Answer:
=9696.5J
Explanation:
The latent heat of fusion of a unit mass of copper is the heat released when it changes from its molten state to solid state of the heat absorbed to melt it.
The total energy released is calculated using MLf where M is the mass of the copper and Lf is the latent heat of fusion.
=mLf
=47.30 grams×205.0J/g
=9696.5J
Answer:
-9697
Explanation:
thats the answer
A motor with an operating resistance of 2.21 ohms is connected to a voltage source. The current in the circuit is 3.8 A and the power of the system is 32 watts. What is the voltage of the source?
The answer is:
The voltage of the source is 8.40 Volts.
Why?To solve the problem, we need to use the Ohm's Law equation, which states that:
[tex]Voltage(Volts)=Current(Amps)*Resistance(Ohm)[/tex]
From the statement we know that:
[tex]Resistance=2.21\Omega\\Power=32W\\Current=3.8A[/tex]
Now, substituting and calculating we have:
[tex]Voltage(Volts)=Current(Amps)*Resistance(Ohm)[/tex]
[tex]Voltage(Volts)=3.8A*2.21\Omega=8.40V[/tex]
Hence, we have that the voltage of the source is 8.40 Volts.
Have a nice day!
Which is NOT true about oxygen-17 and oxygen-18?
Answer:
Their atoms have identical mass.
Explanation:
Oxygen-17 and Oxygen-18 are both isotopes of Oxygen.
Oxygen has three isotopes, Oxygen- 16, Oxygen-17 and Oxygen-18.
Oxygen- 16 has 8 protons and 8 neutrons and a mass number of 16.
Oxygen-17 has 8 protons and 9 neutrons and a mass number of 17.
Oxygen-18 has 8 protons and 10 protons and a mass number of 18.
The three isotopes therefore have the same atomic number ( the number of protons) but different mass numbers.
_heat is the amount of heat required to change the temperature of 1 gram of a substance by 1°C, and it is related to the chemical composition of the substance.
Answer:
specific heat
Explanation:
Specific heat is the amount of heat required to change the temperature of 1 gram of a substance by 1°C, and it is related to the chemical composition of the substance
What object has no momentum?
- a bird flying north
- a car parked in a garage
- a satellite orbiting Earth
-a truck with constant speed
Answer:
a car parked in a garage
Explanation:
where would a parked car go ? its not even in motion lol
QUESTION 1
What is amperage?
is the rate of doing work.
is the rate of flow of protons in electric current.
represents the amount of pressure behind electron flow.
is the rate of flow of electrons in electric current.
2 points
QUESTION 2
What is Voltage?
is the rate of doing power.
represents the amount of pressure behind electron flow.
is the rate of doing work.
is the rate of flow of electrons in electric current.
2 points
QUESTION 3
What is Power?
is the rate of flow of protons in electric current.
is the rate of flow of electrons in electric current.
is the rate of doing work.
represents the amount of pressure behind electron flow.
2 points
QUESTION 4
If we multiply volts times amps we get what?
power
circuit
work
current
2 points
QUESTION 5
What are two ways alternating currents are similiar?
In both AC and DC electrons flow in the same pattern.
In both AC and DC, the flow of electrons changes directions back and forth.
Both AC and DC are only possible in certain materials with atoms that will allow electron flow.
Both AC and DC involve the flow of electrons.
4 points
QUESTION 6
How does the flow of electrons flow in an alternating current?
The flow of electrons is always slower in an alternating current than within a direct current.
The flow of electrons is not constant and forward; it changes direction back and forth.
Electrons flow from from a higher affinity to that of a lower affinity.
Electron flow is constant and only in a forward direction.
2 points
QUESTION 7
What is the flow like in a direct current?
The flow of electrons is not constant and forward; it changes direction back and forth.
The flow of electrons is constant and only in a forward direction.
The flow of electrons go from a higher affinity to a lower affinity.
The flow of electrons are always faster in a direct current.
2 points
QUESTION 8
How is an electric current able to flow?
Electrons flow from the higher affinity to lower affinity and electrical current is generated.
Protons flow from the higher affinity to lower affinity and electrical current is generated.
The movement of protons from one atom to another leads to an electric charge.
The movement of electrons from one atom to another atom in a line results in a flow of electric current.
2 points
QUESTION 9
How do electrons move from the two different types of metal in a battery?
Protons flow from the metal with the lower affinity to the metal with higher affinity and electrical current is generated.
Electrons flow from the metal with the lower affinity to the metal with higher affinity and electrical current is generated.
Electrons flow from the metal with the higher affinity to the metal with lower affinity and electrical current is generated.
Protons flow from the metal with the higher affinity to the metal with lower affinity and electrical current is generated.
Answer:
Question 1 : is the rate of flow of electrons in electric current.
Question 2: represents the amount of pressure behind electron flow
Question 3: is the rate of doing work
Question 4: Power
Question 5: Both AC and DC are only possible in certain materials with atoms that will allow electron flow.
Both AC and DC involve the flow of electrons.
Question 6: The flow of electrons is not constant and forward; it changes direction back and forth.
Question 7: The flow of electrons is constant and only in a forward direction.
Question 8: The movement of electrons from one atom to another atom in a line results in a flow of electric current.
Question 9: Electrons flow from the metal with the lower affinity to the metal with higher affinity and electrical current is generated.
which symbol in the first law of thermodynamics represents the sum of the chemical and thermal energy stored in atoms and molecules?
a. Q
b.W
c.V
d.U
Answer:
U
Explanation:
The first law of thermodynamics states that:
[tex]\Delta U = Q-W[/tex]
where
U is the internal energy of the gas, which represents the sum of the chemical and thermal energy stored in the atoms and molecules of the gas
[tex]\Delta U[/tex] represents the variation of internal energy
Q is the heat absorbed by the system
W is the work done by the system
So, the sum of the chemical and thermal energy stored in atoms and molecules is represented by U, the internal energy.
Answer:
U APEX
Explanation:
What type of circuit is illustrated?
A.closed parallel circuit
B.Closed series circuit
C.open series circuit
D.Open parallel circuit
Answer:
I beleive its B
Explanation:
If not then A but I'm positive its B
Which of Hubble’s discovery support the Big Bang theory
Answer:
there are no mutiple choices
Answer:
Redshift increases with distance
Explanation:
Edwin Hubble discovered a relation for distance and radial velocities of galactic nebulae from their redshifts i.e., when an object is moving away from earth the wavelength of light gets changed due to the Doppler effect.
He also found that two galaxies when further apart have a greater speed by which they are moving away from each other. This was used to prove the Big Bang theory laid down by Georges Lemaître.
5/6 - 1/3 sorry for add part i was meant to do minus but tell me what it is?
Answer:
[tex]\frac{1}{2}[/tex]
Explanation:
[tex]\frac{5}{6} -\frac{1}{3} = \frac{15}{18} -\frac{6}{18}=\frac{9}{18} =\frac{1}{2}[/tex]
Answer:
1/2
Explanation:
we will take the LCM of denominators with is LCM (6,3)=6.
Now we shall make denominators equal no both sides. Since 5/6 already has 6 as denominator we shall multiply 2 with 3 to make denominators equal in 1/3 and so we also multiply 1 with 2. we get
1/3 × 1/2= 1/6 ×2/1=2/6
now 5/6-2/6=3/6=1/2
john throws .4 kg ball with velocity of 18 m/s. Hits .2 kg bottle and bottle flies 25 m/s. How fast is ball traveling after hitting the bottle?
Answer:
5.5 m/s
Explanation:
Assuming the bottle is initially stationary, we can write the law of conservation of momentum as follows:
[tex]p_i = p_f\\m_b u_b = m_b v_b + m_B v_B[/tex]
where
[tex]m_b = 0.4 kg[/tex] is the mass of the ball
[tex]u_b = 18 m/s[/tex] is the initial velocity of the ball
[tex]m_B = 0.2 kg[/tex] is the mass of the bottle
[tex]v_B = 25 m/s[/tex] is the final velocity of the bottle
[tex]v_b[/tex] is the final velocity of the ball
Solving for [tex]v_b[/tex],
[tex]v_b = \frac{m_b u_b - m_B v_B}{m_b}=\frac{(0.4 kg)(18 m/s)-(0.2 kg)(25 m/s)}{0.4 kg}=5.5 m/s[/tex]
Which data set has the smallest standard deviation?
A. 1,6,19,20,85,29,0
B. 22,22,23,23,22,22,23
C. 6, 7, 6, 7, 1004, 980, 350
D. 99, 199, 299, 55, 44,33, 22
Answer:
B. 22,22,23,23,22,22,23
Explanation:
The standard deviation is a measure of dispersion or variability of a data set. In order to determine the data set that has the smallest standard deviation, we shall investigate on the ranges of the data sets given. The range of a data set is simply the difference between the maximum and minimum values in a data set. A data set that has a smaller range also has a smaller standard deviation.
From the alternatives given, the data set given by alternative B has the smallest range and consequently the smallest standard deviation.
The maximum value is 23 while the minimum is 22. The range is 1.
Does electrons have more mass than neutrons?
Answer:
No, neutrons have about the same mass as a proton, but both have more mass than electrons.
Hope this helps a bit,
Flips
If an electric circuit is not grounded it is best to reach out and touch it to provide the ground A.True or B.False
An object's buoyant force and weight mean the same thing.
A. True
B. False
Answer:
False
Explanation:
No. The buoyant force on an object is the portion of its weight that appears to vanish
when the object is in any fluid (could be either a liquid or a gas).
If the object happens to float in a particular fluid, then the buoyant force at that moment
is equal to the object's weight.
Notice that the buoyant force on an object will be different in different fluids.
Answer:
false
Explanation:
there are more and more jobs in cybersecurity because
Answer:
it is a nation wide crisis
Explanation:
Answer:
The internet is always growing
Explanation:
Which of the following equations is not balanced?
N2 + 3H2 → 2NH3
A. N2 + 3H2 → 2NH3
B. MgI2 + Br2 → MgBr2 + I2
C. KClO3 → KCl + O2
D.HCl + NaOH → NaCl + H2O
Answer: C) KClO3 → KCl + O2
Explanation:
the equation has an unequal amount of oxygen.
you can confirm because all the other equations are balanced so the answer is c
Answer:
[tex]KClO_{3}\rightarrow KCl+O_{2}[/tex]
(C) is correct option
Explanation:
Balanced equation :
In balanced equation, The number of atoms of each element in product side equal to the number of atoms of each element in reactant side.
The equation is not balanced in option C.
[tex]KClO_{3}\rightarrow KCl+O_{2}[/tex]
In this equation, The number of oxygen element in product side is not equal to the number of oxygen element in reactant side.
All equations are balanced.
A force of 8,480 N is applied to a chart to accelerate it at a rate of 26.5 m/s2. What is the mass of the cart?
For this case we have that by definition, Newton's Second Law states that:
[tex]F = m * a[/tex]
Where:
F: It's the strength
m: It's the mass
a: It's the acceleration
According to the data we have to:
[tex]F = 8,480N\\a = 26.5 \frac {m} {s ^ 2}[/tex]
If we clear the mass of the formula we have:
[tex]m = \frac {F} {a}\\m = \frac {8,480} {26.5} = 320kg[/tex]
Answer:
The mass of the chart is 320kg
If a single-load Series circuit has one 20 Ohm bulb, and a
second, identical, 20 Ohm bulb is added in parallel with
the first, what will be the effect on the brightness of the
bulbs?
At the instant the second bulb is connected ...
... the brightness of the first bulb doesn't change
... the brightness of the second bulb changes from dark (no brightness) to equal to the first bulb
When the second 20 Ohm bulb is added in parallel, the bulbs becomes brighter
How to describe the effectAdding a second, identical 20 Ohm bulb in parallel with the first one will have the effect of increasing the brightness of the bulbs.
In a series circuit, the total resistance increases as more resistors are added, which reduces the current flowing through the circuit. As a result, the bulbs would be dimmer in a series circuit.
However, when the second 20 Ohm bulb is added in parallel, the total resistance decreases, allowing more current to flow through the circuit. This increased current results in a higher brightness of the bulbs.
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What type of bond is most likely to form between two gold atoms.Ametalic bond. B non polar covalent bond. C polar covalent bond. D ionic bond
the answer is A
metallic bonds are formed between metal ions
Which statement is an observation from Newton’s experiments with light? White light becomes a range of colors after passing through a prism. A prism adds a range of colors to white light. Newton asked questions about the makeup of white light. A prism is a useful device for experimenting with white light.
Explanation:
White light is composed by a range of colors, this was discovered by Isaac Newton when he observed that a beam of white light was refracted (the different rays of light are diverted depending on their wavelengths) when passing through a prism .
This phenomenom was later called dispersion.
An observation from Newton's experiments with light is that white light separates into a range of colors when passed through a prism, revealing that white light is composed of different colors.
The statement that is an observation from Newton's experiments with light is "White light becomes a range of colors after passing through a prism." This observation comes from a series of experiments conducted by Isaac Newton in the seventeenth century, where he demonstrated that white light is not a single pure substance but is composed of many different colors.
Newton used a prism to separate sunlight into a spectrum of colors, and then recombined them with another prism to form white light again, proving that the colors were inherent in the white light and not a creation of the prism.
A measurement standard is defined as ____.
Answer:
A measurement standard is defined as 'the exact quantity people agree to use for comparison'.
Explanation:
For the same type of quantity, there is a unit of measurement which is defined and adopted either conventionally or by law which is used as standard for measurement of that quantity.
This measurement standard is defined as 'the exact quantity people agree to use for comparison'.
For example, for length the standard unit of measurement is 'meter'.
Answer:
is an object system or experiment that bears a defined relationship to a unit of measurement of a physical quality
In the equation for the gravitational force between two objects, what does G represent?
The G is represented as “Universal Gravitational constant” in the gravitational force equation acting between the two objects.
Explanation:
The force of gravitation is given by following equation, [tex] \bold{F= \frac{- G (M m)}{r^2}} [/tex]
F - Force of gravitation,
G - Universal gravitational constant,
M - Mass of [tex]1^{st}[/tex] object,
m - Mass of [tex]2^{nd}[/tex] object,
R - Distance between two objects.
The negative sign here denotes that gravitational force is experienced along the line of separation of the two objects. And it also indicates that it is an attractive force between the two.
The sun is the driving force behind each of these kinds of energy except.........
a. solar energyb. nuclear energyc. hydroelectric energyd. wind energy
The sun is the original source of solar energy, hydroelectric energy, food energy, coal energy, oil energy, and wind energy.
The sun is NOT the original source of nuclear energy. (b)
Answer:
The answer is b. nuclear energy
Explanation:
Nuclear energy is a process through which electrical energy is generated by the disintegration of atoms from a material called uranium. The energy that uranium releases when its atoms disintegrate produces heat with which the water found in nuclear reactors is boiled to produce electricity.
A light wave travels through water (n=1.33) at an angle of 35º. What angle
does it have when it passes from the water into air (n=1.00)?
n, since
Use the equation , = sin
N2
Answer:
[tex]49.7^{\circ}[/tex]
Explanation:
We can solve the problem by using Snell's law:
[tex]n_1 sin \theta_1 = n_2 sin \theta_2[/tex]
where
n1 = 1.33 is the index of refraction of the first medium (water)
n2 = 1.00 is the index of refraction of the second medium (air)
[tex]\theta_1 = 35^{\circ}[/tex] is the angle of incidence of the wave in water
[tex]\theta_2[/tex] is the angle of refraction of the wave in air
Solving for the angle of refraction,
[tex]sin \theta_2 = \frac{n_1 sin \theta_1}{n_2}=\frac{(1.33) sin 35^{\circ}}{1.00}=0.763\\\theta_2 = sin^{-1} (0.763)=49.7^{\circ}[/tex]
Answer:
49.7
Explanation:
Which property is expressed in distance units?
O
A. Period
O B. Wavelength
O C. Speed
O D. Frequency
Answer:
wavelength
Explanation:
its expressed in meters
Final answer:
The property expressed in distance units is wavelength (option B), symbolized by λ, and typically measured in meters.
Explanation:
The property that is expressed in distance units is B. wavelength. It is the distance between two corresponding points of a wave, such as the distance between the midpoints of two consecutive peaks or troughs. The symbol for wavelength is λ (lowercase Greek lambda), and the units used to describe wavelengths are typically meters (m). Frequency, denoted by ν (lowercase Greek nu), is the number of oscillations that pass a specific point in a given period of time, measured in hertz (Hz). Speed, the rate at which a wave travels through a medium, is expressed in meters per second (m/s). Period, the time it takes for one complete oscillation to occur at a fixed point, is measured in seconds (s).
What about a rubber band, can it change its shape? Is it a solid?
Answer:
Yes it is a solid
Explanation:
It just has unusual properties.
Does it float when you drop it? then it is not a gas.
Does it pour into any container as water does? Then it is not a liquid.
So it's a solid.
And it can change it's shape
Answer:
Yes, it is.
Explanation: Rubber band is ab elastic material which when stretched changes it's original shape.
Heat flows from ______ substances
Answer:
hot to cold
Explanation:
Heat will always flow from hot to cold substances.
Heat flows from "hot to cold" substances.
Explanation:
"Heat flows from hot to cold" is the statement of "Second Law of Thermodynamics".
According to this law, the heat flow is due to the collision of hot atoms collides with cold atoms transferring kinetic energy. When the heat flows from "hot to cold", external energy is not required for the flow, but when it flows from cold to hot, it needs external energy in which the spontaneity of heat flow is less.
The chart shows Daniela’s run through her race.
What is her velocity?
1.5 m/s
2 m/s
2.5 m/s
5 m/s
Answer:
Its 2.5
Explanation:
She moves at 5 m per 2 seconds so she moves at 2.5 m per second
The provided data is insufficient to calculate Daniela's velocity. This is because velocity not only considers the speed but also the direction. Therefore, information on Daniela's direction during the race is necessary for an accurate calculation.
Explanation:Unfortunately, the question does not provide sufficient information to calculate Daniela's velocity. Velocity is a measure that describes how much distance an object covers in a particular direction in a given amount of time. To calculate this, we must know not just the speed (distance/time) but also the direction of travel. Without the necessary data regarding Daniela's direction of movement during her race, we cannot provide a precise velocity value.
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could someone help and explain
Answer:The loudest of the two sound wave is second one
Explanation:because if shout the sound go high,then which one show you the highest the second one rigth
A student wears sunglasses to help her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses?
a polarization
b.refraction
c.diffraction
d. interference
Refraction is the bending of light as it passes from one medium to another, causing objects to appear shifted or distorted when viewed through lenses.
The wave interaction that occurs as light passes from the air into the plastic lenses of the sunglasses is refraction. Refraction is the bending of light as it passes from one medium to another due to the change in its speed. This bending of light is what makes objects appear shifted or distorted when viewed through lenses.