It means that machine can do work up to 80% and 20% of the energy is wasted on friction
Which type of energy transformation occurs when a flashlight shines?.
Explanation:
chemical energy into electrical energy
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A plate of warm food is put into a cold refrigerator. What direction is thermal energy being transferred?.
Suppose the Sun moved twice the distance from Earth. Describe immediate and future changes to our planet. Justify your reasoning
Suppose the Sun moved twice the distance from Earth then the time period of the revolution of the earth around the sun would increase resulting in an increase in the number of days of the year.
What is a solar system?It is a system in which the sun's gravitational attraction causes all the planets and celestial bodies to revolve around it.
The Sun is believed to be located in the system's center in the heliocentric concept upon which our Solar System is founded.
If the Sun were to move twice as far away from Earth, the length of time it would take the Earth to complete one rotation would lengthen, increasing the number of days in a year.
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A standard AA battery provides 1.5 V. How many pennies and nickels would you need to include in a voltaic pile to produce the same voltage as a standard AA battery?
Answer: In a battery, voltage determines how strongly electrons are pushed through a circuit, much like pressure determines how strongly water is pushed through a hose. Most AAA, AA, C, and D batteries are around 1.5 volts. Imagine the batteries shown in the diagram are rated at 1.5 volts and 500 milliamp-hours.
Explanation: Today "AA" is frequently used as a size designation, irrespective of the battery's electrochemical system. The main numbers used for the most common NiMH and NiCad battery
To produce a voltage of 1.5 V with a Voltaic pile, we would need either two zinc pennies and one copper nickel or one zinc penny and three copper nickels.
What is a voltaic pile?A Voltaic pile is an early type of battery that consists of alternating discs of two different metals (such as copper and zinc) separated by cardboard soaked in an electrolyte solution. Each pair of metal discs and cardboard makes up one cell of the battery, and the voltage of the battery depends on the number of cells connected in series.
To calculate how many pennies and nickels would be needed to produce a voltage of 1.5 V, we need to consider the voltage generated by each cell and the number of cells required to achieve a total voltage of 1.5 V.
One zinc penny produces approximately 1.1 volts, and one copper nickel produces approximately 0.5 volts. To get a total voltage of 1.5 V, we could arrange one zinc penny and one copper nickel in series, but this combination would produce a voltage of only 1.6 V (1.1 V + 0.5 V).
To get as close to 1.5 V as possible, we could use two zinc pennies and one copper nickel in series, which would produce a voltage of 1.7 V (1.1 V + 0.6 V).
Alternatively, we could use one zinc penny and three copper nickels in series, which would also produce a voltage of 1.5 V (1.1 V + 0.4 V + 0.5 V + 0.5 V).
Therefore, To produce a voltage of 1.5 V with a Voltaic pile, we need either two zinc pennies and one copper nickel or one zinc penny and three copper nickels.
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Which elements can conduct electrical charges: Metals or Non-metals?
What are the products of a fusion reaction? Check all that apply. Lighter atoms energy heavier atoms a neutron a proton.
The process by which two or more tiny nuclei unite to generate a bigger nucleus is known as a nuclear fusion reaction. Heavier atoms are products of a fusion reaction.
What is nuclear fusion?The process by which two or more tiny nuclei unite to generate a bigger nucleus is known as a nuclear fusion reaction.
For example, the fusion of two hydrogen atoms produces more energy than the fusion of one helium atom, and surplus energy is expelled into space upon binding.
Hence heavier atoms are e products of a fusion reaction.
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Answer:
B C D
Explanation:
PLEASE HELP I DONT WANT TO FAIL I will vote your answer 5 stars of you help!!
Answer:
a and d
Explanation:
Help with both a and b please
Explanation:
a.)
Reactants : CO2 (carbondioxide) + H2O (water)
Products : O2 (oxygen) + C6H12O6 (glucose)
b.)
Reactants: Na ( Solid Hydrogen) + H2O (water)
Products: H2 (hydrogen gas) + NaOH (sodium hydroxide)
help me please this is for physics
It's a pleasure to be helping you today with your physics question!
Answer:
[tex]23.1m/s[/tex]
Explanation:
We want to find the initial speed of the ball.
To do this, we have to apply the formula for the time of flight of a projectile:
[tex]T=\frac{2_{v0~sin 0} }{g}[/tex]
where θ = angle of flight
g = acceleration due to gravity
v0 = initial speed
Therefore, substituting the given values into the formula, we have that:
[tex]\boxed{4.2=\frac{2~x~_{v0~sin63} }{9.8}}[/tex]
⇒ 2 ×[tex]_{v0}[/tex] ×0.8910= 9.8 × 4.2
⇒[tex]\boxed{{v0}=\frac{9.8~times~4.2}{2~times~0.8910}}[/tex]
[tex]\boxed{{v0} =23.1m/s}[/tex]
That is the initial speed of the ball.
I hope this helps you!
Good Luck with your Assignment!
what are ohmic resistors ?
