As more resistors are added in parallel across a constant voltage source, there are more paths for current to take. So more current dribbles out of the source, and the total current supplied by the source increases.
The power supplied by the battery is (voltage) x (current). So if the voltage is constant and the current increases, the power being supplied must also increase.
choice-c
Leonard designed a parallel circuit to light two lightbulbs. But his circuit doesn't work. Which two items in the circuit must be addressed for the lightbulbs to light as planned?
Answer:
1. The source of power
2. Connection and accessories including, the power cable condition, switches and light bulbs
Explanation:
The items listed above should be tested with a suitable probe and any identified defective component should be replaced
What do we mean when we say that the sun is in gravitational equilibrium?
D)
It has played a role throughout the Sun's history, but it was most important right after nuclear fusion began in the Sun's core. What do we mean when we say that the Sun is in gravitational equilibrium? ... There is a balance within the Sun between the outward push of pressure and the inward pull of gravity.
When we say that the sun is in gravitational equilibrium, it simply means that there's a balance within the sun between the outward push of pressure and the inward pull of gravity.
The sun is important as it holds the solar system together. The sun is the most important body to the Earth. It. helps in the provision of heat and energy to the Earth. Without the sun, the Earth will be lifeless.It should be noted that the sun is stable. In this case, it's neither contracting nor expanding. In this case, the sun is in equilibrium and the forces within it are balanced.Gravitational Equilibrium ensures that the core of the sun is at the right level of nuclear fusion. When the sun is in gravitational equilibrium, there is a balance within the sun between the outward push of pressure and the inward pull of gravity.In conclusion, the amount of energy that's released by fusion in the core of the sun will then be equal to the amount of energy that radiated from the surface of the sun into space.
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In which type of chemical reaction are electrons transferred
Answer:
Redox reactions
Explanation:
Redox (Reduction-Oxidation) reactions are reactions which involves the transfer of electrons. Here, one specie loses electrons while the other gains the electrons. The loss and gain of electrons makes one atom reduced while the other becomes oxidized. Transfer of electrons from one specie to another would eventually lead to a change in oxidation number of the reactants as they proceed to form products.
In non-redox reactions, there is no loss or gain of electrons and no change in oxidation number. An example is neutralization reaction.
What property of objects is best measured by their capacitance?
Explanation:
The capacitance [tex]C[/tex] is defined as the relationship between the electric charge of each conductor and the potential difference between them. That is, it is the capacity of a device to store electrical charge.
In other words:
It is the property that bodies have to maintain an electric charge.
Mathematically it is defined as:
[tex]C=\frac{Q}{V}[/tex]
where:
[tex]C[/tex] is the capacitance value of a capacitor. Its unit is Farad [tex]F[/tex]; named in honor of the physicist Michael Faraday
[tex]Q[/tex] is the electric charge of the conductor, measured in coulombs [tex]C[/tex].
[tex]V[/tex]is the electric potential to which the conductor is located, measured in Volt.
The property of objects best measured by their capacitance is their ability to store electrical charge.
Explanation:The property of objects that is best measured by their capacitance is their ability to store electrical charge. Capacitance is a measure of how much charge an object can hold per unit voltage. It depends on the size and shape of the object, as well as the material between its conductive plates or electrodes.
Capacitors are devices that are specifically designed to have a high capacitance. They are used in many electronic circuits to store and release electrical energy. The capacitance of a capacitor can be increased by increasing the area of the plates, decreasing the distance between them, or changing the dielectric material between them.
Measuring capacitance is important in various applications, such as designing and optimizing electronic circuits, as well as understanding the behavior of electrical systems in general.
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A force of 45 newtons is applied on an object, moving it 12 meters away in the same direction as the force. What is the magnitude of work done on the object by this force? Part A: Enter the variable symbol for the quantity you need to find. Use your keyboard and the keypad to enter your answer. Then click Done.
Explanation:
The Work [tex]W[/tex] done by a Force [tex]F[/tex] refers to the release of potential energy from a body that is moved by the application of that force to overcome a resistance along a path.
Now, when the applied force is constant and the direction of the force and the direction of the movement are parallel, the equation to calculate it is:
[tex]W=(F)(d)[/tex] (1)
In this case both (the force and the distance in the path) are parallel (this means they are in the same direction), so the work [tex]W[/tex] performed is the product of the force exerted to push the box [tex]F=45N[/tex] by the distance traveled [tex]d=12m[/tex].
Hence:
[tex]W=(45N)(12m)[/tex] (2)
[tex]W=540Nm=540J[/tex]
Answer: W
Explanation:
For Edmentum the answer is simply W
Is the wavelength comparable to the size of atoms?
The wavelength of objects like baseballs is extremely small compared to the size of atoms, rendering such wavelengths undetectable in the macroscopic world. However, for subatomic particles like electrons, their wavelength can be comparable to the size of atoms, influencing their behavior and energy levels within the atom. X-rays have wavelengths comparable to the size of the structures they interact with, allowing them to be effective in observing atomic and molecular structures.
Explanation:When considering the size of an atom, which is typically on the order of 0.1 nanometers (10-10 meters), and comparing it to the wavelengths of various particles or types of radiation, we can make several observations. For instance, the diameter of an atom's nucleus is approximately 10⁻¹⁴ meters.
If we calculate the wavelength of a 0.145 kg baseball moving at 40 m/s, the resultant wavelength would be about 10-34 meters. This is immeasurably small compared to the size of an atom, indicating Their wavelength is very small compared to the object's size.
However, for subatomic particles like electrons, the wavelength is of the same order of magnitude as the size of an atom. The wavelike behavior of electrons is significant when they are confined within the atom, as this affects their possible energy levels. In the case of X-rays, the wavelength is comparable to the size of the structures it interacts with, such as the distances between atoms in a molecule, allowing X-rays to 'see' these structures.
If we scale an atom up to a size comparable to a mid-sized campus, the nucleus would be only a tiny fraction of that size, possibly comparable to a small familiar object like a marble.
Final answer:
Wavelengths of everyday large objects are considerably smaller than the size of atoms, and thus their wave properties are not detectable. However, for subatomic particles like electrons, their wavelengths can be of the same order as the size of atoms, indicating observable wavelike behavior. X-rays have wavelengths comparable to atomic dimensions and can effectively image atomic structures.
Explanation:
When considering the scale of wavelengths to the size of atoms, it's important to understand that typically the wavelength of everyday large objects, such as a baseball, is considerably smaller than atomic dimensions. If we calculate the wavelength of a 0.145 kg baseball moving at a speed of 40 m/s, we would get a wavelength of approximately 10-34 m. This is so short that it is undetectable even with the most advanced scientific instruments and is much smaller than the size of an atom, which is in the order of 10-10 m.
In contrast, the phenomena of wave-particle duality, as demonstrated by electrons, shows that wavelike behavior becomes prominent when the wavelength of particles is on the order of magnitude of atoms. The classic example involves the wave nature of electrons showing quantized wavelengths that fit just right around an atom, explaining why they can only occupy specific energy levels within an atom.
The significance of wavelengths being comparable to atomic sizes comes into focus especially in fields involving the electromagnetic spectrum, such as when using X-rays to probe structures at the atomic or molecular level. Here, the fact that the wavelength of X-rays is comparable to the spacing between atoms allows for the detailed imaging of such structures through diffraction patterns.
Which of the following represents an upside-down image?
O A. +do
O B. -do
O c. +m
O D.-m
Answer:
D. -m
Explanation:
The magnification of an image is equal to the following ratio:
[tex]m = \frac{y'}{y}[/tex]
where
y' is the size of the image
y is the size of the real object
We have two situations:
- When m is positive, it means that y' has the same sign of y --> so the image has same orientation of the object (= image is upright)
- When m is negative, it means that y' has opposite sign to y --> so the image has opposite orientation to the object (= image is upside down)
So, the correct answer that describes an upside-down image is
D. -m
Final answer:
The representation of an upside-down image in optical physics is given as option D. -m, indicating a negative magnification, which means the image is inverted relative to the object.
Explanation:
The question is related to the formation of images by mirrors or lenses in physics and specifically refers to the sign conventions used to describe the nature of images. An upside-down image is produced when the magnification (m) is negative. This negative magnification indicates that the image is inverted relative to the object. In optics, a real image (produced by a single lens or mirror that can be displayed on a screen) is considered to be upside down if its magnification is negative. Thus, the option that represents an upside-down image is D. -m.
An athlete is working out in the weight room. He steadily holds 50 kilograms above his head for 10 seconds. Which statement is true about this situation? A. The athlete isn't doing any work because he doesn't move the weight. B. The athlete isn't doing any work because he doesn't hold the weight long enough. C. The athlete is doing work because he prevents the weight from falling downward. D. The athlete is doing work because 50 kilograms is a significant load to lift.
Answer:
A. The athlete isn't doing any work because he doesn't move the weight.
Explanation:
As we know that work done is defined as the product of force and displacement of the object in the direction of the force
so here we can say
[tex]W = F d cos\theta[/tex]
now we know that here force is applied by the athlete to hold the mass but the mass is steady at its position
The mass is not moving so we can say that
[tex]d = 0[/tex]
so the work done by the athlete will be zero
so correct answer is
A. The athlete isn't doing any work because he doesn't move the weight.
If a substance is in the gas phase, which of qualities of the gas will stay constant?
A: volume
B: mass
C: shape
D: position of particles
Answer:
Mass will remain constant...
Explanation:
All will change but not mass in gas phase...
How far did lewis and clark travel round trip
Answer:
8,000 miles and for 2 years
Explanation:
from May 14, 1804, to September 23, 1806, from St. Louis, Missouri, to the Pacific Ocean and back Lewis and Clark traveled. They traveled nearly 8,000 miles (13,000 km). There expedition was called Corps of Discovery.
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Due to alcohol's effect on your sense of balance, you may
A. Be unaware when you're driving on a hill
B. Feel like you're falling
C. Make unnecessarily wide gestures
Final answer:
Alcohol's effect on the sense of balance can make you feel like you're falling by disturbing the brain's ability to coordinate movements, which is crucial when planning to drive or operate machinery.
Explanation:
Due to alcohol's effect on your sense of balance, you may Feel like you're falling. Alcohol affects the cerebellum, a part of the brain that helps coordinate movements and balance. When alcohol enters the system, it disturbs the delicate balance between the motor command from the primary motor cortex to the proprioceptive and vestibular sensory feedback. This disturbance causes difficulties in maintaining balance, making activities such as walking in a straight line challenging.
It directly affects how we perceive our orientation in space, leading to a sensation of falling or instability. This effect on balance is especially problematic when planning to drive, operate machinery, or engage in activities requiring coordination and alertness. Furthermore, the consumption of alcohol, even in moderate amounts, can significantly impair driving performance and other activities requiring fine motor skills and cognitive function.
What does the atomic mass of an atom tell us?
How much the atom weighs
The number of electrons in the atom
Which row the element is in on the periodic table
The number of energy levels in the atom
"The atomic mass of an atom tells us the mass of an atom relative to carbon-12, which is assigned a mass of exactly 12 atomic mass units (amu). It is approximately equal to the sum of the number of protons and neutrons in the nucleus of an atom. The correct answer to the question is: How much the atom weighs.
The atomic mass is a measure of the mass of a single atom, and it is useful for comparing the masses of different atoms. It is important to note that the atomic mass is not an absolute measure of mass, but a relative one, based on the carbon-12 standard. The atomic mass listed on the periodic table for a given element is the weighted average of the masses of all the naturally occurring isotopes of that element.
To clarify the other options: - The number of electrons in the atom: This is indicated by the atomic number, not the atomic mass. The atomic number is the number of protons in the nucleus of an atom, and for a neutral atom, it is also equal to the number of electrons.
- Which row the element is in on the periodic table: The period (row) in which an element is located on the periodic table is determined by the number of electron shells or energy levels in the atom. This is related to the atomic number, not the atomic mass.
- The number of energy levels in the atom: Similar to the period in which an element is located, the number of energy levels (or electron shells) is also determined by the atomic number and not the atomic mass. The electron configuration of an atom, which is related to its position in the periodic table, dictates the number of energy levels."
An electrically isolated object is electrically neutral. What is the charge on the object if you remove three electrons?
Answer:
[tex]+4.8\cdot 10^{-19}C[/tex]
Explanation:
The initial charge of the object is zero, since the object is neutral:
Q = 0
When we remove three electrons, we remove a charge of:
[tex]q' = 3 \cdot q_e[/tex]
where
[tex]q_e = 1.6\cdot 10^{-19}C[/tex] is the charge of one electron. Substituting,
[tex]q'=3 \cdot 1.6\cdot 10^{-19}C=-4.8\cdot 10^{-19} C[/tex]
So, the final charge on the initially neutral object will be
[tex]q=Q-q' = 0 - (-4.8\cdot 10^{-19} C)=+4.8\cdot 10^{-19}C[/tex]
The force of gravity on an object varies directly with its mass. The constant of variation due to gravity is 32.2 feet per second squared. Which equation represents F, the force on an object due to gravity according to m, the object’s mass?F = 16.1mF =F = 32.2mF =
Explanation:
According Newton's 2nd Law of Motion the force [tex]F[/tex] is directly proportional to the mass [tex]m[/tex] and to the acceleration [tex]a[/tex] of a body:
[tex]F=m.a[/tex] (1)
When we talk about the force of gravity on an object (the weight) the constant acceleration is due gravity, this means:
[tex]a=g=32.2ft/s^{2}[/tex] (2)
Substituting (2) in (1):
[tex]F=m(32.2ft/s^{2})[/tex] (3)
This means the equation that best represents the force on an object due to gravity according to its mass, among the given options is:
[tex]F=32.2m[/tex]
When the temperature of an ideal gas is increased, what happens to its pressure?
Explanation:
The expression for an Ideal Gas is:
[tex]P.V=n.R.T[/tex]
Where:
[tex]P[/tex] is the pressure of the gas
[tex]n[/tex] the number of moles of gas
[tex]R[/tex] is the gas constant
[tex]T[/tex] is the absolute temperature of the gas
As we can see, there is a direct proportional relation between the temperature and the pressure, which means that if the temperature increases the pressure of the gas increases as well.
Does current flow through or across a resistor?
Answer:
Current flows across a resistor.
Explanation:
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It's not exactly clear what you think the difference is between "through" and "across".
A resistor has two wires. Electric current that flows into one wire, continues through the entire body of the resistor and out through the other wire. If there's a crack or break anywhere along the body of the resistor, the circuit will be 'open' and the current will stop flowing.
Now, if you were to connect a voltmeter between the ends of the resistor, the meter would measure and indicate the difference in electric potential between those two points. That would be called the voltage 'across' the resistor. Numerically, it would be equal to the product of the resistor's resistance and the current through it.
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Answer:
C
Explanation:
Resistivity of a material is the resistance of a cm long sample of the material of 1 cm2 cross-sectional area.
Yes the formula of resistivity is:
[tex]R=\dfrac{\rho l}{A}[/tex]
Where [tex]\rho[/tex] is relativistic resistance with units [tex]\dfrac{\Omega}{m}[/tex], each metal has different relativistic resistance you must find the relativistic resistance of your material using the table of relativistic resistances.
[tex]l[/tex] stands for the length of a wire.
[tex]A[/tex] stands for the area of the wire. Usually it is equal to [tex]\pi r^2[/tex] because.
So now we have data [tex]A=1cm^2[/tex] but nothing else was specified so we are unable to calculate anything.
Hope this helps.
r3t40
Answer:
Your answer is going to be 1 cm.
Explanation:
Two Earth satellites, A and B, each of mass m, are to be launched into circular orbits about Earth's center. Satellite A is to orbit at an altitude of 6380 km. Satellite B is to orbit at an altitude of 22700 km. The radius of Earth REis 6370 km. (a) What is the ratio of the potential energy of satellite B to that of satellite A, in orbit? (b) What is the ratio of the kinetic energy of satellite B to that of satellite A, in orbit? (c) Which satellite (answer A or B) has the greater total energy if each has a mass of 35.0 kg? (d) By how much?
(a) 0.439
The potential energy of a satellite in orbit is given by
[tex]U=-\frac{GmM}{R+h}[/tex]
where
G is the gravitational constant
m is the mass of the satellite
M is the mass of the Earth
R is the Earth's radius
h is the altitude of the satellite
If we call
[tex]U_A=-\frac{GmM}{R+h_A}[/tex]
the potential energy of satellite A, with
[tex]h_A = 6380 km = 6.38\cdot 10^6 m[/tex]
being its altitude, and
[tex]U_B=-\frac{GmM}{R+h_B}[/tex]
the potential energy of satellite B, with
[tex]h_B = 22700 km = 22.7\cdot 10^6 m[/tex]
being the altitude of satellite B
and
[tex]R=6370 km = 6.37 \cdot 10^6 m[/tex] being the Earth's radius
The ratio between the potential energy of satellite B to that of satellite A will be
[tex]\frac{U_B}{U_A}=\frac{R+h_A}{R+h_B}=\frac{6.37\cdot 10^6 m+6.38\cdot 10^6 m}{6.37\cdot 10^6 m+22.7\cdot 10^6 m}=0.439[/tex]
(b) 0.439
The kinetic energy of a satellite in orbit has a similar expression to the potential energy
[tex]K=\frac{1}{2} \frac{GmM}{R+h}[/tex]
As before, if we call
[tex]K_A=\frac{1}{2} \frac{GmM}{R+h_A}[/tex]
the kinetic energy of satellite A, with
[tex]h_A = 6380 km = 6.38\cdot 10^6 m[/tex]
being its altitude, and
[tex]K_B=\frac{1}{2} \frac{GmM}{R+h_B}[/tex]
the kinetic energy of satellite B, with
[tex]h_B = 22700 km = 22.7\cdot 10^6 m[/tex]
being the altitude of satellite B,
the ratio between the kinetic energy of satellite B to that of satellite A is
[tex]\frac{K_B}{K_A}=\frac{R+h_A}{R+h_B}=\frac{6.37\cdot 10^6 m+6.38\cdot 10^6 m}{6.37\cdot 10^6 m+22.7\cdot 10^6 m}=0.439[/tex]
(c) Satellite B
The total energy of each satellite is given by the sum of the potential energy and the kinetic energy:
[tex]E= U+K = -\frac{GMm}{R+h}+\frac{1}{2} \frac{GMm}{R+h}=-\frac{1}{2}\frac{GMm}{R+h}[/tex]
For satellite A we have:
[tex]E_A = -\frac{1}{2}\frac{GMm}{R+h_A}[/tex]
While for satellite B we have
[tex]E_B = -\frac{1}{2}\frac{GMm}{R+h_B}[/tex]
We see that the total energy is inversely proportional to the altitude of the satellite: therefore, the higher the satellite, the smaller the energy. So, satellite A will have the greater total energy (in magnitude), since [tex]h_A < h_B[/tex]; however, the value of the total energy is negative, so actually satellite B will have a greater energy than satellite A.
(d) [tex]3.07\cdot 10^8 J[/tex]
The total energy of satellite A is
[tex]E_A = -\frac{1}{2}\frac{GMm}{R+h_A}[/tex]
with
[tex]h_A = 6380 km = 6.38\cdot 10^6 m[/tex]
while the total energy of satellite B is
[tex]E_B = -\frac{1}{2}\frac{GMm}{R+h_B}[/tex]
with
[tex]h_B = 22700 km = 22.7\cdot 10^6 m[/tex]
So the difference between the two energies is
[tex]E_B - E_A = -\frac{1}{2}\frac{(6.67\cdot 10^{-11}(35 kg)(5.98\cdot 10^{24} kg)}{6.37\cdot 10^6 m +22.7\cdot 10^6 m}-(-\frac{1}{2}\frac{(6.67\cdot 10^{-11}(35 kg)(5.98\cdot 10^{24} kg)}{6.37\cdot 10^6 m +6.38\cdot 10^6 m})=3.07\cdot 10^8 J[/tex]
When two point charges are a distance d part, the electric force that each one feels from the other has magnitude F. In order to make this force twice as strong, the distance would have to be changed to
A) 2d
B) d/2
C) sqrt2*d
D) d/4
E) d/sqrt2
Answer:
E) d/sqrt2
Explanation:
The initial electric force between the two charge is given by:
[tex]F=k\frac{q_1 q_2}{d^2}[/tex]
where
k is the Coulomb's constant
q1, q2 are the two charges
d is the separation between the two charges
We can also rewrite it as
[tex]d=\sqrt{k\frac{q_1 q_2}{F}}[/tex]
So if we want to make the force F twice as strong,
F' = 2F
the new distance between the charges would be
[tex]d'=\sqrt{k\frac{q_1 q_2}{(2F)}}=\frac{1}{\sqrt{2}}\sqrt{k\frac{q_1 q_2}{(2F)}}=\frac{d}{\sqrt{2}}[/tex]
so the correct option is E.
All atoms of the same element must have the same number of
Answer: Protons
Explanation: The number of protons corresponds to the atomic number.
Explanation:
Atomic number is defined as the total number of protons present in an element.
Each element of the periodic table has different atomic number because each of them have different number of protons.
For example, atomic number of Na is 11, and atomic number of Ca is 20.
On the other hand, atomic mass is the sum of total number of protons and neutrons present in an atom.
For example, atomic mass of nitrogen is 14 that is, it contains 7 protons and 7 neutrons.
Thus, we can conclude that all atoms of the same element must have the same number of protons.
Relationship between electricity and magnetism
The frequency of the middle c note on a piano is 261.63 hz. What is the wavelength of this note in centimeters? The speed of sound in air is 343.06 m/s.
Answer:
1.31 m
Explanation:
The relationship between frequency and wavelength of a sound wave is
[tex]c=f \lambda[/tex]
where
c is the speed of the wave
f is the frequency
[tex]\lambda[/tex] is the wavelenfth
In this problem, we have
c = 343.06 m/s
f = 261.63 Hz
So we can solve the formula for the wavelength:
[tex]\lambda=\frac{c}{f}=\frac{343.06 m/s}{261.63 Hz}=1.31 m[/tex]
Wavelength of the note of the piano is the ratio of speed of sound to its frequency. The wavelength of the note is centimeters is 131 centimeters.
What is wavelength of a wave?Wavelength of a wave is the distance between the two consecutive crest or the thrust of that wave. The wavelength of the wave is represented with the Greek latter lambda (λ).
The wavelength of the wave can be given as,
[tex]\lambda=\dfrac{v}{f}[/tex]
Here, (v) is the speed of wave and (f) is the frequency of the wave.
It is given that, the frequency of the middle c note on a piano is 261.63 hz.
As the speed of sound in air is 343.06 meter per second. Thus put the values of the known variables in the above formula to find the wavelength of the note as,
[tex]\lambda=\dfrac{343.06}{261.63}\\\lambda=1.31\rm m[/tex]
The wavelength of this note in centimeters is 131 centimeters.
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What percentage of a lower trophic level's energy flows to the next higher trophic level? A. 1% b. 10% c. 50% d. 100% Please select the best answer from the choices provided A B C D
Answer:
The answer is B; 10%
10 percentage of a lower trophic level's energy flows to the next higher trophic level.
What is meant by trophic level ?The trophic level is defined as the different levels in a food chain or the ecosystem, that consists of the organisms that are having the same functions in the food chain.
Here,
In each trophic levels, the organisms will be having the same nutritional relationship with their primary source of energy in the food chain.
There is a law regarding the energy transfer between the various trophic levels. It is known as the 10% law.
According to the 10% law, a 10 percentage of the energy from each of the lower trophic level is transferred to their higher levels in a food chain.
Even though some amount of energy is lost in the form of heat in the food chain.
Hence,
10 percentage of a lower trophic level's energy flows to the next higher trophic level.
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Which atomic model was proposed as a result of j. J. Thomson’s work?
Explanation:
During the 19th century the accepted atomic model, was Dalton's atomic model, which postulated the atom was an "individible and indestructible mass".
However, at the end of 19th century J.J. Thomson began experimenting with cathode ray tubes and found out that atoms contain small subatomic particles with a negative charge (later called electrons). This meant the atom was not indivisible as Dalton proposed. So, Thomson developed a new atomic model.
Taking into consideration that at that time there was still no evidence of the atom nucleus, Thomson thought the electrons (with negative charge) were immersed in the atom of positive charge that counteracted the negative charge of the electrons. Just like the raisins embedded in a pudding or bread.
That is why this model was called the raisin pudding atomic model.
Which of the following quantities have the dimensions of a speed?
(1)at (2)at^2 (3) (2ax)^(1/2) (4)((2x)/a)^(1/2)
Dimension of speed =
Other dimension =
Answer:
(1) and (3)
Explanation:
Speed has dimensions of:
m/s (meters per second)
While:
a (acceleration) has dimensions of [tex]m/s^2[/tex]
t (time) has dimensions of [tex]s[/tex]
Let's analyze each option:
(1)at
[tex](m/s^2) \cdot (s) = m/s[/tex] --> this has dimensions of speed
(2)at^2
[tex](m/s^2) \cdot (s)^2 = m[/tex] --> this has dimensions of distance
(3) (2ax)^(1/2)
[tex]\sqrt{(m/s^2)\cdot (m)}=m/s[/tex] --> this has dimensions of speed
(4) ((2x)/a)^(1/2)
[tex]\sqrt{\frac{m}{m/s^2}}=s[/tex] --> this has dimensions of time
So choices (1) and (3) are correct.
The quantities at and (2ax)^(1/2) have dimensions of speed because both, when calculated dimensionally, result in L/T or LT^-1, which is the dimensional representation of speed.
Explanation:The question is asking which of the given quantities have dimensions that could represent speed. The dimension of speed is given by L/T or LT-1, which means length divided by time. Speed itself is defined as the distance traveled over time, or ds/dt. Given that the dimensions provided for s (displacement) are [s] = L, and the dimensions of t (time) are [t] = T, any quantity that has dimensions of L multiplied or divided by T to the power of 1 is dimensionally equivalent to speed.
Using this information, we can analyze the given quantities:
at: Given [a] = LT-2 and [t] = T, at does have dimensions of L, but since [at] = LT-2T = LT-1, it represents speed.at2: Given [a] = LT-2 and [t2] = T2, at2 has dimensions L, but since [at2] = LT-2T2 = LT, it does not represent speed.(2ax)1/2: Given [a] = LT-2 and [x] = L, (2ax) has dimensions L2T-2, so [(2ax)1/2] = (L2T-2)1/2 = LT-1, which represents speed.((2x)/a)1/2: Given [x] = L and [a] = LT-2, (2x/a) has dimensions T2, so [((2x)/a)1/2] = (T2)1/2 = T, which does not represent speed.Therefore, the quantities that have dimensions of a speed are at and (2ax)1/2.
A balloon was filled to a volume of 2.50 l when the temperature was 30.0∘c. What would the volume become if the temperature dropped to 11.0∘c.
Answer:
2.34 L
Explanation:
Assuming the pressure inside the balloon remains constant, then we can use Charle's law, which states that for a gas kept at constant pressure, the ratio between the volume of the gas and its temperature remainst constant:
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]
where in this problem we have:
[tex]V_1 = 2.50 L[/tex] is the initial volume
[tex]V_2 [/tex] is the final volume
[tex]T_1 = 30.0^{\circ}C+273 = 303 K[/tex] is the initial temperature
[tex]T_2 = 11.0^{\circ}C+273 = 284 K[/tex] is the final temperature
Substituting into the equation and solving for V2, we find the final volume:
[tex]V_2 = \frac{V_1 T_2}{T_1}=\frac{(2.50 L)(284 K)}{303 K}=2.34 L[/tex]
Final answer:
The volume of a balloon filled to 2.50 L at 30.0°C will decrease to approximately 2.34 L when the temperature drops to 11.0°C, as calculated using Charles's Law.
Explanation:
To determine the new volume of a balloon when the temperature drops from 30.0°C to 11.0°C, we can use Charles's Law which states that the volume of a gas is directly proportional to its temperature in kelvins. First, we convert the temperatures from Celsius to Kelvin by adding 273.15:
Initial temperature (T1) = 30.0°C = 303.15 KFinal temperature (T2) = 11.0°C = 284.15 KWith an initial volume (V1) of 2.50 L, we can set up the proportionality:
V1/T1 = V2/T2
Solving for the new volume (V2):
V2 = V1 · (T2/T1)
V2 = 2.50 L · (284.15 K / 303.15 K)
V2 = 2.50 L · 0.9373
V2 ≈ 2.34 L
The volume of the balloon will decrease to approximately 2.34 L when the temperature drops to 11.0°C.
You are driving on an Interstate highway in bad weather, and you do not feel safe at the speed limit. You should A: Follow closely behind a large truck. It will shield you from the weather. B: Slow down to the speed that allows you to have complete control of your vehicle. C: Always drive the same speed as other vehicles, even if it feels unsafe.
Answer:
B. Slow down to the speed that allows you to have complete control of your vehicle.
Explanation:
Your life is very important, and driving at the same speed as others or even closely behind could endanger your life. Being directly behind someone else, if they stop immediately you will hit them because you can't stop fast enough. If something feels unsafe never continue doing it.
Answer:
B. slow down to the speed that allows you to h ave complete control of your vehicle.
Explanation:
You can also reduce the risk of external factors by slowing down and keeping a safe distance from the vehicle in front of you.
According to classical physics what should happen as a filament in a light bulb gets hotter?
Answer:
it should give off light of increasing energy from red to violet and than into ultra violate
Explanation:
A filament in a light bulb gets hotter as B.it should give off light of increasing energy from red to violet and than into ultra violate.
Why does the filament get hot?
A typical light bulb contains a thin wire (usual tungsten) called a filament, which has a high electrical resistance. This filament becomes very hot when an electric current flows through it. Due to the high temperature, the filament shines brightly.
Incandescent lamps are common incandescent lamps. It contains a thin coil of wire called a filament. When an electric current flows, it gets hot and emits light. The resistance of the lamp increases as the temperature of the filament rises.
Filament temperatures are very high, usually above 2,000 ºC or 3,600 ºF. For a "standard" 60, 75, or 100-watt bulb, the filament temperature is about 2,550 ºC or about 4,600 ºF. At such high temperatures, the heat radiation from the filament contains a significant amount of visible light.
Learn more about filament here: https://brainly.com/question/1874336
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How do I solve this question?
Explanation:
You can solve this with kinematics or with energy. It looks like you want to use energy.
Energy is conserved, so:
initial energy = final energy
Kinetic energy = potential energy
1/2 m v² = m g h
1/2 v² = g h
h = v² / (2g)
If we double the velocity:
H = (2v)² / (2g)
H = 4v² / (2g)
H = 4h
So the new height is 4h.