help me please ?
physics G10 .

To find the amount of heat extracted from the hot reservoir per cycle, we can use the formula for thermal efficiency:

Efficiency = (Work output / Heat input) * 100

Given that the thermal efficiency is 39% and the work per cycle is 85 J, we can set up the equation:

39% = (85 J / Heat input) * 100

To solve for the heat input, we rearrange the equation:

Heat input = (85 J / 39%) * 100

Calculating the result:

Heat input = (85 J / 0.39) * 100

Heat input ≈ 21794.87 J

Therefore, approximately 21794.87 J of heat is extracted from the hot reservoir per cycle in the given heat engine.

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1. it is true that the proton-proton chain is the main process that the Sun uses to generate energy.

2. The Sun emits the energy it does because of nuclear fusion reactions.

The primary source of energy in the Sun is nuclear fusion. The Sun's core is a hot and dense region where extreme temperatures and pressures exist. Under these conditions, hydrogen nuclei (protons) collide and fuse together to form helium nuclei. This process is known as nuclear fusion.

The specific fusion reaction that occurs in the Sun is called the proton-proton chain reaction. It involves a series of steps:

The overall result of these fusion reactions is the conversion of four hydrogen nuclei into one helium nucleus, releasing a tremendous amount of energy in the process.

Therefore,

1. it is true that the proton-proton chain is the main process that the Sun uses to generate energy.

2. The Sun emits the energy it does because of nuclear fusion reactions.

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The expression for the magnitude of the maximum friction force along the surface, fs, in terms of given quantities and variables available in the palette is Fs = Us mgcos(ø).

Fs = Us mgcos(ø) where,

Fs stands for  static friction coefficient

m= mass

g= gravity

cos(ø) = angle of friction

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Answer:

For any star whose apparent magnitude is the same as its absolute magnitude, the distance to the star would be 10 parsecs.

Explanation:

When the apparent magnitude (m) is equal to the absolute magnitude (M) of a star, the distance to the star can be determined as follows:

Step 1: Work out the fraction: (m - M) / 5 = (0 - 0) / 5 = 0/5 = 0

Step 2: Take the "anti-log": 10^(x) = 10^(0) = 1

Step 3: Multiply by 10: D = 10 * (step 2 number) = 10 * 1 = 10 pc

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Answer:

If the person rises 12 ft per revolution that person will

rise 18 ft in 1 and 1/2 revolutions

E = m g h = W h          where W is the weight of the person

E = 149 lb * 18 ft = 2682 ft-lbs

The force acting on the body by its weight is 656.6 N. The displacement for him is 2.4 m. Then the work done is 1595.5 J.

Work done is a physical quantity describing the force acted over a displacement. It is the dot product of force and displacement.

Given that, the weight of the person = 149 lb

1 lb = 0.45 kg

149 lb = 149 × 0.45 = 67 kg.

weight in Newton = 67 kg × 9.8 m/s² = 656.6 N

The displacement he made = 12 ft - 4 ft = 8 ft

1 ft = 0.3 m

then 8 ft = 8 × 0.3 = 2.4 m

Now, work done W = f. ds

W = 2.4 m × 656.6 N = 1595.5 J

Therefore, the work done by the person weighing 149 lb walking exactly one and a half revolution(s) up a circular, spiral staircase of radius 4 ft if the person rises 12 ft after one revolution is 1595.5 J.

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Answer:

each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.

"some elements have only one stable isotope"

Explanation:

there ya go! Pls give me brainliest!

Answer: Distance

Explanation:

When driving, it is important for one to always use safety belt and obey traffic rules.

During a collision, it is vital to always adhere to safety belts and also use occupant protection systems in order to help reduce the impact that an be felt during a collision. As you travel downhill, your vehicle needs less power to reach the bottom and your stopping distance increase.

Answer:.

They both rely on "reflected" sound waves.

Answer:

the acceleration is 13.53m/s^2

Explanation:

The computation of the acceleration is given below:

As we know that

Total force = Mass × acceleration

where

Total force is 230 N

And, the mass is 17 kg

So, the acceleration is

= 230 ÷ 17

= 13.53 m/s^2

hence, the acceleration is 13.53m/s^2

The coefficient of friction can be calculated by dividing the frictional force by the normal force acting on the block. The normal force can be determined by resolving the weight of the block into components parallel and perpendicular to the incline. At the angle where the box slides at a constant velocity, the force of friction will be equal in magnitude but opposite in direction to the component of the weight acting parallel to the incline.

First, calculate the normal force by finding the perpendicular component of the weight:

\(Normal force = Weight * cos(angle of incline)\).

\(Weight = mass * gravity\).

\(Weight = 2 kg * 9.8 m/s^2 = 19.6 N\).

\(Normal force = 19.6 N * cos(25) = 17.65 N\).

Next, calculate the coefficient of friction:

\(Coefficient of friction = Frictional force / Normal force\).

\(Coefficient of friction = 4.86 N / 17.65 N =0.275\).

Therefore, the coefficient of friction is approximately 0.275.

To determine the angle at which the block slides at a constant velocity, set the frictional force equal to the component of the weight acting parallel to the incline:

\(Frictional force = Weight * sin(angle of incline)\).

\(4.86 N = 19.6 N * sin(angle of incline)\).

\(sin(angle of incline) = 0.248\).

\(angle of incline=arcsin(0.248)\).

\(the angle of incline= 14.4\)°.

Therefore, the block will slide at a constant velocity when the incline is approximately 14.4 degrees.

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if the digital display on a thermometer reads 0110 1100 and the temperature ranges from -100 to 300 degrees (8 bit). the analogue quantity being measured is 84.71.

A thermometer is a device used to gauge temperature. It may gauge the temperature of a solid substance, like food, a liquid substance, like water, or a gas, like air. Celsius, Fahrenheit, and kelvin are the three most widely used units for measuring temperature. A component of the metric system is the Celsius scale. The metric system of measuring also contains units for length and mass, such as kilogrammes and kilometres. The official unit of measurement for practically all nations in the world is the metric system, which includes Celsius. The Celsius scale is commonly used in science to measure temperature. Water has a freezing point of 0 degrees Celsius and a boiling point of 100 degrees Celsius.

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The induced emf is given by the formula:ε = -dΦ/dtwhere Φ is the magnetic flux through the loop.The rectangular loop can be divided into two parallel straight wires that run parallel to the long wire. The magnetic flux through one of these wires is given by:

Φ = B×L×cosθwhere B is the magnetic field, L is the length of the wire, and θ is the angle between the wire and the magnetic field. Since the wire and the magnetic field are parallel, θ = 0, so cosθ = 1. Thus:Φ = B×LThe magnetic field at a distance d from the wire is given by the formula:B = μ₀I/2πrwhere μ₀ is the permeability of free space, I is the current, and r is the distance from the wire. Thus:B = (4π×10⁻⁷ T·m/A)×(a-bt²)/(2π×0.025 m)B = (a-bt²)/(50×10⁻⁴ m)Therefore, the flux through one of the wires is:Φ = B×L

= (a-bt²)×(0.25 m)×(1 m)×(1 N/A)×(1 T·m²/N) = 0.25(a-bt²) V·sThe total flux through the loop is twice this value, so:Φ = 0.50(a-bt²) V·sAt t = 1.16 s, a = 19.2 A, b = 1.58 AV/s², and t = 1.16 s, so:Φ = 0.50(19.2-1.58×(1.16)²) V·sΦ = 8.21 V·sThe induced emf is the negative time derivative of the flux, so:ε = -dΦ/dtε = -0.50×(-1.58×2.32)ε = 1.16 VTherefore, the magnitude of the induced emf is 1.16 V.:The total flux through the loop is given by the product of the flux through the individual wires, which is Φ = B L. So,Φ = B L = (a − b t²) L/ (2 π d) .The induced emf is given by the formula,ε = −dΦ/dt.

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The amount of current flowing through the other wire is 518.5A, whereas the 2.25-meter segment of wire feeding power to a submerged submarine's motor has a capacity of 750A and a resistance of 3.5N.

In physics, magnitude is referred to as an object's maximal size and direction. In both vector and scalar quantities, magnitude is a common factor. We know that scalar quantities are those that have magnitude and nothing else by definition. The movement of electrical charge carriers like electrons is known as current. Positive and negative locations both experience current flow. The ampere is the SI unit for calculating electrical current (A). One coulomb of electrical charge travelling across a certain place in one second is referred to as one ampere of current.

I2 = 3.5*5*10^-2/2*750*2.25*10^-7

I2 = 518.5A

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Answer:

Hand soap: basic

chocolate milk: neutral

apple juice: acidic

shampoo: acidic

mouthwash: acidic

tap water: basic

Explanation:

Check your PH scale

1-6 = acidic

7 = neutral

8-14 = basic

Answer:

1 deg C = 5/9 deg F         (Ex. 212 F - 32) * 5/9 = 100

So deg F = 9/5 deg C = 9/5 * 2.9 = 5.2 deg F

Answer:

These has anwers and also the solution. You can recheck if you want.

Answer: i guess d is the correct answer

Answer:

D

Explanation:

I used this and passed my test! good luck!

Answer:

\(||\vec E_A||=1.11446 \times 10^6 \ \frac{N}{C}\), where the vector arrow will point from the charge towards point A.

Conceptual:

What is an electric field?

An electric field is a physical field produced by charged particles, these electric fields have the ability to exert forces on other charged particles. The following formula can be used to find the electric field (as a vector) at a point in space. "k_e" is Coulomb's constant and "\(\hat r\)" indicates the direction vector that point from the charge towards the field you are trying to calculate.

\(\boxed{\left\begin{array}{ccc} \text{\underline{Equation for Electric Field:}} \\\\\ \vec E=\frac{k_eq}{r^2} \hat r \\k_e=8.99 \times 10^9\frac{Nm^2}{C^2} \end{array}\right }\)

Explanation:

Given:

\(q=6 \times 10 ^{-6} \ C\\\\r=0.22 \ m\)

Find:

\(\vec E_A=?? \ \frac{N}{C}\)

\(\vec E_A=\frac{k_eq}{r^2} \hat r\\\\\Longrightarrow \vec E_A=\frac{(8.99 \times 10 ^9)(6 \times 10 ^{-6})}{(0.22)^2} \cdot\frac{ < 0,-0.22 > }{\sqrt{(0)^2+(-0.22)^2} } \\\\\Longrightarrow \vec E_A= 1.11446 \times 10^6 \cdot < 0,-1 > \\\\\Longrightarrow \vec E_A= < 0,-1.11446 \times 10^6 > \frac{N}{C} \\\\\Longrightarrow||\vec E_A||=\sqrt{(0)^2+(-1.11446 \times 10^6\))^2} \\\\\therefore \boxed{\boxed{||\vec E_A||=1.11446 \times 10^6 \ \frac{N}{C}}}\)

Thus, the electric field strength at point A is found. The vector arrow will point from the charge, q, towards point A.

From the calculation;

1) Melting point of indium = 171.4°

2) The resistance is 52.9 ohm

3) The power dissipated is  834 W

The temperature coefficient of resistance is a measure of how much the resistance of a material changes with temperature. It quantifies the relationship between the change in resistance and the change in temperature.

We have that;

R1/R2 = (1 + αt1)/(1 + αt2)

50/76.8 = (1 + (3.92 * \(10^-3\) * 20))/(1 +  (3.92 *\(10^-3\) * t))

0.65 = 1.0784/1 + 0.00392t

0.65(1 + 0.00392t) =  1.0784

0.65 + 0.0025t = 1.0784

t = 171.4°

P = \(V^2\)/R

R = \(V^2\)/P

R = \(230^2\)/1000

R = 52.9 ohm

The new power is;

P =\(210^2\)/52.9

P = 834 W

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Answer:

The amount of energy required is 4.08 J.

Explanation:

Given,m1 = m2 = 0.55-kgR = 14 cm = 0.14 m The distance between the two basketballs d = 1.1 m

Energy required to change the separation between the centers of the basketballs to 1.1 m is given by the formula; E = K1 + K2 - U where K1 = kinetic energy of ball 1K2 = kinetic energy of ball 2U = potential energy

Let's calculate K1,K2, and U: K1 = 0.5 mv²where m = mass of ball v = velocity of ball Initial velocity of ball = 0 m/s Final velocity of ball v = 0.5 m/sK1 = 0.5 × 0.55 × (0.5)²= 0.069 JK2 = 0.5 mv² Initial velocity of ball = 0 m/s .

Final velocity of ball v = - 0.5 m/sK2 = 0.5 × 0.55 × (- 0.5)²= 0.069 J Let's find out the potential energy; U = (kQ1Q2) / d

where Q1 = Q2 = Q d = distance between the centers of two balls U = (kQ²) / d where k = Coulomb's constant = 8.99 × 10⁹ Nm²/C²Q = charge on a ball = 0 (because it is an uncharged object) U = 0.

Therefore, E = K1 + K2 - U= 0.069 + 0.069 - 0= 0.138 J Therefore, the amount of energy required is 4.08 J.

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Answer:

In contrast, our atmosphere blocks most ultraviolet light (UV) and all X-rays and gamma-rays from reaching the surface of Earth. Because of this, astronomers can only study these kinds of light using detectors mounted on weather balloons, in rockets, or in Earth-orbiting satellites.

Explanation:

Answer:

Ultraviolet

Explanation:

Along with gamma rays and x-rays.

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Explanation:  Diffusion requires energy only to move material in through the cell membrane. Diffusion does not require energy in any situation. Diffusion requires energy only to move material out through the cell membrane.

Answer:

The answer is B >:3

Explanation:

Energy can neither be created nor destroyed during a chemical reaction but it can only be transformed from one form of energy to another form of energy.

Energy transformation refers to energy conversion from one form of energy to another form of energy.  such as in a hydroelectric dam that transforms the kinetic energy of water into electricity. The work of the energy transformations that take place in living organisms the leads to work.

While energy can be transformed, the total quantity of energy remains the same so  this is known as energy conservation.

So we can conclude that Energy transformation also known as energy conversion, is the procedure of changing energy.

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The modulus of elasticity, E, is a measure of a material's stiffness and ability to resist deformation when a force is applied. It is defined as the ratio of stress to strain within the elastic range of the material. In other words, it describes how much a material will stretch or compress under a given force.

The modulus of elasticity is important because it allows engineers to predict how materials will behave under different conditions, such as temperature changes, loading conditions, and other factors. It also helps to determine the maximum load a material can withstand before it starts to deform or break.

In detail, the modulus of elasticity is a fundamental property of a material that describes its ability to resist deformation when subjected to external forces. It is calculated by measuring the stress and strain of the material and using the equation E = σ/ε, where σ is stress and ε is strain.

The modulus of elasticity is important in many areas of engineering, such as structural design, materials science, and mechanics. It helps to ensure that structures and materials are designed and tested to withstand the loads and stresses they will be subjected to, and it provides a basis for comparing different materials and choosing the best one for a particular application.

In summary, the modulus of elasticity, E, is a material property that describes its stiffness and resistance to deformation. It is correctly determined using Hooke's Law and is crucial for predicting the mechanical behavior of materials when subjected to stress.

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The velocity of the load right after the brake of the lorry is suddenly applied at t = 6 s, is 16.9 m/s.

The velocity of the load is determined from the ratio of the load displacement and time taken.

Mathematically, the formula for displacement is given as;

Displacement = change in displacement / change in time

The displacement of the load at 6 seconds is calculated as;

D = area under the curve

D = (15 s - 6 s ) x (20 m/s - 0 m/s)  +  ¹/₂ (19 s - 15 s ) x (20 m/s - 0 m/s)

D = 180 m  + 40 m

D = 220 m

The velocity of the load;

v = ( 220 m ) / (19 s - 6 s )

v = 16.9 m/s

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Answer: If there is a higher friction, the opposition force is higher so that it can reduce our speed. So, a factor that affects friction is the roughness or smoothness of the surface of the object. In comparison of the table with the fabric, the fabric will have a more opposition force. As the surface of the fabric is usually rougher than the surface of a smooth table. As there is more friction on a fabric, we will feel more opposition force on our finger tip.

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Answer:

Explanation:

As the ball rises, its PE increases because the potential energy is equal to the mass of the ball times gravity times the height of the ball. The higher the height, the higher the PE.

Answer:

According to the law of conservation of energy its kinetic energy is getting converted in to potential energy because of gain in height. So, if the velocity of a ball goes on decreasing when it is thrown vertically upwards. When its velocity becomes zero, its potential energy becomes maximum.

The magnitude of the unit vector of the forces is 182.92 N and the direction is 56.87⁰.

A unit vector is a type of quantity that has both magnitude and direction.

A unit vector can also be described as a single vector that can represent two vectors in terms of magnitude and direction.

A resultant vector is defined as a single vector that produces the same effect as is produced by a number of vectors collectively.

The unit vector of the two forces is calculated as follows;

R² = Fx² + Fy²

where;

R = √( Fx² + Fy²)

R = √( 100² + 153.2²)

R = 182.95 N

The direction of the vector is calculated as follows;

θ = arc tan (Fy/Fx)

θ = arc tan (153.2 / 100)

θ = 56.87⁰

Thus, the magnitude of the unit vector of the forces is 182.92 N and the direction is 56.87⁰.

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