Answer:
➢ what are ohmic resistors ?▪Ans : An ohmic resistor is a resistor that obeys Ohm's law. For example: all metallic conductors (such as silver, aluminium, copper, iron etc.) The slo[e of the V-I graph gives the resistance.
[tex]#SolutionGiven[/tex]
An opaque object, like a piece of wood...
Select one:
a. reflects and absorbs light but does not transmit it.
b. reflects light but does not absorb it.
c. reflects, absorbs, and transmits light.
d. transmits light.
Answer:
A. reflects and absorbs light but does not transmit it
Explanation:
I'm pretty sure it's the first one
What is the name of the measurement system used in America?.
Answer:
Imperial :DDDD
Define how the changes in temperature changes and affects the cooling curve? State five important facts. I WILL GIVE A BRAINLIEST.
Answer:
By increasing the temp the faster the heat is transferred so faster the substance cools
And vice versa
An electric lightbulb in a lamp fixture is illuminating a small room. The system consists of the lightbulb, the lamp fixture, the air and the room.
Which choice best describes the role of thermal energy in energy transformations?
The role of thermal energy is to balance the electrical energy lost from the light bulb.
Energy conservationThe law of energy conservation states that energy can neither be created nor destroyed but can be transformed from one form to another.
Thermal energyThis is a form of energy that occurs due to rise in temperature.
The role of thermal energy is to balance the electrical energy lost from the light bulb.
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In which fitness test do u see how many sit-ups you can do in 1 min
Answer:
within the pastor gram test you'll be able to how many sit ups you can do
Explanation:
because with instrucstions you can be guided and not everywhere with it
An object of mass 40 g experiences a force of 18 N. Calculate the acceleration received by this object ?
Answer:
450ms^-2
Explanation:
m = 40g, then converting to standard unit
m = 40g/1000g × 1kg = 0.04kg
F = 18N
using the formula for Force
F = ma
Then making acceleration the subject of the formula; you Will get
a = F/m
a = 18N/0.04Kg
a = 450ms^-2
Protein 1 and Protein 2 have many differences in their amino acid sequences. Based on this information, which of the following statements are true about Protein 1 and Protein 2?
Choose 2 answers:
(choice A)
The proteins are encoded by genes with different nucleotide sequences.
(Choice B)
B
The proteins likely have different functions.
(Choice C)
C
The proteins must be located in different regions of the body.
Answer:
Choice A & Choice B
The proteins are encoded by genes with different nucleotide sequences, they likely have different functions. The correct options are A and B.
Genes with various nucleotide sequences encode the proteins. Protein 1 and Protein 2 have distinct amino acid sequences, indicating that they are encoded by genes with different nucleotide sequences.
Because the amino acid sequences of Protein 1 and Protein 2 differ so greatly, it is likely that they have separate activities.
The assumption that proteins must be found in diverse parts of the body is not always correct. Although proteins with distinct activities may be found in different parts of the body, variations in their amino acid sequences cannot be used to identify this.
Thus, the correct options are A and B.
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Answer and explanation please!!
Answer:
Option 3
Explanation:
O Option C is NEGATIVELY CHARGED, meaning it has GAINED ELECTRONS resulting in a GREATER number of ELECTRONS than PROTONS.
Answer:
Option C.
Explanation:
Firstly, if object A has a positive charge then it means object B also has a positive charge since both the objects are repelling each other (similar charges repel).
Secondly, object C is attracting object B, this means object C has a negative charge since we already know object B has a positive charge (different charges repel each other).
So here, the only correct will be C, "Object C is negatively charged meaning it has gained electrons resulting in a greater number of electrons than protons."
This is because gaining electrons results in more negative charge than positive charge making the object negatively charged.
Does increase in metabolism accelerates weight loss?.
Answer: yes
Explanation: Having a higher metabolism can help you lose weight and keep it off, while also giving you more energy.
Sodium (Na+), potassium (K+), calcium (Ca2+), magnesium (Mg2+), and chlorine (Cl-) are all examples of ___.
Question 3 options:
compounds
cations
electrolytes
anions
Answer:
Compounds
Explanation:
Libby's dog stands 79 yard tall, and Jeff's dog stands 56 yard tall. How much taller is Jeff's dog than Libby's dog?
Answer:
-23 yards taller or sum like that
Explanation:
this isn't physics though
A typical circular saw has a radius of 0. 184 m and rotates so the velocity of its edge is 110 m/s. How many RPM does the saw make?
Answer:
[5710 RPM]
Explanation:
Which factors affect the resistance of a material? Select three options. Length current thickness temperature voltage.
Resistance is a type of opposition force due to which the flow of current is reduced in the material or wire. Length, temperature, thickness are the factors that affect the resistance of a material.
What is resistance?Resistance is a type of opposition force due to which the flow of current is reduced in the material or wire. Resistance is the enemy of the flow of current.
The relation of resistance with length and thickness is given by ;
[tex]\rm R= \frac{\rho l}{A}[/tex]
Hence the value of resistance is directly propotional to length and inversly propotional to the area or thickness of the wire.
As the value of temperature increases, the value of resistance in the material is increasing.
Hence length, temperature, thickness are the factors that affect the resistance of a material.
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Answer:
length, thickness and temperature
Explanation:
2022
Joe Burrow of the Cincinnati Bengals ate a turkey sandwich and an apple for lunch. Later that day, he spent 2 hours on the football field warming up for the NFL playoffs. Which of the following energy transformations occured between lunchtime and the end of Burrow's workout routine?
A. Thermal energy was converted to kinetic energy.
B. Kinetic energy was converted to chemical energy.
C. Electrical energy was converted to thermal energy.
D. Chemical energy was converted to mechanical energy.
Answer:
A Thermal energy was converted to kinetic energy
A charge of 6. 4 × 10–7 C experiences an electric force of 1. 8 × 10–1 N. What is the electric field strength?.
The strength of the electric field will be 2.8×10⁵ NC⁻¹. Electric force F acted per unit positive electric charge q is known as the electric field strength.
What is the electric field strength?The electric, or Coulomb, forces exerted per unit positive electric charge q at any place, can be used to calculate the strength of an electric field E at any position.
It is given by;
E = F/q
The given data in the problem is;
q is the value of charge=6. 4 × 10⁻C
F is the electric force = 1.8 × 10⁻¹ N
E is the electric field strength =?
The electric field strength is found by the formula;
[tex]\rm E=\frac{F}{q} \\\\ \rm E=\frac{6.4\times 10^{-7}}{1.8 \times 10^-1} \\\\ \rm E= 2.8 \times 10^5 \ N/C[/tex]
Hence the electric field strength will be 2.8×10⁵ NC⁻¹.
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Which most likely indicates a chemical change has occurred?
a
O a solid substance becoming larger
a solid melting and becoming a liquid
a green liquid becoming a red liquid
a liquid freezing and becoming a solid
green liquid becoming a red liquid
Among the given options, the chemical change is option c, green liquid becoming red liquid by the some reactions. All other changes are physical changes.
What are chemical changes ?Chemical changes are those which involves the breaking or making of chemical bonds and the formation of a new product that have properties different from the initial substances.
Physical changes does not involve any change in chemical bonding. They include change in size, shape, conducting, solubility all phase changes etc are physical changes.
The change in color of a solution is due to the formation of a new product with different color indicating the occurrence of a chemical reaction. Freezing, boiling, all are physical changes. Hence, option c is correct.
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How are frequency and period related in simple harmonic motion?.
They are reciprocals.
That is . . .
-- Frequency = 1 / period
and
-- Period = 1 / frequency .
the frequency is the inverse of the period, an increase in frequency results in a decrease in the period, and vice versa.
What is the frequency?The frequency of a recurrent occurrence, such as a wave, during a given time period, is measured using this unit. A cycle is a single instance of the pattern's repetition. Only waves that are moving and constantly shifting in location may exhibit frequency. The frequency of a wave can be used to estimate its speed.
The relationship between the frequency (f) and period (T) in simple harmonic motion is inverse.
We may mathematically represent this connection as follows:
f = 1/T
where f is the frequency in hertz (Hz), and T is the period in seconds (s).
The difference between the period and the frequency is how many oscillations or cycles occur in a given amount of time.
A pendulum, for instance, would have a frequency of 1 Hz and a period of 1 second if it oscillates once per second.
The frequency and period are inversely correlated, thus as the frequency rises, the period decreases, and vice versa.
As a result, frequency and period have an inverse connection in simple harmonic motion, where a rise in one variable causes a reduction in the other.
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An oscilloscope is set to 2volts/div, with the centre line representing 0V. It is connected to a source of potential difference, and the trace is a horizontal line, three divisions above the centre line.
oscilloscope is set to 2volts/div, with the centre line representing 0V. It is connected to a source of potential difference, and the trace is a horizontal line, three divisions above the centre line
When a metal, such as lead, is oxidized (loses electrons) to form a positive ion (cation), how does the solubility change? how does the solubility of a metal (ion) like lead affect its toxicity?
The solubility changes because the metal is now attract the negative charge atoms due to forming of positive ion on it.
How solubility of a metal ion affect its toxicity?Solubility of a metal ion affect its toxicity because due to change of ion, the metal behaves differently which affect its toxic nature so we can conclude that the changes of ions greatly affect solubility and toxicity.
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Assuming constant acceleration what would be the speed at 14s ?
We see here that assuming constant acceleration, the speed at 14s will be 70km/hr.
What is speed?Speed is a measure of how fast something is moving, typically measured as distance traveled per unit of time. It is a scalar quantity, meaning that it has magnitude but no direction.
The SI unit for speed is meters per second (m/s), but it can also be expressed in other units such as kilometers per hour (km/h), miles per hour (mph), feet per second (ft/s), and so on.
The formula for calculating speed is:
Speed = Distance / Time
It is clear from the graph that as time increases, there is an increase in speed.
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