Electrons have a charge of q = -1.602 × 10^-19 c. a student observes that a styrofoam cup has a total charge of q = -0.53 μc.
Write an expression for the number of excess electrons N in the cup.
Answers
The expression for the number of excess electrons N in the cup is N = 3.31 × 10¹².
Why is number excess electrons N in the cup = 3.31 × 10¹²?The charge on a single electron is -1.602 × 10⁻¹⁹ C.
As per the question, a student observes that a styrofoam cup has a total charge of q = -0.53 μC.So, for calculating the number of excess electrons N in the cup, we will use the formula:
N = (total charge) / (charge per electron)
As we know, q = -0.53 μC = -0.53 × 10⁻⁶ C
And, the charge on a single electron is q = -1.602 × 10⁻¹⁹ CSo, putting these values in the formula,
we get:
N = (-0.53 × 10⁻⁶) / (-1.602 × 10⁻¹⁹)= 3.31 × 10¹²
So, the expression for the number of excess electrons N in the cup is N = 3.31 × 10¹².
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Related Questions
Describe the net transfer of thermal energy and any changes in temperature When a metal block at 300Ak is placed in water at 15°C
Answers
Answer:
Q_c = Q_abs
Explanation:
You are asked to describe the process when placing a hot block in cold water.
The first thing to do is put all the quantities in the same units
block temperature T_bloque = T_h = 300 K = 300 -273 = 27ºC
water temperature T_water = T_c = 15ºC
* initially the block cools down decreasing its temperature
* the water temperature increases
* the equilibrium is established when the thermal energy of the two bodies is equal, therefore they have the same temperatures T_f
* Conservation of energy requires that the energy released by the hot block is equal to the energy absorbed by the cold body (water)
transferred thermal energy Q_c = m_block ce_block (T_h-T_f)
absorbed thermal energy Q_abs = m_agua ce_agua (T_f - T_c)
* if we subtract the energy transferred and the absorbed gives zero, therefore the net energy transferred is zero
Q_c = Q_abs
A friction factor is dimensionless wall shear stress
T/F
Answers
True, a friction factor is a dimensionless wall shear stress.
The friction factor is used to quantify the resistance caused by friction in a fluid flow system, such as a pipe. It is defined as the ratio of the wall shear stress to the dynamic pressure of the fluid.
The wall shear stress represents the force of friction acting on the fluid as it flows along a surface, while the dynamic pressure represents the kinetic energy per unit volume of the fluid.
By dividing the wall shear stress by the dynamic pressure, we obtain a dimensionless value that can be used to compare the effects of friction in different flow systems.
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what is happening when two waves with identical crests and troughs meet?
Answers
Answer:
When two waves meet in such a way that their crests line up together, then it's called constructive interference. The resulting wave has a higher amplitude. In destructive interference, the crest of one wave meets the trough of another, and the result is a lower total amplitude.
The half-life of iodine-131 is 8.07 days. If 0.25 g are left after 40.35 days, how many gramswere in the original sample?
Answers
Given data
*The half-life of iodine-131 is t = 8.07 days
*The amount of quantity left is N = 0.25 g
*The number of days is T = 40.35 days
The expression for the radioactivity decay is given as
\(N=N_0(\frac{1}{2})^{\frac{T}{t}}\)Substitute the values in the above expression as
\(\begin{gathered} \text{0}.25=N_0(\frac{1}{2})^{\frac{40.35}{8.07}} \\ N_0=8\text{ g} \end{gathered}\)Answer:
See below
Explanation:
40.35 days / (8.07 day per half life) = 5 half lives
.25 = x ( 1/2)^5
.25 / ( 1/2)^5 = x = 8 gm originally
what is the skydivers acceleration
Answers
Biological fluid mechanics, please answer all questions or at
least as much as possible
(a) The governing principles in fluid mechanics are described analyticaly by the conservation laws for mass, momentum, and energy. These can be stated either in integral form when applied to an extend
Answers
Biological fluid mechanics is a rapidly growing field of study that uses the principles of fluid mechanics to understand the behavior of fluids in biological systems. This includes the study of blood flow, mucus transport, and the swimming of microorganisms.
The field is essential for understanding the functioning of many biological systems and has led to new insights into the behavior of living organisms.
Biological fluid mechanics is a multidisciplinary field that draws on the expertise of engineers, physicists, biologists, and mathematicians.
As the field continues to develop, we can expect to see new applications in fields such as medicine, environmental science, and robotics.
Here are some of the specific applications of biological fluid mechanics:
Medicine: Biofluid mechanics can be used to design new medical devices, such as artificial heart valves and catheters.
Environmental science: Biofluid mechanics can be used to understand the transport of pollutants in water and air.
Robotics: Biofluid mechanics can be used to design robots that can swim or fly like animals.
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Step 1 of 2: If we ignore air resistance, a falling body will fall 16t^2 feet in t seconds. How far will it fall between t= 3 and t=3.2?
Answers
Given data:
* The equation of the distance traveled by the body in terms of time is,
\(d=16t^2\)Solution:
The distance traveled by the body in time t = 3 s is,
\(\begin{gathered} d(3)=16\times(3)^2^{} \\ d(3)=144\text{ ft} \end{gathered}\)The distance traveled by the body in time t = 3.2 s is,
\(\begin{gathered} d(3.2)=16\times3.2^2 \\ d(3.2)=163.84_{}\text{ ft} \end{gathered}\)Thus, the distance traveled between t = 3 s and t = 3.2 s is,
\(\begin{gathered} d(3.2)-d(3)=163.84-144 \\ d(3.2)-d(3)=19.84ft_{} \end{gathered}\)Thus, the body falls 19.84 ft or approx 20 ft in between 3 s and 3.2 s.
What is the method of heat transfer sunlight melts a wax crayon left outside.
Answers
Answer:
Hey Friend....
Explanation:
This is ur answer....
Transfer of energy by electromagnetic waves. Radiation doesn't require matter. Sunlight melting a wax crayon left outside is radiation.Hope it helps!
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Match the measurement with the prober SI unit.
Answers
Answer:
Your question is incomplete
Answer: acceleration meters by second squared velocity meters per second distance meters
Explanation:
Give a few examples/ applications of the universal law of gravitation
Answers
Answer: 1) It keeps us on the earth so that we can live on the earth and not flying someone else in the atmosphere and space. 2) It maintains the motion of motion of all the planets around the sun and moon around the earth. 3) It pulls all the object towards the earth. 4) The flowing of water in the rivers and seas.
Explanation:
PLEASE HELP ASAP NO LINKS
Answers
Answer:
Fourth harmonic
Explanation:
As you can see each of the waves altitudes appear to be equivalent within both the crest and trough. Not only that but the wavelengths as well appear to be exactly similar. Therefore, providing me with the estimation of fourth harmonic.
9. Thermal energy (heat) is defined as
A. the sum of all the kinetic energies of all the particles in an object
B. the average of all the kinetic energies of all the particles in an object
C. the sum of all the numbers of particles in an object
D. the average number of particles in an object
Answers
Answer:
The correct answer is A. Thermal energy (heat) is defined as the sum of all the kinetic energies of all the particles in an object.
What are 5 different ways to use a fidget spinner?
Answers
Answer:
Balancing on one finger.
Tossing between hands.
Using a different body part.
Building a tower.
Throwing it high in the air.
Flipping it over.
Switching between fingers.
Going behind the back.
Explanation:
Just stuff I used to do ^^
A particle starts from rest and moves with a constant acceleration of 0.5m/s . Calculate the time taken by the particle to cover a distance of 25m
Answers
Answer:
t=10s
Explanation:
Use equation d=v1*t + 1/2a*t^2
Now rearrange for t
We also know that v1 is zero so that part v1*t will be canceled since its zero
d= 1/2 *a*t^2
dx2=at^2
d*2/a=t^2
^1/2 means square root
(d*2/a)^1/2 = t
Now plug in values
(2x25m/0.5m/s^2) ^1/2= t
(50/0.5)^1/2=t
(100)^1/2=t
+10s, -10=t
we will take +10s ofc.
an astronaut has a mass of 150 kg on earth. what would be the mass of the astronaut on the moon.
Answers
Answer:
Weight On the Moon: 24.80 kilograms
Now the king had a grand-vizir who was avaricious, and envious, and a very bad man. He grew extremely jealous of the physician, and determined to bring about his ruin.
In order to do this he asked to speak in private with the king, saying that he had a most important communication to make.
"What is it?" asked the king.
"Sire," answered the grand-vizir, "it is most dangerous for a monarch to confide in a man whose faithfulness is not proved. You do not know that this physician is not a traitor come here to assassinate you."
–“The Story of the Greek King and the Physician Douban,”
Andrew Lang
What inferences can be made about the grand-vizir’s motivations for speaking with the king in private? Check all that apply.
Answers
Answer:
its 1 and 5, A and E
Explanation:
[OU.04]Two stars, Star 1 and Star 2, are at almost equal distances from Earth. The table below shows the masses of the two stars.
Name of Star Mass of Star (in million solar masses)
Star 1 3.61
Star 2 11.73
I am lost on this question HELP
Which of these statements is most likely correct about the stars?
Earth exerts a greater gravitation force on Star 1 than on Star 2.
Earth exerts a greater gravitation force on Star 2 than on Star 1.
Star 1 attracts Star 2 with a greater gravitational force than Star 2 attracts Star 1.
Star 2 attracts Star 1 with a greater gravitational force than Star 1 attracts Star 2.
Answers
Answer: Which of these statements is most likely correct about the stars?
Star 2 attracts Star 1 with a greater gravitational force than Star 1 attracts Star 2.
No, because Third Newton Law states that both forces are equal in magnitude.
Earth exerts almost equal gravitation force on both the stars.
No, because the Universal Gravitational Law, estblished by Newton, states the atraction force to two masses is proportional to the product of the masses.
Star 1 attracts Star 2 with a greater gravitational force than Star 2 attracts Star 1.
No (same reason for the first statement)
Earth exerts greater gravitation force on Star 2 than on Star 1.
Right. This is the correct statement. Given the mass of Star 2 is greater than the mass of Star 1, by the Universal Gravitational Law, the earth exerts greater gravitational attraction on Star 2.
Explanation:
:)
A piece of iron has a density of 7.86 g/cm3 and a mass of 1.09 x 10^-1 kg. Calculate the volume of the piece of iron.
Answers
1.00 cm3 lead x 11.4 g/cm3 = 11.4 g lead on one side of balance
To balance that, one needs 11.4 g of iron on the other pan. Calculate volume of iron to give you 11.4 g:
11.4 g iron x 1 cm3/7.87 g = 1.45 cm3 of iron needed
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asteroid 2004 fh passed within a tenth of the earth-moon distance in march 2004. when its period was found to be about nine months, it was classified as a(n):
Answers
NEOs, or Near-Earth Objects, refer to asteroids and comets that have orbits that bring them close to Earth. These objects are of great interest to scientists and astronomers due to the potential threat they pose to our planet in the event of a collision. NEOs can be composed of rock, metal, ice, and dust, depending on whether they are asteroids or comets.
Asteroid 2004 FH, which passed within a tenth of the Earth-Moon distance in March 2004, was classified as a NEO. Its classification was based on the discovery that its period, or the time it takes to complete one orbit around the Sun, was about nine months. This close encounter with Earth and its relatively short period made it fall under the category of NEO.
NEOs are further classified into different groups based on their orbits. These classifications include Atens, Apollos, and Amors. Atens have orbits that primarily fall within the orbit of Earth, Apollos have orbits that cross Earth's orbit, and Amors have orbits that are mostly outside Earth's orbit but can still come close to our planet.
Studying NEOs is crucial for understanding the dynamics of our solar system and for developing strategies to mitigate potential asteroid impacts on Earth.
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two different r resistors in parallel always have the same ____________; two resistors in series always have the same ______________.
Answers
Answer:two different r resistors in parallel always have the same U; two resistors in series always have the same I.
Explanation:
If two different r resistors in parallel always have the same voltage or potential difference across them and if two resistors in series always have the same electric current passing through them .
What is resistance?Resistance is the obstruction of electrons in an electrically conducting material .
The mathematical relation for resistance can be understood with the help of the empirical relation provided by Ohm's law .
V = I × R
The voltage is the same if the resistance is connected in a parallel arrangement .
The current is the same if the resistance is connected in a series arrangement .
Thus , If the voltage or potential difference across two separate resistors connected in parallel is always the same, as well as the electric current flowing through two resistors connected in series .
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Which of these is a good way to begin your personal helath plan for physical fitness A. An assessment B. An action plan C. A plan for measuring progress toward your goal D. An ambitious goal.
Answers
Answer: A. An Assessment
I hope this helps, and Happy Holidays! :)
ANSWER
A. An assessment
The frequency of a wave is 660 Hz its wavelength is .5 m calculate the period of the wave
Answers
Heya!!
For calculate period, lets applicate formula:
\(\boxed{T=1/f}\)
Δ Being Δ
T = Period = ?
f = Frequency = 660 Hz
⇒ Let's replace according the formula:
\(\boxed{T=1/660\ Hz }\)
⇒ Resolving
\(\boxed{T=0,0015\ s}\)
Result:
The period of that wave is 0,0015 seconds.
Δ IMPORTANT Δ
The period is the INVERSE of the frequency. (T = 1 / f).
And the frequency is the inverse of the period (f = 1 / T)
Good Luck!!
Please help me : What braking force is needed to stop a 1,000-kilogram car moving at 10m/s on a time of 1 seconds?
Answers
a 4.0 kg mass (m1) moving at 4.0 m/s collides with a stationary 8.0 kg mass (m2) at rest. if m1 moves at 2.0 m/s after the collision, what is the velocity of m2 after the collision?
Answers
The velocity of m2 after the collision is 1 m/s.
The conservation of momentum states that, inside some problem domain, the quantity of momentum remains regular; momentum is neither created nor destroyed, however, best changed via the motion of forces as described via Newton's legal guidelines of motion.
Calculation:-
Given,
mass 1 = 4 kg
v1 = 4 m/s
mass 2 = 8 kg
v2 = 0 stationary
final velocity V'1 = 2 m/s
Let the final velocity of V'2 =?
applying conservation of linear momentum
m1v1 + m2V2 = mV'1 + m2V'2
4× 4 + 8×0 = 4×2 + 8×V'2
16 = 8 +8V'2
V'2 = 8/8
= 1 m/s
The regulation of conservation of momentum states that in an isolated system the entire momentum of or more of our bodies performing upon each other remains steady until an outside pressure is implemented. therefore, momentum can neither be created nor destroyed.
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Which of these statements did you include in your answer? check all that apply the two main parts of an atom are the nucleus and the electron cloud. the three subatomic particles of an atom are protons, neutrons, and electron
Answers
Both given statements are true. An atom has a nucleus, an electron cloud, and subatomic particles.
There are two main parts of an atom i.e. nucleus (protons + neutrons) and the electron cloud which is composed of three subatomic particles: electrons, protons, and neutrons.
An electron is a subatomic particle having a negative charge on it.
While protons are positively charged particles and are found in the nucleus of an atom due to strong nuclear forces.
On the other hand, a neutron, as the name suggests, is a neutral subatomic particle having no charge at all.
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please answer and ill give brainliest
Answers
Answer:
12:00 A.M. (midnight)
Explanation:
If it is the middle of the night, not many people will use electricity because most people are sleeping
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What is the energy of a moving object?
Answers
Answer:
Kinetic Energy
Explanation:
1/2mv^2
n object rests on an inclined surface. If the inclination of the surface is made steeper, what does the normal force on the object do? A) increase B) decrease C) stays the same D) The normal force is zero. E) Cannot be determined without additional information.
Answers
When an object rests on an inclined surface, if the inclination of the surface is made steeper, the normal force on the object decreases. The normal force is the force exerted by a surface perpendicular to the object in contact.
It is perpendicular to the surface and prevents the object from falling through the surface.The normal force on an object is proportional to the weight of the object. The force is directly proportional to the weight of the object. As the inclination of the surface becomes steeper, the weight of the object along the inclined surface increases.The normal force decreases as the weight of the object increases. So, if the inclination of the surface is made steeper, the normal force on the object decreases.
Therefore, the correct option is B. decrease. Additional Information:In addition, a steeper inclination of the surface increases the force of gravity along the surface and decreases the perpendicular force exerted by the surface.
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A bullet is accelerated in the muzzle of a gun from rest to 150 m/s in 0.50sec. What is the acceleration?
Answers
Answer:
Bullets are cylindrical metal projectiles shot from firearms. Their main function is to kill or otherwise incapacitate. They come in numerous varieties for use in handguns, rifles, and machine guns. There is also special ammunition capable of penetrating armor, firing underwater, or firing "silently" at subsonic speeds. However, their designs are all basically the same. A typical cartridge consists of four components: the cartridge case, primer, propellant charge and bullet. When a gun trigger is pulled, the primer is struck, igniting the propellant. This causes a rapid expansion of gas, which forces the bullet forward and ejects the casing. Contrary to popular belief, guns are not loaded with bullets, but cartridges, and they fire bullets (since bullets are a more common term and the actual objects responsible for harm, they receive the recognition).
While small in size (the most popular handgun bullet is 9 mm in diameter) bullets posses enough kinetic energy to cause serious damage. Using a kinematics formula, it is possible to determine the acceleration of a bullet when the muzzle velocity and barrel length of a gun are known.
v2 = vo2 + 2as
Where
v is the muzzle velocity
vo is the initial velocity of the bullet, which is zero
a is the acceleration
s is the barrel length
Since acceleration is the desired value, the derived formula is this:
equation
When fired from a Beretta 92S, the standard issue US Army pistol, a 9 mm Parabellum bullet has a muzzle velocity of 335 m/s. With its 127 mm barrel length, the bullet's acceleration is calculated to be 4.4 × 105 m/s2.
The acceleration of a bullet depends largely on the gun from which it is fired, along with the intent of the user. Pistol bullets generally feature a lower acceleration than rifles or machine guns. Also, individuals involved with clandestine operations may use firearms with silencers, which suppress bullet speed and require special subsonic ammunition.
Remember, guns don't kill people. Bullets do. To paraphrase Chris Rock in Bigger, Blacker and Uncut, if bullet prices were raised to $5,000 each, there would be a drastic decrease in murders [mp3].
in thermodynamics we describe certain processes as "irreversible". from this perspective, which of the following generic process descriptions is thermodynamically irreversible?
Answers
From a thermodynamic perspective, the thermodynamically irreversible process description among the following options is: Heat transfer between two objects with the same temperature.
In thermodynamics, an irreversible process is characterized by the inability to return the system and its surroundings to their initial state without external intervention. It is associated with an increase in entropy and the dissipation of energy. In the case of heat transfer between two objects with the same temperature, there is no temperature difference to drive the transfer of heat. Consequently, no useful work can be extracted from this process, and it does not generate any change or increase in entropy. As a result, this process is considered thermodynamically reversible since it can be easily reversed without any net change in the system or surroundings.
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