photovoltaic cells . select one: a. are increasingly costly produce which precludes major commercial application b. rely on the electrical current produced when silicon is struck by sunlight c. require an outside source of electricity to generate electricity on their own d. have small rotational generators built into every cell

Answer:

1. If the knot is in equilibrium - no net force acts on the knot.

2. F1x = 0                 F1y = -F1

   F2x = -F2 cos θ1        F2y = F2 sin θ1

    F3x = F3 cos θ2        F3 = sin θ2

3.    Fx net = 0        

       Fy net = 0          for equilibrium to occur

4. F2 cos θ1 = F3 cos θ2

   F1 = M g = 2.1 * 9.8 = 20.6 N

    F2 sin 30 + F3 sin 60 = 20.6      balancing forces in y-direction

or   .5 F2 + .866 F3 = 20.6       (use this equation below )   (I)

    F2 cos 30 = F3 cos 60       as stated above

    .866 F2 = .5 F3        or F3 = 1.732 F2        substituting for θ

    .5 F2 + .866 (1.732 F2) = 20.6       using (I) above

   2.0 F2 = 20.6       and

     F2 = 10.3 N

    F3 = 1.732 * 10.3 = 17.8 N

Check:

    10.3 * .866 = .5 * 17.8        using values above

     8.92 = 8.9       forces balance

Also    .5 * 10.3 + .866 (1.732 * 10.3) = 20.6

Any flip-flop is capable of changing its sensitivity by being edge-triggered.

A circuit is the name for this circular path that must constantly exist for electricity to circulate and perform important tasks. We are creating a circuit, which is a route that begins and ends at the same location.

A circuit in electronics is a full circular channel via which electricity flows. A current source, conductors, and just a load make up a straightforward circuit. In a broad sense, a word "circuit" can refer to every permanent path through which electricity, information, or a communication can pass.

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Answer:

For a fixed mass of an ideal gas kept at a fixed temperature, pressure and volume are inversely proportional. Or Boyle's law is a gas law, stating that the pressure and volume of a gas have an inverse relationship. If volume increases, then pressure decreases and vice versa, when the temperature is held constant.

When Car A moving at 30 m/s to the north and Car B moving at 15 m/s to the south collide Car A applies a greater force on car B than car B applies on car A.

p = m v

p = Momentum

m = Mass

v = Velocity

For car A,

m = 1000 kg

v = 30 m / s

p = 1000 * 30

p = 30000 kg m / s

For car B,

m = 1000 kg

v = 15 m / s

p = 1000 * 15

p = 15000 kg m / s

F = dp / dt

Force can also said as the rate of change of momentum. Since the momentum of car A is higher than that of car B, the force applied by car A on car B will he higher

Therefore, car A applies a greater force on car B than car B applies on car A.

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Answer:

When several resistors are connected in series, the total resistance equals the sum of the individual resistors. In series combination, the current is same through each resistor.

1)   V=  60 volt

Total resistance R = R₁ + R₂

                              = 20 + 10

                              = 30 Ω

2) Ohms law states that,

           \(\sf I =\dfrac{V}{R}\\\\\\I = \dfrac{60}{30}\\\\I = 2 \ A\)

3) Voltage around 10 Ω resistor,

          V₂ = I R₂

             = 2 * 10

              = 20 volt

___________________________________________________

4) Total current = 1 A

5) Total voltage = 8 volt

6) Voltage around R₁ is V₁

              R₁ = 2 Ω  ; I = 1 A

              V₁ = IR₁

                   = 1 * 2

                   = 2 volt

7) Resistance 2:

        Total resistance = R

        Total voltage = V = 8 volt

        Total current = I = 1 A

                  \(\sf R = \dfrac{V}{I}\\\\\\ R = \dfrac{8}{1}\\\\\)

                  R = 8 Ω

               R₁ + R₂ = 8 Ω

                2 + R₂ = 8

                      R₂  = 8 - 2

                      R₂ = 6 Ω

8)Voltage around R₂:

                  \(\sf V_2 = IR_2\\\\V_2 = 1*6\\\\\)

                  V₂ = 6 volt

9) Total R = 8 Ω

_________________________________________________

10) Total V = 12 volt

11)  Total R = 8 + 8

                 = 16 Ω

12) Total current I,

                \(\sf I = \dfrac{V}{R}\\\\I = \dfrac{12}{16}\\\\I = 0.75 \ A\)

13) Voltage at each resistor:

           V₁ = I*R₁

               = 0.75 * 8

               = 6 volt

         V₂ = I*R₂

              = 0.75 * 8

             = 6 volt

_______________________________________________________

     14) Total R =   40 + 20

                       = 60 Ω  

15) To find V₁, first find total voltage.

