12. A student has a set of masses to use in an experiment. Which mass has the greatest
inertia?
A. lg mass
B. 5g mass
C. 25g mass
P. 1000 mass

SMM2 refers to the Standard Method of Measurement 2. It is a document that specifies the method and processes used in measuring buildings and civil engineering works. SMM2 is commonly used in the construction industry.

The following are explanations of the clauses under Standard Method of Measurement 2 (SMM2):

i. D.10: This clause under SMM2 relates to the painting of metal and timber surfaces. It stipulates that when painting the surfaces of timber or metal, the preparation of surfaces and application of paint must conform to manufacturer specifications. It also specifies that the paint must be applied using a brush, roller, or spray. The clause then goes on to outline specific measurements for the thickness of paint coating to be applied on surfaces.

ii. D.12.4: This clause under SMM2 refers to the construction of walls using concrete blocks. It states that the concrete blocks used should have a minimum density of 1500 kg/m3. It also outlines specific measurements for the thickness of the mortar to be used for bonding the blocks together. The clause further specifies the measurement of the joint thickness between blocks.

iii. D.12.6: This clause under SMM2 refers to the rendering of walls with a cement mortar mix. It specifies that before rendering, the surface of the wall must be clean, dry, and free of debris. It also outlines specific measurements for the thickness of the rendering to be applied to the wall. The clause then stipulates that the rendering should be finished with a smooth surface that conforms to the architect's specifications.

iv. D.12.8: This clause under SMM2 refers to the painting of interior plastered walls. It stipulates that the preparation of surfaces and application of paint must conform to manufacturer specifications. It also specifies that the paint must be applied using a brush, roller, or spray. The clause then goes on to outline specific measurements for the thickness of paint coating to be applied on surfaces.

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Thesis: The flu (influenza), COVID-19, and respiratory syncytial virus (RSV) are three contagious respiratory illnesses that can cause severe disease and even death, especially in vulnerable populations. While they share some similar symptoms, there are also key differences in how they spread and their severity. Vaccines and public health measures are critical tools we have to limit the spread of the flu and COVID-19, whereas treatment options for RSV are more limited.

while the flu, COVID-19, and RSV are all contagious respiratory viruses, they differ in severity, at-risk populations, presence of vaccines, and public health measures needed to control spread. A coordinated public health response is necessary to limit the impacts of these diseases.

The flu and RSV are common respiratory tract infections that occur seasonally³. Covid-19 is a novel virus that emerged in late 2019 and has since become a global pandemic¹.

Prevention measures for these infections include vaccination, wearing masks, washing hands frequently, and avoiding close contact with infected individuals².

Answer:

60cm

Explanation:

30+30=60

Galileo's observation of the phases of Venus provided evidence that the Ptolemaic model of the solar system was incorrect. In the Ptolemaic model, Venus was supposed to orbit the Earth in a circular path.

However, Galileo observed that Venus went through a full set of phases, similar to the phases of the Moon, indicating that Venus must be orbiting the Sun and not the Earth. This observation was consistent with the heliocentric model of the solar system proposed by Copernicus, in which the planets orbit the Sun.

Galileo's observations of the moons of Jupiter and the sunspots also supported the heliocentric model and challenged the Ptolemaic model of the universe.

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Galileo's observation of Venus' changing phases proved that the Ptolemaic model, which suggested that Venus orbited Earth, was incorrect.

Galileo's observations of the phases of Venus played a significant role in proving that the Ptolemaic model of the solar system was incorrect.

According to the Ptolemaic model, Venus should always appear either in a crescent or gibbous phase, similar to the phases of the moon. However, Galileo observed that Venus went through a full set of phases, ranging from a crescent to a full disk and back to a crescent again, just like the moon.

This observation was only possible if Venus orbits the Sun and not the Earth, as the Ptolemaic model suggested. The phases of Venus provided strong evidence that the Sun, not the Earth, was at the center of the solar system. This observation supported the heliocentric model of the solar system proposed by Copernicus and challenged the geocentric model proposed by Ptolemy.

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(a) The average acceleration of the raindrop is 0.467 m/s².

(b) The average air resistance force on the raindrop is 1.4 x 10⁻³ N.

The average acceleration of the raindrop is calculated as follows;

Mathematically, the formula for average acceleration is given as;

a = Δv/Δt = v/t

where;

a = (7 m/s) / (15 s)

a = 0.467 m/s²

The average air resistance force on the raindrop is calculated as follows;

F = ma

where;

F = 0.003 x 0.467

F = 1.4 x 10⁻³ N

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The weight of the rock on Mars is 5.18 N.

The gravitational potential energy of the rock is indeed  -1.77×10⁷J​

(I) To determine the weight of the rock on Mars, use the formula for weight, which is given by:

Weight = Mass x Acceleration due to gravity

The acceleration due to gravity on Mars can be calculated using the formula:

Acceleration due to gravity = (Gravitational constant x Mass of Mars) / (Radius of Mars)²

Plugging in the given values:

Acceleration due to gravity = (6.67 x 10⁻¹¹ Nm²/kg²) x (6.42 x 10²³ kg) / (3.395 x 10⁶ m)²

= 3.71 m/s²

The weight of the rock can now be calculated as:

Weight = 1.40 kg x 3.71 m/s²

= 5.18 N

(ii) To find the gravitational potential energy of the rock, use the formula:

Gravitational potential energy = -(Gravitational constant x Mass of Mars x Mass of rock) / Distance between the center of Mars and the rock

The distance between the center of Mars and the rock is equal to the radius of Mars, which is given as:

Radius of Mars = 3.395 x 10⁶ m

Plugging in the values:

Gravitational potential energy = -(6.67 x 10⁻¹¹ Nm²/kg²) x (6.42 x 10²³ kg) x (1.40 kg) / (3.395 x 10⁶ m)

= -1.77 x 10⁷ J

Thus, the gravitational potential energy of the rock on Mars is -1.77 x 10⁷J.

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Answer:

Option (c) is the correct answer.

Explanation: When two substances does not exchange any energy with each other then they are said to be in thermal equilibrium with each other. This means the temperature of both the substances will be equal, that is why, there is no exchange of energy between them. Thus, we can conclude that when the objects have the same temperature then you can tell the two objects are in thermal equilibrium.

Answer:

B

Explanation:

The question does not specify any outside forces that could slow down the ball horizontally. There fore the ball does not accelerate or decelerate horizontally. Therefore,  a = 0m/s2

Answer:

=> Rheostat is an electric device used as a variable resistance, like the regulator of the fan. It is used to change the electric resistance in the electric circuit.

=> Rheostat works on the principle of Ohm’s law. Ohm’s law states that current in a circuit is inversely proportional to the resistance at the given temperature.

\( \infty \infty \infty \)

Answer:

dont know

Explanation:

need points

Answer:

electric field must not exceed 5000 V / m  ( 5 kV/m)

Explanation:

All electrical equipment produces electric and magnetic fields that must be within the range recommended by WHO, the upper limit for the sum of all fields is

  The electric field must not exceed 5000 V / m

to get an idea of ​​the intensity produced by one of the devices that has the largest electric field in the radio with 180 V / m

Answer

A zero net force acts on the ball at the highest point of its trajectory and at the moment it momentarily stops before changing direction.

When you throw a basketball straight up and catch it, there are two instances when a zero net force acts on the ball. Firstly, at the highest point of its trajectory, the ball momentarily comes to a stop before starting its descent. At this point, the force due to gravity acting downwards is balanced by an equal but opposite force exerted by your hand. Secondly, when the ball reaches its maximum height and starts to fall back down, it momentarily stops before changing direction. Again, at this moment, the upward force exerted by your hand is equal to the force of gravity acting downwards, resulting in a zero net force on the ball.

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The De Broglie wavelength can be obtained as 1.68 * 10^-8 m.

Quantum mechanics uses the DeBroglie wavelength to illustrate how matter behaves like a wave. It is named after French scientist Louis de Broglie.

According to DeBroglie's hypothesis, every particle has both particle-like and wave-like characteristics, including protons, electrons, and even large objects like tennis balls.

We know that;

λ= h/mv

λ= De Broglie wavelength

h = Plank's constant

m = mass of the electron

v = velocity of the electron

Then;

λ= 6.6 * 10^-34/9.11 * 10^-31 * 4.3 * 10^6

λ= 6.6 * 10^-34/3.917 * 10^-26

= 1.68 * 10^-8 m

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Answer:

The acceleration of the object is 4 m/s².

Explanation:

When a constant force acts upon an object, the acceleration of the object varies inversely with its mass i.e.

\(a=\dfrac{k}{m}\) ...(1)

Let us assume that the question is a certain force acting upon an object with mass 2 kg produces an acceleration of 38 m/s². if the same force acts upon another object whose mass is 19 kg, what would this object's acceleration be

Equation (1) can be written as :

\(\dfrac{a_1}{a_2}=\dfrac{m_2}{m_1}\)

Here,

a₁ = 38 m/s², a₂ =?, m₁ = 2 kg, m₂ = 19 kg

So,

\(\dfrac{38}{a_2}=\dfrac{19}{2}\\\\a_2=4\ m/s^2\)

So, the acceleration of the object is 4 m/s².

Answer:

breathable

Explanation:

sjdkjfiwosbfjrosbfjf

Hi there! :)

\(\large\boxed{\text{B. They are called gas giants.}}\)

In the solar system, we can categorize the planets as such:

Inner planets: Mercury, Venus, Earth, Mars

Outer planets: Jupiter, Saturn, Uranus, Neptune

The Inner planets are the only planets that consist of solid rock. They also do not have rings and have impact craters due to their early formation.

In comparison, all of the outer planets are primarily made up of gaseous material and contain rings.

Therefore, the correct choice is B.

The speed of the rubber stopper is approximately 79.93 cm/s. This calculation is based on the formula for speed, which involves dividing the circumference of the circle by the time taken.

The speed of an object moving in a circle can be calculated using the formula:

speed = circumference / time

In this case, the circumference of the circle is given as 112.76 cm, and the time taken to complete one revolution is 1.41 s.

Plugging in the values:

speed = 112.76 cm / 1.41 s

≈ 79.93 cm/s

Therefore, the speed of the rubber stopper is approximately 79.93 cm/s.

When whirling the rubber stopper in a circle with a string of length 112.76 cm and completing one revolution in 1.41 seconds, the speed of the stopper is approximately 79.93 cm/s. This calculation is based on the formula for speed, which involves dividing the circumference of the circle by the time taken to complete one revolution.

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The tension in the supporting wire is 31.5 N.

Given the mass, length, and angle of the rod with the horizontal, we can calculate the gravitational force acting on it as follows: F = m × g where m = mass of the rod = 3.20 kg g = acceleration due to gravity = 9.81 m/s²F = 3.20 × 9.81F = 31.39 N To find the tension in the supporting wire, we need to consider the horizontal and vertical components of forces acting on the rod.

The horizontal component of tension will be equal to the horizontal component of the gravitational force acting on the rod. The vertical component of tension will be equal to the difference between the gravitational force and the vertical component of the tension.

T = horizontal component of tension = F × cos 35°T = 31.39 × cos 35°T = 25.88 N. The vertical component of tension = F × sin 35°The vertical component of tension = 31.39 × sin 35°. The vertical component of tension = 18.54 N Tension in the supporting wire = √(T² + V²). Tension in the supporting wire = √(25.88² + 18.54²). Tension in the supporting wire = 31.5 N (to three significant figures) Therefore, the tension in the supporting wire is 31.5 N.

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Answer: Different types of fuels have varying compositions and release different amounts of pollutants when burned. Here are some common types of fuels and the pollutants associated with them:

Fossil Fuels:

a. Coal: When burned, coal releases pollutants such as carbon dioxide (CO2), sulfur dioxide (SO2), nitrogen oxides (NOx), and particulate matter (PM).

b. Petroleum (Oil): Burning petroleum-based fuels like gasoline and diesel produces CO2, SO2, NOx, volatile organic compounds (VOCs), and PM.

Natural Gas:

Natural gas, which primarily consists of methane (CH4), is considered a cleaner-burning fuel compared to coal and oil. It releases lower amounts of CO2, SO2, NOx, VOCs, and PM.

Biofuels:

Biofuels are derived from renewable sources such as plants and agricultural waste. Their environmental impact depends on the specific type of biofuel. For example:

a. Ethanol: Produced from crops like corn or sugarcane, burning ethanol emits CO2 but generally releases fewer pollutants than fossil fuels.

b. Biodiesel: Made from vegetable oils or animal fats, biodiesel produces lower levels of CO2, SO2, and PM compared to petroleum-based diesel.

Renewable Energy Sources:

Renewable energy sources like solar, wind, and hydropower do not produce pollutants during electricity generation. However, the manufacturing, installation, and maintenance of renewable energy infrastructure can have environmental impacts.

It's important to note that the environmental impact of a fuel also depends on factors such as combustion technology, fuel efficiency, and emission control measures. Additionally, advancements in clean technologies and the use of emission controls can help mitigate the environmental impact of burning fuels.

Answer:

It is 32.9

Explanation:

Answer:

Explanation:

They traveled this distance in 2 parts, essentially. Part 1 had an average speed for a certain number of hours, part 2 had an average speed for a certain number of hours, and those 2 parts taken together took them a distance of 364 km. In equation form, that looks like this:

km/hr part 1 + km/hr part 2 = 364 km

Now we need to find each part on the left side of that equation. Part 1 first:

We traveled 65 km/hr for 2 hours, so that took us

\(65\frac{km}{hr}*2hr\) and canceling out the hour label, we have that in part 1 we got

65(2) = 130 km. Good. Now onto the second part, where our unknown is.

