1. How much thermal energy does a 2kg steel block
(c=450J/kg°C) lose when it cools from 300°C to 20°C?

please help me and show the working out. ​

ANSWER:

a) 5 V

b) 8.33 A

c) step-up transformer

STEP-BY-STEP EXPLANATION:

a)

To calculate the input voltage it would be:

b)

To calculate the output current it would be:

c)

We have to:

Step-up transformer increase the output voltage.

Step-down transformer reduces the output voltage.

In this case, the voltage goes from being 5 V to being 12 V, therefore the output voltage increases, which means that it would be a step-up transformer.

Answer:

The frequency of the wave is 5 Hz

Explanation:

Wavelength is the minimum distance between two successive points on the wave that are in the same state of vibration. It is expressed in units of length (m).

Frequency is the number of vibrations that occur in a unit of time. Its unit is s – 1 or hertz (Hz).

The propagation velocity is the speed with which the wave propagates in the medium, that is, it is the magnitude that measures the speed at which the wave disturbance propagates along its displacement. Relate the wavelength (λ) and the frequency (f) inversely proportional using the following equation: v = f * λ.

In this case:

Replacing:

50 \(\frac{m}{s}\) = f* 10 m

Solving:

\(f=\frac{50 \frac{m}{s} }{10 m}\)

f=5 Hz

The frequency of the wave is 5 Hz

(a) The spring constant is 500 N/m.

(b) The extension of the spring when 25 N force is applied is 0.05 m.

(c) The applied force to cause an extension of 5 mm is 2.5 N.

The given parameters:

The spring constant is calculated as follows;

\(F = kx\\\\k = \frac{F}{x} \\\\k = \frac{10}{20 \times 10^{-3}} \\\\k = 500 \ N/m\)

The extension of the spring when 25 N force is applied is calculated as follows;

\(F = kx\\\\x = \frac{F}{k} \\\\x = \frac{25}{500} \\\\x = 0.05 \ m\)

The applied force to cause an extension of 5 mm is calculated as follows;

\(F = kx\\\\F = 500 \times 5 \times 10^{-3}\\\\F = 2.5 \ N\)

Learn more about Hook's law here: https://brainly.com/question/12253978

Answer:Electricity works by getting a bunch of conductor elements together and creating a flow of electron-stealing patterns through them. This flow is called a current. ... Once you can control the direction the electrons are going, you can use them to power or charge anything from a light bulb to your TV to your electric car.

Explanation:trust

Answer: a=F/m , a = 300N/25N , a= 12 m/s2

Explanation: Divide the 300 by 25 you get 12 . If your wondering how i got 25N in the eqaution it because you change 25kg to 25N. I hope this helps you

Acceleration of an object is the force divided by mass. The acceleration of the roller coaster to push the 25 kg person with a force of 300 N is 12 m/s².

Acceleration is a physical quantity measuring the rate of change in velocity. It is a vector quantity having both magnitude and acceleration. Acceleration has the unit of m/s².

According to Newton's second law of motion, the force acting on a body is the product of its mass and acceleration.

F = ma

Given that, mass of the person = 25 kg

force applied on the body = 300 N

acceleration = force/mass

a = 300 N/25 kg = 12 m/s²

Therefore, the acceleration of the roller coaster is 12 m/s².

Find more on acceleration:

https://brainly.com/question/3046924

#SPJ2

Texture: The texture of a substance can differ with a physical change.

Color: The changing of color of a substance is not necessarily an indicator of a chemical change.

Answer:

120 Nm-1

Explanation:

Según la ley de Hooke;

F = Ke

F = fuerza sobre el resorte

K = constante de fuerza

e = extensión

Por eso;

K = F / e

K = 24N / 20 × 10 ^ -2m

K = 120 Nm-1

The correct statement among the options provided is B.

The amplitude affects the period; thus, the amplitude must be kept constant for every trial. The amplitude of an oscillation affects its period, and therefore, it is important to keep it constant to obtain accurate results when measuring the spring constant of a horizontal ideal spring. If the amplitude is not constant, it will affect the period and the results obtained from the experiment.

Regarding the second question, neglecting to add the mass of the hanger to the values of the attached masses for the spring will result in inaccurate data. The correct equation for the period of an oscillating vertical spring-object system is T = 2π√(m/k), where m is the total mass (including the hanger) and k is the spring constant. Therefore, the graph that best represents the student's recorded data would be a graph of the square of the period (T^2) versus the total mass (m), and the slope of the graph would be equal to 4π^2/k.

Learn more about Experimental Spring Oscillation.

brainly.com/question/23365867

#SPJ11

Answer:

Wavelength.

Explanation:

1 period, or wavelength, is measured from one crest to another or from one trough to another.

The induced emf near the solenoid's center has a magnitude of 0 V/m.

At a location 0.500 cm from the solenoid's axis, the induced electric field has an intensity of 8 x 105 V/m.

the settings provided;

The following formula is used to determine the size of the induced emf close to the solenoid's center:

B = 4π × 10⁻⁷ × 700 × 36

  = 0.032 T/s

E = r/2(dB/dt)

E = 0/2*(0.032)

E = 0 V/m

The following formula is used to determine the strength of the induced electric field at a position 0.500 cm from the solenoid's axis:

E = r/2(dB/dr)

E = {(0.5 * 10⁻²)/2}*(0.032)

E = 8 × 10⁻⁵ V/m

Please visit the following page to learn more about solenoids:

https://brainly.com/question/14003638

#SPJ4

Answer: a

Explanation: :)

Answer:

3 N right.

Explanation:

The vector in red is 5 units long pointing towards right.

it's length represents its magnitude.

The other one, the one in blue, is pointing towards left, I. e., in a direction opposite to the red one.

It covers 2 units on the graph so we can say ots magnitude is 2 units.

Since, the two vectors are in opposite directions, the magnitude of their resultant will be equal to their difference, and it will be directed towards the vector with larger magnitude.

here, red has larger magnitude and it's direction is right, so the direction of resultant will be right.

magnitude :-

\( \red{5} - \blue{2} \\ = 3 \: units\)

I believe it's true.

b. Momentum is conserved.

c. Objects always stick together after an inelastic collision.

d. One object may be stationary before an inelastic collision.

In an inelastic collision, there are certain conditions that apply to the collision itself and the behavior of the objects involved. Let's examine each option in detail:

a. Energy is conserved: In an inelastic collision, energy is not conserved. Some energy is typically lost in the form of heat, sound, or deformation of the objects involved. This loss of energy is due to the internal forces and interactions within the objects during the collision.

b. Momentum is conserved: Conservation of momentum is a key characteristic of an inelastic collision. In an inelastic collision, the total momentum of the system before the collision is equal to the total momentum after the collision. This means that the sum of the individual momenta of the objects involved remains constant.

c. Kinetic energy is conserved: Kinetic energy is not conserved in an inelastic collision. As mentioned earlier, some of the initial kinetic energy is transformed into other forms of energy, such as heat or deformation. The total kinetic energy after the collision is generally less than the total kinetic energy before the collision.

d. Objects always stick together after an inelastic collision: In an inelastic collision, the objects involved may stick together or deform upon impact. However, it is not a universal rule that objects always stick together after an inelastic collision. The degree of stickiness or deformation depends on the specific properties of the objects and the nature of the collision.

Therefore, the correct conditions for an inelastic collision in a closed system are:

- Momentum is conserved.

- Objects may stick together or deform after the collision.

- One object may be stationary before the collision.

It's important to note that these conditions may vary depending on the specific scenario and the nature of the objects involved in the collision.

Learn more about Momentum  here :-

https://brainly.com/question/30677308

#SPJ11

Answer:

Energy is conserved.

Momentum is conserved

One object may be stationary before an inelastic collision.

Explanation:

Scalar quantities have magnitude only, while vector quantities have magnitude and direction. Scalars can be added algebraically, while vectors follow specific rules. Scalars have a single value, while vectors require representation with magnitude and direction.

Scalar quantities and vector quantities are two fundamental types of physical quantities used in physics. Here are five key differences between scalar and vector quantities:

1. Definition: Scalar quantities are defined by magnitude only, meaning they have a numerical value but no specific direction. Examples of scalars include time, temperature, mass, and speed. In contrast, vector quantities have both magnitude and direction. Examples of vectors include displacement, velocity, force, and acceleration.

2. Representation: Scalar quantities are represented by a single numerical value or variable, often accompanied by appropriate units. For instance, temperature can be represented by a value like 25 degrees Celsius. Vector quantities, on the other hand, require a representation that includes both magnitude and direction. This can be achieved using vectors or by using a combination of numerical values and angles.

3. Addition and Subtraction: Scalar quantities can be added or subtracted algebraically by simply considering their numerical values. For example, adding two temperatures of 10 degrees Celsius and 15 degrees Celsius gives a result of 25 degrees Celsius. In contrast, vector quantities follow different rules for addition and subtraction. Vector addition involves considering both the magnitude and direction of the vectors, using methods such as the parallelogram law or the triangle law.

4. Algebraic Operations: Scalar quantities can undergo all basic algebraic operations, such as multiplication, division, addition, and subtraction. These operations apply only to the numerical values of the scalars. Vector quantities, however, have additional operations specific to vectors, including dot product and cross product, which involve both the magnitude and direction of the vectors.

5. Physical Interpretation: Scalar quantities represent quantities that can be fully described by a single value, such as the magnitude of a quantity. For example, the speed of an object is a scalar that represents the magnitude of its velocity. Vector quantities, on the other hand, have physical interpretations that involve both magnitude and direction. For instance, displacement represents both the distance and the direction from the starting point to the endpoint.

In summary, scalar quantities have magnitude only, while vector quantities have both magnitude and direction. Scalars are represented by single numerical values, while vectors require representation with both magnitude and direction. Scalar quantities can be algebraically added or subtracted, whereas vector quantities follow specific rules for vector addition and subtraction. Scalars can undergo all basic algebraic operations, while vectors have additional vector-specific operations. Scalar quantities represent fully describable quantities, while vector quantities require consideration of both magnitude and direction for a complete description.

For more such information on: Scalar quantities

https://brainly.com/question/11261643

#SPJ8

The velocity of the canoe is  1.7 m/s.

Momentum in physics is the products of mass and velocity. Now we have to find momentum with the formula; p = mv

a) Initial momentum = (15)8 m/s + 135 = 255 Kgms-1

b) Since momentum is conserved, the total momentum after throwing the anchor is still 255 Kgms-1

c) The final velocity of the boat is obtained from;

255 Kgms-1 = (15Kg + 135 Kg) v

v = 255 Kgms-1/(15Kg + 135 Kg)

v = 1.7 m/s

Learn more about momentum: https://brainly.com/question/904448

The correct answer is D) Before the mechanic left, the molecules were moving in place. When she returned, they were moving around each other. The change in phase from solid to liquid is due to a change in the motion of molecules.

Molecules are formed when two or more atoms come together and form a chemical bond. Molecules exist in all forms of matter and are the building blocks of all living organisms. Molecules can range in size from the very small, such as hydrogen, to the very large, such as proteins. Generally, molecules are composed of two or more atoms of the same element or different elements that are held together by chemical bonds. Molecules can also be composed of multiple subatomic particles, such as protons and neutrons, which form the nucleus of an atom. Molecules may also contain electrons, which are held in orbit around the nucleus by electrostatic forces. Molecules can have different shapes depending on the arrangement of their constituent atoms. Molecules are essential to all forms of life, as they are responsible for many of the physical and chemical processes that take place in living organisms.

To learn more about molecules
https://brainly.com/question/23080116
#SPJ1

Answer:

If a rubber balloon is charged negatively (perhaps by rubbing it with animal fur) and brought near the spheres, electrons within the two-sphere system will be induced to move away from the balloon. This is simply the principle that like charges repel.

Explanation:

plz follow me and mark me as brainlliest

Plant cell: Plant cells are typically rectangular or square in shape, with a thick cell wall surrounding the cell membrane. They have a large central vacuole that stores water and nutrients. They also have chloroplasts, which are used for photosynthesis.

Animal cell: Animal cells are typically round or irregular in shape, with a thinner cell membrane surrounding the cell.

Bacteria cell: Bacteria cells are typically small and vary in shape. They can be rod-shaped (bacillus), spherical (coccus), or spiral (spirillum) in shape. They are typically smaller than plant and animal cells and can be found everywhere.

A cell is the basic unit of life in all organisms. It is the smallest unit of an organism that can carry out all the functions of life. All living things are made up of one or more cells. Cells come in many different shapes and sizes, and they have a variety of functions.

Plant cells also have a cell wall, which provides support and protection for the cell. They also have chloroplasts, which are responsible for photosynthesis, the process of converting light energy into chemical energy. Animal cells do not have a cell wall and do not have chloroplasts.

In all, Each type of cell has unique characteristics that allow it to perform its specific functions.

Learn more about Plant cell from

https://brainly.com/question/913732

#SPJ1

The answer is option (a)"decreases its energy" as doubling the momentum of a neutron leads to a decrease in its energy.

The de Broglie wavelength equation is given by λ = h/p, where λ is the wavelength of a particle, h is the Planck constant, and p is the momentum of the particle. This equation shows that the wavelength of a particle is inversely proportional to its momentum.

Therefore, if the momentum of a neutron is doubled, its wavelength will be halved (option (d) in the question).

However, the energy of a neutron is proportional to the square of its momentum, i.e., E = p\(^2/2m\), where E is the energy of the neutron, and m is its mass.

Therefore, if the momentum of a neutron is doubled, its energy will be quadrupled (not listed in the options).

Thus, option (a) "decreases its energy" is the correct answer.

Learn more about wavelength

brainly.com/question/31143857

#SPJ11

When a ferromagnetic material is placed in an electromagnetic coil and a magnetic field is applied, the magnetic induction (B) is increased.

Therefore, the correct answer is:

(a) There is a large increase in the magnetic induction (B)

For more such questions on Ferromagnetic materials, click on:

https://brainly.com/question/10394567

#SPJ8

Answer:

gravity

Explanation:

gravity pulls you down so for example you will weigh more on earth than on the moon because earths gravitational pull is greater.

Answer:

Explanation:

Newton's second law allows us to find the results for the questions about the forces in the motion of the ball are:

     a) The cable tension is: T = 1955 N

     b) The force to stop the ball is: F = 5520 N

Newton's second law gives a relationship between force, mass and acceleration of bodies.

        F = ma

The bold letters indicate vectors, F is the force, m the mass and the acceleration of the body.

The ball is oscillating therefore its movement is circular, in the lower part of the trajectory the centripetal acceleration is:

a) A free body diagram is a diagram of the forces without the details of the body, in the attachment we can see a free body diagram of the system.

          T - W = ma

           T = W + ma

We substitute.

          T = m (g + v ^ 2 / r)

Let's calculate.

          T = 115 (9.8 + 12 ^ 2/20)

           T = 1955 N

b) To find the average force, let's find the average acceleration to stop with kinematics.

             v² = v₀² - 2 a x

When the ball moves, its velocity is zero.

Let's calculate.

           a = 48 m /s²

We substitute in Newton's second law.

            F = m a

            F = 115 48

           F = 5520 N

In conclusion using Newton's second law we can find the results for the questions about the forces in the motion of the ball are:

      a) The cable tension is: T = 1955 N

      b) The force to stop the ball is: F = 5520 N

Learn more about Newton's second law here: brainly.com/question/8898885

active attachment

They do not transmit sufficient energy to kill cancer cells.  Longer wavelengths than visible light define infrared waves (IR), a kind of electromagnetic radiation.

The electromagnetic radiation known as infrared, also referred to as infrared light, has wavelengths that are longer than those of visible light and shorter than those of radio waves. Wavelength range and sources: between 780 nm and 1 mm. Infrared radiation (IR), commonly referred to as heat radiation, is that region of the electromagnetic spectrum with wavelengths above red visible light, between 780 nm and 1 mm. IR can be divided into three groups: IR-A (780 nm-1.4 m), IR-B (1.4-3 m), and IR-C, commonly known as far-IR (3 m-1 mm).

IR wavelengths range from 700 nanometers (frequency 430 THz), which corresponds to the visible spectrum's notional red edge, to 1 millimeter (300 GHz). Long-term IR exposure, according to medical studies, can harm the lens, cornea, and retina, causing cataracts, corneal ulcers, and retinal burns, respectively. Workers can use gear with IR filters or reflective coating to help prevent long-term IR exposure. Electrical warmers, food-cooking appliances, remote controls, optical fibres, security systems, and thermal imaging cameras that can see individuals in the dark all employ infrared (IR) light. whereas, gamma rays, which have the highest energy (and thus the most penetrating), for instance, have higher frequencies than infrared waves.Gamma rays are the electromagnetic waves with the highest energy, highest frequency (300 EHz), and shortest wavelengths (1 pm) (1,24 MeV) and are used in treating cancer.

To know more about the infrared rays, visit:

https://brainly.com/question/17029597

#SPJ1

The density of the solid metal object is 17.58 g/cm3.

The density (in g/cm3) of a solid metal object that has a volume of 1.24 cm3 and a mass of 21.8 g is 17.58 g/cm3 (rounded to two decimal places).

Explanation:

We know that density is the mass per unit volume of an object. Hence, to determine the density of a solid metal object, we divide the mass by the volume.

Using the formula: \[\text{Density} = \fraction{\text{Mass}}{\text{Volume}}\]Given that the volume of the object is 1.24 cm3 and the mass is 21.8 g, we substitute the values into the formula: \[\text{Density} = \fraction{21.8 \text{ g}}{1.24 \text{ cm}^3}\]Dividing the numerator by the denominator, we get: \[\text{Density} = 17.58 \fraction{\text{g}}{\text{cm}^3}\]

Therefore, the density of the solid metal object is 17.58 g/cm3.

to know more about metal visit :

https://brainly.com/question/29766835

#SPJ11

Answer:

C

Explanation:

Given that a note has a wavelength of 0.65551 m. If the speed of sound is 343.00 m/s, the pitch of the note is the same as the frequency.

Sound Velocity = product of frequency and wavelength.

Substitute wave speed and wavelength into the formula

343 = f × 0.65551

Make f the subject of formula

F = 343 / 0.65551

F = 523.58 Henz

Therefore, the pitch of the note is 523.52 Hz approximately

The correct answer is option C

Answer:

approximately 5.76 × 10^−7 meters, or 576 nanometers

Explanation:

The location of bright fringes in a double slit experiment is given by the formula:

d * sin(θ) = m * λ

where:

d is the slit separation,

θ is the angle at which the fringe occurs,

m is the order of the fringe (m = 0 for the central maximum, m = 1 for the first bright fringe, m = 2 for the second bright fringe, and so on), and

λ is the wavelength of the light.

We're looking for the wavelength of the light, and we're given that d = 2.02 × 10^−6 m, θ = 16.5°, and m = 1 (since we're looking at the first bright fringe).

Rearranging the formula to solve for λ gives us:

λ = d * sin(θ) / m

We need to make sure that we're working in radians, as that's what the trigonometric functions in most programming and calculation tools expect. There are π radians in 180 degrees, so to convert from degrees to radians, we multiply by π/180. This gives us θ = 16.5° * π/180 = 0.2873 radians.

Substituting the given values into the formula gives us:

λ = (2.02 × 10^−6 m) * sin(0.2873) / 1

λ ≈ 5.76 * 10^-7 m

So the wavelength of the light is approximately 5.76 × 10^−7 meters, or 576 nanometers (since 1 m = 10^9 nm).

The elevator's speed 4.8 s after starting is 44.47 m/s.

The elevator's speed 4.8 s after starting can be found using the formula: v = a*t [Where v is the velocity, a is the acceleration, and t is the time]

First, we need to find the acceleration of the elevator. We can do this by using the formula:  F = m*a [Where F is the force, m is the mass, and a is the acceleration]

For the first 2.4 s, the scale reads 830 N. This means that the force on Henry is 830 N. We can plug this into the formula and solve for a:

830 N = 95 kg*a

a = 8.74 m/s^2

For the next 2.4 s, the scale reads 930 N. This means that the force on Henry is 930 N. We can plug this into the formula and solve for a:

930 N = 95 kg*a

a = 9.79 m/s^2

Now, we can find the average acceleration by adding the two accelerations and dividing by 2:

a = (8.74 m/s^2 + 9.79 m/s^2)/2

a = 9.265 m/s^2

Finally, we can plug this into the formula for velocity and solve for v:

v = a*t

v = 9.265 m/s^2*4.8 s

v = 44.47 m/s

To know more about speed here:

https://brainly.com/question/28224010#

#SPJ11

Answer:

b

Explanation:

Answer:

The first box, second box, and fourth box are correct. I think the fifth might be correct...not completley sure about the fifth box.

Explanation: