If there are 20 volts across a 4 ohm resistor, then the current is 5A (20/4), which is present in option D, as the current can be measured by Ohm's law and more current means less resistance and less current means there is more resistance.
What is the significance of Ohm's law?It is significant for the understanding of the current and related fields, it can be used to predict the behavior of electrical circuits, it is helpful to design circuits, it gives knowledge of energy efficiency in electrical systems, and it helps in understanding the relationship between voltage, current, and resistance in a circuit.
Hence, if there are 20 volts across a 4 ohm resistor, then the current is 5A (20/4), which is present in option D, as the current can be measured by Ohm's law and more current means less resistance and less current means there is more resistance.
Learn more about Ohm's law here.
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All materials are made up of elements. Which of the following best describes elements? A. Mixtures combine in several different ways to make many kinds of elements. B. Elements are unable to combine in order to make different compounds. Elements combine in several different ways to make many kinds of compounds. > D. Compounds combine in several different ways to make a limited number of elements,
Answer:
a.
Explanation:
Answer:
I am pretty sure it is C!
Explanation:
According to www.open.edu,
Elements are substances that are made from one type of atom.
Compounds are substances made from atoms of different elements joined by chemical bonds.
A mixture is made by simply mixing together elements and compounds.
Atoms are the basic building blocks.
i think A is incorrect because, while the statement may be correct, it is talking about Mixtures, not elements themselves!
B is incorrect because elements ARE able to combine to form compounds!
D is incorrect because ELEMENTS combine to create compounds, i am pretty sure compounds don't combine to create elements.
You are standing on the bleachers in the gym. What supporting force are you experiencing?
a. Friction
b. Tension
c. Gravity
d. Normal
Based on the table,which car had the slowest speed??
Answer:
car 4 i think
Explanation:
Answer:
car 3
Explanation:
car 1 - fastest - .5 seconds per meter
car 2- 2nd fastest - 1 second per meter
car 4 - 3rd fastest - 1.25 seconds per meter
car 3 - slowest - 1.5 seconds per meter
As you move from left to right across the periodic table, what happens (in terms of metals/nonmetals, etc.)?
Answer:
Hope it helps;)
Have a good day
plz help
Potential energy is often called
Question 1 options:
moving energy
stored energy
new energy
size energy
Answer: Stored energy
(need help asap!!)
if the angle between two forces is smaller, what will happen to it's resultant force? will it be bigger or smaller?
Answer:
if more angle = high resultant force.
as resultant force is directly proportional to the angle.(mgsintheta
PLEASE HELP ASAP!!!!!!!!!!!!!!!!!!
Answer:
The answer is A) byee!!
Explanation:
What is so soothing about the ocean? And why are some people afraid of the ocean?
Answer:
hydrophobiaExplanation:
it is phobia of waterand please add me on sñap
arshad2623fI hope u will add meThe ocean is very calm and beautiful its so soft and the waves are beautiful especially at night.
Some people are afraid of the ocean because of probably sharks, fish, or those grass in the ground. some times they think the ocean is going to take them away i think thats a phobia.
Part A
The simulation shows radio waves emitted by an electron that is in a radio transmitter. The window in
the bottom-right corner shows the wave emitted by the transmitter. Move the electron up and down, and
observe the wave it emits in the window. Change the speed of the motion of the electron. What
relationship do you notice between speed and wavelength?
Answer:
The wavelength decreases as the electron speeds up. The wavelength increases as the electron slows down.
Explanation:
Is this right? Please help me
If a 2 kg ball is moving at 6 m/s to the right and then hits a wall and bounces back at - 4 m/s (left), what is the change in momentum (in kg*m/s)?
Answer:
The change in momentum (in kg*m/s) [tex]= 20[/tex]
Explanation:
The change in momentum is equal to
Final Momentum - Initial Momentum
As we know
Momentum is equal to the product of mass and velocity
M = m * v
Thus, change in momentum
[tex]m_2v_2 - m_1v_1[/tex]
here m1 = m2 = 2 Kg
Substituting the given values in above equation we get -
[tex]2 * 6 -( 2 *-4)\\12 + 8 = 20[/tex]kg m/s
What is one advantage of using electromagnets instead of permanent magnets
What is the main source of carbon dioxide in the atmosphere
Answer: respiration by animals and plants and burning of fuel.
Explanation: would be happy if u give me branliest pls do it
which of the following is not an example of force? A. magnetism B. Electric force C. energy D. friction
Answer:
Friction
Explanation:
A man started at his house and went to the post office, then to the pet store, and finally home again. What is the average velocity if this trip took three hours?
Explain how you arrived at your answer.
Answer:
0
Explanation:
Defining velocity :
Velocity is a vector which is the ratio of a person's total displacement with time.
Displacement, in simple terms refers to the distance between an individual's initial position to his final position.
Man's initial position = House
After all his navigation and points covered irrespective of the distance ;
Final position = House
Hence, we can conclude that the man's Displacement is ;
Final position - Initial position = 0
Hence,
Velocity = Displacement / time taken
Velocity = 0 / 3
Velocity = 0
(1 mark)
(b)
Electricity can also be generated in a pumped storage hydroelectric power station
An advantage of pumped storage hydroelectric power stations is the short start-up fime
they have
(b) (i) What is the importance of the short start-up time?
(1 mark)
(b) (ii) Give one other advantage of a pumped storage hydroelectric power station.
(1 mark)
Answer:
It gives the generating plant more water to use to generate electricity
A backpack weighs 8.2 Newtons and has a mass of 5 kilograms on the moon what is the strength of gravity on the moon
i dont get it so much but
The weight of the bag pack is 8.2 N. g = 1.64 m/s2. Hence, the acceleration due to gravity on moon is 1.64 m/s2. sooo? is it right
what is the efficiency of an engine that puts out 250 J of work for every 500 J of heat put into it?
If you put 300 J of heat into an engine with an efficiency of 0.35, how much work can be done? 3. How much energy must be put into an engine with an efficiency of 0.6 if 270 J of work are required? 4. An engine with an efficiency of 0.425 uses 1200 J of energy. Find the amount of energy wasted by the engine. 5. Calculate the efficiency of an engine operating between temperatures of 258 K and 600 K 6. An engine runs with its exhaust (cold) reservoir at a temperature of 200 K. To what temperature should the input (hot) temperature be set if an efficiency of 0.8 is desired? 7. Complete the following table of temperatures. Fahrenheit Celsius Kelvin 213 15 98.6 75 408
A copper atom has an atomic number of 29 and an atomic mass of 64. What
is the structure of this atom?
A. It has a central nucleus composed of 29 protons and 29 neutrons,
surrounded by an electron cloud containing 35 electrons.
B. It has a central nucleus composed of 29 protons and 35 neutrons,
surrounded by an electron cloud containing 29 electrons.
C. It has a central nucleus composed of 35 protons and 29 neutrons,
surrounded by an electron cloud containing 29 electrons.
D. It has a central nucleus composed of 29 protons and 64 neutrons,
surrounded by an electron cloud containing 29 electrons.
SUBMIT
The answer is B. It has a central nucleus composed of 29 protons and 35 neutrons, surrounded by an electron cloud containing 29 electrons.
Given the data from the question, the correct statement is:
It has a central nucleus composed of 29 protons and 35 neutrons, surrounded by an electron cloud containing 29 electrons (Option B) Composition of atomAn atom is composed of a centrally placed nucleus (containing protons and neutrons) and a cloud of electrons revolving round it.
How to determine the number of neutrons Mass number = 64Proton = 29Neutron =?Mass number = Proton + Neutron
64 = 29 + Neutron
Collect like terms
Neutron = 64 – 29
Neutron = 35
Note
Proton = Electron = 29 (since the atom is neutral)
Thus, we can conclude that the atom has central nucleus composed of 29 protons and 35 neutrons, surrounded by an electron cloud containing 29 electrons (Option B)
Learn more about composition of atoms:
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Give two ways that vegetable oil is different from fat
Answer:
In simple terms, fats are animal fats whereas oils are vegetable oils. The other difference is fats tend to be solids at room temperature; on the other hand, oils tend to be liquid at room temperature.
Explanation:
How could the Cell Theory
have been developed sooner?
Suppose a uniform electric field of 4 N/C is in the positive x direction. When a charge is placed at and fixed to the origin, the resulting electric field on the x axis at x = 2 m becomes zero. What is the magnitude of the electric field at x = 4 m on the x axis at this time?
Answer:
E_total = 3 N / A
Explanation:
The electric field is a vector magnitude so when adding we must use vectors, in this case as the initial field E = 4N / c goes towards the axis axis and the field created by the fixed charge (E1) is also on the axis x we can add in scalar form.
E_total = E + E₁
the expression for the field of a point charge is
E₁ = k q₁ / r²
for the point x = 2m, they do not say that the total field is zero, so the charge q1 must be negative
E_total = E -k q₁ / r₂
we substitute
0 = E - k q₁ / r²
q₁ = [tex]\frac{E r^2}{k}[/tex]
let's calculate
q₁ = [tex]\frac{4 \ 2^2}{9 \ 10^{-9}}[/tex]
q₁ = 1.78 10⁻⁹ C
now we can calculate the field for position x = 4 m
E_total = 4 - 9 10⁹ 1.78 10⁻⁹ / 4²2
E_total = 3 N / A
Directions: Use the passage and the diagram below to answer the question. What is the average speed, in meters per second, of the trip across the field? (Write answer with all decimals but no units.)
Answer:
1.25m/s
Explanation:
Average speed = distance / time elapsed
= 100/80
=1.25m/s
An 6 kg object accelerating from 17 m/s to 10 m/s. What is the change in momentum of the object?
Answer:
Explanation:
Comment
It's a deceleration. You are slowing down.
Givens
vi = 17 m/s
vf = 10 ms
m = 6 kg
delta mv = ?
Formula
delta mv = m * (vf - vi)
Solution
delta mv = 6 (10 - 17)
delta mv = 6 ( -7)
delta mv = - 42
why do you think festival dances should be introduced to the younger generations of today
Answer:
Festival dances should be introduced to the younger generations of today because they teach them about different cultures. Festival dances are also a way to be active and have a fun time.
Explanation:
Question: Describe what drives the cycling of water between the different phases and locations on Earth.
Answer:
Water set free by magma began to cool down the Earth's atmosphere, until it could stay on the surface as a liquid. ... The sun, which drives the water cycle, heats water in the oceans. Some of it evaporates as vapor into the air. Ice and snow can sublimate directly into water vapor.
How do the lungs help maintain the body's pH
balance?
Answer:by removing carbon dioxide from the body
Explanation:
I just got it right
define one ohm resistance
Answer:
1 Ohm is defined as the resistance of a conductor with a potential difference of 1 volt applied to the ends through which 1-ampere current flows. Ohms is the SI unit of electrical resistance
In an experiment to find the specific heat capacity of a metal, it is found that 5200 J is needed to raise the temperature of a 2kg block by 20 °C
What value for the specific heat capacity is given by these results?
A 130 J/(kg C)
B 520J/(kg C)
С 52 000 J/(kg°C)
D 104 000 J/(kg°C)
Answer:
A. 130J / kg°C
Explanation:
Amount of heat (Q) = 5200 J
mass (m) = 2 kg
temperature (dt) = 20°C
specific heat capacity (S) = ?
We know
Q = msdt
5200 = 2 * s * 20
s = 5200 / 40
s = 130 J /kg °C
Hope it will help :)
1. List the four fundamental forces from weakest to strongest.
Answer:
1) the strong nuclear force, 2) the electromagnetic force, 3) the weak nuclear force, and 4) gravity.
Explanation: