Which one of the following statements about the movement of an object with zero acceleration is true?
A) The object must be at rest.
B) The object may be slowing down.
C) The object may be in motion.
D) The object may be speeding up

Answer:An incandescent light bulb gives only energy of the system in the form of heat. ... The roof of a house is stable but it receives energy from the surroundings and transfers energy through it towards lower temperature side which includes no mass transfer. So, it is best considered as closed system.

Explanation:

80Sec or 1.33 min time taken by train to cross a bridge with a uniform speed of 36 kmph.

Given data,

length of bridge = 600m

length of train = 200m

Length of bridge + Length of train is the total distance travelled by train to cross the bridge.

So, 600+200 = 800m = 0.8km

Now, applying the formula for time,

\(time =\frac{distance}{speed}\)

\(time = \frac{0.8}{36}\)

time = 0.022hours

time in seconds= 0.022×60×60

time in seconds= 1.33×60

time in seconds= 80seconds

Therefore, 80Sec or 1.33 min time taken by train to cross a bridge with a uniform speed of 36 kmph.

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Answer:

hope this helps

Explanation:

Of the three phases of matter (gas, liquid, and solid), sound waves travel the slowest through gases, faster through liquids, and fastest through solids

so your answer would be B.

Answer:

C

Explanation:

The starting skill level of the physical activities included in a personal fitness program should be determined from other individuals' fitness programs is a statement which is not true. Everyone starts their personal fitness journey at a different level which should be regarded . A fitness test should be taken to determine where an individual should start their new lifestyle.

Answer:

C. I got it right :)

Explanation:

A polynomial in linear algebra that has the eigenvalues as roots and is invariant under matrix similarity is known as the characteristic polynomial of a square matrix.

Among its coefficients are the determinant and the trace of the matrix. The characteristic equation of the matrix A is det (A -  λI) = 0, and its roots (the values of  λ) are referred to as characteristic roots or eigenvalues. Also, it is well known that each square matrix has a unique equation.

The characteristic equation of the matrix A is det(A - λI) = 0. The roots of the characteristic equation are eigenvalues  λ of A. The equation (A- λ I)x = 0 has nonzero solutions that are associated eigenvectors of A.

At steady state, the response to a complex exponential (or sinusoid) at a specific frequency is the same complex exponential (or sinusoid), but its amplitude and phase depend on the system's frequency sensitivity at that frequency.

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To answer your question, I would need to see the circuit diagram. However, I can provide some general information.

When switch S is closed after being open for a long period of time, the initial current passing through S will depend on the circuit components such as resistors, capacitors, and/or inductors.

If the circuit consists of only resistors, you can use Ohm's Law (V = IR) to determine the current. If capacitors are present, they will initially behave as short circuits, and the current will be influenced by the time constant (τ = RC). For inductors, the initial current will be zero, as they oppose sudden changes in current, and it will increase according to the inductor's time constant (τ = L/R).
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Answer:

V = 192 kV

Explanation:

Given that,

Charge, \(q=6.4\times 10^{-6}\ C\)

Distance, r = 0.3 m

We need to find the electric potential at a distance of 0.3 m from a point charge. The formula for electric potential is given by :

\(V=\dfrac{kq}{r}\\\\V=\dfrac{9\times 10^9\times 6.4\times 10^{-6}}{0.3}\\\\V=192000\ V\\\\V=192\ kV\)

So, the required electric potential is 192 kV.

Answer:

D. the water's latent heat of vaporization is being pulled from the air.

Explanation:

A swamp cooler also generally referred to as the evaporative cooler is an electronic device that uses moisture to cool air. This simply means that, the electronic device works on the principle of evaporation of water to cool the surrounding air.

In swamp coolers, water absorbs large amount of warm air via the evaporative wet cooler pad, so as to evaporate and consequently cooling the air effectively and efficiently.

Swamp coolers are effective because the water's latent heat of vaporization is being pulled from the air.

The latent heat of vaporization can be defined as the energy that is being absorbed by water during evaporation.

