Answer:
d.the time it takes for the water to boil
Explanation:
it is because salt was added to the water.so the responding variable is the time taken to boil the water
help pls i been stuck on this for 40 mins already
Answer:
See below
Explanation:
At A they add together (they are both positive)= construct
At B they destruct ( one is neg and one is pos)
c destruct d destruct e construct (both neg)
When you transfer energy to a drum through a drumstick or your handhow does the amount of energy affect the sound the drum makes? Explain using the Crosscutting Concept of Energy and Matter
Answer:
Striking the head of the drum changes its shape and compresses the air inside the shell. The compressed air presses on the bottom head and changes its shape. Then, these changes are transmitted to the drum shell and reflected back, and this action is repeated, creating a vibration. These vibrations of the top and bottom heads create vibrations in the air, which become sound, and eventually, as the head vibrations are dampened, the sound diminishes.
Explanation:
An object initially at rest on a horizontal surface is set into motion by the application of a force. Does the force of friction between the object and the surface decrease, increase, or remain the same immediately after the object starts to move?
Answer:
C always
Explanation:
The force of friction between the object and the surface decrease immediately after the object starts to move.
What is friction?The force preventing solid surfaces, fluid layers, and material components from sliding past one another is known as friction.
The definition of static friction is: The resistance people feel when they attempt to move a stationary object across a surface without actually causing any relative motion between their body and the surface they are moving the object across.
The resistance that is formed between any two items when they are sliding against one another is known as sliding friction.
It is experimentally proved that the force of friction between the object and the surface decrease, immediately after the object starts to move.
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There are ___ particles that make up an atom which are the smallest unit of an ___.
Answer:
subatomic, element
Explanation:
Subatomic particles are protons, neutrons, and electrons. Atoms are the smallest unit of an element.
Is it possible for a person to have zero mechanical energy? Why or why not?
Answer: No
Explanation:
There are a few explanations as to why. I'm not sure as to what level of an explanation you are looking for. A person's body is made of atoms, which have constant motion due to multiple processes. An atom can never ever be frozen to absolute zero motion, we can only approach that value. Therefore, we will always have kinetic energy. Another explanation is Einstein's famous formula E = mc^2. This is the rest mass energy, which all things with mass obey. There is an energy-mass equivalence.
Which of the following statements is true?
A spark causes combustion in a gasoline engine.
All oxidation reactions cause explosions.
Batteries were invented during the 20th century.
All oxidation reactions absorb heat.
which statment about scientific knoledge is false
please help i’m so lost✋:
Place the following events describing the production of electrical energy from a nuclear fission reactor in the correct order. Write the numbers 1 (first) through 7 (fast) in the spaces provided.
The thermal energy from nuclear reactions is first converted to mechanical energy and finally to electrical energy for use by the community.
What is nuclear energy?Nuclear energy is the energy produced as a result of changes that occur in the nucleus of atoms of elements. These changes are known as nuclear reactions.
Electrical energy can be generated from nuclear reactions.
The steps in the generation of electrical energy from nuclear reactions is as follows:
A neutron bombards a uranimu-235 isotope A uranium-235 atom splits, producing atoms with smaller nuclei, three neurons, and thermal energythermal energy released by the react ion is added to water superheated water passes through a thermal exchanger, where the thermal energy released boil a separate system of water to produce steam steam produced by boiling water causes the blade of a turbine to rotate The mechanical energy of the rotating turbine is transferred to an electric generator electricity from the generator is carried to the community through wires.Therefore, the thermal energy from nuclear reactions is converted to electrical energy for use by the community.
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Ryan holds a ball still at position A and then releases it. His friend stops the ball at position F. The image shows the path of the ball from position A to position F. Identify the kind of energy the ball has at each position. PE
KE
PE and KE
Answer:
See below
Explanation:
a PE only...the ball is not moving
b and c PE and KE
d KE only
e and f PE and KE
The energy of the ball at its highest position is potential energy.
What is law of conservation of energy ?The law of conservation of energy states that, energy can neither be created nor destroyed. Despite this, it is capable of changing its form. The sum of the energies in an isolated system is constant regardless of the types of energy present.
Here,
According to law of conservation of energy, at each position of the ball, it will have some amount of energy.
At point A
The ball is at its highest position, that means maximum height. So, the energy of the ball at that position is potential energy and it doesn't have any kinetic energy.
At points B and C
At these positions the ball is moving downwards. That means the potential energy is being converted into kinetic energy of the ball. So, it has both PE and KE.
At point D
The ball is at the lowest position, on the ground. So, the potential energy is zero. Therefore, it has the kinetic energy.
At points E and F
At these positions, the ball is moving upwards. So, it has both PE and KE.
Hence,
The energy of the ball at its highest position is potential energy.
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b. The silica cylinder of a radiant wall heater is 0.6 m long
and has a radius 6 mm. If it is rated at 1.5 kw estimate
its temperature when operating. [The Stefan constant,
6=6 x 10-8 wm-2-4)
Ans: 1025 K
So, If the silica cyliner of the radiant wall heater is rated at 1.5 kw its temperature when operating is 1025.3 K
To estimate the operating temperature of the radiant wall heater, we need to use the equation for power radiated by the radiant wall heater.
Power radiated by the radiant wall heaterThe power radiated by the radiant wall heater is given by P = εσAT⁴ where
ε = emissivity = 1 (since we are not given), σ = Stefan-Boltzmann constant = 6 × 10⁻⁸ W/m²-K⁴, A = surface area of cylindrical wall heater = 2πrh where r = radius of wall heater = 6 mm = 6 × 10⁻³ m and h = length of heater = 0.6 m, and T = temperature of heaterSince P = εσAT⁴
P = εσ(2πrh)T⁴
Making T subject of the formula, we have
Temperature of heaterT = ⁴√[P/εσ(2πrh)]
Since P = 1.5 kW = 1.5 × 10³ W
Substituting the values of the variables into the equation, we have
T = ⁴√[P/εσ(2πrh)]
T = ⁴√[1.5 × 10³ W/(1 × 6 × 10⁻⁸ W/m²-K⁴ × 2π × 6 × 10⁻³ m × 0.6 m)]
T = ⁴√[1.5 × 10³ W/(43.2π × 10⁻¹¹ W/K⁴)]
T = ⁴√[1.5 × 10³ W/135.72 × 10⁻¹¹ W/K⁴)]
T = ⁴√[0.01105 × 10¹⁴ K⁴)]
T = ⁴√[1.105 × 10¹² K⁴)]
T = 1.0253 × 10³ K
T = 1025.3 K
So, If the silica cylinder of the radiant wall heater is rated at 1.5 kw its temperature when operating is 1025.3 K
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what is the voltage of a circuit with power 36 W and current 4.5 A
Answer:
8 v
Explanation:
power = watts = v i
36 = v (4.5)
v = 8 v
Mars moves in an elliptical orbit around the Sun. The location of the Sun relative to this ellipse is
Answer:
It is when the focus of the ellipse that is closer to the point where Mars is moving the fastest.
Explanation:
I hope it helps! Have a great day!
Anygays-
Hello people ~
If a +ve charge is moved from low to high
potential region, the electric potential energy:
(a) decreases
(b) increases
(c) remain the same
(d) may increase or decrease
Answer:
The answer is increases.
Explanation:
When positive charge is shifted from a low potential to a high potential region, the electric potential energy increases.
Explanation:
Electric potential energy directly depends upon potential region
Charge always flows from higher density to lower density in case of negative and for positive charge it's vice versa
Hence correct choice is option B
Lewis structure for BeCI2
Answer:
you can see it in the picture
define 1 calorie heat
Answer:
"One calorie of heat is defined as the amount of heat needed to raise the temperature of one gram of water by one degree Celsius"
Hope this Helps!
Explanation:
One calorie of heat is defined as the amount of heat needed to raise the temperature of one gram of water by one degree Celsius (or one kelvin).
From a penalty kick, the ball rebounds off the goalkeeper back to the player who took the kick. That player then kicks the ball into the goal. What is the correct restart
The correct restart is for there to be another kick off taken in this type of scenario.
What is Kick-off in Soccer?This is a method of restarting play in which the ball is put on the center circle and passed by a player.
Kick offs occur at the beginning of any halves or when a goal is scored during the match which is why it's the most appropriate choice.
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Answer:Kick offs occur at the beginning of any halves or when a goal is scored during the match which is why it's the most appropriate choice.
Explanation:
Analysis: (use a separate sheet of paper)
1. Write a scientific explanation about the relationship between frequency, wavelength, and
wave speed. Make sure to cite specific evidence from your investigation.
2. In one or two sentences describe how the frequencies of the different harmonic patterns
are related to each other.
3. If the frequency, increases what happens to the wavelength?
Speed, frequency and wavelength are interconnected to each other.
What happens to the wavelength if the frequency increases?As a wavelength increases in size, its frequency and energy (E) decrease. As the frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer.
The wave speed is equal to the product of its frequency and wavelength, which shows the relationship between frequency and wavelength.
So we can conclude that speed, frequency and wavelength are interconnected to each other.
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1. The transfer of heat by means of the movement of a substance is known as…
A. Conduction
B. Convection
C. Radiation
D. Transpiration
2). Which form of energy does a plant store when light is transformedduring photosynthesis?
A. Chemical energy
B. Thermal energy
C. Mechanical energy
D. Electrical energy
3.) telephones use electromagnets to change…
A. Electric currents to light waves
B. Electric currents to sound waves
C. Magnetism to light waves
D. Magnetism to sound waves
(( pleaaseee heelp meee))
Answer:
1 A 2 d 3 b. okjajsnsnzbsbsbsbsbExplanation:
okk
The students changed the release distance of the sphere during their investigation. Which statements best describe the purpose for increasing the release distance between the trials? Select all that apply.
A. to indicate balanced forces are acting on the spheres
B. to determine the types of forces acting on the spheres
C. to measure the strength of the force acting on the spheres
D. to change the direction of the force acting on the spheres
E. to observe the effect of unbalanced forces acting on the spheres
Since unbalanced forces acts on the spheres, the aim of increasing the release distance of the spheres is to observe the effect of unbalanced forces acting on the spheres.
What is an experiment?An experiment is a study whose objective is to study cause and effect relationships. In this case, the students had to increase the distance at which the spheres was released.
The aim of increasing the release distance of the spheres is to observe the effect of unbalanced forces acting on the spheres.
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What will happen to the period of a ball-on-a-spring if the ball is replaced by a smaller one with half the mass
When the ball on a spring is replaced by a smaller ball with half the mass : The period decrease by 29%
Calculate the Period
We will apply the formula below to calculate period
T = [tex]2\pi \sqrt{\frac{m}{k } }[/tex]
where :
T₁ / T₂ = [tex]\sqrt{\frac{m_{1} }{m_{2} } }[/tex] where m₂ = m₁ / 2
Therefore :
T₂ = [tex]\frac{T_{1} }{\sqrt{2} }[/tex] = 0.71 T
Hence we can conclude that the period will decrease by 29% ( i.e 100 - 71 ).
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Which of the following is a component of all galaxies?
A. Objects that contain dust and gas
B. Objects that orbit the stars
C. Objects that orbit the sun
D. Objects that shine in the sky
Answer:
Objects that orbit the sun
Explanation:
Answer: A. Objects that contain dust and gas
Explanation: All galaxies have dust and gas. Answer C is incorrect because the answer says "the sun" how would and how would multiple galaxies have objects that orbit our sun?
(Oh, btw it's C I'm just messing with you guys)
Continuous signals are characterized as . signals that are broken up into binary code are characterized as . an am/fm radio is a good example of technology. a smart phone is a good example of technology.
Continuous signals are characterized as analog signals that are broken up into binary code are characterized as digital.
An am/fm radio is a good example of analog technology. A smart phone is a good example of digital technology.
What is a Digital technology?These are devices that generate, store or process data while analog is a continuous signal that represents physical measurements.
The examples of analog and digital technology are mentioned above and is the most appropriate choice.
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Answer:
Analog, Digital, Analog, Digital
Explanation:
edge 2022
Ayo? i need help asap
Let's do some calculation! Using the information below, calculate the speed of the wave. MAKE SURE TO INCLUDE YOUR UNITS!
wavelength = 2.3 cm and frequency = 3.7 Hz
The Mechanical Advantage equation is written as ___
A car is traveling on the road at a velocity (Vx) of 35m/s. A person in the passenger seat
has a tennis ball and is tossing the ball up in the air to himself. He throws the ball directly up
with a velocity (Vy) of 3m/s. An outside observer is sitting on a bench on the side of the street
watching the car pass.
a) To the person inside the car, the ball travels directly up and down. But to the
outside observer, what is the launch angle of the ball?
b) What is the ACTUAL Speed (IVI) of the ball when it leaves the person's hand?
c) What is the maximum height the ball will reach in the car?
d) How long will the ball stay in the air?
e) How far will the ball travel in the direction of travel on the road?
(a) The launch angle of the ball is 5⁰.
(b) The actual speed of the ball when it leaves the person's hand is 35.13 m/s.
(c) The maximum height reached by the ball is 0.46 m.
(d) The time spent in air by the ball is 0.26 s.
(e) The horizontal distance traveled by the ball on the road is 4.55 m.
