a battery of emf and negligible internal resitance, three identical incandescent lightbulbs and a switch s that is initially open are connected in the circuit shown above

Answer: 5.96m/s

Explanation:

Given the following :

Mass of car (m) = 1500kg

Velocity (V) = 5.25m/s

Forward force of engine = 1250N

Diatance moved = 4.8m

Final Velocity =?

Final kinetic energy = Initial kinetic energy + work done by engine

Initial kinetic energy = 0.5 × mass × velocity^2

Initial kinetic energy = 0.5 × 1500 × 5.25^2

Initial kinetic energy = 20671.875 J

Work done by engine = Force × distance

Work done by engine = 1250 × 4.8 = 6000J

Final kinetic energy = (20671.875 + 6000) J

= 26671.875 J

From kinetic energy = 0.5mv^2

26671.875 = 1/2 × 1500 × v^2

53343.75 = 1500v^2

v^2 = 35.5625

v = sqrt(35.5625)

v = 5.96m/s

Inert gases require high temperatures and pressures to react with other elements.

A gas is considered to be inert if, under a specific set of circumstances, no chemical reactions occur. The noble gases, formerly known as the inert gases, frequently do not react with a wide variety of substances as argon and neon (at normal conditions).

Because they contain a fully filled valence shell and an electronic configuration of ns²np⁶, inert gases do not react with other chemicals.

As a result, they are referred to as noble gases and are in the periodic table's group 18.

But under  high temperatures and pressures Inert gases react with other elements.

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Nowadays, breeders work to produce animals and plants with desirable phenotypic qualities, such as high crop yields, disease resistance, quick growth, and many other phenotypic traits. Option C is right as a result.

Selective breeding is used. a process for creating an organism from parents who already have the required characteristics. a natural method of breeding offspring with desired traits.

Breeders today strive to create animals with desired phenotypic characteristics, such as high crop yields, disease resistance, rapid growth, and many other phenotypic traits.

Thus, the correct option is C.

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Your question seems incomplete, the probable complete question is:

Which of the following questions would be most helpful in gathering information about selective breeding?

A. What traits in a chicken would be beneficial for humans?

OB. How long does it take for dogs to reproduce and birth puppies?

O C. How do wild cactus plants reproduce in the desert?

D. Why do peaches only grow in the summer?

(a) The equivalent resistance of the circuit is 0.52 ohms.

(b) The total electric current that runs through the circuit is 40.38 A.

(c) The value of the electric current passing through the resistor of 1.0 Ohm is 21 A.

(d) The power dissipated through the 8.0 Ohm resistor is 55.13 W.

The equivalent resistance of the circuit is calculated as follows;

1/R = 1/(1 + 1) + 1/(2 + 2 + 2) + 1/(6) + 1/(2) + 1/8 + 1/8 + 1/6 + 1/6

1/R = 1/2 + 1/6 + 1/6 + 1/2 + 1/8 + 1/8 + 1/6 + 1/6

1/R = 1 + 2/3 + 1/4

1/R = 23/12

R = 12/23

R = 0.52 ohms

V = IR

I = V/R

I = 21/0.52

I = 40.38 A

V = IR

I = V/R

I = 21/1

I = 21 A

P = V²/R

P = (21)²/8

P = 55.13 W

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The EMF of the secondary in a step-up transformer is 3,600 V.

The transformer consists of two coils, namely the primary coil and the secondary coil. A step-up transformer will have a higher number of turns in the secondary coil and a higher voltage across the secondary coil. According to the formula

Np ÷ Ns = Vp ÷ Vs

Np ÷ Ns = Is ÷ Ip

Np ÷ Ns = Vp ÷ Vs

500 ÷ 15,000 = 120 ÷ Vs

Vs × 500 = 120 × 15,000

Vs × 500 = 1,800,000

Vs = 1,800,000 ÷ 500

Vs = 3,600 V

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Answer:

The amount of heat needed to heat  2 kilograms of water from 24.0°C to 100.0°C to make a cup of tea is (C) 640,000 J.

Explanation:

How to calculate the amount of heat needed?

        Q = m s Δ t

        where Q = the amount of heat needed

        m = mass of the substance being heated

        s = specific heat of the substance being heated

        and Δ t = the difference between the final and initial temperatures.

It is given that 2 kilograms of water are to be heated from 24.0°C to 100.0°C to make a cup of tea and the specific heat of water is 4186 J/kg°C.

Therefore,

Putting these values in the equation Q = m s Δ t we find,

Q = 2 x 4186 x 76 J

    = 636272 J

    ≈ 640,000 J.

Thus the amount of heat needed to heat  2 kilograms of water from 24.0°C to 100.0°C to make a cup of tea is (C) 640,000 J.

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ANSWER

EXPLANATION

Ice is the solid state of water - think about ice cubes you'd use to cool a soda, they are in solid state.

Water at room temperature is always liquid - remember that 'room temperature' is about 25°C.

The correct answer is opposite to the displacement.

The spring force is the force which is exerted by the spring when it is attached with an object.

When we attach a spring to an object and the object is displaced from equilibrium, then there will be a force acting on the spring which will retract the spring to come back to equilibrium.

This is spring force.

According to the Newton's third law, there is always an equal and opposite force. Here, if we are applying a force to displace the object. This force is applied on the object so it is towards the object. Then there is an equal and opposite force which is applied on the spring which tends to pull the object back to its equilibrium position. This force which acts opposite to the displacement of the object to bring spring back to equilibrium is the spring force.

Therefore, we can conclude that, in general, the spring force always points opposite to the displacement from equilibrium.

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The maximum stress on the strut is 66.7 MPa when subjected to a compressive load of 20.0 kN, and the minimum stress is -26.7 MPa when subjected to a tensile load of -8.0 kN.

To find the maximum and minimum stress, we need to calculate the axial stress using the formula: stress = force/area. The cross-sectional area of the strut is 10.0 mm x 30.0 mm = 300.0 mm^2. When a compressive load of 20.0 kN is applied, the stress is calculated as 20.0 kN / 300.0 mm^2 = 66.7 MPa (compressive). When a tensile load of -8.0 kN is applied, the stress is calculated as -8.0 kN / 300.0 mm^2 = -26.7 MPa (tensile). Therefore, the maximum stress is 66.7 MPa and the minimum stress is -26.7 MPa.  The maximum stress on the strut is 66.7 MPa (compressive) when subjected to a load of 20.0 kN, and the minimum stress is -26.7 MPa (tensile) when subjected to a load of -8.0 kN. This is calculated using the formula stress = force/area, with a cross-sectional area of 300.0 mm^2.

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The maximum energy that the electron can obtain is approximately 29.2 keV.

An electron is a subatomic particle that has a negative electric charge. Electrons are found outside the atomic nucleus in shells or orbitals and play a crucial role in determining the chemical properties of an element. Electrons are involved in chemical reactions, electrical conductivity, and thermal conductivity. They are also involved in the transfer of electrical energy in electronic devices such as computers, smartphones, and televisions. Electrons have a mass of approximately 9.11 x 10^-31 kg, which is much smaller than the mass of the other subatomic particles, such as protons and neutrons.

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Answer:

0.729

Explanation: by using ohms laws

Answer:

The act of immediately discharging electrical energy into the Earth directly with the aid of a low-resistance wire is known as earthing. Electrical earthing is accomplished by attaching the equipment's non-current-carrying component or the supply system's neutral section to the ground.

Four reasons why it's crucial to ground electrical equipment:

1. Increased longevity of appliances: Grounding electrical appliances results in less stress on the equipment and a reduction in the exposure of the appliances to hazardous currents.

2. Eradication of fire risk: If there is a problem with the insulation, there may be a spark, which could cause a fire and damage to property. The risk of fire is decreased by grounding electrical equipment by sending leakage current from insulation faults to the ground.

3. Protection from electrical surges: Electrical surges, whether brought on by lightning or for other reasons, produce dangerously high voltage. All the hazardous electricity will flow to the ground rather than causing harm to the electrical system if your appliances or electrical system as a whole is grounded.

4. Voltage Stabilization: Ideally, the ground's potential is zero. Therefore, all electrical devices use the earth as a point of reference. Calculating the required potential for each electrical appliance would be challenging without a reference point.

Electrocution is the term for when electricity enters the body. Burns, respiratory failure, neurological effects, and heart failure are all results of high-current electric shock. It might even result in death. Therefore, in the event of an insulation fault, a safe path for the current to flow must be provided via earthing.

Explanation:

The Earth serves as an efficient pathway for the flow of electrons that escape the insulation because it is a good conductor of electricity. Additionally, the Earth's enormous size creates a pathway for the safe discharge of electric charge. No current escapes from a device that is properly grounded. In the event that the device develops an internal problem, this stops people from being shocked or electrocuted. Electronic equipment is stabilized by earthing. It shields appliances from over-current or excessive voltage. Earthing is another fire safety measure. Overvoltage can cause a device to spontaneously combust due to overheating.

Answer:

C. 28.39 gram

Explanation:

Steps:

m = V × ρ

= 34 cubic centimeter × .835 gram/cubic centimeter

= 28.39 gram

The solar system shows the planets in their orbits around the sun in this order: Mercury, Venus, Earth with Moon, Mars, Jupiter, Saturn. Fixed stars are around the outside of the orbit of Saturn.

Explanation:

Aristarchus of Samos was an ancient Greek astronomer and mathematician who presented the first known heliocentric model that placed the Sun at the center. So I had to choose the choice that was most similar to that.

Answer:

the water is going to boil and the mercury ill melt and shoot the cork out the bottom of the tube

Explanation:

H=132.3m and U=29.4ms−1 are height and velocity respectively.

What is motion?

Motion is a change in position of an object over time. It occurs when an object moves from one point to another. Motion can be described in terms of displacement, distance, speed, velocity, and acceleration. Motion can also be described using Newton's laws of motion which state that an object in motion will remain in motion unless acted upon by an external force. Motion also describes the motion of particles in a fluid or gas, as well as the motion of waves in a medium. Motion is an essential part of the physical world and is essential for understanding the fundamental laws of nature.

Motion in a straight line

Let,

u = Initial velocity of stone

H = Maximum height attained by the stone

v = final velocity at maximum height = 0

t = time taken to attain maximum height = 3s

a=−g= acceleration due to gravity

a. We know that,

V=u+at

0=u−g×3

U=3g=3×9.8ms−2

U=29.4ms−1

b. From the equations of motion, we know that,

S=ut+ ½ a t2

H=29.4×3+½ * 9.8 *32

H=88.2+44.1

H=132.3m

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Answer:

T = 3.17 s

Explanation:

Given that,

The length of the pendulum, l = 2.5 m

We know that the period of oscillation of the pendulum is given by :

\(T=2\pi \sqrt{\dfrac{l}{g}}\)

Where

g is the acceleration due to gravity

\(T=2\pi \sqrt{\dfrac{2.5}{9.8}}\\\\T=3.17\ s\)

So, the period of oscillation is equal to 3.17 s.

The terminal speed of the marble is 0.588 m/s.

Given:

We know that,

F = mg                          ......(1)

where,

F = force

m = mass

g = acceleration due to gravity

Also,

v = F/k                            ......(2)

where,

v = terminal speed

k = proportionality constant

Substituting the value of F from equation (1) in equation (2)

v = mg/k                             .......(3)

Given,

m = 30 g = 0.030 kg

k = 0.500 kg/s

g = 9.8 m/s²

To find,

v =?

Put the values in equation (3)

v = mg/k        

v = 0.03(9.8)/ 0.500

= 0.294/0.500

= 0.588 m/s

​

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Answer:

Some of the key characteristics of galaxies and galaxy clusters include their size, shape, and structure. Galaxies and galaxy clusters are also distinguished by the presence of dark matter, a mysterious substance that is thought to make up most of the mass in the universe. Additionally, galaxies and galaxy clusters are important sites for the formation and evolution of stars and other celestial objects.

Explanation:

Galaxies are vast collections of stars, gas, and dust that are held together by gravity. They come in a variety of shapes and sizes, ranging from small, irregular galaxies to large spiral galaxies with well-defined arms. Galaxies also contain a central region known as the nucleus, which may be home to a supermassive black hole.

Galaxy clusters are groups of galaxies that are held together by gravity. They are the largest structures in the universe, and they can contain hundreds or even thousands of individual galaxies. Galaxy clusters are typically separated by vast distances, and they are bound together by the mutual gravitational attraction of their constituent galaxies.

Answer:

uniform an uniform

please fill it like yhis

Answer:

Vector points up in NE direction at an angle of 26.57° from the horizontal. The size of the vector is 22.36N

Explanation:

This is a problem relating to two vectors and the addition of the two vectors to get the resultant force

The two vectors are 10N pointing North (+ve y-axis) and 20N pointing East (+ve x-axis

These are indicated by their (x, y) values

So we have (0, 10) pointing north and (20,0) pointing east

Use the head-to-tail method to graphically add the two vectors. The tail of the 10N vector arrow is placed at the head of the 20N vector arrow

Then draw an arrow from the tail of the first vector to the head of the second vector to get the resultant vector. The resultant vector is (20, 10)

See the graph

The magnitude of the resultant vector is given by the Pythagorean theorem

= \(\sqrt{(20^2 + 10^2} \\\\= \sqrt{400 + 100} \\\\= \sqrt{500}\\\\=22.36068N\\\\The angle of the vector , $\theta$, relative to the x-axis is computed by the formula $\tan\theta = \dfrac{A}{B}$\\\\So, $\theta$ = tan^{-1}\left(\dfrac{10}{20}\right) \\= tan^{-1}\left(\dfrac{1}{2}\right) \\\\= 26.57^\circ$\\\\\\\)

Answer:

Two or more capacitors are said to be connected in parallel if each one of them is connected across the same two points. In a parallel combination of capacitors potential difference across each capacitor is same but each capacitor will store different charge.

Answer:

The first four resonance frequency in the string are;

1) 50·√50 Hz

2) 100·√50 Hz

3)150·√50 Hz

4) 200·√50 Hz

Explanation:

The given parameters of the string are;

The density of the string, ρ = 0.01 kg/m

The tension force on the string, T = 5 N

The length of the string, l = 0.1 m

Therefore the mass of the string, m = Length of string × Density of the string

∴ m = 0.01 kg/m × 0.1 m = 0.001 kg

The formula for the fundamental frequency, f₁, is given as follows;

\(f_1 = \dfrac{\sqrt{\dfrac{T}{m/L} } }{2 \cdot L} = \dfrac{\sqrt{\dfrac{T}{\rho} } }{2 \cdot L}\)

Where;

f₁ = The fundamental frequency in the string

T = The tension in the string = 5 N

m = The mass of the string = 0.001 kg

L = The length of the string = 0.1 m

ρ = The density of the string = 0.01 kg/m

By plugging in the values of the variables, we have;

\(f_1 = \dfrac{\sqrt{\dfrac{5}{0.01} } }{2 \times 0.1} = 50 \cdot \sqrt{5}\)

The first four harmonics are;

f₁, 2·f₁, 3·f₁, 4·f₁

Therefore, we have the first four resonance frequency of the string are as follows;

1 × 50·√50 Hz = 50·√50 Hz

2 × 50·√50 Hz = 100·√50 Hz

3 × 50·√50 Hz = 150·√50 Hz

4 × 50·√50 Hz  = 200·√50 Hz

Answer:  Waves are periodic disturbance of a medium that transmit carrying energy but not matter.

Depending on which direction the particles oscillate, waves are divided into two types:

- Transverse waves: in these waves, the oscillations occur in a direction perpendicular to the direction of motion of the wave. Examples of transverse waves are the vibrations in a guitar string.

- Longitudinal waves: in these waves, the oscillations occur back and forth along the direction of motion of the wave. Examples of longitudinal waves are sound waves.

As a result, amplitude and wavelength are measured differently in the two types of waves. In particular:

- The amplitude in a transverse wave is measured as the distance between the equilibrium position and the maximum displacement of a particle in the wave, in the direction perpendicular to the motion of the wave. On the other hand, in a longidutinal wave this distance is measured as the maximum displacement along the direction of propagation of the wave.

- The wavelength in a transverse wave is measured as the distance between two consecutive crests (points of maximum displacement) of the wave. For a longitudinal waves, there exist no crests, but regions of highest density of the particles (compressions) and of lowest density of the particles (rarefactions), so the wavelength is measured as the distance between two consecutive regions of compressions (or rarefactions).

Explanation:

Answer:

Transverse waves carry molecules at right angles to the direction in which the wave travels. Within a cycle, molecules move from their normal position to the highest position, back through the normal position to the lowest point, and then back to the normal position. The molecules retain their horizontal positions while vibrating vertically. Amplitude is measured at right angles to the direction of the travel of the wave. Wavelength can be represented as the distance between any two molecules in phase with each other, such as the two nearest molecules at the crests of the wave.

Longitudinal waves carry molecules parallel to the direction in which the wave travels. Within a cycle, a molecule travels in the same direction as the wave (from normal position to its most distant point on one side of its normal position), changes direction, moves back through its normal position to the opposite side of its normal position at a point that corresponds, and then returns to its normal position. The molecules don’t all move at the same time; some remain stationary as others go through a vibrating motion. Compressions and rarefactions occur here. Amplitude is measured parallel to the direction of the wave. Wavelength may be represented as the distance between the two nearest molecules that didn’t vibrate, the two nearest molecules at maximum compression, or the two nearest molecules at maximum rarefaction.

f = 1⁄T  

f = 1⁄0.03  

f = 33. 3 Hz

The first wave has a frequency of 33.3 Hz:  

f1 = 1⁄T1  

f1 = 1⁄0.03  

f1 = 33. 3 Hz

The second wave has a frequency of 4 Hz. f2 = 1⁄T2  

f2 = 1⁄1⁄4  

f2 = 1 ÷ 1⁄4  

f2 = 1 × 4⁄1  

f2 = 1⁄1 × 4⁄1  

f2 = 4 Hz

Therefore, the first wave has a higher frequency.

v = I⁄T  

v= 4.5⁄0.007  

v = 642.9 m/s

Wavelength

Crest

Trough

Amplitude

Explanation:

Answer:

1.944m_s²

Explanation:

First convert speed from km/h to m/s the use the formula a=v-u

t

Answer:

average speed = 0.5 m/s

Explanation:

average speed = (distance) / (elapsed time)

Given time elapsed = 30 seconds and distance = 15 meters

average speed = 15 meters / 30 seconds = 0.5 meters/second = 0.5 m/s

Answer:

35 Joules

Explanation:

Applying

Input Energy(Q) = Useful energy output(U)+Wasted Energy(W)

Q = U+W.............................. Equation 1

Make U the subject of the equation

U = Q-W................... Equation 2

From the question,

Given: Q = 120 Joules, W = 85 Joules

Substitute these values into equation 2

U = 120-85

U = 35 Joules

Answer:

v = 46.67 km/h

Explanation:

We will use the following formula throughout this numerical:

s = vt

where,

s = distance covered

v = speed

t =  time taken

FOR FIRST 30 km:

s = 30 km

v = 30 km/h

t = t₃₀ = ?

Therefore,

30 km = (30 km/h)(t₃₀)

t₃₀ = (30 km)/(30 km/h)

t₃₀ = 1 h

FOR TOTAL 100 km:

s = 100 km

v = 40 km/h (Average Speed)

t = total time = ?

Therefore,

100 km = (40 km/h)(t)

t = (100 km)/(40 km/h)

t = 2.5 h

FOR LAST 70 km:

s = 70 km

t₇₀ = t - t₃₀ = 2.5 h - 1 h = 1.5 h

v = v₇₀ = ?

Therefore,

70 km = v(1.5 h)

v = 70 km/1.5 h

v = 46.67 km/h