The swamp coolers are typically made up of the following essential components, these are;

1. Float.

2. Blower.

3. Pump.

4. Evaporative pad.

5. Water supply valve.

Hence, through the principle of evaporative cooling (latent heat of vaporization), swamp coolers reduces or lower the air temperature in its surroundings.

Answer:

B and D

Explanation:

Answer:

Topaz

Explanation:

It's harder than garnet and comes in various colors

Answer:

garnet

Explanation:

The magnitude of the angular momentum of the rotating disk is approximately 0.0482 kg·m²/s. It is calculated using the formula L = I * ω, where I is the moment of inertia and ω is the angular velocity (converted to rad/s from 600 rpm).

Given:

Mass of the disk (m) = 2.90 kg

Diameter of the disk (d) = 5.70 cm = 0.057 m

Angular velocity (ω) = 600 rpm

Step 1: Calculate the moment of inertia (I)

Radius (r) = (1/2) * diameter = (1/2) * 0.057 m = 0.0285 m

Moment of inertia (I) = (1/4) * m * r^2

I = (1/4) * 2.90 kg * (0.0285 m)^2

I ≈ 0.000766 kg·m^2

Step 2: Convert angular velocity to rad/s

Angular velocity (ω) = 600 rpm * (2π rad/1 rev) * (1 min/60 s)

ω ≈ 62.83 rad/s

Step 3: Calculate the magnitude of the angular momentum (L)

Magnitude of angular momentum (L) = I * ω

L ≈ 0.000766 kg·m^2 * 62.83 rad/s

L ≈ 0.0482 kg·m^2/s

Therefore, the magnitude of the angular momentum of the 2.90 kg, 5.70-cm-diameter rotating disk is approximately 0.0482 kg·m^2/s.

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After analyzing the reported figures, it is clear that they are incorrect, and the stream analyses must be repeated. It is because the weight percentages of methanol, ethanol, and water in the original mixture are 25%, 42.5%, and 32.5%, respectively, and the sum of these percentages should equal 100%.

However, the sum of weight percentages of methanol and ethanol in the two product streams exceeds 100%. The sum of weight percentages of methanol and ethanol in both streams is greater than 100%, which is not possible because the original mixture contained only 25% methanol and 42.5% ethanol. If the reported figures are correct, the total weight percentage of methanol and ethanol in both streams would be (39.8% + 19.7%) + (31.5% + 41.2%) = 132.2%, which is impossible. Therefore, the reported figures must be incorrect, and the stream analyses should be repeated.

A technician must analyze both streams because the original mixture contained methanol and ethanol in different proportions. If only one stream is analyzed, it would not be possible to identify which stream contains a higher or lower percentage of methanol or ethanol compared to the original mixture.Hence, both product streams must be analyzed, and the weight percentages of methanol and ethanol in each stream should be determined. The results can be used to identify whether the process of separation was successful or not.

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ANSWER

EXPLANATION

We want to find out how wings help a plane to fly.

The wings of an airplane are there to help lift the plane. They are shaped to make air move faster over the wings.

They are used for lifting, landing, turning and controlling the airplane. The curve on the wings make the air move faster than the air at the bottom of the wings which appropriates Bernoulli's principle to push the plane into the air.

Answer:

3N to the right

Explanation:

The energy stored in a 2.60-cm-diameter, 14.0-cm-long solenoid that has 150 turns of wire and carries a current of 0.780 a is 0.016 joules.

The energy stored in a solenoid is given by the equation:

U = (1/2) * L * I²

where U is the energy stored, L is the inductance of the solenoid, and I is the current flowing through it.

The inductance of a solenoid can be calculated using the equation:

L = (μ * N² * A) / l

where μ is the permeability of the medium (in vacuum μ = 4π × 10⁻⁷ H/m), N is the number of turns of wire, A is the cross-sectional area of the solenoid, and l is the length of the solenoid.

First, let's calculate the inductance of the solenoid:

μ = 4π × 10⁻⁷ H/m

N = 150

A = πr² = π(0.013 m)² = 0.000530 m²

l = 0.14 m

L = (4π × 10⁻⁷ H/m * 150² * 0.000530 m²) / 0.14 m = 0.051 H

Now, we can calculate the energy stored in the solenoid:

I = 0.780 A

U = (1/2) * L * I^2 = (1/2) * 0.051 H * (0.780 A)² = 0.016 J

Therefore, the energy stored in the solenoid is 0.016 joules.

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Newton's optics experiment observation and intervention. In order to make his observations, Newton used the theory of light passing through prisms and the rays that were sent by them. It was revealed that light has a variety of properties and features.

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I added an image of the answers/ Hope this helps! good luck on it.

Answer:

large membrane enclosed structure

Capacitors store energy in a magnetic field, concentrated in the dielectric, the given statement is false because capacitors store energy in an electric field, not a magnetic field, which is concentrated in the dielectric.

A capacitor consists of two metal plates, with a gap between them, and a dielectric material between them. When a potential difference is applied across the plates, an electric field is created in the dielectric, causing charges to accumulate on the plates. The amount of charge that can be stored on the plates is proportional to the voltage and the capacitance of the capacitor.

The capacitance is determined by the size and spacing of the plates, as well as the properties of the dielectric. Capacitors are used in a variety of applications, including power supplies, filters, and timing circuits. They can also be used for energy storage in electronic devices, such as cameras and flashlights. In summary, the given statement is false because capacitors store energy in an electric field, which is concentrated in the dielectric.

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Answer:

star

Explanation:

because that is what our sun is.

Answer:

I believe it is D.

Explanation:

I say this because it is position vs. seconds and it makes the most sense based on the markings. Sorry if I am wrong, hope it is right!  

Answer: D. 40/15 = 2.67m/s

Explanation:

I hope it is correct

The production function will have constant returns to scale if 2αβ = 1

Constant returns to scale (CRS) implies that if all inputs increase by a factor of λ, the output increases by λ as well. The requirement for constant returns to scale (CRS) in a Cobb-Douglas production function with a new input factor is given by the sum of exponents on all variables equal to 1.

In this case, Y = AKαLβMγ.

Thus, we have that α + β + γ = 1 for constant returns to scale in K, L, and M, because the sum of the exponents is 1.

If the sum of the exponents is less than 1, it indicates decreasing returns to scale. If the sum of the exponents is greater than 1, it indicates increasing returns to scale. If we take γ = 0, we obtain the production function used in class, which is Y = AKαLβ, thus α + β = 1 for constant returns to scale in K and L.

When γ = 0, the answer we get is consistent with what we learned in class. Now, we consider the constant elasticity of substitution (CES) technology, where Y = [aKα + bLα]β. The production function will have constant returns to scale (CRS) in K and L if the sum of the exponents of K and L is equal to 1.

Therefore, αβ + αβ = 1, implying 2αβ = 1.

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The increase in volume reading when the brass block is placed in the cylinder is equal to the volume of liquid displaces by the object. This is defined by the Archimedes principle.

The upward buoyant force is exerted on an object when the object is fully or partially immersed in the fluid. The buoyancy force is equal to the weight of the fluid that the body displaces and this force always acts in the upward direction. This is called as Archimedes principle.

It states that the magnitude of buoyancy force exerted on the object by a liquid is equal to the weight of the volume of the liquid displaced by the object. When a brass block is immersed in the liquid, the level of water increases depending on the weight of the brass.

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Hydropower is the source of renewable energy that contributed the most to 12% of the electricity generated in the United States in 2012.

Hydropower, also known as hydroelectric power, is one of the earliest and most significant forms of renewable energy. It uses the water's natural flow to generate electricity. Currently, 32% of all renewable electricity produced in the US and around 12% of all electricity produced in the country comes from hydropower.

Energy that comes from sources that quickly replenish themselves is referred to as renewable energy. Most of the time, clean energy, or energy that emits few greenhouse gases or pollutants, is also provided by renewable energy sources.

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Answer:

32 m/s

Explanation:

The speed of a bus is 30 m/s due East wrt the passenger

He also sees a  passenger on the bus walking to the back at 2 m/s.

We need to find the passenger's velocity relative  to the bus. As the observer sees that the bus and the passenger are moving in opposite direction. Let v is the relative velocity. So,

v = 30 m/s + 2 m/s

v = 32 m/s

Hence, the passenger's velocity relative  to the bus is 32 m/s.

Answer: D  Medium B is denser than Medium A because light bends more in Medium B.

Explanation: The more the light bends the less energy it has

The linear velocity in terms of the angular velocity is,

where,

The angular velocity in terms of the linear frequency is,

Thus, the linear velocity in terms of linear frequency is,

The linear velocity in terms of the displacement and time is,

The relation given in the first option is the expression for centripetal acceleration.

Thus, option a is the correct answer.

the minimum coefficient of static friction between the wall and the rider required to prevent sliding is approximately 1.02.

To solve this problem, we can analyze the forces acting on the rider. When the floor drops, the only force providing a centripetal acceleration to the rider is the frictional force between the rider and the wall. The rider will experience a pseudo force outward due to the circular motion caused by the rotation of the room.

First, let's calculate the angular velocity of the circular room in radians per second:

Angular velocity = (45 rev/min) * (2π rad/rev) * (1 min/60 s) = 45 * 2π / 60 = π/2 rad/s

Next, let's calculate the acceleration experienced by the rider due to the circular motion. The centripetal acceleration can be calculated using the formula:

Centripetal acceleration = (angular velocity)^2 * radius

where the radius is half of the diameter:

Radius = 8.0 m / 2 = 4.0 m

Centripetal acceleration = (π/2 rad/s)^2 * 4.0 m = π^2 m/s^2

Since the frictional force provides the necessary centripetal acceleration, we can equate it to the product of the mass of the rider (m) and the centripetal acceleration:

Frictional force = m * centripetal acceleration

Now, let's consider the gravitational force acting on the rider. The rider's weight is given by:

Weight = m * g

where g is the acceleration due to gravity. To prevent the rider from sliding down the wall, the frictional force should be equal to or greater than the weight:

Frictional force ≥ Weight

m * centripetal acceleration ≥ m * g

Simplifying, we get:

centripetal acceleration ≥ g

Substituting the values:

π^2 m/s^2 ≥ 9.8 m/s^2

Now we can solve for the minimum coefficient of static friction (μ) using the equation:

μ = (centripetal acceleration) / g

μ = (π^2 m/s^2) / (9.8 m/s^2)

Calculating this expression, we find:

μ = π^2 / 9.8

≈ 1.02

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The thermal energy created when the crate slides at the given distance is 6,192.8 J.

The given parameters;

The thermal energy created is the energy lost due to friction and it is calculated as follows;

\(W = \mu F_n d\)

where;

\(\mu\) is the coefficient of friction

The coefficient of friction is calculated as;

\(\mu = tan(\theta)\\\\\mu = tan(35)\\\\\mu = 0.7\)

The work done against friction is calculated as;

\(W = \mu F_n d\\\\W = \mu (Wcos\theta ) d\\\\W = 0.7 \times 900 \times cos(35) \times 12\\\\W = 6,192.8 \ J\)

Thus, the thermal energy created when the crate slides at the given distance is 6,192.8 J.

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An unmagnetized piece of iron differs from a magnetized piece of iron primarily in their internal structure and magnetic properties. In an unmagnetized iron, the individual magnetic domains are randomly oriented, which means that their magnetic fields cancel each other out, resulting in no net magnetic field.

On the other hand, when the iron becomes magnetized, the magnetic domains align in the same direction, thereby creating a net magnetic field. This process is typically achieved through the application of an external magnetic field or by placing the iron piece in close proximity to a strong magnet. The alignment of the magnetic domains causes the magnetized iron to exhibit magnetic properties, such as attracting or repelling other magnetic materials and generating a magnetic field.

In terms of practical applications, magnetized iron can be used in a variety of devices, such as electromagnets, transformers, and magnetic storage media. Unmagnetized iron, while not possessing these magnetic properties, still retains its inherent characteristics, like strength and ductility, making it suitable for structural and engineering purposes.

In summary, the main difference between an unmagnetized and magnetized piece of iron lies in the orientation of their magnetic domains and the resulting presence or absence of a net magnetic field. This difference gives rise to distinct magnetic properties, which ultimately determine their specific applications in various industries.

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