40 m/s

vy = vi sinθ = 187.94 m/s

Find the time taken to reach 300 m

vx = x / t

68.4 = 300 / t

t = 4.39 second

Find the time taken to reach maximum height

vt = vo + a . t

0 = vy - g . t

vy = gt

187.94 = 9.8 . t

t = 19.18 second

The motion of projectile is raising to maximum height, hence

s = vo . t + 1/2 . a . t²

h = vy . t - 1/2 . g . t²

h = 187.94 . 4.39 - 1/2 . 9.8 . 4.39²

h = 730.62 m

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Answer:

Charging a phone is the exact opposite of discharging a battery's energy. By supplying current (the manipulated variable), a charger transfers lithium ions from the positive electrode to the negative electrode, thus restoring energy

Explanation:

Answer:

146.4 s

Explanation:

Distance / rate = time

205 m / 1.4 m/s =  146.4 s

The current, voltages, resistances of the circuits in problem 1, 2, and 3 are given by Ohm's law as follows;

Questions 1—3 In Problems

Ohm's law states that the current, I in a circuit or between two points in a circuit is proportional to the voltage, V, across the circuit or the part of the circuit.

Mathematically, V = I × R

Where;

R = The circuit resistance to current

1. The current in the hair dryer draws from the circuit = 10–A

The voltage of the circuit to which the hair dryer is connected = 120–V

From Ohm's law, we have;

V = I•R

R = V/I

I = 10 A

V = 120 V

Therefore;

R = 120 V/(10 A) = 12 Ohms

2. The battery resistance = 2 Ohms

The voltage of the battery = 1.5–V

The current in the circuit is therefore found as follows;

R = 2 Ohm

V = 1.5 V

The current, I = V/R

Therefore;

I = (1.5 V)/(2 Ohms) = 0.75 A

3. The current supplies by the battery, I = 0.25 A

The battery resistance, R = 48 Ohm

The voltage of the battery, V = I × R

Therefore;

V = 0.25 A × 48 Ohm = 12 V

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