Why do metals conduct electricity?
A. The electrons in metals are inside the nuclei of the atoms.
B. All covalent bonds conduct electricity.
C. A lattice of ions allows valence electrons to move easily. ✓
Free electrons help the electricity to spread all over the metal,making it a good conductor of electricityD. Metals never give up electrons.
The products have different p --------- to the reactants.
The products have different arrangement of atoms to the reactants.
What are products and reactants?Products are substances which are produced from the chemical changes that occur in the substances.
Reactants are the substances which form products as a result of chemical changes that occur in them.
The reactants and products in a chemical reaction contain the same atoms, but the arrangement of their atoms differs.
Therefore, the products have different arrangement of atoms to the reactants.
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32. A ball is going to fall downward through a vacuum chamber. If it has maximum potential energy at the top and maximum kinetic energy at the
bottom where along the fall will half of its maximum velocity occur?
A: At exactly halfway down
B: At more than halfway down (between halfway and the bottom)
C: At less than halfway down (between halfway and the top)
Half maximum velocity occurs at the point of half maximum kinetic energy which is exactly halfway down.
Conservation of energyThe principle of conservation of energy states that energy can neither be created nor destroyed but can be converted from one form to another.
M.A = K.E + P.E
At the maximum height, the kinetic energy of the ball while potential energy is maximum.
At the half-way down, the ball kinetic energy of the ball is equal to the potential energy.
Thus, half maximum velocity occurs at the point of half maximum kinetic energy which is exactly halfway down.
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Which of the following is NOT a source of water pollution?
a. factory runoff
c. fertilizers
b. washing your car
d. oil spills
HELP!!!!!!!!!!!!!!!!!!! Which best describes an example of a p-type semiconductor?
It uses arsenic so that electrical conduction is due to the movement of electrons.
It uses arsenic so that electrical conduction is due to the movement of a positive charge.
It uses boron so that electrical conduction is due to the movement of electrons.
It uses boron so that electrical conduction is due to the movement of a positive charge.
UPDATE: THE ANSWER IS D
Answer:
D
Explanation:
The best description of a p-type semiconductor is It uses boron so that electrical conduction is due to the movement of a positive charge.THe correct option is D.
What is a p-type semiconductor?A p-type semiconductor is created by doping a pure semiconductor material, such as silicon, with an impurity that has one less electron than the semiconductor. Boron, which has three valence electrons, is commonly used as a dopant to create p-type semiconductors.
When boron atoms are introduced into a pure semiconductor material such as silicon, they create "holes" in the crystal lattice structure. These holes can be thought of as vacancies where an electron would normally be. The holes are positively charged and can move around the crystal lattice structure. When an electric field is applied to the p-type semiconductor, the holes move towards the negative electrode, and this movement of holes is what causes electrical conduction in a p-type semiconductor.
Therefore, the statement that best describes an example of a p-type semiconductor is "It uses boron so that electrical conduction is due to the movement of a positive charge."
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reasons why X-rays are used in crystallization
Answer:
The reason X-rays are used in this process is because the clouds of electrons are at the same scale as the X-ray radiation wavelength. This means that the radiation is deflected and scattered by the electrons of the atoms in the crystal. The deflected X-ray beams produce a scattering distribution which is proportional to the scattering angle.
Explanation:
Answer:
Because X-rays have wavelengths similar to the size of atoms, they are useful to explore within crystals. Thus, since X-rays have a smaller wavelength than visible light, they have higher energy. With their higher energy, X-rays can penetrate matter more easily than can visible light.
Explanation:
2. Which of the following is NOT true of work?
(A) It is the scalar product of force and displacement.
(B) It is measured in joules.
(C) It has the same units as energy.
(D) It is a vector which is always in the same direction as the displacement.
(E) It takes energy to perform work
Answer:
D
Explanation:
Work is not a vector but it is a scalar
Answer:
D
Explanation:
D. its is a vector which is always in the same direction as the displacement
........................................................................answer?
if weight AB is compressed by 5% of its current length and all joints are free moving, what effect will raising the hook by exactly 1 meter have on it?
Raising the hook, or load by exactly 1 meter, will allow the length of the compressed material regain its original length, provided it wasn't deformed by the 5% compression.
Hooke's law
Hooke's law states that the force applied to an elastic material is directly proportional to the extension of the material provided that the elastic limit of the material is not exceeded.
When the length of the material is compressed by 5%, the material will regain its original size and shape when the applied load is removed, if the material was not deformed by the compression.
Thus, raising the hook, or load by exactly 1 meter, will allow the length of the compressed material regain its original length, provided it wasn't deformed by the 5% compression.
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A horse ran 600 m in a time of 33 s. What was the average speed of the
horse?
Explanation:
Distance : 600 m
Time : 33 seconds
Average Speed : ?
[tex]Av. Speed = \frac{Distance }{Time} \\ = \frac{600}{33} [/tex]
Simplify
[tex]Av. Speed = 18.18181 \\ = 18 \: m {s}^{ - 1} [/tex]
according to the law of conservation of momentum, when objects collide in the absence of friction
Answer:
When two objects collide, in the absence of any additional external forces acting on the pair of objects, momentum is conserved precisely because the collision is just an interaction between the two objects. That is, it's a Newton's third law problem.What do I need to build a time machine to turn time back.. or who knows someone who has information to do so..
Please help me understand this
Answer: Can't see the photo clearly.
Three equal in magnitude charges are located at the corners of an equilateral
triangle of side r. The charges A and C are positive and charge B is negative.
What is the direction of the net force on charge C due to charges A and B?
(A) up to the right
(B) up
(C) right
(D) down
The direction of the net force is up.
Net force on the chargesThe net force on the charges can be determined using Coulomb's law as follows;
[tex]F_{AC} = + \frac{KQ^2}{r^2}[/tex]
[tex]F_{BC} = - \frac{KQ^2}{r^2}[/tex]
F(net) = F(AC) + F(BC)
F(net) = 0
The, direction of the net force on charge C will be parallel to charge C to achieve a zero net force. Thus, the direction of the net force is up.
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Circle the letter of the correct answer.
1.) c
2.) d
3.) d
4.) b
5.) c
Your washer has power of 450 watts, and your dryer has a power of 3000
watts. How much energy do you use to clean a load of clothes in 1 hour of
washing and 1.5 hours of drying?
Answer:
4950 watt hours.
Explanation:
450*1 + 3000*1.5 = 4950w
what is mirror formula??
[tex] \huge \frac{1}{v} + \frac{1}{u} = \frac{1}{f}[/tex]
where,
v:distance of the image from the lens
u:distance of the object from the lens;
f:focal length,
A ball of mass M and speed of V collides head on with a ball of mass 2M and a speed of v/2, as
shown above. If the two balls stick together, their speed after the collision is
Answer:
2/3V
Explanation:
Given that a ball of mass M and speed V collides with another ball of mass 2M and velocity v/2 . After collision they stick together and we need to find their speed after collision . According to Law of Conservation of Momentum , The total momentum of the system before and after collision is constant .That is ;
[tex]\sf\qquad\longrightarrow m_1u_1+m_2u_2=m_1v_1+m_2v_2\\ [/tex]
[tex]\sf\qquad\longrightarrow MV + 2M\bigg(\dfrac{V}{2}\bigg) = (2M + M)(v)\\ [/tex]
[tex]\sf\qquad\longrightarrow MV +MV= 3Mv\\[/tex]
[tex]\sf\qquad\longrightarrow 2MV = 3Mv\\ [/tex]
[tex]\sf\qquad\longrightarrow v =\dfrac{2M}{3M}V\\ [/tex]
[tex]\sf\qquad\longrightarrow \pink{ v_{after\ collision}=\dfrac{2}{3}V }[/tex]
Hence the velocity after the collision ia 2/3V .
Pleeasse solve it ill give brainliest please
Answer:
a) 210 Ω
b) 21 V
c) 0.07 A, 0.03 V
d) VAE = 7 V
VEB = 14 V
VAF = 9 V
VFB = 12 V
Explanation:
a) 100 Ω and 200 Ω are in series, equivalent = 100 + 200 = 300 Ω,
300 Ω and 400 Ω are in series, equivalent = 300 + 400 = 700 Ω
300 Ω and 700Ω are in parallel, so the equivalent resistance between A and B is R where
1/300 + 1/700 = 1/R, get R = 210 Ω
b) Given I = 0.1 A
so VAB = I * R = 1 * 210 = 21.0 V
c) I₁ + I₂ = I = 0.1, so I₂ = 0.1 - I₁
I₁ * 300 = I₂ * 700
I₁ * 300 = (0.1 - I₁) * 700
get I₁ = 0.07 A, I₂ = 0.1 - I₁ = 0.03 A
d) VAE = I₁ * 100 = 7 V
VEB = I₁ * 200 = 14 V
VAF = I₂ * 300 = 9 V
VFB = I₂ * 400 = 12 V
How large is the acceleration of a 35-kg mass that has a net force of 270 N applied to it horizontally? Write units as well.
We will find the acceleration using the formula of force. The formula states that the net force applied on an object is directly proportional to the product of mass of the body and the acceleration of the body...
[tex] \mathcal{F = MA}[/tex]
Where,
F is forceM is massA is accelerationIn our case,
F = 270 NM = 35 kgA = Unknown[tex]\large\underline{\underline{\maltese{\orange{\pmb{\sf{\: Solution :-}}}}}}[/tex]
[tex] \green \leadsto \purple{ \tt 270 = 35 \times a}[/tex][tex] \green \leadsto \purple{ \tt 270 = 35 a}[/tex][tex] \green \leadsto \purple{ \tt 35a = 270}[/tex][tex] \green \leadsto \purple{ \tt 35a \div 35 = 270 \div 35}[/tex][tex] \green \leadsto \purple{ \tt a = 7.7 \: {m/s}^{2} }[/tex]➪ Therefore, The acceleration of the body is 7.7 m/s²...~
According to the given statement The acceleration of the body is 7.7 m/s².
What is acceleration?Acceleration refers to the rate at which speed and direction of velocity vary over time. A point or object moving straight ahead is pushed when it accelerates or decelerates. Even though the speed is constant, movement on a circle accelerates so because direction is constantly shifting.
Briefing:F is force = 270N
M is mass = 35 kg
A is acceleration = unknown
F = m* a
270 = 35 * a
270 = 35a
35a = 270
a = 270/35
a = 7.7 m/s².
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Hi if you know the answer could you please put it below thank you x
Answer:
If the athlete speeds up between 2 points there is an increase of the athlete's "kinetic" energy
I guess this would imply a decrease in the athlete's chemical energy because the energy has to originate somewhere
A ball is thrown upwards. Neglecting air resistance, what initial upward speed does the ball need to remain in the air for a total time of 10 seconds
Answer:
H = 1/2 g t^2 time to reach top of trajectory
v = g t time to reach top of trajectory when v is initial speed upwards
v = 5 g = 49 m/s 5 sec upwards and 5 sec downwards
What is the maximum possible age of the universe if H0=80km/s/Mpc
If a car with a mass of 1,200 kg traveling westward at 30 m/s is
slowed to a stop in 3 s, then what was the net force acting on
the car?
The net force acting on the car is equal to -12000 Newton.
Given the following data:
Mass = 1,200 kgInitial velocity = 30 m/s.Final velocity = 0 m/s (since the car came to a stop).Time = 3 seconds.To determine the net force acting on the car:
How to calculate the net force.Mathematically, the net force acting on the car is given by Newton's Second Law of Motion:
[tex]F = \frac{m(v\;-\;u)}{t}[/tex]
Where:
m is the mass.t is the time.u is the initial velocity.u is the final velocity.Substituting the given parameters into the formula, we have;
[tex]F = \frac{1200 \times (0\;-\;30)}{3}\\\\F = \frac{1200 \times (-30)}{3}\\\\F = \frac{-36000 }{3}[/tex]
Net force = -12000 Newton.
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Calculation on simple pendulum
Answer:State the question so I can answer
Explanation:
How many kilograms of sour cream should be added (stirred into the water) to 0.5 litres of water at T=80°C to cool the water to 40°C, which is the ideal temperature for soup if the temperature of the sour cream (sour cream 20%) before it is added to the soup is 5°C?
The mass of the sour cream that should be added is 0.68 kg.
Mass of the water
Mass of the water is calculated as follows;
mass = density x volume
density of water = 1 kg/Lmass = (1 kg/L) x 0.5 L = 0.5 kg
Conservation of energyHeat gained by the sour cream = Heat lost by the water
[tex]m_s c_s\Delta \theta _s = m_wc_w\Delta \theta _w\\\\m_s = \frac{m_wc_w\Delta \theta _w}{c_s\Delta \theta _s} \\\\[/tex]
where;
Cs is specific heat of sour creamCw is specific heat of waterΔθ is change in temperature[tex]m_s = \frac{0.5 \times 4184 \times (80 - 40)}{3510 \times (40 - 5)} \\\\m_s = 0.68 \ kg[/tex]
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Please help me find this answer
Answer:
155/62 = 2.5
Mass/Volume = Density
Density= 2.5
Explanation:
For a science experiment, Anne observed that 9 out of 27 plants had sprouted. Which fraction is equivalent to 9/27?
2/3
1/3
1/9
1/27
Answer:
1/9
Explanation:
9/27 3 can go in both way
The average distance from earth to the sun is 150,000,000 km what is the name of the unit scientists created that is equal to the distance from earth to the sun
Answer: The name of the unit is A.U's(Astronomical unit)
Explanation:
HELLLPPPPPP PLEASEEEE ANSWWERRR THE QUESTION USING PHET's COULOMB'S LAW SIMULATION:
Question:
How does changing the charge’s value influence the force between the two charges?
is it a multi or is it writing
How would the products of electrolysis be different is a solution of zinc chloride was used instead of molten zinc chloride?
Answer:
The electrolysis of zinc chloride shows how an ionic salt will conduct electricity when molten, but not when solid.
Explanation:
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