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:
If you drive 12 miles north and 35 miles east, what is the direct distance between you and your starting point?
Answer:
For this, you need the pythagorean theorem, which is a^{2}+ b^{2}= c^{2}
Your a should be 12, and your b should be 35. So now you can solve for c, which equals 37 miles.
So the answer is 37 miles
how much power is used to lift a 1.9 kg brick 1.9 in 2.s
Answer:
18W
Explanation:
Power=work/time
Work =force x distance
Force = mass x acceleration due to gravity
F=1.9 x 10
F= 19N
W=19 x 1.9
W=36.1J
P=36.1/2
P= 18watts
a measure of how consistently a result is determined by repeated evaluations is called
Answer:
The answer is precision.
Answer:
Precision
Explanation:
Accuracy is the measure of how close to the actual value a reading is. Precision refers to the degree of closeness the values are to each other while taking a reading.
For example, if a manufacturer says the length of the table is 50 cm, then if you measure it you should also get 50 cm reading, this shows the reading is accurate. If the reading of the table is taken multiple times then if the values are suppose 49.9, 49.94 etc, then the reading is precise.
A projectile is launched horizontally from a height of 8.0 m. The projectile travels 6.5 m before hitting the ground.
The velocity of the projectile the moment it was launched, rounded to the nearest hundredth, is
Answer:
5.09 m/s
Explanation:
Use the height to find the time it takes to land:
y = y₀ + v₀ᵧ t + ½ gt²
0 = 8.0 m + (0 m/s) t + ½ (-9.8 m/s²) t²
t = 1.28 s
Now use the horizontal distance to find the initial velocity.
x = x₀ + v₀ₓ t + ½ at²
6.5 m = 0 m + v₀ (1.28 s) + ½ (0 m/s²) (1.28 s)²
v₀ = 5.09 m/s
The velocity of the projectile the moment it was launched, rounded to the nearest hundredth would be 5.09 m/s.
What is a projectile motion?It can be defined as the motion of any object or body when thrown from the earth's surface and follows any curved path under the effect of the gravitational force of the earth.
As given in the problem, a projectile is launched horizontally from a height of 8.0 m. The projectile travels 6.5 m before hitting the ground.
y = y + v ×t + 1/2 × gt²
0 = 8.0 + v t + 1/2 × -9.8 × t²
t = 1.28 s
x = x + v t + 1/2 at²
6.5 m = v 1.28 + 1/2 × 1.28²
v = 5.09 m/s
Thus, the velocity of the projectile the moment it was launched, rounded to the nearest hundredth, is 5.09 m/s.
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if there's a small amount of friction between two surfaces, the result could be _______
select all that apply
A. no movement
B. heat
C. a little bit of movement
D. sliding around
Answer:A little bit movement
Explanation:
Answer:
all of them
Explanation:
ape x
Select the correct answer.
Anna will wear a black dress when she attends het cousin's wedding. Which color(s) does the dress absorb?
A.
all colors
B. no colors
C. red and green
D. white
Answer:
A: all colors, because black is the absence of color.
Explanation:
Answer:
The answer is option A
Explanation:
Hope it helps
Diamond will scratch quartz. True or False
Answer:true, diamonds will scratch quartz.
Explanation: diamonds have a more compact composition. That is what makes them so hard. Quartz composition is not that compact, so diamond can scratch it.
Q: The acceleration of gravity means that for each second that passes, falling objects move 9.8m? A:True
Answer: false
Explanation:
Answer:
False
Explanation:
If the object covers 9.8 m every second then it has a constant velocity of 9.8 m/s
The acceleration implies that there is a change in velocity. With a constant acceleration the velocity will change linearly.
[tex]S = ut + \frac{1}{2} gt^2[/tex]
The distance traveled each second will not be a constant, it will be a quadratic function as mentioned above.
A student measured the density of gold to be 19.1 g/cm^3. The accepted value of the density of gold is 19.3 g/cm^3. What is the percent error of the student's measurement?
A. 0.20%
B. 1.71%
C. 1.04%
D. 1.39%
Answer:
C. 1.04%
Explanation:
The following information has been provided;
Actual density of gold; 19.3 g/cm^3
Observed/measured density of gold; 19.1 g/cm^3
The formula for percent error is given as;
((actual value - observed value)/actual value)) * 100
[tex]\frac{19.3-19.1}{19.3}*100=1.0363[/tex]
The percent error of the student's measurement is thus 1.04%
The percent error of the student's measurement is 1.04%.
Explanation:
The percent error of the student's measurement can be calculated using the formula:
Percent error = |(measured value - accepted value) / accepted value| * 100%
In this case, the student measured the density of gold to be 19.1 g/cm^3, while the accepted value is 19.3 g/cm^3. Plugging these values into the formula, we get:
Percent error = |(19.1 - 19.3) / 19.3| * 100% = 0.104 * 100% = 1.04%
Therefore, the percent error of the student's measurement is 1.04% (option C).
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In your own words, describe the purpose of using a chemical equation.
Answer:
The purpose of using a chemical reaction is to diagram a reaction, where the left side is formed by reactants and the right side is formed by the product. Through diagraming a reaction, chemists can hypothetically change parts of the both components, that way they would see what to expect in the reaction. Also, they can measure the approximation of amount of mass they would need, and see how components will change after the reaction
A rock collection comes from which part of Earth?
Answer:
rocks form from the outer solid layer of the earth which is the crust
Explanation:
Answer:
Crust
Explanation:
Rock is a solid mass, a collection of minerals which occur naturally. There are three different types of rocks- Igneous, Sedimentary and Metamorphic. These vary in texture and composition. The rocks come from the upper most layer of the Earth- the crust. Heat, pressure, volcanoes, wind and water play important role in formation of rocks.
What is the electric potential at a point in space if a charge of 7.3 × 10-17 coulombs at that point has a potential energy of 6.4 × 10-17 joules?
Answer:
0.88 volts
Explanation:
We are given the amount of charge of a point ( 7.3 × 10^-17 ) along with its potential energy ( 6.4 × 10^-17 joules ).
We are to find the electrical potential at this point.
To find this, we will use the following formula:
[tex]V = \frac{Ep}{q}[/tex]
Substituting the given values in the above formula:
[tex]V = \frac{Ep}{q}V = \frac{6.4 * 10^{-17}\:J}{7.3 * 10^{-17}\:C}[/tex]
V = 0.88 volts
Answer:
V= 1.32 V
Explanation:
Electrical potential energy is calculated using the equation
Ue=1/2CV² where C is the charge and V the voltage at that point in space.
Making V the subject of the formula;
V= √( 2Ue /C)
V= √(2×6.4×10⁻¹⁷÷(7.3 × 10⁻¹⁷))
= 1.32 V
A scientific law tells us what nature will do under certain conditions.
True
False
Hello There!
This Is A "True" Statement.
A scientific law tells us what nature will do under certain conditions.
true or false static is weightless colorless and odorless
Answer:
True.
Explanation:
Carbon can only form ionic compounds
Answer:
The answer is true.
Explanation:
The beta decay of a radioactive isotope results in the conversion of a neutron into a proton and an electron. Assume that scientists have discovered that a new element is formed. Which of the following would best support our understanding that the proton defines an element’s identity?
Question 3 options:
The atomic number decreases by one.
The atomic number increases by one.
The mass number increases by one.
The mass number decreases by one.
AL(OH)2 is__
an acid
a base
a salt
when a sound's intensity increases by a factor of 10, its decibel reading increases by how many decibels?
Answer:
If sound intensity increases by a factor of 10, the decibel reading increases by 10.
Explanation:
Decibel scale:
In order to express levels of sound meaningfully in numbers that are more manageable, a logarithmic scale is used, rather than a linear one. This scale is the decibel scale. every increase of 3 dB represents a doubling of sound intensity.
Increase in decibel scale is given by the formula:
n = 10*log(Increased Intensity of sound/Original Intensity of Sound
n = 10*log(I/I₀)
In our case the sound intensity increases by a factor of 10. So I/I₀ increased by 10 times and will be 10 I/I₀
n = 10*log(10 I/I₀)
n = 10*log(10) + 10log(I/I₀)
n = 10 + 10*log(I/I₀)
This shows that the decibel reading is increased by 10 points.
Answer:
10
Explanation:
Describe the path of the electric current through a circuit?
Answer:
current moves from positive terminal of a cell towards the negative terminal of a cell.
Explanation:
this happens when good conductors which have free electrons moving randomly within them.when a cell i s connected across the ends the free electrons moves in a given direction. then the current starts flowing in a opposite direction with electrons which moves negative terminal to positive terminal.
Final answer:
Electric current in a circuit flows through a closed conducting path enabling charge flow, defined as electric current, with components connected by conducting wires.
Explanation:
Electric current in a circuit follows a closed conducting path. In circuits, charge flows through a complete loop, with the charge flow rate defined as electric current.
An example is a simple circuit with a battery, a switch, and a load like a light bulb connected by conducting wires to provide a pathway for current flow.
When analyzing circuits, wires are treated as perfect conductors, and schematics are used to represent components with standardized symbols and solid lines for connections.
ANSWER ASAP 50 POINTS
Which of the following illustrates how a Venus fly trap senses that an insect has landed in its open leaves?
1. Using tiny hairs, the leaves sense a change in light.
2. Using tiny hairs, the leaves taste a chemical.
3. Using tiny hairs, the leaves detect a touch.
4. Using tiny hairs, the leaves sense a change in water levels.
Answer:It turns out the Venus flytrap is a power plant, capable of generating electrical signals. Each trap is actually a modified leaf: a hinged midrib, which would be the central vein of a more familiar leaf, joins the two lobes, which secrete a sweet sap to attract insects.
Explanation:The leaves of Venus' Flytrap open wide and on them are short, stiff hairs called trigger or sensitive hairs. When anything touches these hairs enough to bend them, the two lobes of the leaves snap shut trapping whatever is inside.
Answer:
The answer is #3
Explanation:
Bohr’s atomic model differed from Rutherford's because it explained that electrons exist in specified energy levels surrounding the nucleus. electrons are embedded within the rest of the atom like plum pudding. an atom is an indivisible sphere. electrons circle the nucleus.
Answer:
electrons exist in specified energy levels
Explanation:
In its gold-foil scattering with alpha particles, Rutherford proved that the plum-pudding model of the atom theorised by Thomson was wrong.
From his experiment, Rutherford inferred that the atom actually consists of a very small nucleus, where all the positive charge is concentrated, and the rest of the atom is basically empty, with the electrons (negatively charged) orbiting around the nucleus at very large distance.
However, Rutherford did not specify anything about the orbits of the electrons. Later, Bohr predicted that the electrons actually orbit the nucleus in specific orbits, each orbit corresponding to a specific energy level. Bohr's model found confirmation in the observation of the emission spectrum lines: when an electron in one of the higher energy level jumps down into an orbit with lower energy, the atom emits a photon which has an energy exactly equal to the difference in energy between the two orbits (and this energy of the photon corresponds to a precise wavelength).
Answer:
A.electrons exist in specified energy levels surrounding the nucleus.
Is correct on edge!
Explanation:
Which team sport utilizes judges to determine the points earned? Football Hockey Rhythmic Gymnastics Soccer
Answer:
Rhythmic Gymnastics
Explanation:
In general, the judges in the sports tend to be in charge for correcting and controlling the breaking of the rules in the particular sport. They are allowed to punish the competitors in accordance with the breaking of the rule, or they are there in order to determine weather a point is regular or not. In the rhythmic gymnastics though, and sports similar to it, the judges have different role, as they are in charge of determining the points earned by the competitors. This is done in a manner where every judge gives certain amount of points, or grades, and when those are summed up, the competitors get their total points.
A wave with a frequency of 500 Hz is traveling at a speed of 100 m/s.what is the wavelength?
Answer:
0.2m
The solution is in the picture
One benefit of the SI system is that it is ____.
Answer:
One benefit of the SI system is that it is 'based on multiples of 10'.
Explanation:
One main benefit of the SI system is that it is based on multiples of 10. Which means that conversion to similar units is easier.
For example, you just need to multiply or divide by 10 to change from grams to kilograms and vice versa.
Also, the standard units defined by the International System of Units are consistent around the world which makes it easier to comprehend and communicate using them.
The SI system, or International System of Units, is beneficial because it is a universal and standardized system of measurement used worldwide in scientific domains. This avoid the need for unit conversion and ensures consistency in scientific communication.
Explanation:One benefit of the SI system, which stands for International System of Units, is that it is universal. This means it is widely used throughout the world in all domains of scientific measurement. It's a standardized system of measurement that uses seven base units, including the meter for length, the kilogram for mass, and the second for time, among others.
This makes it easier for scientists, researchers, and students alike to understand and communicate data without needing to convert units. Its universality and consistency make it a fundamentally important tool in many fields including physics, engineering, and chemistry.
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How much force do you push down on the Earth with? (Hint: 1kg is about 2 pounds).
The force with which I push down on the Earth is PRECISELY equal to the force with which the Earth pushes UP on me.
I weigh EXACTLY the same amount on the Earth as the Earth weighs on me. Find THAT amount, and you'll have the answer to the question.
(Hint: 1 kg is a mass, and 2 pounds is a force, so they can never be equal. 1kg weighs about 2.2 pounds IF it happens to be on Earth. But if the same 1kg is on the Moon, then it weighs about 5.8 ounces. And if it happens to be on Mars, then it weighs about 13.3 ounces. The same kilogram weighs different weights in different places.)
On a good day, I push down on the Earth with about 890 Newtons of force. No matter how hard I try, I can never push more or less than that.
Force is the product of mass and acceleration. The force that an average person pushes down on the earth is about 598 N.
Force:It is defined as the product of the mass and acceleration. It is measured in Newton.
[tex]F= m a[/tex]
Where,
[tex]F[/tex] - force
[tex]m[/tex] - mass = 60 kg
[tex]a[/tex]- acceleration = 9.8 m/s²
Put the values in the formula,
[tex]F= 60 \times 9.8 \\\\F = 598 \rm \ N[/tex]
Therefore, the force that an average person pushes down on the earth is about 598 N.
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What is one advantage of using secondary sources when doing research?
Answer:
It saves time and cost nothing than to get the same information that would cost money.
What mistake did Carl make?
Carl makes the table below to determine the number of
atoms of each element in the chemical formula 4Ca(CIO3)2.
Element Calculation
Calcium 1x4
Chlorine 1 x 2
Oxygen 3 x 2
Total atoms
4
2
6
He did not multiply the calcium atoms by the subscript 2.
He did not add the coefficient 4 to the chlorine and oxygen
atoms.
He did not add the subscript 2 to the calcium atoms.
He did not multiply the chlorine and oxygen atoms by the
coefficient 4.
Answer:
He did not multiply the chlorine and oxygen atoms by the coefficient 4
Explanation:
Answer:
The correct answer is:
'He did not multiply the chlorine and oxygen atoms by the coefficient 4'.
Explanation:
Number of atoms in [tex]4 Ca(ClO_3)_2[/tex]
The 4 in front of molecular formula of calcium chlorate is its coefficient . it tells us about the molecules or moles of compound.
Number of calcium in 1 molecule of calcium chlorate = 1
Calcium atoms in 4 molecule of calcium chlorate = 1 × 4 = 4
Number of calcium in 1 molecule of calcium chlorate = 2
Chlorine atoms in 4 molecule of calcium chlorate = 2 × 4 = 8
Number of oxygen in 1 molecule of calcium chlorate = 3 × 2 = 6
Oxygen atoms in 4 molecule of calcium chlorate = 6 × 4 = 24
So, number of atoms of different elements calculated by Carl was wrong as he didn't multiplied the coefficient 4 with chlorine and oxygen atoms.
A localized impediment to electron flow in a circuit is a:
resistor
source of emf
conduit
conductor
What happens to light waves from a star as the star moves toward Earth?
GUESS WHAT??? I'LL MAKE YOU BRAINLIEST SO HURRY UP AND ANSWER THIS!!!!
A light year is a measurement of ___________.
a) time
B) distance
c) speed
D) intensity
Answer:
B. distance
Explanation:
leads to 9.4607 × 1012 km the length of how it is associate that is traveled by light for a year in an astronomical unit of distance.
♡
Answer:
B) Distance
Explanation:
Think about how a light year is used.
Here is proof that my answer is correct: