Answer:
420 s
Explanation:
The smallest molecules are made up of -
a. 1 atom
b. 2 atoms
c. 3 atoms
The largest molecules are made up of -
a. billions
b. millions
c. hundreds
d. thousands
- of atoms.
What is the relationship between the valence electrons of an atom and the chemical bonds the atom can form?
Answer:
Valence electrons are outer shell electrons with an atom and can participate in the formation of chemical bonds. In single covalent bonds, typically both atoms in the bond contribute one valence electron in order to form a shared pair. The ground state of an atom is the lowest energy state of the atom.
12. Which of the following statements is accurate?
A. If an object's velocity is changing, it's experiencing either acceleration or deceleration.
B. If an object's velocity decreases, then the object is accelerating
C. If an objects said to be decelerating, its velocity must be increasing,
D. If an object's velocity remains constant, its acceleration must be increasing.
Answer:
Option (a) is correct
Explanation:
The acceleration of an object is defined as the rate of change of velocity. Mathematically, it can be written as :
[tex]a=\dfrac{v-u}{t}[/tex]
Where
v and u are final and initial velocity
It is clear that if there is some change in velocity, it means the object is experiencing either acceleration or deceleration. Hence, the correct option is (a).
Answer:
a
Explanation:
The brick wall (of thermal conductivity
1.16 W/m ° C) of a building has dimensions
of 5 m by 7 m and is 18 cm thick.
How much heat flows through the wall in
a 17.2 h period when the average inside and
outside temperatures are, respectively, 24°C
and 8°C?
Answer in units of MJ.
Answer:223.46 MJ
Explanation:
Given
The thermal conductivity of brick wall is [tex]k=1.16\ W/m.^{\circ}C[/tex]
Cross-section of Wall [tex]A=5\m \times 7\ m[/tex]
time period [tex]t=17.2\ h=17.2\times 60\times 60=61,920\ s[/tex]
Inside temperature [tex]T_i=24^{\circ}C[/tex]
Outside temperature [tex]T_o=8^{\circ}C[/tex]
Heat transfer through the bricks
[tex]\dot{Q}=kA\dfrac{dT}{dx}[/tex]
[tex]\dot{Q}=1.16\times 35\times \dfrac{16}{0.18}\\\\\dot{Q}=3608.88\ W[/tex]
Heat flow for 17.2 h
[tex]Q=3608.88\times 61,920=223.46\ MJ[/tex]
Fig. 2.1 shows a hammer being used to drive a nail into a piece of wood.
hammer head
-nail
wood
Fig. 2.1
The mass of the hammer head is 0.15 kg.
The speed of the hammer head when it hits the nail is 8.0m/s.
The time for which the hammer head is in contact with the nail is 0.0015s.
The hammer head stops after hitting the nail.
(a) Calculate the change in momentum of the hammer head.
Answer:
ΔP = - 1.2 Ns
Explanation:
The change in momentum of the hammer head can be given as follows:
[tex]\Delta P = P_f - P_i\\[/tex]
where,
ΔP = Change in Momentum = ?
Pf = Final Momentum
Pi - Initial Momentum
Therefore,
[tex]\Delta P = mv_f - mv_i\\\Delta P = m(v_f - v_i)[/tex]
where,
m = mass of hammer head = 0.15 kg
vf = final speed of hammer = 0 m/s
vi = initial speed of hammer = 8 m/s
Therefore,
[tex]\Delta P = (0.15\ kg)(0\ m/s-8\ m/s)[/tex]
ΔP = - 1.2 Ns
Name the type of component that has a greater resistance as the current through it increases
Answer:
filament bulb, filament lamp
Explanation:
More length of a wire is a component that has a greater resistance as the current through it increases.
The resistance of a long wire is greater than the resistance of a short wire because electrons collide with more ions present in the wire as they pass through. The moving electrons can collide with the ions present in the metal.
This makes more difficult for the current to flow and causes resistance in the wire so we can conclude that more length of a wire is a component that has greater resistance as more current passes through it.
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When dropping a grape and a bowling ball from a height, the force of gravity would be identical on each object. True or False
A.
FALSE
B.
TRUE
Answer:
I think true but im not sure sorry if this didnt help/
Explanation:
Answer:
true 50%
Explanation:
Which is denser?
The water in a swimming pool or a quarter (coin).
Answer:
The coin is denser than any of the liquids, and will sink through everything. The oil is the least dense liquid, so it will float on the water, and the syrup is the densest liquid, so it will sink below the water.
Explanation:
cute copy and paste? ☏ ♡ ☆⋆◦★◦⋆°*•°
. * . . ° . ● ° .
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★ ★°★ . * . °☆ . ● . ★ ° . • ○ ● . ☆ ★ ° ☆ ¸. ¸ ★ . • ° . *
¸ . ★ ° :. :. . ¸ . ● ¸ ° ¸. * ● ¸ °☆
☆ °☆ . * ● ¸ . ★¸ .
. * . . ° . ● ° .
° :. ° . ☆ . . • . ● .° °★ Not sure how to copy and paste? Just right click your mouse and choose copy in options, to release repeat the process and just paste it. No mouse? Select the text with your computer pad and use ctrl c to release, ctrl v. On mobile? Press on your screen and select the text, use the option copy and paste wherever you would like!
You can use the information below to calculate it :)
Density of water: 1000 kg/m3.
Density of the coin: copper 8.96 g/cm^3
nickel 8.90 g/cm^3
1 kg = 1000 g
All you have to do now is convert it and thats it
Solutes dissolve quicker in _________ water.
warm
cold
cool
In which of these can convection not occur
A. Gases
B.solids
C.liquids
D.fluids
I believe the answer would be B.solids.
Explanation:
Hope this helped!
In solids these can convection not occur and convection can occur in both liquids and gases, as they are both considered fluids. Thus, option B is correct.
However, convection cannot occur in solids, as the particles in solids are generally fixed in position and do not have the freedom to move and transfer heat through bulk motion as in convection.
A solid is one of the three fundamental states of matter, along with liquids and gases. It is characterized by having a definite shape and volume. Solids are composed of tightly packed particles, such as atoms, molecules, or ions, that are held together by strong intermolecular forces.
These particles vibrate in fixed positions but do not have the ability to move freely throughout the substance. As a result, solids maintain their shape and volume under normal conditions and exhibit relatively low compressibility compared to gases and liquids. Examples of solids include metals, rocks, wood, plastics, and ice.
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Imagine that there is no friction for a day .Make a list if things that it would not be possible for you do.Which things would still be possible
Answer:
1. We cannot walk .
2. We will not get a grip to hold things, then we cannot eat,write,Hold pen or pencil etc.
3. Moving things cannot be stopped.
4.Buildings cannot be constructed.
5. We cannot fix a nail to the wall.
6.We cannot stand properly without a grip.
7.we would keep slipping.
8.Nothing will be steady on ground. , things will not be at a proper places because of no grip.
9.Brakes in the car / vehicles will be useless.
10. Finally all the things, including us will be floating in the air.
Explanation:
Hope that helps
Does Direction matter when you are measuring momentum
Answer:
Yes
Momentum is a vector quantity
Explanation:
A vector quantity is a quantity that has both magnitude and direction
So definitely direction matters
Answer:
no on edge 2021
Explanation:
A heavy piano is pushed up an inclined plane into a moving van. Which of the following choices best explains how the inclined plane made the task easier?
1. The force needed to move the piano up the plane was less than the force needed to lift it straight up into the van, but the distance over which the piano moved was greater.
2.The force exerted on the piano was the same as if it had been lifted, but the distance it needed to be move decreased, so the total work decreased.
3.The distance that the piano was moved was less that the distance it would have had to be lifted, so the total work decreased.
4. The amount of force need to push the piano up the ramp is the same as the force needed to lift it, so the amount of work remained the same.
The term mechanical advantage has to do with the ratio of the load to the effort.
What is mechanical advantage?
The term mechanical advantage has to do with the ratio of the load to the effort. There is a mechanical advantage when the effort applied is less than the load.
Hence, the task is made easier because the force needed to move the piano up the plane was less than the force needed to lift it straight up into the van, but the distance over which the piano moved was greater.
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A wave has a wavelength of 2 meters and a frequency of 1.5 hz. What is its speed
Answer:
3m/s is the answer.
Explanation:
f = c/λ
f = frequency
c = speed (m/s)
λ = wavelength
f = c/λ
1.5 = c/2
c = 3m/s
what is a hydraulic system
Explanation:
Hydraulic systems use the pump to push hydraulic fluid through the system to create fluid power. The fluid passes through the valves and flows to the cylinder where the hydraulic energy converts back into mechanical energy. The valves help to direct the flow of the liquid and relieve pressure when needed
~ is the following statement true or false? Explain your answer.
“Energy from the sun tends to affect only a small part of Earth's system."
Answer: False
Explanation: The sun is one of earths primary energy sources. Without the sun, all animals, plants, humans would die. The sun's energy provides warmth for humans and plants and animals cannot grow without the sun.
The statement "Energy from the sun tends to affect only a small part of Earth's system" is false.
What energy comes from the sun to Earth?The sun emits several forms of energy, including visible light, ultraviolet radiation, infrared radiation, and X-rays. Of these, visible light is the most abundant form of energy that reaches the Earth's surface.
The visible light from the sun provides the energy that drives the Earth's climate and weather patterns, powers photosynthesis in plants and algae, and is responsible for the colors we see in the world around us.
In addition to visible light, the sun also emits ultraviolet (UV) radiation. Some of this UV radiation is absorbed by the Earth's atmosphere, which helps to protect us from its harmful effects, but some of it reaches the Earth's surface and can cause skin damage and other health problems.
The sun also emits infrared radiation, which is responsible for heating the Earth's surface and atmosphere. This heat is important for the Earth's climate and weather patterns and is also used to generate electricity in solar power plants. The energy from the sun is essential for life on Earth and has a major impact on virtually every aspect of the Earth's system.
Here in the Question,
Energy from the sun has a major impact on the entire Earth system, from the atmosphere to the oceans to the land surface. The energy from the sun drives the Earth's climate and weather patterns, it powers the hydrologic cycle and drives ocean currents, and it provides the energy for photosynthesis, which is the basis of the Earth's food chain.
The energy from the sun that reaches the Earth's surface is also responsible for many physical and chemical processes that occur in the Earth's crust and upper mantle. For example, the energy from the sun powers the movement of tectonic plates, which leads to earthquakes, volcanic eruptions, and the formation of mountains.
The energy from the sun affects virtually every aspect of the Earth's system, from the smallest microorganisms to the largest geological features.
Therefore, the statement "Energy from the sun tends to affect only a small part of Earth's system" is false.
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What is the magnitude of the electrostatic force between two electrons each having a charge of 1.6 x 10-19 C separated by a distance of 1.00 × l0– 8 meter?
A)
2.56 × 10–22 N
B)
2.30 × 10–20 N
C)
2.30 × 10–12 N
D)
1.44 × 10–1 N
Answer:
The correct option is (C).
Explanation:
The distance between two charges, [tex]d=10^{-8}\ m[/tex]
We need to find the magnitude of the electrostatic force between two electrons. The formula for the electric force between charges is given by :
[tex]F=\dfrac{kq^2}{r^2}\\\\=\dfrac{9\times 10^9\times (1.6\times 10^{-19})^2}{(10^{-8})^2}\\\\=2.304\times 10^{-12}\ N[/tex]
So, the magnitude of force is equal to [tex]2.30\times 10^{-12}\ N[/tex].
Convert 0.0779 kg to g
what is a waves frequency
Answer:
the number of times the crest of a wave hits a certain point
the more waves, the higher the frequency
Explanation:
Triply charged uranium-235 and uranium-238 ions are being separated in a mass spectrometer. (The much rarer uranium-235 is used as reactor fuel.) The masses of the ions are 3.90×10−25kg3.90×10−25kg and 3.95×10−25kg,3.95×10−25kg, respectively, and they travel at 3.0×105m/s3.0×105m/s in a 0.250-T field. What is the separation between their paths when they hit a target after traversing a semicircle? (b) Discuss whether this distance between their paths seems to be big enough to be practical in the separation of uranium-235 from uranium-238.
Answer:
[tex]0.025\ \text{m}[/tex]
Yes
Explanation:
[tex]m_8[/tex] = Mass of uranium 238 ion = [tex]3.95\times 10^{-25}\ \text{kg}[/tex]
[tex]m_5[/tex] = Mass of uranium 235 ion = [tex]3.9\times 10^{-25}\ \text{kg}[/tex]
v = Velocity of ions = [tex]3\times 10^5\ \text{m/s}[/tex]
q = Charge of triply charged ions = [tex]3\times 1.6\times 10^{-19}\ \text{C}[/tex]
B = Magnetic field = 0.25 T
The force balance is
[tex]\dfrac{mv^2}{r}=qvB\\\Rightarrow r=\dfrac{mv}{qB}[/tex]
The difference between the radius of the ions are
[tex]\Delta r=(m_8-m_5)\dfrac{v}{qB}\\\Rightarrow \Delta r=\dfrac{(3.95\times 10^{-25}-3.9\times 10^{-25})\times 3\times 10^5}{3\times 1.6\times 10^{-19}\times 0.25}\\\Rightarrow \Delta r=0.0125\ \text{m}[/tex]
Separation is given by
[tex]\Delta d=2\Delta r=2\times 0.0125\\\Rightarrow \Delta d=0.025\ \text{m}[/tex]
The separation between their paths when they hit a target after traversing a semicircle is [tex]0.025\ \text{m}[/tex].
Yes, the distance between the paths is 2.5 cm is a practical separation between as it is easily measurable.
do you know any good books about physics and math?
What is the wavelength of a sound wave
with a speed of 331 m/s and a frequency
of 500 Hz?
Answer:
0.777m
Explanation:
The sound wave has a wavelength of 0.773m.
Explanation:
To solve this problem we have to use the wave equation that is given below:
We know the frequency and the velocity, both of which have good units. All we have to do is rearrange the equation and solve for
λ :
λ = v f
Let's plug in our given values and see what we get!
λ = 340 m s
440 s − 1
λ = 0.773 m
Hope this helps, Mark as brainliest if u want
The wavelength of the sound wave is 0.662 m.
Explanation:
Given that,
The speed of a sound wave, v = 331 m/s
The frequency of the wave, f = 500 Hz
To find,
The wavelength of the sound wave.
Solution,
The speed of wave in terms of wavelength and frequency is given by :
[tex]v=f\lambda[/tex]
Where
[tex]\lambda[/tex] is the wavelength
Rearranging for [tex]\lambda[/tex],
[tex]\lambda=\dfrac{v}{f}[/tex]
Put all the values,
[tex]\lambda=\dfrac{331}{500}\\\\\lambda=0.662\ m[/tex]
So, the wavelength of the sound wave is 0.662 m.
Reference,
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A 100 watt bulb with 60 volts has a current flow of how many Amps?
Answer:
I = 1.666... amps
Explanation:
P = I*V or Power = Current * Voltage
(100 watts) = I * (60 Volts)
I = 1.666... amps
If there is a ball sitting on top of a hill with 100J of GPE. How much KE should there be at the bottom of the hill if there is no friction?
A 20 kg child is traveling 3 m/s on an amusement park ride. What is the magnitude of the child’s momentum?
Answer:
[tex]\frac{60kgm}{s}[/tex]
Explanation:
momentum = mass * velocity
= 20kg * 3m/s
= 60kgm/s
What is the power of a stereo that has an intensity of 3.5X105 W/m2 at a distance of 12.4 m
¿Cuáles de las siguientes cualidades permiten identificar un cuerpo como planeta? I) Debe ser aproximadamente esférico. II) Debe girar en torno a una estrella. III) Su velocidad debe ser constante.
Answer:
The correct answer is ii) It must revolve around a star
Explanation:
For a celestial body to be called a planet, it must meet at least three characteristics
* rotate around a star
* its mass must be sufficient to maintain hydrostatic equilibrium
* have control over its orbital that is to say to prevent that other body is in its same orbital
if we check the different proportions
i) False. Most of the planets are spheres deformed by their rotation on themselves and around the star
ii) True. It is in accordance with the minimum characteristics of the plants
iii) False .. the orbit of the planet can be elliptical and the speed changes at each point for this at a different distance from the star that is in a focus of the ellipse.
The correct answer is ii) It must revolve around a star
PLZZ HELP
If you have two objects moving at the same velocity, would the object with bigger mass have higher or lower kinetic energy?
Answer:
The kinetic energy of a moving object is directly proportional to its mass and directly proportional to the square of its velocity. This means that an object with twice the mass and equal speed will have twice the kinetic energy while an object with equal mass and twice the speed will have quadruple the kinetic energy.
मारवतन गनुहास (What Is MKS Syste
Convert 5 solar days into second.)
Answer:
5 Days to Seconds = 432000
Explanation:
The device shown below contains 2 kg of water. When the cylinder is allowed to fall 250 m, the temperature of the water increases by 1.4°C. Suppose 2 kg of water are added to the container and the cylinder is allowed to fall 750 m. What would the increase in temperature be in this case? Gizmo image A. 0.7°C B. 1.4°C C. 2.1°C D. 2.8°C
Answer:c. 2.1°C
Explanation:
I just did it