Launch angle of the ball
The launch angle of the ball is calculated as follows;
[tex]tan(\theta) = \frac{V_y}{V_x} \\\\\theta = tan^{-1} (\frac{3}{35} )\\\\\theta = 5\ ^0[/tex]
Actual speed of the ballThe actual speed of the ball when it leaves the person's hand is calculated as follows;
[tex]V = \sqrt{V_x^2 + V_y^2} \\\\V = \sqrt{(35)^2 + (3)^2} \\\\V = 35.13 \ m/s[/tex]
The maximum height reached by the ballThe maximum height reached by the ball is calulated as follows;
[tex]Vy_f^2 = V_y_i^2 - 2gh\\\\0 = 3^2 - 2(9.8)(h)\\\\19.6h = 9\\\\h = \frac{9}{19.6} \\\\h = 0.46 \ m[/tex]
Time spent in air by the ballThe time spent in air by the ball is calculated as follows;
[tex]h=V_yt + \frac{1}{2} gt^2\\\\0.46 = 3t + 4.9t^2\\\\4.9t^2 +3t - 0.46 = 0\\\\a = 4.9, \ b = 3, \ c =- 0.46\\\\t = \frac{-b \ \pm \ \sqrt{b^2 - 4ac} }{2a} \\\\t = 0.13 \ s[/tex]
Total time for upward and downward motion = 2(0.13 s) = 0.26 s
Horizontal distance traveled by the ballX = Vx(t)
X = 35 x 0.13
X = 4.55 m
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What is the weight of a box with a mass of 150 kg on Earth?
N
Use g= 9.81 m/s2 and do not include units in your answer.
Answer:
W = M g = 150 kg * 9.81 m/s^2 = 1470 N
You were only given 3 significant figures in the question.
The weight of the box is 1471.5 N.
What is weight?In science and engineering, an object's weight is defined as the force of gravity acting on the thing. Weight is sometimes described as a vector quantity in common textbooks, denoting the gravitational force acting on the item.
Given parameters:
Mass of the box, m = 150 kg.
Acceleration due to gravity, g = 9.8 m/s².
Hence, weight of the box is, W = mg = 150 kg × 9.81 m/s² =1471.5 N.
SO, weight of the box with a mass of 150 kg on Earth is 1471.5 N.
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Question 2 (1 point)
This graph shows an object in free fall. Assume there is no air resistance. What is the only force acting on this object?
Answer:
Actually, there is no force (felt by the object) acting on the object.
It is similar to an object in orbit around the earth (weightlessness)
F = M a describes the motion of the particle where
M a = M g where the acceleration of the particle is equal to the force of gravity acting on the particle
From an external view the only force acting on the particle is M g and it produces an acceleration of M g
There is no force felt by the freely falling body. The cause of free fall is gravitational pull. Where Acceleration is equal to the gravitational acceleration. According to Newton's Law of Gravitation , two bodies attract each other due to their masses and separation , since earth is a very big body therefore the lit body falls towards the earth . Thus the graph plotted is a straight line.
What is Newton's law of Gravitation?
"The force acting between two bodies is directly proportional to product of masses and inversely proportional to the square of the separation ."
F= G.{m_{1} . m_{2} }/r^{2}.
Hence the only force by which the object is falling is gravitational pull.
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What are dogs trained to do when they find an explosive device?.
Answer:
They sit or lay quietly
Explanation:
That's what they are trained to do when they find a explosive device
Someone please help me, I know I already asked a question please don't think I not smart, but
#1. How are potential and kinetic energy related?
#2. How are sounds made?
Answer:
PE is related to the ability to do work, If an item is sitting on a shelf
it has potential energy relative to its position on the floor, However, if the object were to fall it would hit the floor with a KE equal to the PE that it had sitting on the shelf.
Sounds are caused by compressional waves in the air - when a piano key is struck or a TV is turned on, then compressional waves are produced in the surrounding air due to a disturbance. The human ear recognizes the disturbed air as due to the object that created the disturbance.
How do you boost the amount of electricity a fuel cell system produces?.
The amount of electricity a fuel cell system produces is boost by combined to form a fuel cell that is battery.
What is battery?A battery is a device that uses an electrochemical oxidation-reduction (redox) cycle to turn the chemical energy included in its active components directly into electric energy. An electric circuit is used in this kind of reaction to transmit electrons from one substance to another.
The actual elector-chemical unit used to produce or store electric
For this one it should be A single fuel cell generates approximately one volt of electricity. Individual fuel cells are combined to form a fuel cell stack to enhance the amount of electricity produced.
The amount of electricity a fuel cell system produces is boost by combined to form a fuel cell that is battery.
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