Answer:
A) would be the best explanation because hot air is less dense and would rise to the top of a column of air
1.0 A weightlifter picks up a barbell.
1.1 .10. Which type of energy is stored in the barbell when it is held above the weightlifter's head?
[1 mark]
Put an X in one box only.
11
Chemical potential
Elastic potential
Gravitational potential
Kinetic
The type of energy is stored in the barbell when it is held above the weightlifter's head is gravitational potential energy.
What is potential energy?This is the type of energy possessed by an object due to its position above te ground level.
Potential energy of an object is given by the following formulas;
P.E = mgh
where;
m is mass of the objecth is the height above the groundg is gravityThus, the type of energy is stored in the barbell when it is held above the weightlifter's head is gravitational potential energy.
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An object orbiting the sun in an ellipse can be said to be:.
Answer:
always accelerating
Explanation:
Answer:
B. Always accelerating
Explanation:
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Imagine that our Sun were magically and suddenly replaced by a black hole of the same mass (1 solar mass). How would Earth's orbit change
There is no effect on earth's orbit due to similar force of gravity of black hole.
How would Earth's orbit change?If our Sun was replaced with a black hole having the same mass, Earth's orbit will not changed because of the same force of gravitation of balck hole on earth. Due to this replacement, Earth's temperature will change because balck hole is not too hot like sun.
So we can conclude that there is no effect on earth's orbit due to similar force of gravity of black hole.
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Can there be situation when velocity is constant but speed is not
Answer:
yes
Explanation:
as speed is a scalar quantity and velocity is a vector quantity. Which means speed only depends on the magnitude at which it travels but velocity depends on the speed at which travel and also the direction to where the object travels.
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Which types of interactions are negligible at standard temperature and pressure?
Explanation: a reduction in genetic diversity and discomfort for animals that have very exaggerated characteristics.
Can you jump and fall at the same time?
i hate you right now..... im gonna be thinking about this all day now....... ohhhhhhh no i need my 5 monsters now cause i aint sleepin now......
Identify three resources that are mined from the Earth's crust.
Answer:
Mining is the extraction of valuable minerals or other geological materials from the earth from an orebody, lode, vein, seam, or reef, which forms the mineralized package of economic interest to the miner. Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, dimension stone, rock salt, potash, gravel, and clay.
Explanation:
Answer:
Three resources that are mined from earth's crust are:
-Coal
-Gold
-Iron ore
Some more are:
-Aluminum
-Copper
-Lime
-Phosphate rock
-Gypsum
-Sand
-Gravel
-Rock
etc.
Explanation:
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How many electrons do most atoms seek to have in their outermost shell, causing covalent bonds to form? 1 3 4 8
Answer:
8
Explanation:
It is because the outermost energy level carries a maximum of 8 electrons
8 electrons do most atoms seek to have in their outermost shell, causing covalent bonds to form
What is a covalent bond?The interatomic bond is formed when two atoms share an electron pair. The electrical attraction of their nuclei for the identical electrons causes the binding.
When the total energy of the bound atoms is lower than that of widely spaced atoms, a covalent bond is formed.
When an atom's outermost electron shell is full, it is the most stable and least reactive. The octet rule states that most key biological elements require eight electrons in their outermost shell to be stable.
Hence 8 electrons do most atoms seek to have in their outermost shell, causing covalent bonds to form
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When the wheel of a cart rolls from a smooth sidewalk onto a plot of grass, the interaction of the wheel with the blades of grass slows the wheel. What slows light when it passes from air into glass or water
The light oscillates electrons which then absorbs some of the energy and reemit it thereby causing a delay.
What are Electrons?This is defined as a subatomic particle which has a negative charge. In the glass of water the light oscillates the electrons which absorbs some energy.
The re-emission is what slows light when it passes from air into glass or water.
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Question #18:
A steam engine (assume a Carnot engine) has an efficiency of 34.8%. If the waste heat has a temperature of 76 °C, what is the temperature of the boiler? Answer in units of °C.
The temperature of the boiler of the steam engine at the efficiency of 34.8% and waste heat temperature of 76 °C, is determined as 116.56°C.
Efficiency of a Carnot engineThe efficiency of a Carnot engine is determined using the following formula;
n = 100% x (TH - TC)/TH
where;
TH is the temperature of the hot reservoirTc is the temperature of the cold reservoir34.8% = 100% x (TH - 76)/TH
0.348 = (TH - 76)/TH
0.348TH = TH - 76
0.652TH = 76
TH = 76/0.652
TH = 116.56°C
Thus, the temperature of the boiler of the steam engine at the efficiency of 34.8% and waste heat temperature of 76 °C, is determined as 116.56°C.
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Whay are derived quantity?
derived quantity are those that may be expressed in terms of base or derived quantities by means of the mathematical symbols of multification and division
Think about the physical activities that you have done as a part of this course. Describe a time during one activity in which a competitor displayed good sportsmanship toward you.
The activity in which a competitor displayed good sportsmanship towards me was during a football match.
What is Sportsmanship?This is an ethics or attitudes that show respect for the rules of a game and for the other players.
Sportsmanship was shown when i lost the deciding penalty and was consoled by the opponent.
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The Mechanical Advantage equation is written as ___
If the temperature of water in which the sound wave travels
decreases from 90°C to 50°C, then what will happen to the
velocity of the wave?
till
The sound wave travels faster at higher temperatures and slower at lower temperatures.
What will happen to the velocity of the wave if the temperature decreases?At a lower temperature, particles of the medium are moving more slowly as compared to higher temperature. Due to lower temperature, longer time is required to transfer the energy of the sound waves.
So we can conclude that sound travels faster at higher temperatures and slower at lower temperatures.
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Answer:
It will travel slower
Explanation:
Which of the following describes the conditions for an inelastic collision?
(A) momentum conserved, kinetic energy conserved
(B) momentum conserved, kinetic energy not conserved
(C) momentum not conserved, kinetic energy conserved
(D) momentum not conserved, kinetic energy not conserved
Answer: I think it is C.
Explanation: In an inelastic collision, the object hits the item and stays with it. Therefore, both momentum and kinetic energy need to be presen.t
You are sitting at a coffee shop and you overhear a conversation at the next table. Two mothers are discussing their teen children and complaining about their behavior- erratic and irrational behavior, displaying little to no logic and reason. One says to the other, I just don’t know who he is. You have just listened to the NPR article and learned about the Endocrine System. You offer the following advice……
Answer:
Explanation:
Our five-year-old, Gabriel, is a very bright, funny, charming little guy. But he still has a lot of tantrums, which we thought would be over by this age. He reacts very poorly to consequences. He will get very threatening and aggressive physically and verbally: slamming doors, hitting, and lashing out verbally. We are constantly negotiating with limit setting. When we hold to the limit, he will escalate and sometimes will have very intense tantrums that can last over 30 minutes. When he is happy, he is the most delightful child. But the second something doesn’t happen exactly how or when he wants it, he is explosive. We are totally exhausted
The modern model of the atom describes electrons in a little less specific detail than earlier models did. Why is it that being less sure about the placement of electrons in an atom is actually an improvement over earlier models?
Electrons do not follow specific paths, so describing the area where an electron is likely to be is more scientifically accurate.
Electrons were thought to be negatively charged, but now scientists know that their charge depends on their energy level.
The modern model is based on mathematical equations, so the results become less clear when the decimals are rounded.
The position of electrons in atomic models has changed so much that it is better to have a less specific model than to be wrong again.
Answer:
A.
Explanation:
Electrons don’t follow specific paths, so describing the area is more likely to be accurate. They orbit in clouds instead.
Answer: A
Explanation: Just got it right.
Which name is given to the force that stretches the spring with a metal that weights it down
Answer:
gravity
Explanation:
ok what i understand from your query is that a spring balance with a metal piece attached to it is weighing it down, a spring balance is measured in newtons (f=ma), the acceleration part is gravity (-9.81 m/s^2). The metal piece is attached to the string.
hope this answers your question and please take my answer with a grain of salt and refer to some webpages or videos
Why do the wavelengths of the absorption and emission lines match?.
HELP PLEASE ILL GIVE BRAINLY
The main factors in determining your speed on an acceleration lane are:.
Answer:
amount and speed of traffic on the acceleration lane and expressway.
Which sound frequency could a human detect? 1 hertz 10 hertz 50 hertz 50,000 hertz.
Answer:
Good human ears can detect sound from about 50 Hz to about 20,000Hz (20 kHz); this can be called the audible range of frequencies.
so c.50 hertz
Explanation:
Hope it helps :)
Answer:
50 hertz
Explanation:
This is right
When the curvature radius of a converging lens is increased, the size of the image _(blank)_.
A. is magnified
B. is reduced
C. stays the same
When the curvature radius of a converging lens is increased, the size of the image is reduced.
What is radius of curvature ?“The radius of curvature is the radius of sphere formed by the convex or concave mirror.” It is also equal to the distance between the pole and centre of curvature.” The sign convention for focal length and radius of curvature is the same.
What is converging lens?“Converging lenses are lenses which converge the light rays coming towards them, whereas diverging lenses are lenses which diverge the rays coming towards them.” A converging lens have positive focal length.
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what does goin to get da milk mean
Answer:
going to get the milk
Explanation:
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A plane's propeller has a rotational inertia of 2.0kg * m ^ 2 After a clockwise torque of 4.0Nm was applied to the propeller for 4.0s, the propeller has a clockwise angular speed of 24 * (rad)/s What was the initial angular momenturn of the propeller before the torque was applied ?
The initial angular momentum of the propeller before the torque was applied will be 32 kg m²/s.
What is torque?Torque is the force's twisting action about the axis of rotation. Torque is the term used to describe the instant of force. It is the rotational equivalent of force. Torque is a force that acts in a turn or twist.
The amount of torque is equal to force multiplied by the perpendicular distance between the point of application of force and the axis of rotation.
The given data in the problem is;
The rotational inertia is,I = 2.0 kg m²
The clockwise torque is, T = 4.0Nm
The time period is,t= 4.0s,
The angular speed is,ω= 24 * (rad)/s
The initial angular momentum of the propeller is,I₀
The angular acceleration is found by the relation;
[tex]\rm \tau = I \times \alpha \\\\ \alpha =\frac{\tau}{i} \\\\ \alpha =\frac{4.0}{2.0} \\\\ \alpha= 2.0 \ rad/sec^2[/tex]
The initial angular velocity is found as;
[tex]\rm \omega_f = \omega_0 + \alpha t \\\\ \omega_0 = \omega_f -\alpha t \\\\ \omega_0 =24 -[(-2.0)\times 4.0)] \\\\ \omega_0 = 16 \ rad/sec[/tex]
The initial angular momentum of the propeller is found as;
[tex]\rm L_0 = I \omega_0 \\\\ L_0 = 20 \times (1.6) \\\\ I_0 = -32 \ kgm^2/s[/tex]
Hence,the initial angular momentum will be 32 kg m²/s.
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Answer: 14 kg•m2/s
Explanation:
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An ideal gas, initially at a volume of 2.4 L and
pressure of 5 kPa, undergoes isothermal expansion until its volume is 6 L and its pressure
is 2 kPa.
A) Calculate the work done by the gas during
this process.
Answer in units of J.
B) find the heat added to the gas during this process.
Answer in units of J.
(a) The work done by the gas during this process is -10.8 J.
(b) The heat added to the gas during this process is 10.8 J.
Work done by the gas against an external pressureThe work done by the gas during the isothermal expansion is calculated as follows;
W(net) = ΔP x ΔV
W(net) = (2 kPa - 5 kPa) x (6L - 2.4 L)
W(net) = (-3kPa) x 3.6L
W(net) = -10.8 kPa.L
W(net) = -10.8 J
Heat added to the gasW = - Q
-10.8 J = -Q
Q = 10.8 J
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We can see the object due to
Answer:
we can see object due to reflection of light.
closed circuit
open circuit
positive end
lightbulb
battery
negative end
battery
lightbulb
break
direction of current
View the images of and open and closed circuit.
a. Explain why the light bulb goes out in the second image. Use the term electron in
your answer.
b. Give an example of a way that we can control the flow of electricity in circuits
around the home.
A. the light bulb goes out once the circuit is open since it causes the flow of electricity to cut off. the light bulb dosent get the energy it needs to light up
Explanation:
B. a simple example of this in our every day life is a light switch. when you switch the light on then the circuit is closed and the energy transfers to the light bulb, when u switch the light off then you cut off the lights source of energy which causes the light to turn off.
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
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Answer:
1 A 2 d 3 b. okjajsnsnzbsbsbsbsbExplanation:
okk
Which of the following best describes how a climate change affects the organisms in a certain environment? (2 points) Group of answer choices They might have more resources that help them survive. The will move to a new location where resources are available. They will struggle to survive due to reduced space. They might adapt, move to new place, or struggle to survive.
Answer:
they might adapt or move to a new place
Explanation: