A block of metal has a width of 3.2 cm, a length of 17.1 cm, and height of 3.8 cm . its mass is 1.3 kg . calculate the density of the metal.express your answer to two significant figures and include the appropriate units.

Answer:

The correct answer is "the dollar to appreciate when compared to the Euro".

Explanation:

If fewer US dollars are required to buy one euro, this means that the value of the euro concerning this currency would fall. Therefore the dollar appreciates against the euro. This way you can buy more euros with the same amount of dollars you had before.

Have a nice day!

Answer:

Wavelength

Explanation:

The distance between the crest of one wave and the crest of the next wave is called wavelength of a wave. It is denoted by lambda λ. The maximum displacement of the particle of a wave is called amplitude of wave. The topmost value of displacement of the wave is called crest of a wave while the lowermost value of displacement of the wave is called trough of the wave.

Hence, by finding the distance between the crest of one wave and the crest of the next wave, we can determine the wavelength of a wave.

Answer:

0.143

Explanation:

m = F/a

   = (4.719 N)/(33 m/s²)

   = 0.143 kg

The speed of the snowball thrown downward when it is 5.0 m above the ground is 11.82 m/s, and the speed of the snowball thrown upward when it is 5.0 m above the ground is 13.44 m/s.

To find the speed of each snowball when it is 5.0 m above the ground, we can use the equations of motion for projectiles. For the snowball thrown downward, we can use the equation:

vf = sqrt(vi^2 + 2gh)

where vf is the final velocity, vi is the initial velocity, g is the acceleration due to gravity, and h is the vertical distance. For the snowball thrown upward, we can use the same equation with a negative value for h. Substituting the given values:

For the snowball thrown downward: vf = sqrt((13 m/s)^2 + 2*(-9.8 m/s^2)×(15 m - 5 m)) = 11.82 m/s

For the snowball thrown upward: vf = sqrt((13 m/s)^2 + 2×(-9.8 m/s^2)×(-15 m + 5 m)) = 13.44 m/s

Answer:

FALSE

Explanation:

The lesson says-

"At first, the body can't change quickly enough to give the muscles the amount of oxygen they need. This situation produces an oxygen deficit in the muscles. During this oxygen deficit, the muscles don't have the necessary amount of oxygen they need in order to produce enough energy to keep moving. Instead of the muscles just stopping, however, the body has a second system that kicks in during emergencies."

Answer: 120 J

Explanation:

The law of conservation of energy states that energy cannot be created nor destroyed, but only converted into other forms.

In this problem, we have an initial amount of electrical energy, E, converted into two forms of energy: light energy (L) and heat (H). For the law of conservation of energy, we have:

[tex]E=L+H[/tex]

So, we can find the initial amount of electrical energy:

[tex]E=20 J+100 J=120 J[/tex]

TO solve this problem, we simply have to find for the temperature of saturated water when the external pressure is 31 kPa. When the atmospheric pressure above a liquid equals its vapour pressure, then that liquid will boil. From the tables, the temperature at 31 kPa is about:

70 °C

The question 'How fast does an Australian terrier grow?' could be answered through scientific investigation. This requires data collection and analysis about dog growth rates. Other questions are subjective and lack the objective criteria necessary for scientific studies.

Out of the questions listed, the one that could be answered through scientific investigation is: 'How fast does an Australian terrier grow?' This question involves research and data collection on the growth rates of dogs, specifically Australian terriers. Scientists and veterinarians could conduct studies, measuring the size of these dogs at regular intervals and calculating average growth rates. Information can be analyzed statistically to derive at an answer.

Questions pertaining to dogs' affection, compatibility with cats, or attractiveness to children might not fulfil the objective criteria needed for a scientific investigation. These largely depend on subjective assessments and personal experiences, which could vary greatly among individuals.

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Hydrogen bonds in water lead to the expansion of ice, allowing it to float and serve as insulation in bodies of water.

Hydrogen bonds are crucial in water's unique properties: When water freezes, it expands due to hydrogen bonding, creating a less dense solid form compared to its liquid state. This expansion allows ice to float on water, insulating the liquid below and allowing life to exist.

The Bohr Atom wavelength is shorter when an electron moves from the n = 2 to the n = 3 energy level than when it moves from the n = 2 to the n = 4 energy level.

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Answer:

P = 4.0794 atm or  413,345.2 Pa

Explanation:

Given

Mass m = 14.0 g

Volume 3.5 L

Temperature T = 75° C = 75 + 273 = 348 K

Known Values

Molar mass of CO = 28 g/mol

Universal gas constant R = [tex]0.082057 L.atm/mol.K[/tex]

Solution

Number of moles in 14 g of CO is

[tex]\\n=\frac{mass}{molar.mass} \\\\n = \frac{14}{28} \\\\n = 0.5 mole[/tex]

[tex]PV = nRT\\\\P = \frac{nRT}{V} \\\\P = \frac{0.5 \times 0.082057 \times 348}{3.5} \\\\P = 4.0794 atm\\\\P = 4.0794 \times 101325\\\\P = 413,345.2 Pa[/tex]

Final answer:

To convert the density of uranium from g/cm³ to kg/m³, multiply the density by the factors to convert grams to kilograms and then cubic centimeters to cubic meters, resulting in a density of 18,800 kg/m³.

Explanation:

To convert the density of uranium from grams per cubic centimeter (g/cm³) to kilograms per cubic meter (kg/m³), we will use the conversion factors of 1 kg being equal to 1000 grams and 1 m³ being equal to 1,000,000 cm³. The density of uranium given is 18.8 g/cm³.

Step 1: Convert grams to kilograms.

Multiply the density value by the conversion factor to change grams to kilograms:

Density in kg/cm³ = 18.8 g/cm³ * 0.001 kg/g.

So, Density in kg/cm³ = 0.0188 kg/cm³.

Step 2: Convert cubic centimeters to cubic meters.

Now, multiply the density in kg/cm³ by the conversion factor to change cubic centimeters to cubic meters:

Density in kg/m³ = 0.0188 kg/cm³ * 1,000,000 cm³/m³.

So, Density in kg/m³ = 18,800 kg/m³.

The energy an object has as a result of motion is known as kinetic energy. A force must be applied to an object in order to accelerate it. We must put in effort in order to apply a force. After the work is finished, energy is transferred to the item, which then moves at a new, constant speed.

Kinetic energy, which may be seen in the movement of an object, particle, or group of particles, is the energy of motion. Any moving item uses kinetic energy, such as a person walking, a baseball being thrown, a piece of food falling from a table, or a charged particle in an electric field.

Explaination

Work may be bad, yes. -ve Work is considered to be completed when the system is functioning well and when your force is bearing fruit. When you exert force and the work is completed in the direction you intended, the work is considered successful. However, if there is an opposing force and the object moves in the opposite direction from where it was supposed to go, then the work done by U is negative but the work done by the opposing force is said to be positive.  If the object does not move and remains in place, then 0 work is done. force = work * The travel distance spose Because of the job you made, the object should move a short distance.

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The density of a [tex]36 g[/tex] object with a volume of [tex]15 cm^{3}[/tex] is [tex]2.4 g/cm^{3}[/tex].

Density of substance is defined as its mass per unit volume. Density gives information about how tightly the substance is packed together. The formula for density is

[tex]\rho = \frac{m}{V}[/tex]

Where,

[tex]\rho =[/tex]density

[tex]m =[/tex]mass

[tex]V =[/tex]volume

Unit of density is grams per cubic centimetre.

One of the most common uses of density is in how different materials interact when mixed together.

Given

[tex]m = 36 g[/tex]

[tex]V = 15 cm^3[/tex]

The density of substance is

[tex]\rho = \frac{m}{V}\\\rho = \frac{36}{15}\\\rho = 2.4 g/cm^3[/tex]

Hence, The density of a substance is [tex]2.4 g/cm^3[/tex].

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Assuming that the students worldwide are being considered, because of the extremely large population, this can be considered as a binomial distribution. A normal distribution is used most usually as a fair approximation of the binomial. The mean is the expectation, therefore:
E[x] = np = (16)(0.22) = 3.52 
μ = 3.52 

To find the mean for the number of students who work full time in samples of size 16, multiply the sample size by the percentage of students who work full time.

To find the mean for the number of students who work full time in samples of size 16, we can simply multiply the sample size (16) by the percentage of students who work full time (22%):

Mean = 16 * 0.22 = 3.52

Therefore, the mean number of students who work full time in samples of size 16 is 3.52.

The weight of a standard gold bar is approximately 12.4 kilograms with a market value of around $744,000, based on a gold price of $60,000 per kilogram. The density of gold is critical for determining its authenticity, distinct from similar materials like tungsten.

The weight of a gold bar and its worth can vary significantly depending on the size of the bar and the current market value of gold. Generally, gold bars can come in different sizes, but a standard bar, also known as a gold ingot, is approximately 400 troy ounces or about 12.4 kilograms. Based on the density of gold, which is 19.30 g/cm3, a standard gold bar would have a volume of approximately 643.15 cm3 (since 12400 g / 19.3 g/cm3).

If we consider the approximate market value of gold, which is about $60,000 per kilogram, a standard 400 troy ounce gold bar would be worth around $744,000. However, the price of gold fluctuates constantly due to market conditions. It's also worth mentioning that the density of gold is a critical factor in determining its authenticity; fraudsters have been known to sell gold-plated tungsten ingots as pure gold because of tungsten's similar density to gold.

To solve this we must be knowing each and every concept related to photon. Therefore, the energy of a photon of light emitted by an electron is equal to Energy difference between two levels.

A photon is indeed an elementary particles which is a quantum of a electromagnetic field, comprising electromagnetic radiations like as light but also radio waves, and the electromagnetic force's force carrier.

Electrons are negative charges subatomic particles that spin in their separate sub orbitals outside the nucleus. Every electron is characterized by it's own energy level and is electrostatically attracted to the nucleus.

Therefore, the energy of a photon of light emitted by an electron is equal to Energy difference between two levels.

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Answer:

Reverse osmosis

Explanation:

In order to purify the water which has been contaminated with salt and microorganisms, reverse osmosis will be the best way. In reverse osmosis a pressure is applied on the salt side of the impure water using a pump. Doing this prompts the pure water to leave the salt side so pure water moves another side of the semi permeable membrane. The semi permeable also filters the microorganisms. Hence, pure water can be obtained easily from this impure sample. The RO at our houses use this process to purify water.

Answer:

anime

Explanation:

anime=LIFE