           I = 2 A ;  R = 60 Ω  

           V = IR    

              = 2 * 60

               = 120 V

        V₁ + V₂  =V

        V₁ + 80 = 120

                V₁ = 120 - 80

                 V₁ = 40 volt              

Power = work / time

Power = 200J / 10 seconds

Power = 20 watts

the statement from Dalton's atomic theory that is no longer true is "Atoms are indivisible and cannot be divided into smaller particles."

Dalton's atomic theory, proposed in the early 19th century, stated that atoms were indivisible and indestructible particles, meaning they could not be further divided into smaller particles. However, with advancements in scientific understanding and the development of subatomic particle physics, it has been discovered that atoms are not indivisible. Atoms are composed of subatomic particles, namely protons, neutrons, and electrons. Protons and neutrons reside in the nucleus at the center of the atom, while electrons orbit around the nucleus. Furthermore, scientists have identified even smaller particles within the nucleus, such as quarks and gluons. Hence, the concept of atoms being indivisible, as proposed in Dalton's atomic theory, is no longer valid based on modern atomic theory.

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Which of the following statements from Dalton's atomic theory is no longer true, according to modern atomic theory?

A) All atoms of a given element are identical.

B) Atoms are not created or destroyed in chemical reactions.

C) Elements are made up of tiny particles called atoms.

D) Atoms are indivisible and cannot be divided into smaller particles.

Answer:

x = 5.7876

Explanation:

You can use tan Θ to solve this.

Given that,

Tan Θ = 24°

Opposite = x

Adjacent  = 13

Let us solve now.

Tan Θ = Opposite  ÷ Adjacent

Tan 24°  = x ÷ 13

0.4452 = x ÷ 13

0.4452 × 13 = x

5.7876 = x

Therefore,

x = 5.7876

Electrons move from the wool to the rod.

BEcause if they move from wool to rod, the rod has more number of electrons now. Hence making it negatively charged

The plastic rod becomes charged when electrons move from the wool to the rod to become negatively charged. Details about charge can be found below.

Electronegativity is the tendency, or a measure of the ability, of an atom or molecule to attract electrons and thus form bonds.

According to this question, a plastic rod becomes negatively charged when it is rubbed with a piece of wool.

An atom becomes negatively charged when it gains electrons from another atom, hence, it can be said that the plastic rod becomes charged when electrons move from the wool to the rod to become negatively charged.

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The maximum horizontal force that can be applied to the lower block without the upper block slipping is 1.05 kg \(m/s^2\).

The maximum horizontal force that can be applied to the lower block without the upper block slipping can be found by considering the forces acting on the system. The weight of the upper block exerts a downward force on the lower block, which is counteracted by the normal force between the two blocks. The force of static friction acts to prevent the upper block from slipping.

Since the coefficient of static friction is given as 0.35, we can use this to calculate the maximum horizontal force that can be applied to the lower block. The force of static friction is equal to the coefficient of friction times the normal force between the two blocks.

We know that the weight of each block is 3.0 kg, so the total weight of the system is 6.0 kg. Therefore, the normal force between the two blocks is equal to the weight of the upper block, which is 3.0 kg.

The maximum force that can be applied to the lower block is therefore given by:

Maximum force = coefficient of friction x normal force
Maximum force = 0.35 x 3.0 kg
Maximum force = 1.05 kg \(m/s^2\)

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By examining the influence of surface area and material composition on thermal energy transfer in a controlled experiment, we can gain valuable insights into the fundamental factors that affect heat exchange. This knowledge can have practical applications in fields such as engineering, materials science, and energy efficiency.

A good question about the variables that affect thermal energy transfer in a controlled experiment could be: How does the surface area and material composition of an object influence the rate of thermal energy transfer?

By focusing on the surface area and material composition, we can investigate how these two variables affect the transfer of thermal energy. The surface area of an object determines the amount of area available for heat exchange, potentially affecting the rate of energy transfer. The material composition, on the other hand, can impact factors such as thermal conductivity, specific heat capacity, and emissivity, all of which play a role in how effectively heat is transferred.

To conduct the experiment, you can select objects of different materials and surface areas, such as metal plates or plastic blocks with varying dimensions. By exposing them to a controlled heat source and measuring the temperature change over time, you can analyze how the chosen variables affect thermal energy transfer.

This investigation would provide insights into the fundamental factors that influence heat exchange and can be used to inform practical applications in various fields such as engineering, materials science, and energy efficiency.

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We have that the cricket’s displacement is  

\(D_t=9meters\)

From the Question we are told that

Start position  5 meter mark

It jumps to the 10 meter mark.

it jumps back to the 6 meter mark.

Generally the equation for cricket’s displacement. is mathematically given as

\(D_t=Initial +final(displacement)\\\\D_t=(10-5)+(10-6)\)

\(D_t=9meters\)

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The correct statements concerning this collision are:

In a collision between two objects, the total momentum of the system is conserved. This means that the total momentum before the collision is equal to the total momentum after the collision. However, the kinetic energy of the system may not be conserved, as some of it may be lost to other forms of energy, such as heat, sound, or deformation of the objects involved.

When two vehicles collide, the total momentum of the system is conserved, but the kinetic energy of the system is not necessarily conserved. During the collision, both vehicles experience an equal and opposite average force, as required by Newton's Third Law of Motion. However, the change in momentum experienced by each vehicle depends on its mass and velocity before and after the collision. The small car will experience a greater change in momentum than the SUV because it has a smaller mass. Options A and C are correct

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Answer:What is the acceleration of a car that moves from rest to 15.0 m/s in 10.0 s? Vi=0, vf= 15.0 m/s,t=10.0s, a=? a= vf =vi/tA=15.0m/s-0m/s/10.0s = 15.0s/10.0s m/s*1/s =1.50 m/s^2 11.

Explanation:

Answer:  20 m/s

Explanation:

P = mv

since we're trying to find the velocity, you change the formula to v = P/m

v = ?

P = 9 kgm/s

m = 0.45 kg

v = 9 kgm/s / 0.45kg  = 20 m/s

Answer: molecular solid

Explanation:

3415.2 grams

Explanation

to solve this we can use a rule of three

Step 1

Let

water= 100-84%= 16%

so,

for the water , 1 mL = 1 gram , so

now, let represents the mass of the aluminiu, so

a) the ratio is the same, so we have a proportion

Step 2

finally, solve for x

so, the mass of the aluminum is

3415.2 grams

The rank of the terrestrial planets based on their expected cooling rates, from fastest cooling to slowest cooling is as follows -

mercury , Mars, Venus, Earth

Mercury - It is the smallest terrestrial planet in the solar system. It has a thin atmosphere, which causes it to swing between burning and freezing temperatures.

Mars - It is less dense than Earth and has a smaller magnetic field, which is a indication of a solid core rather than a liquid one. Mars is known to have water ice and organics- some of the ingredients for living things.

Venus - It is about the same size as Earth and has a thick, toxic carbon-monoxide (CO) dominated atmosphere that traps heat, making it the hottest planet in the solar system.

Earth - Out of the four terrestrial planets, Earth is the largest and has regular seasons for much of it surface; regions closer to the equator tend to stay warm, while spots closer to the poles are cooler and in the winter, icy.

Therefore, the cooling rate of terrestrial planets is Mars, Earth, Venus, Mercury

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On the following sentences:

Creative dancing is a form of dance that emphasizes self-expression, improvisation, and individual creativity. It is a style of dance that encourages dancers to explore and experiment with movement, without necessarily adhering to traditional or pre-established choreography.

In creative dance, the emphasis is on the process of dance-making, rather than the finished product, and the focus is on the dancer's own unique interpretation and expression of movement.

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Answer:

Please provide more information!

Explanation:

Answer:

1.75

Explanation:

Answer:

5.22 m/s²

Explanation:

From the question given above, the following data were obtained:

Initial velocity (u) = 0 m/s

Final velocity (v) = 12 m/s

Time (t) = 2.3 s

Acceleration (a) =.?

Acceleration is defined as the change of velocity with time. Mathematically, it is expressed as:

Acceleration (a) = final velocity (v) – initial velocity (u) / time (t)

a = (v – u) /t

With the above formula, we can obtain the acceleration of the racehorse as follow:

Initial velocity (u) = 0 m/s

Final velocity (v) = 12 m/s

Time (t) = 2.3 s

Acceleration (a) =.?

a = (v – u) /t

a = (12 – 0) / 2.3

a = 12 /2.3

a = 5.22 m/s²

Therefore, the average acceleration of the racehorse is 5.22 m/s²

Answer:

maximum horizontal distance = 10m

initial vertical velocity of the ball = 4.9m/s

Explanation:

Complete question

A ball is launched with an initial horizontal velocity of 10.0 meters per second. It takes 500 milliseconds for the ball to reach its maximum height.

Determine the maximum horizontal distance that the ball will travel.

Calculate the initial vertical velocity of the ball.

Maximum horizontal distance x is expressed as;

x = vT

T is total time of flight

T = 2t

Hence x = 2vt

v is the velocity

t is the time

Given

v = 10.0m/s

time t = 500ms = 0.5s

Horizontal distance = 2 * 10 * 0.5

Horizontal distance = 20 * 0.5

Horizontal distance = 10m

Hence the maximum horizontal distance that the ball will travel is 10m

To get the initial horizontal distance, we will use the equation of motion

v = u - gt

T maximum height, v = 0

Substitute

0 = u - 9.8(0.5)

-u = - 4.9

u = 4.9m/s

Hence the  initial vertical velocity of the ball is 4.9m/s

The name given to it is "terminal velocity".

In reality, it isn't a velocity, and it doesn't happen in free-fall.

Go figure.

First aid suggestions include:

Hold your face under running water for 15 to 20 minutes and allow the water stream to flood into your eyes. Use your fingers to hold your eyelids apart (make sure there is no trace of the chemical on your fingers).

If you wear contact lenses, remove them as soon as possible.

Seek immediate medical advice. Medical staff will need to know what chemical was involved, particularly whether it was acid or alkaline, liquid or powder.

Do not judge the seriousness of your eye injury on the degree of pain. For example, alkali chemicals don’t usually cause significant symptoms, but can seriously damage the eye.

Powder or particulate (granular matter, like wet concrete) chemicals can be particularly damaging since they are more difficult to flush out.

Answer:

immediately wash eyes with water

Answer:

Barack Hussein Obama II

Explanation:

I think

Main answer-

PE=mgh

KE=E-PE

V = (2*g*h)^½

at point A

PE = 10*9.8*50=4900 J

KE = 0 J  ( because the velocity of the body is 0)

V=0

at point B

PE = 10*9.8*35=3430 J

KE = 4900-3430=1470 J

V= ( 2*9.8*15)^ ½

V=17.14 m/s

at point C

PE= 10*9.8*25=2450 J

KE=4900-2450=2450 J

V= (2*9.8*25)^ ½

V=22.135 m/s

at point D

PE=10*9.8*0=0 J

KE=4900-0=4900 J

V=(2*9.8*50)^ ½

V=31.30 m/s

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A collection of voltaic cells (or piles) is called a battery.

What are voltaic cells?

Voltaic cells are chemical cells that generate electricity.

A series of voltaic cells connected together in a steel container which produce current as a result of oxidation reduction reaction.

In a voltaic cell there are two compartments where oxidation and reduction occurs simultaneously to produce current.

In each compartment there is an electron. The positively charged electrode is cathode(reduction) and negatively charged in anode (oxidation).

In general, the steel container in which a redox reaction occurs inside a voltaic cell is called a battery.

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Answer:

c. Y

Explanation:

Newton's third law of motion states that action and reaction are equal and opposite. Hence for every action, there is an equal and opposite reaction.

Considering the system of forces shown in the image, W and Y are  opposite forces. When the driver slams on the brakes, he will be pushed forward towards the windscreen. The force Y exerted by the seat belt keeps him on the drivers seat by moving him backwards towards the seat.

Answer:

1200 watts at a standard 120v draws 10 amps

Answer:

83.33s

Explanation:

velocity=300km/hr ,acceleration =1m/s2

But before we can make this calculation,we have to make sure that both the acceleration and velocity are in the same units.So I decided to Chang the velocity to m/s.

Converting 300km/hr into m/s;

Changing 300km into m=300000m

Changing 1hr into secs=3600sec

Velocity in m/s=83.33m/s

But Time =velocity/acceleration

=83.33/1

=83.33sec

You have to decide what you want.  Your question says "Find the average velocity", but the choices you listed are all times, not velocities.

(300 km/hr) x (1 hr / 3600 sec) = 83.33 meters/sec

-- If the airplane starts from rest and accelerates uniformly at 1 m/s², it'll take 83.33 seconds to reach takeoff speed.

-- If it starts from rest and accelerates uniformly to 83.33 m/s, then its average speed is 41.67 m/s no matter what its acceleration may be.