Answer:
B) the law of reflection
Explanation:
When a light ray reflects off a surface, it obeys the law of reflection.
A few definitions before giving the law of reflection:
- The angle of incidence is defined as the angle between the incident ray and the normal to the surface
- The angle of reflection is defined as the angle between the reflected ray and the normal to the surface
The law of reflection states that:
- The angle of incidence is equal to the angle of reflection
- The incident ray and the reflected ray lie both on the same plane.
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What information might you be able to find from the gun and bullets found at the crime scene?
information you might be able to find is the type of gun used and you can collect the fingerprints from the gun and you can possibly locate from where they shot at
Answer:
Explanation:
A crime scene is a location where evidences relating to the crime can be found. The bullets and guns can be useful evidences which can be used to link the criminal with the crime.
Over the gun and bullets fingerprints of the culprit can be found. The gun and bullets may exhibit the class and individual characteristics which can be observed and analyzed.
The class characteristics will include the name of the maker, make and model, design which could be common to many guns and bullets from the same manufacturing company.
The individual characteristics will include the features develop due to wear and use of the gun and the bullet. The barrel of the gun may contain trace amounts of gun shot residues, these will also be present on the surface of the fired bullets.
This is also required to be find out that the bullet can be fired from the gun obtain from the scene of crime or not. The test bullet can be fired from the same gun so as to determine whether the bullet found at the crime scene was fired from the same firearm by comparing the diameter of the barrel with that of the size of the bullets. The striation marks, breech face marks, firing pin marks can be found over the surface of the surface of the bullets generated due to the firing process from gun.
When did rock layer H form relative to the other rock layers? In your answers, compare layer H to as many rock layers as you can.
The formation of rock layer H can be determined relative to other layers using stratigraphy, fossil content, and potentially radiometric dating. Its position in the sequence of layers indicates its relative age while the fossils it contains can correlate it with other layers formed in a similar period. Radiometric dating can provide an absolute age if needed.
Explanation:In the field of geology, the formation of rock layer H can be understood in relation to other rock layers through the method of stratigraphy. Essentially, the principle of stratigraphy states that in undeformed stratigraphic sequences, the oldest strata will be at the bottom with newer layers deposited on top. Therefore, to understand when layer H formed, one would need to examine the position of rock layer H in the sequence. For instance, if layer H is found below layer G but above layer I, we can tell that rock layer H formed after I but before G.
Fossil content can also provide clues to the relative age of the layers. For example, if rock layer H contains fossils that are found in rock layers G and I, it may indicate that these layers were formed during a similar geological period.
A third way is through the use of radiometric dating, which uses the decay of isotopes in the rocks to determine their age. However, this method is typically used to provide an absolute age to rock layers rather than their relative ages.
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Rock layer H's age relative to other layers can be determined by its position in a stratified formation (archaeological stratification) and the use of radiometric dating. The type of rock also provides clues to its age and formation process.
Explanation:When considering the formation of rock layer H relative to other rock layers, it's imperative to understand geological concepts like stratification and radiometric dating. For instance, if rock layer H is positioned below another rock layer in a stratified formation, it can be inferred that layer H is older. This technique, called archaeological stratification, uses the relative position of layers to identify their age sequence.
Additionally, the exact age of rock layers can be obtained using radiometric dating methods, which leverage the rate of radioactive decay in certain minerals within the rocks, providing a timeline for their formation. If rock layer H is composed of such minerals, its formation age can be determined, revealing when it was formed in relation to other layers.
Identifying the type of rock is important as well; if layer H is a primitive, sedimentary, or volcanic rock, it provides additional clues to its age and its formation process. For instance, sedimentary rock layers are typically formed in the presence of water, and their positioning can reveal historical water levels.
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Which of the following describes scientists best idea about the formation and expansion of the universe
A. The big bang theory is how scientists think the world was created.
Succession occurs when environmental factors affecting an ecosystem change. Please select the best answer from the choices provided T F
The statement given in the question is FALSE.
Ecological Succession refers to the change in the specie structure of an ecosystem over a long period of time. There are two types of succession, primary and secondary succession. A primary success is said to occur when an ecosystem is totally destroyed to the extent that even the soil is wipe out. In this case, the ecosystem development has to start from the scratch. A succession is said to secondary if only part of the ecosystem is destroyed.
Answer:
The answer is TRUE
Explanation:
got it right on Edge 2023
A chemical reaction is the only way to separate a(n) . Mark this and return
A chemical reaction is the only way to separate a pure substance because in terms of chemical composition, an element can't be broken down any more further, or separated. Some mixtures and solutions can be broken down with physical means, not just chemical reactions.
A Pure substance is only separated by a process of chemical reaction.
What is a Pure Substance?Pure substances are composed of only one kind of particle and have a constant or unchanging structure.
Elements and compounds are subclasses of pure substances:
An element is a substance that only contains one kind or class of atoms. An element is a pure material if it cannot be broken down or converted into other compounds by physical or chemical mechanisms. Metals, nonmetals, or metalloids make up the vast bulk of elements.
On the other hand, when two or more elements are chemically combined in a specific ratio, compounds can also be considered pure substances. However, these substances can be split up into their component parts through chemical processes.
To break down pure substances (elements and compounds) into their individual atoms or elements, a chemical reaction must take place.
Physical techniques cannot distinguish between pure substances.
Hence, Pure substance is only separated by a process of chemical reaction.
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How would the tides be different if the Moon revolved around Earth twice a month instead of once a month?
A) High and Low Tide would be more intense
B) There would be no change in the tide
C) There would be 4 spring tides and 4 neap tides a month instead of two
D) There would be 4 spring tides and no neap tide
The correct answer is C.
Explanation:Neap tides are those tidal waves that have the smallest range between high tide and low tide and occur twice in a month.
Spring tides are the tidal waves that have the biggest range between high tide and low tide, and are also seen to occur twice a month.
If the moon revolved twice a month around the Earth, it would mean that the lunar cycle would be of 15 days -meaning 30 days/a month would incorporate two lunar cycles. As the spring and neap tides occur twice each in one lunar cycle, they will occur four times in 30 days.
Hope this helps!How does pressure change as the depth below the surface of a fluid increases?
Answer:
The pressure increases linearly with the depth below the surface
Explanation:
The pressure at the bottom of a column of fluid is given by:
[tex]p=p_0 + \rho gh[/tex]
where
[tex]p_0[/tex] is the atmospheric pressure
[tex]\rho[/tex] is the fluid's density
g is the gravitational acceleration
h is the depth below the surface of the fluid
As we see from the equation, the pressure is directly proportional to h, the depth below the fluid surface: therefore, as h increases, the pressure increases as well.
If one bullet is dropped from a certain height and another is fired from a gun horizontally from the same height which one will hit the ground first or will they hit at the same time?
If the ground is flat, and both bullets are released at the same time from the same height, then they both hit the ground at the same time.
The horizontal motion of the one from the gun has no effect on its vertical motion.
After exercise, your heart rate is ____ and you need to slowly bring it back to normal
A. Lowered
B. Destabilized
C. Elevated
D. Tripled
Heart rate is the rate at which the heart beats per minute. It is a very important function of the human body. After doing exercise heart rate is elevated you need to gradually get it to normal.
What is heart rate?The heart rate is the number of times the heartbeats per minute.
During training, the heart will speed up. The highest heart rate is varying which is relying on age.
The role of the heart is to accept blood that is oxygen deficient from veins and pump it to the lungs.Where it gathers up oxygen and gets freed of carbon dioxide.
The main function of blood is to pump the blood into different portions of the body.
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2. Which of the following is considered to be a vector? A. Temperature B. Velocity C. Time D. Mass
Answer: B) Velocity
Explanation:
Velocity is a vector quantity. Velocities have both magnitude and direction.
Velocity is considered to be a vector. Velocity is a vector quantity. it is a time-based component. Option C is correct.
What is a vector?A vector is a quantity or phenomena with magnitude and direction that are independent of one another.
The change of displacement with respect to time is defined as the velocity.
Velocity is a vector quantity. it is a time-based component. Velocity at any angle is resolved to get its component of x and y-direction.
Hence, option C is correct.
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What is the period of a wave if the wavelength is 100 m and the speed is 200 m/s?
0.5 would be your answer >:o)
The statement that is chemical reaction the total mass of the reaction equals the total mass of the products is the law of
Hi, the answer to this would be the conservation of mass.
Some history on this: The law of the conservation of mass was founded by a french chemist named Antoine Lavoisier, and stated that: matter cannot be created or destroyed in a chemical reaction.
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Propane (C3H8combines with oxygen gas (O2to form carbon dioxide (CO2and water (H2O). Describe the number and type of atoms for a molecule of each substance.
The balanced equation for the combustion of propane is C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(l), indicating that one molecule of propane reacts with five molecules of oxygen to produce three molecules of carbon dioxide and four molecules of water, keeping the atom count consistent on both sides of the reaction.
Combustion of Propane
To balance the chemical equation for the combustion of propane (C₃H₈), we must account for the number and type of atoms in both the reactants and the products to comply with the law of conservation of mass. The balanced equation is C₃H₈(g) + 5O₂(g)
ightarrow 3CO₂(g) + 4H₂O(l). Each molecule of propane contains 3 carbon atoms and 8 hydrogen atoms. When propane combusts in the presence of oxygen gas, it forms carbon dioxide and water. For carbon dioxide, each molecule contains 1 carbon atom and 2 oxygen atoms, and for water, 2 hydrogen atoms are bonded to 1 oxygen atom.
In the balanced reaction, we can break down the numbers further:
1 molecule of propane (C₃H₈) reacts with 5 molecules of oxygen (O₂).
3 molecules of carbon dioxide (CO₂) are produced.
4 molecules of water (H₂O) are formed.
This ensures that we have the same number of each type of atom on both the reactant and product sides of the equation.
how is the speed of light affected when it passes through air, water, or glass ?
Answer:
It decreases
Explanation:
The speed of light in a vacuum is
[tex]c=3.0\cdot 10^8 m/s[/tex]
When it travels into a medium, however, light slows down. the speed of light in a medium is given by the equation
[tex]v=\frac{c}{n}[/tex]
where
v is the speed of light in the medium
c is the speed of light in a vacuum
n is the refractive index of the medium
We see that the larger the refractive index of the medium, the lower the speed of light in that medium. For air, water and glass we have:
Air: [tex]n=1.000277[/tex]
Water: [tex]n=1.33[/tex]
Glass: [tex]n=1.52[/tex]
So we can calculate the speed of light in the three mediums:
Air: [tex]v=\frac{3.0\cdot 10^8 m/s}{1.000277}\sim 3.0\cdot 10^8 m/s[/tex]
Water: [tex]v=\frac{3.0\cdot 10^8 m/s}{1.33}\sim 2.26\cdot 10^8 m/s[/tex]
Glass: [tex]v=\frac{3.0\cdot 10^8 m/s}{1.52}\sim 1.97\cdot 10^8 m/s[/tex]
As shown in the diagram, two forces act on an object. The forces have magnitudes F1 = 5.7 N and F2 = 1.9 N. What third force will cause the object to be in equilibrium?
3.8 N at 108° counterclockwise from
6.3 N at 162° counterclockwise from
3.8 N at 162° counterclockwise from
6.3 N at 108° counterclockwise from
Answer:
Second option 6.3 N at 162° counterclockwise from F1
Explanation:
Observe the attached image. We must calculate the sum of all the forces in the direction x and in the direction y and equal the sum of the forces to 0.
For the address x we have:
[tex]-F_3sin(b) + F_1 = 0[/tex]
For the address and we have:
[tex]-F_3cos(b) + F_2 = 0[/tex]
The forces [tex]F_1[/tex] and [tex]F_2[/tex] are known
[tex]F_1 = 5.7\ N\\\\F_2 = 1.9\ N[/tex]
We have 2 unknowns ([tex]F_3[/tex] and b) and we have 2 equations.
Now we clear [tex]F_3[/tex] from the second equation and introduce it into the first equation.
[tex]F_3 = \frac{F_2}{cos (b)}[/tex]
Then
[tex]-\frac{F_2}{cos (b)}sin(b)+F_1 = 0\\\\F_1 = \frac{F_2}{cos (b)}sin(b)\\\\F_1 = F_2tan(b)\\\\tan(b) = \frac{F_1}{F_2}\\\\tan(b) = \frac{5.7}{1.9}\\\\tan^{-1}(\frac{5.7}{1.9}) = b\\\\b= 72\°\\\\m = b +90\\\\\m= 162\°[/tex]
Then we find the value of [tex]F_3[/tex]
[tex]F_3 = \frac{F_1}{sin(b)}\\\\F_3 =\frac{5.7}{sin(72\°)}\\\\F_3 = 6.01 N[/tex]
So the answer is 6.3 N at 162° counterclockwise from F1
a ray of light that strikes a surface is known as?
a. incident angle
b. reflection angle
c. reflection ray
d. incident ray
A ray of light that strikes a surface is known as the incident ray. (d)
In the physics of optics, it has been defined that the incident rays are the rays which strikes the surface.
Answer : Option D
Explanation:
When the ray of light strikes the surface it is know as ''incident ray''. The angle which it makes with the normal or the perpendicular imagined or drawn to the surface is the ''incident angle''.
According to the ''Law of Reflection'', the incident ray after striking the surface is reflected back, the ray which leaves the surface is called the ''Reflected Ray''. The angle which is made between the same normal and reflected ray is the reflected angle.
A dog walks with a speed of 1.5 m/s. How long will it take the dog to cross a yard of length 8 m? O A. 5.3 s O B. 1.3 s O C. 12s O D. 8s
The time taken for the dog to cross a yard of length 8 meters is 5.3 seconds.
What is the time taken for the dog to cover the given distance?Speed is simply referred to as distance traveled per unit time.
Mathematically, it is expressed as:
Speed = Distance ÷ time
Given the parameters:
Speed of the dog = 1.5 meters per seconds
Distance covered 8 meters
Time taken =?
To determine the time taken by the dog to cover a distance of 8 meters, plug the given values into the above formula and solve for the time.
Speed = Distance ÷ time
1.5m/s = 8m / time
Time × 1.5m/s = 8m
Time = 8 / 1.5
Time = 5.3 seconds
Therefore, the time taken is approximately 5.3 seconds.
Option A) 5.3s is the correct answer.
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The Sun's gravitational attraction, along with a planet's _______, keeps the planet moving in a(n) _______ orbit and determines the orbital speed. A. inertia; elliptical B. temperature; linear C. tectonic activity; irregular D. magnetic field; circular
a- inertia, elliptical
Answer:
Explanation:
a is the answer
a measurement of 152.4 mm has 4 significant figures, because there are 4 digits. What about 152,400 mm? How many significant figures do you think it has
Answer:
Also 4.
Explanation:
If there was a decimal point after the last zero, you'd count the two zeroes as significant.
The measurement 152,400 mm has three significant figures because the trailing zeros are not significiant in a whole number without a decimal point. This indicates the precision of the measuring tool used for the measurement.
The question asks about the number of significant figures in the measurement 152,400 mm. According to the rules for determining significant figures, trailing zeros in a whole number without a decimal point are not significant. Therefore, only the digits 1, 5, and 2 are significant because they precede the non-significant trailing zeros. However, if the measurement were provided with a decimal point, as in 152,400., all the zeros would be significant due to the presence of the decimal point. Given the fact that there is no decimal point, the number 152,400 mm has three significant figures.
It is important to remember that significant figures are a way of expressing precision in measurement. For instance, if a number is written in scientific notation, all digits in the coefficient are considered significant. For the number 152,400 mm in scientific notation, it would be written as 1.524 x 10⁵ to indicate that there are four significant figures, assuming decimal precision was intended. However, given the original format (152,400), we conclude it has only three significant figures.
An object weighs 30 N on Earth. A second object weighs 30 N on the moon. Which has the greater mass? Question 15 options: The one on the moon The one on Earth Not enough information to say They have the same mass.
Earth gravity = 9.8 m/s²
Moon gravity = 1.6 m/s²
Weight = (mass) x (gravity)
Divide each side by (gravity) and then it says:
Mass = Weight / gravity
Object on Earth: Mass = (30N) / (9.8 m/s²) = 3.06 kg
Object on Moon: Mass = (30N) / (1.6 m/s²) = 18.52 kg
If two objects have the same weight on Earth and on the Moon, then the one on the Moon must have more mass. Six times as much mass, in fact.
If you were to walk with a speed if 2m/s for 2 hours how far would you travel
Final answer:
By walking at a speed of 2m/s for 2 hours, you would cover a distance of 14,400 meters, after converting the hours into seconds for compatibility in calculation.
Explanation:
If you were to walk with a speed of 2m/s for 2 hours, you can calculate the distance traveled by using the formula for distance, which is speed × time. In this case, your speed is 2 meters per second (m/s), and your time is 2 hours. However, to use the formula correctly, you need both measurements in compatible units. Since 1 hour equals 3600 seconds, 2 hours equals 7200 seconds. Thus, the calculation should be 2 m/s × 7200 s, which equals 14,400 meters.
What are the standard units of specific gravity?
g/cm3
kg/L
kg/cm3
none
the answer is b.kg/L
the proper answer is 1.0 kg per litre
Answer:
The answer is: g / cm3.
Explanation:
Specific gravity is a comparison of the density of a substance with the density of water.
The specific gravity of water at a standard temperature and pressure is considered as one, so if the specific gravity of a substance is five, it means that it is five times denser than water.
It is common that said substance is always water, since it is known that it has 1 gram per milliliter or 1 gram per cubic centimeter.
The answer is: g / cm3.
How can a small human retina detect objects larger than itself?
a. Lenses of the eye change the size of the images.
b. The brain interprets the size of the images.
c. The cells of the retina change the size of the images.
d. The optic nerve interprets the size of the images.
The correct answer would be A) the lenses of the eye change the size of images
The human retina can detect objects larger than itself through the lenses of the eye and interpretation by the brain.
Explanation:The small human retina can detect objects larger than itself through a complex process involving the lenses of the eye and the interpretation by the brain. The lenses of the eye focus the incoming light onto the retina, creating an image that is larger than the retina itself. The retina then captures this image and sends signals to the brain, which interprets the size of the image based on the information received from the retina.
So, the correct answer to the question is a. Lenses of the eye change the size of the images. The lenses of the eye help the small retina capture and process larger images, allowing us to see objects that are larger than our retina.
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If the temperature of a gas is increase by 10 x , what will happen to the volume?
A) It will decrease by -10.
B) It will increase by +10.
C) It will decrease by 1/10.
D) It will increase by 10x.
-- None of the choices answers the question correctly. It's not that simple.
The only thing you can say about the result is that the product of (pressure)x(volume) will increase by 10x.
-- You can keep the volume of the gas constant if you want to, while it gets 10x hotter. (Just keep it in the same bottle and don't let it expand.) But if you do that, its PRESSURE will increase by 10x.
-- If you want to keep the pressure of the gas constant while it gets 10x hotter, then you'll have to let it expand to 10x its original volume.
Also, by the way, the question doesn't mean you just multiply the Celsius or Fahrenheit temperature by 10. When you're playing with the pressure, volume, and temperature of a gas, it's the ABSOLUTE temperature you need to look at ... like Kelvins, or (Celsius+273°), or (Fahrenheit+460°).
Predict: During a solar eclipse, our view of the sun is blocked by the moon. In the diagramam, draw where you think the moon is located when the observer on Earth is experiencing a solar eclipse
☀️
As it states, the "Sun is blocked by the moon". This means, you'd draw the moon in front of the sun, filling most of sun in the diagram. In 2017, we actually got to experience this! Try and think back to any memories you may have looking through solar glasses.
Help please with number 7 !!!!!!! Plz ahhhhhh
it is the Atlantic ocean
Pollution and the depletion of _____ may be caused by the production of electric energy.
A.) Resources
B.) Magnets
C.) Electric Fields
the answer is a resources
The pollution and the depletion of resources may be caused by the production of electric energy. The power generation might be associated with some atmospheric pollution .
What is electric energy ?Electric energy is form of energy that can be generated from other forms of energy such as kinetic , mechanical, thermal energy etc. All the electric devices are working by the consumption of electric energy.
Electric energy is usually generated from hydrothermal energy, nuclear energy, wind energy etc. In all these cases, energy is transforming from one form to the other.
Nuclear power plants, coal fields, etc. working for power generation is associated with some pollution that threats the surrounding livings. Depletion of these resources leads to some unwanted products and toxic gases.
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Which of the following statements describes the difference between physical and chemical weathering?
A. Physical weathering affects rocks, while chemical weathering affects only minerals.
B. Physical weathering is caused by ice, while chemical weathering is caused only by water.
C. Chemical weathering changes the composition of a rock, while physical weathering does not.
D. Chemical weathering affects all kinds of rocks, while physical weathering does not.
B. Physical weathering is caused by ice, while chemical weathering is caused only by water.
Answer:
Chemical weathering changes the composition of a rock, while physical weathering does not.
Explanation:
Chemical weathering of rocks is a chemical reaction. A chemical change is known to change the composition of a substance. Once a substance is subjected to a chemical reaction, a new substance is automatically formed thereby changing the composition of the original substance.
A physical weathering agent does not affect the composition of rocks. This a major difference between chemical and physical weathering processes. For instance, physical weathering caused by ice has nothing to do with internal rock composition.
A sodium vapor lamp emits light waves with a frequency of 5.26 x 1014 Hz. What is the wavelength of the light?
Answer:
570 nm
Explanation:
The wavelength of an electromagnetic wave is given by:
[tex]\lambda=\frac{c}{f}[/tex]
where
[tex]c=3.0\cdot 10^8 m/s[/tex] is the speed of light (the speed of the electromagnetic waves in a vacuum)
[tex]f=5.26\cdot 10^{14} Hz[/tex] is the frequency of the emitted light
Substituting the numbers into the equation, we can find [tex]\lambda[/tex], the wavelength of the emitted light:
[tex]\lambda=\frac{3\cdot 10^8 m/s}{5.26\cdot 10^{14} Hz}=5.70\cdot 10^{-7} m = 570 nm[/tex]
Calculate the wavelength of the electromagnetic radiation whose frequency is 7.5 x 10^12 Hz
velocity of electromagnetic waves=3.0×10^8.
wavelength=velocity/frequency
(3.0×10^8)/(7.5×10^12)
=0.00004
The wavelength of electromagnetic radiation with a frequency of 7.5 x 10^12 Hz is 40 nm.
Explanation:To calculate the wavelength of electromagnetic radiation with a frequency of 7.5 x 10^12 Hz, we can use the formula c = fλ, where c is the speed of light and f is the frequency. Rearranging the formula, we get λ = c/f. Plugging in the given values, λ = (3.00 x 10^8 m/s)/(7.5 x 10^12 Hz). Calculating this gives us a wavelength of 4 x 10^-5 meters or 40 nm.
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