We traveled 78 km/hr the second part for x hours, so that took us

\(78\frac{km}{hr}*xhr\) and canceling out the hour label, we have that in part 2 we got

78x km. Now we can fill in the main equation (the one in bold print)

130 km + 78x km = 364 km and subtracting 130 km from both sides:

78x km = 234 km and dividing by 78 km:

x = 3 hours. Part 2 took 3 hours. Part 1 took 2 hours, so the whole trip took 5 hours.

Answer:

Long question good luck:)

Explanation:

Answer:7

Explanation:

because its the right answer

The minimum diameter of the brass wire that can withstand a tensile force of 350 N without breaking is approximately 0.052 m or 52 mm.

To determine the minimum diameter of the brass wire that can withstand a tensile force of 350 N without breaking, we need to use the formula for tensile stress:

σ = F/A

We can rearrange the formula to solve for the cross-sectional area:

A = F/σ

We also need to use the formula for the cross-sectional area of a circle:

A = π\(r^2\)

where r is the radius of the wire.

Substituting the first equation into the second equation, we get:

A = π\(r^2\) = F/σ

Solving for r, we get:

r = √(F/πσ)

Substituting the values given, F = 350 N and assuming a tensile strength for brass of

σ = 100 x \(10^6\) Pa

= 100 x \(10^6\) N/m,

we get:

r = √(350 N / (π x 100 x \(10^6\)  N/m))

≈ 0.026 m

Therefore, the minimum diameter of the brass wire that can withstand a tensile force of 350 N without breaking is approximately 0.052 m or 52 mm.

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B 10,000 - 30,000 K Blue-white stars

A 7,500 - 10,000 K White stars

F 6,000 - 7,500 K Yellow-white stars

G 5,000 - 6,000 K Yellow stars (like the Sun)

The lowest temperature stars are red while the hottest stars are blue. Astronomers are able to measure the temperatures of the surfaces of stars by comparing their spectra to the spectrum of a black body.

Answer:

\(E = 2.9775\times10^5 J\)

Explanation:

Given:  The latent heat of fusion for Aluminum is \(L = 3.97\times10^5 J/Kg\)

mass to be malted m = 0.75 Kg

Energy require to melt E = mL

\(E = 3.97\times10^5\times0.75 = 2.9775\times10^5 J\)

Therefore, energy required to melt 0.75 Kg aluminum

\(E = 2.9775\times10^5 J\)

ANSWER

EXPLANATION

Parameteters given:

Initial velocity = 190 m/s

To find the maximum height, we apply the formula for the maximum height of a projectile:

where u = initial velocity

θ = angle with the horizontal

g = acceleration due to gravity = 9.8 m/s²

From the question, the projectile is fired vertically upward. This means that the projectile will make a 90° angle with the horizontal.

Therefore, we have that the maximum height of the projectile is:

Answer:

Height is equal to 1841.8367m

Explanation:

KE = GPE

Write out the formula

1/2(m)(v^2) = mgh

Fill it with the information you have

1/2(190^2) = (9.8)(h)

Solve

1/2(36100) = 9.8h

18050 = 9.8h

1841.83673 = h

Write the complete answer out

Maximum height is equal to 1841.8367m (meters)

Answer:

The person delivered a power of 2,558 Watt

Explanation:

Work and Power

Mechanical work is the amount of energy transferred by a force. It's a scalar quantity, with SI units of joules.

Being  the force vector and  the displacement vector, the work is calculated as:

\(W=\vec F\cdot \vec s\)

If both the force and displacement are parallel, then we can use the equivalent scalar formula:

W=F.s

Power is the amount of energy transferred per unit of time. In the SI, the unit of power is the watt, equivalent to one joule per second.

The power can be calculated as:

\(\displaystyle P=\frac {W}{t}\)

Where W is the work and t is the time.

If the person lifts a mass of m=200 Kg, then exerts a force equal to its weight:

F = m.g = 200*9.8 = 1,960

F = 1,960 N

The work done when lifting the weight 7 times by a distance of s=2.2 m is:

W = 7*1,960*2.2=30,184

W = 30,184 J

Finally, the power delivered in t=11.8 seconds is:

\(\displaystyle P=\frac {30,184}{11.8}\)

P = 2,558 Watt

The person delivered a power of 2,558 Watt