A come-along, used to pull heavy loads horizontally over the ground for short distances, is also called a

Answer:

The question does not state how the answer is to be entered. I would use 10% because that is most common.

Explanation:

You are using 300 J of energy to get 30 J of light energy. The fact that you can account for the left over energy is not relevant.

Efficiency = Work Out / Work In

Efficiency = 30 J / 300 J  = 0.1

If you need this as a %, you can multiply by 100

Efficiency = 0.1 * 100 = 10%

Answer:

an elevator stopping on the third floor

Explanation:

The example that best represent balanced force as regards this question is an elevator stopped on the third floor.

Examples of balanced forces are;

Therefore option A is correct, because balanced force exist as the elevator stopped.

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Answer:

at the center of the galaxy

Explanation:

as there r more new born stars found

Answer:

Below are some of the important dates that led to the creation of the Constitution: 1775 — The Revolutionary War between the Colonies and Britain begins. ... 1781 — The last battle of the Revolutionary War takes place; the 13 states set up a federal government under laws called the Articles of Confederation.

Explanation:

please give me a heart

The surface is colder but the luminosity is higher than when the star was in the main sequence. Because The star grows. The surface may get colder as a result of spreading the radiation across a broader area. Option A is Correct.

Helium is converted into carbon inside of red giant stars while hydrogen is converted into helium outside of the core. The outward force produced by fusion starts to decline after a star's supply of hydrogen in its core is depleted, leaving only helium, and the star is unable to maintain equilibrium.

Bigger stars experience an inward collapse of their outer layers until the temperature is high enough to fuse helium into carbon. After then, the star grows many times beyond its initial size due to the pressure of fusion, becoming a red giant. Option A is Correct.

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Correct Question:

Red giant stars burn helium into carbon in the core and hydrogen into helium outside it. This produces more luminosity than when the star was on the main sequence, but the surface is cooler. Why is this?

A. The star expands. Spreading the radiation over the larger surface, the surface can be cooler.

B. The peak wavelength of a black body shifts to longer wavelengths when the body get more luminous.

C. The extra energy is used up expanding the star.

Answer: The image formed by a plane mirror is always virtual (meaning that the light rays do not come from the image), upright and of the same shape and size as the object it is reflecting.

Answer: B. The angle when it leaves is the same as the angle when it hits

Explanation:

Apex

Answer:

Explanation:

The strength of the force of friction depends on two factors: how hard the surfaces push together and the types of surfaces involved. What factors affect the gravitational force between two objects? Two factors affect the gravitational attraction between objects: mass and distance.

The capacitor is fully charged, no current flows through it. As a result, the current I1 out of the battery is 0 A.

Option E 0.0 A is the correct option.

Explanation:

What is a capacitor?

A capacitor is a passive electronic component that stores energy in an electric field. Capacitors are commonly used in electronic circuits as energy storage devices because they are able to charge and discharge quickly.

What is a circuit?

An electric circuit is a path through which electric current flows in order to achieve a desired outcome. The given circuit consists of a 12 V battery, a 6 Ω resistor, and a 12 μF capacitor. When the capacitor in this circuit is fully charged, the voltage across the capacitor (Vc) is equal to the voltage of the battery (Vb).

From Ohm's law, I = V/RI = 12/6I = 2 A  

The current flowing through the resistor is 2 A.

Since the capacitor is fully charged, no current flows through it. As a result, the current I1 out of the battery is 0 A. Option E 0.0 A is the correct option.

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Answer:

Equivalent

A conversion factor is a ratio of equivalent measures

Answer:

please help

Explanation:

Answer: The infra red waves is located between microwave and visible light based on their WAVELENGTH and FREQUENCY of occurrence.

Explanation:

Electromagnetic waves are those waves that do not require or need a material medium for its propagation, but they are able to travel through a vacuum. They exhibit or show all properties associated or connected with light. They are undeflected in electric and magnetic fields. These electromagnetic waves are arranged in order of their FREQUENCY and WAVELENGTHS which is known as ELECTROMAGNETIC SPECTRUM.

FREQUENCY is defined as the number of cycles which the wave completes in one second and is measured in Hertz(Hz). While WAVELENGTH is defined as the distance between two successive crests or troughs of waves which is measured in meter (m).

The electromagnetic spectrum is made up of the following rays which is arranged from the biggest wavelengths to the smallest:

--> Radiowaves

--> microwave :

--> infrared rays:

--> visible light:

--> ultraviolet rays

--> x-rays and

--> Gamma rays.

According to the arrangement of the spectrum above, the microwave has a higher wavelength and frequency than the infrared rays, while the visible light has a lower wavelength and frequency than the infrared rays.

The average velocity of the object in the first 5 seconds is 4 m/s.

The average velocity of an object can e defined as the average of the velocities of the object throughout its motion.

Average velocity can also be defined as the ratio of the total displacement of the object and the total time taken.

Considering the given object:

total displacement in the first 5 seconds = 40 m

time taken = 5 seconds

Average velocity = 40 m / 5 seconds

Average velocity = 4 m/s

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Answer:

The value in m/s \(v_{a} = 111 \ m/s \)

The value in km/h \(v_{a} = 400\ km/h \)

Explanation:

Generally the average velocity of the helicopter is mathematically represented as

\(v_{a} = \frac{\Delta D}{ t}\)

substituting \(3.33 km = 33.3*10^3\ for\  \Delta D\) and  30.0 s for  t

We have

         \(v_{a} =  \frac{33.3 *10^{3}}{ 30}\)

=>     \(v_{a} =  111 \  m/s \)

Now converting to km/h

      \(v_{a} =  111  *  \frac{3600  *\frac{s}{h} }{1*10^{-3} *\frac{km}{m}} \)

=>  \(v_{a} = 400\  km/h \)

Acid rain is the result of pollutants being released into the air

Acid rain is defined as rain or any other type of precipitation that is unusually acidic, which means it contains a lot of hydrogen ions. Acid rain has a pH level that is lower than this and typically ranges from 4-5. Most water, including drinking water, has a neutral pH that exists between 6.5 and 8.5.

When gases like sulphur dioxide and nitrogen oxides are released into the atmosphere, a chemical reaction takes place that eventually results in acid rain. These substances have the capacity to ascend to extremely high altitudes in the atmosphere, where they combine and interact with oxygen, water, and other chemicals to create acid rain, a type of ozone-depleting haze.

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The water bottle  has given out thermal energy of 168000 Joule.

By virtue of its temperature, a system is in a state of thermodynamic equilibrium, which contains thermal energy.

Unlike the energy of systems that are not in a state of thermodynamic equilibrium, thermal energy cannot be transformed into meaningful work as quickly.

The water bottle  has given out thermal energy = mass of the water × specific heat capacity of water × change in temperature

= 0.8 kg × 4200 J/kg-°C × (80° C - 30° C)

= 168000 Joule.

So, the water bottle  has given out energy of 168000 Joule.

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Answer:

The correct choice is 8o.

Explanation:

The given weight is hanging at the mid point of the rope and the buildings are at the same level, Obtain the given equation by equating the vertical components of force,

2Tsin(φ)=W

where φ is the angle made by rope with the horizontal.

Given T=1800 N and W=500 N, the value of φ is calculated as follows,

2*1800*sin(φ)=500

sin(φ)=0.1388

φ=7.90

φ≈8o

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The slope of the graph of the equation at the point (20, 2) is 1/8.

To find the slope of the graph of the equation at the given point (20, 2), we need to find the derivative of the equation with respect to x and evaluate it at x = 20. Let's differentiate the equation implicitly:

xy - 9y^2 = 4

To differentiate implicitly, we treat y as a function of x and apply the chain rule. Differentiating both sides of the equation with respect to x:

1 * y + x * dy/dx - 9 * 2y * dy/dx = 0

Simplifying this equation:

y + x * dy/dx - 18y * dy/dx = 0

Grouping the terms with dy/dx:

dy/dx * (x - 18y) = -y

Now, let's solve for dy/dx by dividing both sides by (x - 18y):

dy/dx = -y / (x - 18y)

Substituting the given point (20, 2) into the equation:

dy/dx = -2 / (20 - 18(2))

         = -2 / (20 - 36)

         = -2 / (-16)

         = 1/8

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6 feet deep is a fathom .

What is fathom ?

A fathom is a unit of length that is used primarily to measure the depth of water in nautical and maritime applications. It is equivalent to 6 feet (1.83 meters) and is used to describe the depth of water in terms of the distance from the surface of the water to the ocean floor.

The word "fathom" comes from the Old English word "fæðm," which means "the outstretched arms." The term was used to describe the length of a human outstretched arms, which was approximately 6 feet.

In nautical and maritime applications, fathoms are used to measure the depth of water in harbors, shipping lanes, and other areas where ships and boats operate. This information is important for navigation, as it helps sailors and mariners to avoid shallow waters and potential hazards.

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To determine the approximate voltage at point D, we need to consider the behavior of the diodes. Assuming the diodes are silicon with a forward bias voltage of 0.7 volts, we can analyze the circuit.

Since V1 is 8 volts, the positive terminal of the source will be at a higher potential than the negative terminal. In this case, D1 will be forward-biased as its anode is at a higher potential than its cathode. The forward-biased diode will allow current to flow through it, causing a voltage drop of approximately 0.7 volts across it. As a result, the voltage at point D will be approximately 8 - 0.7 = 7.3 volts.

Therefore, the approximate voltage at point D is 7.3 volts.

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Answer:

Explanation:

The series circuit is the one in which the current flowing through each bulb will be the same as the current at point x.

When bulbs are connected in series, the bulbs are connected in an end to end manner. The same current flows through all the bulbs when they are connected in series.

As such, the series circuit is the one in which the current flowing through each bulb will be the same as the current at point x.

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The average temperature of the coffee during the first 16 minutes is approximately 68.79°C.

Step 1:

The average temperature of the coffee during the first 16 minutes is calculated by finding the average of the temperature function T(t)=23+69\(e^(^-^t^/^5^3^)\) over the interval [0, 16].

Step 2:

To find the average temperature, we need to calculate the definite integral of the temperature function T(t) over the interval [0, 16] and divide it by the length of the interval.

The integral of T(t) can be found using the power rule of integration, which states that the integral of \(e^x\) is equal to \(e^x\) divided by the derivative of the exponent. In this case, the derivative of -t/53 is -1/53. So, the integral of T(t) becomes:

∫[0, 16] T(t) dt = ∫[0, 16] (23 + 69\(e^(^-^t^/^5^3^)\)) dt

                   = 23t - 69(53)\(e^(^-^t^/^5^3^)\) |_0^16

                   = 23(16) - 69(53)e^(-16/53) - (23(0) - 69(53)\(e^(^0^/^5^3^t^)\))

                   = 368 - 69(53)\(e^(^-^1^6^/^5^3^)\) + 0 - 69(53)

Next, we divide this integral by the length of the interval, which is 16 - 0 = 16:

Average temperature = (1/16) * (∫[0, 16] T(t) dt)

                            = (1/16) * (368 - 69(53)\(e^(^-^1^6^/^5^3^)\) - 69(53))

                            ≈ 68.79°C

Therefore, the average temperature of the coffee during the first 16 minutes is approximately 68.79°C.

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The test section's pressure is lower than the ambient pressure.

In the physical sciences, pressure is defined as the perpendicular force per unit area or the stress at a particular location within a confined fluid.

Given,

Diameter of Test section, d₂ = 0.5m

Area, A₂ = π/4d₂² = π/4×0.5² = 0.19635m²

Now, At Inlet,

Po = 101325Pa

To = 288 k

s = 122 kg/m³

(a) Using Bernoulli Theorem, i'n Test Section,

Po = \(P_{t}\) +1/2γ \(v_{t^{2} }\)

101325 = \(P_{t}\) + ½ (1.22) (200) ²

\(P_{t}\) = 76925 Pa

[\(v_{t}\) = 200m/s]

Now,

Static Temperature, \(T_{t}\)

\(T_{0}\) = \(T_{t}\) +v²/2\(c_{p}\)

288 = \(T_{t}\) +200²/2×1005

\(T_{t}\) = 268.09k.

Thus,

\(M_{t}\) = \(v_{t}\)/\(\sqrt{\nu RT_{t} }\)

\(M_{t}\) = 200/1.4×287×268

\(M_{t}\)= 0.609

The test section's pressure is lower than the ambient pressure.

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Answer

  96mph

Explanation:

You are given "144 miles in 90 minutes" and what you need to figure out is "144 km in X hours." To go from 90 min to hours, you can do 90 min * 1hr/60min = 1.5 hrs or 144 km in 1.5 hrs or 144 km per 1.5 hours. 144/1.5 = 96.

The magnitude of the acceleration due to gravity on the surface of the moon, in terms of the acceleration due to gravity on the surface of the earth (g), is approximately 0.166g.

The acceleration due to gravity on the surface of a celestial body depends on its mass and radius. In this case, we are comparing the moon to the earth. Given that the moon has a mass roughly 81.3 times less than that of the earth and a radius roughly 3.67 times less than that of the earth, we can determine the magnitude of the acceleration due to gravity on the moon's surface relative to that on the earth's surface.

Using Newton's law of universal gravitation, the formula for the acceleration due to gravity (g) is given by g = GM/r², where G is the gravitational constant, M is the mass of the celestial body, and r is its radius. Since we are comparing the moon to the earth, we can write the equation for the moon's acceleration due to gravity (g_moon) as g_moon = GM_moon/r_moon² and for the earth's acceleration due to gravity (g_earth) as g_earth = GM_earth/r_earth².

Comparing the two equations, we can express the ratio of the acceleration due to gravity on the moon's surface to that on the earth's surface as g_moon/g_earth = (GM_moon/r_moon²)/(GM_earth/r_earth²). Simplifying the equation, we find g_moon/g_earth = (M_moon/M_earth)*(r_earth²/r_moon²).

Given that the mass of the moon (M_moon) is roughly 81.3 times less than that of the earth (M_earth), and the radius of the moon (r_moon) is roughly 3.67 times less than that of the earth (r_earth), we can substitute these values into the equation. Thus, g_moon/g_earth = (1/81.3)*(3.67²) = 0.166.

Therefore, the magnitude of the acceleration due to gravity on the surface of the moon, in terms of the acceleration due to gravity on the surface of the earth (g), is approximately 0.166g.

In this scenario, we compared the acceleration due to gravity on the moon's surface to that on the earth's surface. By utilizing Newton's law of universal gravitation and considering the mass and radius ratios between the moon and the earth, we derived the equation g_moon/g_earth = (M_moon/M_earth)*(r_earth²/r_moon²). Substituting the given values, we found that the magnitude of the acceleration due to gravity on the surface of the moon, in terms of the acceleration due to gravity on the surface of the earth (g), is approximately 0.166g.

This calculation highlights the significant difference in gravitational acceleration between the moon and the earth. The moon's lower mass and smaller radius result in a much weaker gravitational pull compared to the earth. Understanding the factors that influence gravitational acceleration and being able to compare it across different celestial bodies is essential in various fields, including astronomy and space exploration.

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The constant shape and volume of a wooden block is due to the fact that the particles that make up the block are held together by strong intermolecular forces.

Intermolecular refers to the interactions that occur between molecules. These interactions involve the sharing or transfer of electrons between molecules and are responsible for a wide range of chemical and physical properties. Intermolecular forces are relatively weaker than intramolecular forces, which exist between atoms within a molecule.

These forces prevent the particles from moving relative to each other and thus maintain the block's shape and volume. This is because the particles remain bound together, even when the block is subjected to pressure or force of any kind. The particles are unable to move in any direction as they are tightly held together, thus maintaining the shape and volume of the block.

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Answer:

Explanation: as,

v=f∧

v=200×10³×1.5×10³

v=2.7×10^7ms⁻¹

The velocity of the radio waves is 3 × 10⁸ ms⁻¹.

A radio station frequency = 200 KH

wavelength = 1.5 km

         Radio waves in the electromagnetic spectrum has the longest wavelength and it will always be below 300GHz. The radio waves can be generated with acceleration through some charged particles. Only through the transmitter via antenna the radio waves can gets transmitted. Radio waves can be used in all the electronic devices as mobile phones, radio communication, radars and navigations.

                               V = f λ

            Velocity,  v = ( 200 × 10³ ) × ( 1.5 × 10³ )

                               = ( 300 × 10⁶ )

                             v = 3 × 10⁸ ms⁻¹.

Hence, the velocity of the radio waves is 3 × 10⁸ ms⁻¹.

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Answer:

B

Explanation: