Answer:
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↬ 78%
Explanation:
↬ Think that about 70% of the area of the earth is covered by the ocean.
↬ So the precipitation that falls on it is a smiliar percentage.
Compare the amount of work done when one man uses an ideal pulley to lift a 500 newton weight 2 meters and one man lifts a 500 newton weight 2 by hand.
Select one:
a. Depends on the number of pulleys.
b. More work is done when one man lifts the weight by hand.
c. More work is done when one man lifts the weight using a pulley.
d. The amount of of work is the same with or without the lifting pulley.
More work is done when one man lifts the weight using a pulley. Option C is correct.
What is mechanical advantage ?Mechanical advantage is a measure of the ratio of output force to input force in a system, it is used to obtained efficiency of forces in levers and pulley.
It is an effective way of amplify the force in simple machines like lever The theoretical mechanical advantage is defined as the ratio of the force responsible for the useful work in the system to the applied force.
More work is done when one man lifts the weight using a pulley. With the pulley, the mechanical advantage is increasing.
Hence, option C is correct.
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What is the equilibrium constant for the following reaction at 25 °c?
The equilibrium constant for the provided reaction at the temperature of 25 degree Celsius is 1/20.
What is equilibrium constant?
The equilibrium constant in a chemical reaction is the reaction quotient when the chemical reaction is at equilibrium constant.
The equilibrium constant for the for reaction at 25 °c given in the problem as,
[tex]2A\rightleftharpoons B+C, K_1=1.0 \\2B\rightleftharpoons C+D, K_2=16 \\2C+D\rightleftharpoons 2P, K_3=25 \\[/tex]
Now, the reaction for which the equilibrium constant at 25 °c has to be find out is,
[tex]P\rightleftharpoons A+\dfrac{1}{2}B[/tex]
[tex]K_4=\sqrt{\dfrac{1}{K_1}+\dfrac{1}{K_2}+\dfrac{1}{K_3}}\\K_4=\sqrt{\dfrac{1}{25}+\dfrac{1}{16}+\dfrac{1}{1}}\\K_4=\dfrac{1}{20}[/tex]
Thus, the equilibrium constant for the provided reaction at the temperature of 25 degree Celsius is 1/20.
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Where in the galaxy are the most stars born?
Answer: Stars are formed in dust clouds and are found in most galaxies.
Explanation:
Answer: Stars form inside relatively dense concentrations of interstellar gas and dust known as molecular clouds.
Explanation:
What causes a moonbow to occur? Reflection and refraction of moonlight Collisions of gaseous particles of Earth's atmosphere with charged particle released from the sun's atmosphere Extra-terrestrial life forms Solar flares in the night sky
A moonbow is occurred due to reflection and refraction of moonlight.
What is Moonbow?A moonbow also known as a lunar rainbow. It is the phenomenon occurs when the moonlight is refracted through water droplets in the air. The amount of light available from the full moon is very less than that produced by the sun. So, the moonbows are the type of rainbow, produced by the moonlight refraction and reflection through water droplets. Moonbows are fainter than rainbows.
Thus, a moonbow is occurred due to reflection and refraction of moonlight.
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A 2400 kg satellite is in a circular orbit around a planet. The satellite travels with a constant speed of 6000 m/s. The radius of the circular orbit is 10 6 m
The magnitude of the gravitational force exerted on the satellite by the planet will be F = 11970.1 N
What is gravitational force?
The gravitational force is a force that attracts any two objects with mass.It is directly proportional to the masses and inverse of the distance between the two objects.
It is given that,
Mass of the satellite, m = 2400 kg
Speed of the satellite, v = 6670 m/s
Radius of the circular path,
Let F is the magnitude of the gravitational force exerted on the satellite by the planet. The centripetal force is equal to the gravitational force. It is equal to :
[tex]F=\dfrac{mv^2}{r}[/tex]
[tex]F=\dfrac{2400\times (6670)^2}{8.92\times 10^6}[/tex]
F = 11970.1 N
So, the magnitude of the gravitational force exerted on the satellite by the planet is 11970.1 N. Hence, this is the required solution.
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Gina applied 1,780 J of work to move a sofa 3.8 meters. What amount of force did she exert?
Answer:
468.42N
Explanation:
Here,
Work done(W)=1780J
Displacement(s)=3.8m
As we have,
Work=Force×displacement
Now,
[tex]\hookrightarrow 1780J=F\times3.8m\\\\\hookrightarrow \frac{1780J}{3.8m} =F\\\\\hookrightarrow F=468.42N[/tex]
A 24 V battery is connected to a voltage divider circuit consisting of a 1 resistor and a 2 resistor. What is the voltage across the 2 resistor?
Answer:
8 V
Explanation:
Equivalent R
1/1 + 1/2 = 1/R3/2 = 1/RR = 2/3ΩFinding Current
I = V/RI = 24/2I = 12AFinding V
V = 12 * 2/3V = 8 VWhat would happen to a plastic pop bottle full of air if it were taken 1000 m below the surface of the ocean? What would happen to it if it were taken 10 000 m into the atmosphere? Explain your answer.
Answer:
if it were submerged 1000 m in the ocean it would be crushed because of the differences of the air and water pressure.
If it were taken 10,000 m (higher than Mt Everest) it would explode due to the differences of external and internal air pressures.
For nitrogen to be a liquid, its temperature must be within 12.78 °f of –333.22 °f. the equation |x 333.22 | = 12.78 can be used to find x, which represents the maximum and minimum temperatures at which nitrogen is a liquid. is the maximum temperature at which nitrogen is a liquid. is the minimum temperature at which nitrogen is a liquid.
The maximum temperature is -320.44 and the minimum temperature is -333.22.
How is the temperature variation calculated?In this case, there was an increase of 50 °C in the temperature of this object. We say that the temperature variation suffered by the body was 50°C, and this can be determined mathematically through the difference between the final value and the initial temperature value (60 – 10 = 50).
In this case, we have:
[tex]x+ 333.22 = 12.78\\x=12.78-333.22\\x=-320.44[/tex]
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-320.44 is the maximum temperature at which nitrogen is a liquid.
-346 is the minimum temperature at which nitrogen is a liquid
A circuit has three resistors (12 omega,25 omega, and 62 omega) connected in series. the potential difference across the 12 - omega resistor is 4. 4v. what is the potential difference across (a) the 25-omega resistor and (b) the 62-omega resistor ?
Answer:
Since the resistors are in series, all of them carry the same current I.
if the potential drop across the 12 Ω is 4 V
I = 4 / 12 = 1/3 = .333 amp
a) 25 Ω * .333 amp = 8.33 V
b) 62 V * .333 amp = 20.7 V
What is the potential at a distance of 5. 0 ? 10-10 m from a nucleus of charge 50e?
The electric potential at a distance from a nucleus of charge 50e is 144 Volts.
What is electric potential?The potential is the work done by the test charge to move it from infinity to a particular point.
The potential is given by the relation
V = kQ / r
The distance of a point from the nucleus is 5.0 × 10⁻¹⁰ m and the charge on the nucleus is 50 e = 50 × 1.9 × 10⁻¹⁹ C.
k = 9 × 10⁹ kg-m²/s²-C²
Here, Q is the charge, r is the distance and k is the constant.
Substituting the value into the equation and solving, we get
V = 144 Volts
Thus, the potential at a distance from a nucleus of charge 50e is 144 Volts.
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Find the equivalent resistance of this circuit.
Answer:
320
Explanation:
Group R1 and R2
Then group R1'2 with R3
Explaination :
Here the given circuit is both in series and parallel. So we would be first calculating the total resistance in series.
Rs = R1 + R2 .... n
Rs = 100Ω + 220Ω
Rs = 320Ω
Therefore, resistance in series combination is of 320Ω.
Now, the circuit would be combined in parallel.
As we know that,
1/Rp = 1/R1 + 1/R2 +... 1/n>> 1/Rp = 1/320 + 1/320
>> 1/Rp = 1 + 1 / 320
>> 1/Rp = 2 / 320
>> 1/Rp = 1 / 160
Cross multiplying them,
>> Rp = 160Ω
Therefore,
Equivalent resistance of circuit is of 160ΩWhich characteristics describe whether a cell contains a nucleus?.
Answer:
the above picture might help
Points a and b are nearby a proton in otherwise empty space. the potential is chosen to be zero very far away from the proton. the potential at a is half as much as the potential at b. compared to the electric field energy density at b, the electric field energy density at a is __
Compared to the electric field energy density at b, the electric field energy density at a is large by a factor of 16.
What is potential energy?The energy of a particle by virtue of its position.
The potential at B = Vb =V
Vb = 1/4π∈₀ x e/r₁ = ke/r₁
V =ke/r₁
and r₁ = ke /V
The potential at A = Va = 2V
2V = ke/r₂
r₂ = ke/2V
The electric field at point B. Eb = ke/r₁²
Substitute the value of r₁, we get
Eb = V²/ke
The electric field at point A , Ea = ke /r₂²
Substitute the value of r₂, we get
Ea = 4V²/ke
The electric field energy density at point A and B,
Ua = 1/2 ∈Ea²
Ub = 1/2 ∈Eb²
electric field energy density is proportional to the square of electric field at the particular point.
Ua/Ub =(Ea/Eb)²
Substitute the values, we get
Ua/Ub = 16
Thus, compared to the electric field energy density at b, the electric field energy density at a is large by a factor of 16.
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100 POINTS!! PLEASE HELP ASAP. WILL MARK BRANLIEST.
3.) You inspect a bottle of sunscreen to see what radiation it claims to block. You are looking for sunscreen that blocks dangerous radiation from the sun but does not make claims about other types of radiation. Which claim on a bottle would best meet these criteria?
a.Blocks all UV and infrared rays
b.Blocks harmful UVA and UVB radiation
c.Blocks the full spectrum of violet and ultraviolet radiation
d.“Blocks harmful UV and gamma rays
4.) Which description fits a type of electromagnetic radiation that could harm living cells?(1 point)
a. electromagnetic waves with very short wavelengths
b. waves with frequencies low enough that they are not visible
c. radio waves
d. blue light
5.) Which statement correctly describes how a tanning bed machine works?(1 point)
a. It gradually increases the ionizing energy of radiation to the maximum.
b. It matches the amount of sunlight that the skin can absorb..
c. It decreases production of the skin’s protective pigment, which causes damage.
d. It delivers an ionizing electromagnetic radiation called ultraviolet light.
7.) Tanning beds expose the body to a certain type of ultraviolet (UV) light. It has been claimed that this helps the body manufacture its needed vitamin D. Which evidence contradicts this claim?(1 point)
a. Both UVA and UVB light are produced by tanning beds.
b. The skin does not have the ability to absorb any type of UV light.
c. The body needs UVA light, and tanning beds deliver UVB light.
d. The body needs UVB light, and tanning beds deliver UVA light.
8.) Studies show that matter absorbs various types of electromagnetic radiation depending on the frequency and amount of energy they carry. Which sequence of types of electromagnetic radiation is arranged from that with the least to the most energetic photons?(1 point)
a. gamma rays, visible light, ultraviolet, X-rays
b. visible light, ultraviolet, X-rays, gamma rayst
c. ultraviolet, X-rays, gamma rays, visible light
d. X-rays, gamma rays, visible light, ultraviolet
Answer:
the answer is equal to visible light , ultraviolet, x-rays, gamma rayst
The sequence of types of electromagnetic radiation is arranged from that with the least to the most energetic photons will be visible light , ultraviolet, x-rays, gamma rays.
What is electromagnetic radiation?Electromagnetic radiation is a type of energy that is transmitted in incident photons as both magnetic and electric waves.
Electromagnetic radiation has a spectrum with varying wavelengths and frequencies, which gives it different properties.
Electromagnetic radiation is a type of energy that travels in packets of energy called photons as both electrical and magnetic waves.
Wave-particle duality is the name given to this phenomenon. This is a notion that defines how a wave behaves whether it behaves like particles, waves, or both particles and waves.
Hence the sequence of types of electromagnetic radiation is arranged from that with the least to the most energetic photons will be visible light , ultraviolet, x-rays, gamma rays.
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Can someone please answer this, ill give you brainliest Would be very appreciated.
The fact that water is attracted to itself, a property called (options adhesion, cohesion, surface tension), leads to another important property, the liquid form of water is (options less, more, equally) dense than the solid form. As water solidifies into ice, the molecules must move apart in order to fit in to a crystal lattice structure, causing water to expand as it freezes. Because of this, (options ice floats, ice sinks, ice forms at the surface then sinks) and water sinks, which keeps the oceans liquid and prevents them from freezing solid from the bottom up.
Answer:
See below ~
Explanation:
The fact that water is attracted to itself, a property called cohesion, leads to another important property, the liquid form of water is more dense than the solid form. As water solidifies into ice, the molecules must move apart in order to fit in to a crystal lattice structure, causing water to expand as it freezes. Because of this, ice floats and water sinks, which keeps the oceans liquid and prevents them from freezing solid from the bottom up.
If we were to illuminate them only with light from the balmer transition considered above, would the solar panels produce a current?
If we were to illuminate them only with light from the balmer transition considered above, the solar panels would not produce current.
What are solar panels?Solar panels are used to produce energy according to the principle of the photoelectric effect. When the solar panel is hit with light in the balmer series, the light is reflect hence no current is produced.
Therefore, If we were to illuminate them only with light from the balmer transition considered above, the solar panels would not produce current.
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What is thermodynamics?
o a. the movement of particles
o b. the flow of fluids
o c. the movement of matter
o d. the flow of energy, heat, and work
write down what should be considered when writting scientific notation
Answer:
Find the original location of the decimal.
Determine if the number will be positive or negative.
Move the decimal point until it creates a number between one and ten.
Count how many times you moved the decimal.
Explanation:
3d2
You have been asked to find out the best material for insulating a hot water tank.
You have three materials: aluminium foil, cotton wool and expanded polystyrene.
Describe an experiment to compare the effectiveness of these materials.
Include in your description the way you would use your results to decide the most
effective material.
The most effective insulating material is polystyrene.
What is insulating material?The material which isolates the body and doesn't allow heat and mass to flow out of the control system.
The insulating material should have the lowest thermal conductivity.
Polystyrene foam has low thermal conductivity which makes it a great insulator to heat.
Aluminum foil can be an effective insulating material because it doesn't flow heat out into the environment.
Cotton wool is effective, but not it is not fire resistant.
Thus, the best effective insulating material is polystyrene.
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A charge Q acts on a test charge to create an electric field, E. The strength of the field is measured at 8 N/C at 40 cm away. What would the field strength be 80 cm away with a charge of 1/2 Q? Explain.
The electric field strength created by a charge decreases with increasing distance from the charge. The relationship between the electric field strength (E) and the distance (r) from the charge is given by the inverse square law:
E ∝ 1/r^2
Let's consider the given scenario:
At a distance of 40 cm (0.4 m) from the charge, the electric field strength is measured as 8 N/C.
We want to determine the electric field strength at a distance of 80 cm (0.8 m) from the charge when the charge is reduced to 1/2 Q.
First, we can set up a proportionality based on the inverse square law:
(E1)/(E2) = (r2^2)/(r1^2)
Substituting the given values:
8/E2 = (0.8^2)/(0.4^2)
Simplifying the equation:
E2 = 8 * (0.4^2)/(0.8^2)
E2 = 8 * 0.16/0.64
E2 = 2 N/C
Therefore, at a distance of 80 cm from the charge, when the charge is reduced to 1/2 Q, the electric field strength would be 2 N/C.
The strength of an electric field depends on the magnitude of the charge creating the field and the distance from the charge. In this case, since the charge is reduced to 1/2 Q, the electric field strength is also halved.
Additionally, as we move twice as far away from the charge (from 40 cm to 80 cm), the electric field strength decreases according to the inverse square law. As a result, the electric field strength is reduced to 2 N/C at a distance of 80 cm.
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explain pleease :( itsreally hard
Answer:
0.5V
Explanation:
The formula for the potential difference is V=W/Q where W is the work and Q is the charge.
10/5 = 0.5
Hope this helped!
The dark fringe for m = 0 in a young's double-slit experiment is located at an angle of θ = 15°. What is the angle that locates the dark fringe for m = 1?
Answer:
51°
Explanation:
dark fringe equation = dsinθ = (m + 1/2)λ
sinθ = [(m + 1/2)λ]d
sinθ1 = [(m + 1/2)λ]d
sinθ1/sinθ = [(m + 1/2)(λ/d)] / [[(m + 1/2)(λ/d)] = [(m + 1/2)] / [(m + 1/2)]
sinθ1 = [(m + 1/2)] / [(m + 1/2)] (sinθ)
sinθ1 = [1+1/2]/[0+1/2] (sin15)
sinθ1 = 3sin15
sinθ1 = 0.77645
θ1 = sin^-1( 0.77645)
θ1 = 50.94° = 51°
The dark fringe for m = 0 in a young's double-slit experiment is located at an angle. The angle that locates the dark fringe for m = 1 is 51°.
What is dark fringe?When light passes through a slit , it produces a spectrum which can be seen on the screen kept a distance in form of fringes of different intensity. The fringe with intensity zero is called the dark fringe.
Given is the angle θ = 15°
The equation for the dark fringe is
d sinθ = (m + 1/2)λ
For m= 0 and m=1, the ratio of the sines is
sinθ₁/sinθ₀ = [(m + 1/2)] / [(m + 1/2)]
Rearranging for sinθ₁, we have
sinθ₁ = [(m + 1/2)] / [(m + 1/2)] (sinθ₀)
Substituting the values into the equation and solving for θ₁
sinθ₁ = [1+1/2]/[0+1/2] (sin15)
θ₁ = 51°
Thus, the angle that locates the dark fringe fro m = 1 is 51°.
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electricity is the flow of
Answer:
a. electrons
Explanation:
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Which list below contains only ionic compounds?
The _____ of an object consists of its speed and direction.
Answer:
The answer is velocity.
Explanation:
Velocity in physics is defined as a vector measurement of the direction and rate of the motion.(figure 1)shows the wave function of an electron in a rigid box. The electron energy is 14. 5 ev. You may want to review (page 1151)
The energy of an electron in a rigid box when it is in the next higher state is 19.6 eV
What is electron energy?The energy carried by the electron when jumping from one energy level to another is called as electron energy.
Energy in the nth level for a rigid box of length L and mass of electron m is represented as
[tex]E_{n} = \dfrac{n^2{h^{2} } }{8mL^{2} }[/tex]
As the energy is proportional to n².
[tex]\dfrac{E_{n+1} }{E_{n} } =(\dfrac{n+1}{n} )^{2}[/tex]
Substitute the value 3 for n in the above equation. So, we have the energy of an electron is
E₄ = 19.6 eV
Thus, energy of electron in a rigid box when it is in the next higher state is 19.6 eV.
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7. Identify the substance if a 5g sample is found to have a volume of 2.5ml.
Substance Density (g/mL)
A. 12.5
B. 2.0
C. 0.50
D. 10
Answer:
B
Explanation:
Density ( as shown) = g/ml
density = 5 g / 2.5 ml = 2 g/ml
When electrons are accelerated by 2450v in an electron microscope they will have wavelengths of
a)8.113nm
b)0.622nm
c)0.811nm
Mountain ranges often appear on the edges of continents. What theory does this support?
Mountains were formed when Earth’s crust cooled and Earth shrank.
right answer Mountain ranges were formed when continents collided.
Mountain ranges did not exist millions of years ago.
Mountain ranges were formed only by glaciers.
Answer:
Option 2
Explanation:
The theory supported by the statement : "Mountain ranges often appear on the edges of continents.", is that :
Mountain ranges were formed when continents collided.Answer: b. Mountain ranges were formed when continents collided.
Explanation:
