Questions 1: The diagram below shows two 8-ohm resistors connected to a 12 volt battery. An
ammeter (A) measures the current in the circuit.
8.0 32 8.0 32
mw
12-volt
source
A
1. What is the equivalent resistance of the circuit?
A. O ohms
B. 16 ohms
C. 8 ohms
D. 4 ohms
Justification:

A force is an influence that has the power to alter an object's motion. A massed object's velocity can be changed or accelerated by a force. A force is a vector quantity since it has both magnitude and direction.

The mass of a physical body is a measure of its entire makeup. It also measures inertia, or the body's resistance to acceleration when a net force is applied. The strength of a body's gravitational pull on other bodies is also influenced by its mass. Kg is used as the fundamental mass unit.

Acceleration is the rate at which the velocity of an object modifies with respect to time. The direction of the net force acting on an object determines its acceleration.

As we know,

Force = mass x acceleration

Therefore, acceleration = force / mass

                                       = {(35 / 30) - (35 / 20)} kgN

                                       = 0.583 kgN towards right

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Answer:

Parallel Circuits

Explanation:

Loads can be operated on their own. If you had a series circuit, adding another light would dim the rest!

Answer:

Wear and tear of an object is not desirable as it reduces its life. This is more so in case of moving parts in automobiles and machinery. Therefore, efforts are made to reduce friction between moving parts. Friction between moving parts is usually reduced by introducing a substance between the moving surfaces.

Explanation:

Answer:

the benefit is that they can see and experiment on the model but some times the model isn't accurate resulting in immediate failure

im only 13 sorry if this is wrong i tried.

Answer: it’s 1,470 N

Explanation:

Since F=m*a then 150*9.8=1,470.

Weight of given cart is 1,470 N

Given that:

Mass of cart = 150 kg

Acceleration due to gravity = 9.8 m/s²

Find:

Weight of cart

Computation:

Weight = m × g

Weight of cart = Mass of cart × Acceleration due to gravity

Weight of cart = 150 × 9.8

Weight of cart = 1,470 N

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Answer:

waterproof and transmits light.

Answer:

waterproof and transmits light.

Explanation:

Answer:

B. Electron

Static charge is produced by electron transfer.

Explanation:

Answer A: The neutron does not possess a charge and is said to be neutral.

Answer D: Protons and neutrons never move from object to object.

Only negative charges can move freely from one object to another. The energy that comes from these charges particles is called electrical energy.

....

Hope this answer can help you.

The answer is an electron.

Answer:a

Explanation:

Now that we have the values for TH, TC, and QH, we can insert them into equation (1) to obtain QC=QH (TC/TH)=6.45kJ(300K/520K)=3.72kJ. A negative indication is proof that the heat leaves the engine.

When provided, When the Carnot engine was operating, the hot side temperature (TH) was 520 K, while the cold side temperature (TC) was 300 K.

The heat that the engine absorbed at the hot side is provided as QH = 6.45 kJ, and we are requested to calculate the heat that was discarded at the cool reservoir, QC.

​By knowing TH ,TC and QH

​we can get QC

using equation 20.13 in the form

QC =−QH (TC/​TH )

Now we can plug our given values for TH ,TC and QH into equation (1) to get QC

​QC=−QH (TC/TH)=−6.45kJ(300K/520K​ )= −3.72kJ

A negative indicator indicates that the engine is losing heat.

effectiveness is WQH=1TCTH. The efficiency of a Carnot engine with a hot reservoir of boiling water and a cold reservoir of freezing cold water, for instance, will be 1(273/373)=0.27, or little over 25% of the heat energy is converted into usable work. Of course, these temperatures are in degrees Kelvin.

the operating fluid's maximum and minimum temperatures at full power. Construct the equations while assuming that the Carnot efficiency is 1 TC/TH. [0.75; 0; 0.5; 100; 1000 K; 500 K] P6.2.

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Answer:

The answer should be: 1.20 A

Explanation:

Answer:

It blocks some light, but not all.

Explanation:

The point of polarization is to get the light to travel in a single plane. The light waves occur in a single plane. The direction of the vibration of the waves is the same. With two polarized filters, it is possible to block out nearly all the light.

Answer:

A lunar eclipse occurs when the Moon moves into the Earth's shadow. ... The only light reflected from the lunar surface has been refracted by Earth's atmosphere. This light appears reddish for the same reason that a sunset or sunrise does: the Rayleigh scattering of bluer light.

Lunar eclipses can only happen when the Moon is opposite the Sun in the sky, a monthly occurrence we know as a full Moon. But lunar eclipses do not occur every month because the Moon's orbit is tilted five degrees from Earth's orbit around the Sun. Without the tilt, lunar eclipses would occur every month.

Explanation:

Given that the number of hailstones is n = 562

The mass of hailstone is m = 2 g = 0.002 kg

The speed of hailstone is v = 5.8 m/s

The time taken will be t = 92 s

The angle is

We have to calculate the force.

The force can be calculated by the formula

Substituting the values, the force will be

T=30.4N. This solution has explained Newton's Second Law, the concept of tension and the required steps have been provided to calculate the tension force.

The concept of Newton's laws of motion. What is Newton's Second Law? Newton's second law is a crucial law of motion. It helps to explain how an object accelerates when the resultant force acts on it. The law states that the acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to its mass. The acceleration of the object is given by F = ma, where F is the net force acting on the object, m is the mass of the object, and a is the acceleration of the object.

What is tension? Tension is a term used in physics and engineering to describe the force applied through a rope, cable, or wire. A tension force is exerted by a string or a rope that is pulled tight from both ends and can be calculated using the following formula: Tension force = weight of the object in the direction of the force + force required to overcome friction From the given data, Weight of the box, w = 15.3 N Force applied to move the box,

F = 30.4 NH

The force required to overcome the friction = F - w = 30.4

15.3 = 15.1 N

Since the string is pulling the box in the opposite direction to the force of friction, we need to consider the net force acting on the box.

Net force, F

net = F

force of friction = 30.4 15.1 15.3 N Using Newton's second law, we get

F net = ma

15.3 = 2.5a

Solving for a, we geta = 15.3/2.5, 6.12 m/s²

Since the tension in the string is the same as the force required to move the box, we have:

Tension force = force required to move the box = F = 30.4 N

Therefore, the tension in the string once the box begins to move is 30.4 N (to two significant figures).

The tension in the string once the box begins to move is 30.4 N.

Therefore, the correct answer is T=30.4N. This solution has explained Newton's Second Law, the concept of tension and the required steps have been provided to calculate the tension force. The calculations have been shown step-by-step to get a clear understanding of the solution.

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The three kinds of spectra can be used to determine different physical properties of the emitting matter.

Three kinds of spectrums :

1. Continuous spectrum: This type of spectrum is produced by a hot,          dense matter, such as a solid or dense gas.

It displays a range of wavelengths or colors without any gaps.

The physical property that can be determined using a continuous spectrum is the temperature of the emitting matter.

analyzing the peak wavelength and the distribution of energy, you can        calculate the temperature using Wien's Law.

2. Emission spectrum: This spectrum is produced by hot, low-density   gas.

It displays bright, distinct lines at specific wavelengths, which correspond to the energy levels of the emitting atoms.

The physical property that can be determined using an emission spectrum is the chemical composition of the emitting matter.

Each element has a unique set of emission lines, so you can identify the elements present in the matter by comparing its emission lines to known reference spectra.

3. Absorption spectrum: This spectrum is produced when light passes through a cooler, low-density gas, and the gas absorbs specific wavelengths, leaving dark lines at those positions.

The physical property that can be determined using an absorption spectrum is the chemical composition of the absorbing matter, similar to the emission spectrum.

By comparing the absorption lines to known reference spectra, you can identify the elements present in the matter.

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In the case where the period is 2.2 x 104 s, the rotational speed is given by 1 / 2.2 x 104 = 4.55 x 10-5 rad/s. Utilizing the equation v = r, we can find the tangential speed. in which the rotating speed is

The linear or tangential speed is denoted by v.

r stands for radius. The result is that v = 4.55x10-5(1.8x108), or 5.1 x 104 m/s.

To refer to the item or person that is the target of an action, we typically use the word "object." Alternatively, the recipient. In a sentence, a verb's action is transferred to a noun or pronoun as a direct object. Usually, it responds to the inquiries what or whom. relating to the verb.

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Answer:

v =2.02

Explanation:

v^2=0.05-4.9

v^2=-4.85

square root both side

v=2.02

^^^^this is a not a perfect square  

H everywhere is 20π p A/m in the azimuthal direction, where p is the radial coordinate in cylindrical coordinates.

The integral form of Ampere's Law relates the magnetic field H to the current passing through a closed loop. In cylindrical coordinates, the current density is given by J(r, θ, z) = N·P(r)·uϕ(θ), where N is the number of turns per unit length, P(r) is the volume current density, and uϕ(θ) is the unit vector in the azimuthal direction.

To find H everywhere, we consider a closed loop in the azimuthal direction (ϕ) at a fixed radial distance p. Along this loop, the length element dl is in the azimuthal direction, and the magnetic field H is also in the azimuthal direction.

Applying Ampere's Law, the integral of H·dl over the closed loop equals μ0 times the total current enclosed by the loop. Since the current is uniform and flowing in the azimuthal direction, the total current enclosed is J·2πp, where J is the volume current density and 2πp is the path length along the loop at radial distance p.

Setting up the integral and solving, we have:

H·2πp = μ0·J·2πp

H = μ0·J = μ0·N·P(r) = 20πp A/m.

Therefore, H everywhere in the azimuthal direction is given by H = 20πp A/m.

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Iron has strong ferromagnetic properties and that is why it is used as core in electromagnets. However, iron can easily be demagnetized but steel cannot. Steel forms permanent magnet.

An electromagnet is a material which can form a magnetic field in the presence of an electric field. The magnetic field strength depends on the nature of the material as well the strength of the electric field.

Iron is a metal exhibiting strong ferromagnetic properties. The magnetic field lines can align along the applied field and it can be lost when the applied field is removed.

Therefore, iron can be demagnetized when the switch is off. If we use steel instead it would be very difficult to demagnetize and will form a permanent magnet.

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The time taken for the coffee to cool from 93°C to 73°C is approximately 36.1 minutes.

The cooling law is given by:

$$\frac{dQ}{dt}=-k(T-T_0)$$

where Q is the heat in the object, t is the time taken, T is the temperature of the object at time t, T0 is the temperature of the environment and k is a constant known as the cooling constant.

We need to find the time it takes for the coffee to reach a drinking temperature of 73°C given that its initial temperature is 93°C.

Therefore, we need to find the time it takes for the coffee to cool down from 93°C to 73°C when placed in a room temperature of 18°C.

Let’s assume that the heat energy that is lost by the coffee is equal to the heat energy gained by the environment. We can express this as:

dQ = - dQ where dQ is the heat energy gained by the environment.

We can substitute dQ with C(T-T0) where C is the specific heat capacity of the object.

We can rearrange the equation as follows:

$$-\frac{dQ}{dt}=k(T-T_0)$$

$$-\frac{d}{dt}C(T-T_0)=k(T-T_0)$$

$$\frac{d}{dt}T=-k(T-T_0)$$

The differential equation above can be solved using separation of variables as follows:

$$\frac{d}{dt}\ln(T-T_0)=-k$$

$$\ln(T-T_0)=-kt+c_1$$

$$T-T_0=e^{-kt+c_1}$$

$$T=T_0+Ce^{-kt}$$

where C = e^(c1).

We can now use the values given to find the specific value of C which is the temperature difference when t=0, that is, the temperature difference between the initial temperature of the coffee and the room temperature.

$$T=T_0+Ce^{-kt}$$

$$73=18+C\cdot e^{-0.09t}$$

$$55=C\cdot e^{-0.09t}$$

$$C=55e^{0.09t}$$

$$T=18+55e^{0.09t}$$

We can now solve for the value of t when T=93 as follows:

$$93=18+55e^{0.09t}$$

$$e^{0.09t}=\frac{93-18}{55}$$

$$e^{0.09t}=1.3636$$

$$t=\frac{\ln(1.3636)}{0.09}$$

Using a calculator, we can find that the time taken for the coffee to cool from 93°C to 73°C is approximately 36.1 minutes.

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Answer:

On an air hockey table, when the table is on, pucks glide freely when hit. When the table is off, pucks do not travel as far when hit. Explain in as much detail as you can why this occurs and what allows this to occur, using Newton’s 1st Law.

Newton's 1st Law, also known as the law of inertia, states that an object at rest will remain at rest, and an object in motion will remain in motion with a constant velocity unless acted upon by an unbalanced force.

In the case of an air hockey table, the air flow created by the table's motor serves as the unbalanced force that affects the movement of the puck. When the table is on, the motor creates a cushion of air that flows across the surface of the table, allowing the puck to glide freely with little resistance. This air flow reduces the friction between the puck and the table, allowing the puck to travel farther when hit.

However, when the table is turned off, there is no longer a cushion of air to reduce friction between the puck and the table. This increased friction slows down the puck more quickly, causing it to travel a shorter distance when hit. The puck is also more likely to come to a complete stop when it reaches the edges of the table, as the lack of air flow makes it more difficult for the puck to bounce off the table's walls.

In summary, the air flow created by the motor on an air hockey table serves as an unbalanced force that reduces friction and allows the puck to travel farther. Without this air flow, the increased friction between the puck and the table causes the puck to slow down more quickly, resulting in shorter travel distances and a higher likelihood of coming to a complete stop.

The final pressure of the gas is p2 = 2.085 * 10^5 pa.

Boyle's law is a gas law that states that the pressure exerted by a gas (of a given mass at a constant temperature) is inversely proportional to the volume it occupies. That is, if the temperature and quantity of gas are constant, the pressure and volume of the gas are inversely proportional.

Boyle's Law states that a change in the volume occupied by a gas (at a constant amount and temperature) leads to a change in the pressure exerted by the gas. The following mathematical formulation of this law is possible:

P1V1 = P2V2

Given,

Initial Volume, v1 = 500 cm3

Final Volume, v2 = 240 cm3

Initial Pressure, p1 = 1.0 * 10^5 pa

Final Pressure, p2

We know that,

p1 v1 = p2 v2

1.0 * 10^5 * 500 = p2 * 240

p2 = 2.085 * 10^5 pa

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Answer:

With sonar, what happens to sound pulses from a ship after they hit the ocean floor? ... They bounce back to the ship.

Explanation:

The neutron star that pulses 600 times per second must have had its angular momentum changed by a binary companion.

Neutron stars that pulse are known as pulsars and their pulses are caused by their rotation. The rate of pulsation is directly related to the neutron star's angular momentum. A pulsar that pulses faster must have a smaller radius and higher angular velocity than a pulsar that pulses slower.

Therefore, a pulsar that pulses 600 times per second must have a very small radius and high angular velocity, which can only be achieved by a change in its angular momentum. The most likely cause of this change in angular momentum is a binary companion transferring angular momentum to the pulsar.

In conclusion, a neutron star that pulses 600 times per second is the one that must have had its angular momentum changed by a binary companion.

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Car B is moving 5 times as fast as car A, its kinetic energy will be 25 times greater. Therefore, to stop car B, 25 times more work would be needed compared to stopping car A.

The kinetic energy of an object is given by the formula:

KE = (1/2)mv^²,

where m is the mass of the object and v is its velocity.

Let's consider car A's velocity as v, and car B's velocity as 5v.

The kinetic energy of car A is KE_A

= (1/2)m(v^²)

The kinetic energy of car B is KE_B

= (1/2)m((5v)^²)

= 25(1/2)mv^²

= 25KE_A.

As we can see, car B has 25 times more kinetic energy than car A.

Since the work required to stop an object is directly proportional to its kinetic energy, it follows that stopping car B would require 25 times more work compared to stopping car A.

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Answer:

I believe it is True... I hope it is correct :)

Explanation:

Answer : False

Explanation :

Answer:

p =  17500 kg*m/s

Explanation:

p = mv

p = 35.0 kg * 500.0 m/s = 17500 kg*m/s

The momentum of a 35.0 kg cannonball fired from a cannon with a velocity of 500.0 m/s will be equal to 17500 \(\dfrac{kg.m}{s}\)

When any body which is having a mass and is in the motion carry momentum with it.

The formula for finding the momentum of any body is given by

\(Momentum = Mass\times Velocity\)

Given that-

\(Mass = 35 kg\)

\(Velocity = 500\)  \(\dfrac{m}{s}\)

\(Momentum = 35\times500\)

\(momentum= 17500 \dfrac{kg.m}{s}\)

Hence The momentum of a 35.0 kg cannonball fired from a cannon with a velocity of 500.0 m/s will be equal to 17500 \(\dfrac{kg.m}{s}\)

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Answer:

v=FX

v=34(2.0)

v=68m/s

The ratio of the rocket's initial mass to final mass is 1.595

Usng the rocket formula, for change in speed

Δv = v㏑(Mi/Mf) where

Given that a rocket's orbital maneuver requires a speed increase of 1.05 × 10³ m/s. If its engine has an exhaust speed of 2.25 × 10³ m/s,

So,

Making (Mi/Mf) subject of the formula, we have

(Mi/Mf) = exp(Δv/v)

So, substituting these into the equation for the rocket speed, we have

(Mi/Mf) = exp(Δv/v)

(Mi/Mf) = exp(1.05 × 10³ m/s/2.25 × 10³ m/s)

(Mi/Mf) = exp(0.467)

(Mi/Mf) = 1.595

So, the ratio of the rocket's initial mass to final mass is 1.595

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