kepler's first law states that a planet moves around the sun in a(n) group of answer choices circle, with the sun at the center. elliptical orbit, with the sun at one focus. elliptical orbit, with the sun on the minor axis of the ellipse. elliptical orbit, with the sun at the center of the ellipse.
Answers
Kepler's first law states that a planet moves around the sun in an elliptical orbit, with the sun at one focus.
What are planets?Planets are large bodies in space which orbit round a star such as the Sun.
The Sun and the planets that orbit around it form the solar system.
The movement of the planets around the Sun is described as planetary motion.
Planetary motion is descried in Kepler's laws of Planetary motion.
The Kepler's laws of Planetary motion are given as follows:
every planet's orbit is an ellipse with the Sun at one focus.a line joining the Sun and a planet sweeps out equal areas in equal timesThe square of a planet's orbital period is proportional to the cube of the length of the semi-major axis of its orbit.In conclusion, planets orbit around a star.
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Related Questions
Punnett squares are used by geneticists to determine the probability of
different offspring genotypes.
Answers
Answer:
are used by geneticists to determine the probability of different offspring genotypes.
Electric Resistance measured in?
Answers
Answer:
ohms
Explanation:
because it deal with circuit
Electric resistance is measured in Ohms.
What is an Electric resistance?A electric resistance can be defined as the opposition to current flow in a conductor.
From ohms law, an electric resistance can be determined using the formula below.
Formula:
V = IR.............. Equation 1Where:
V = VoltageI = CurrentR = Electric resistanceAlso,
V is measured in VoltsI is measured in AmpereR is measured in Ohms.Hence, Electric resistance is measured in Ohms.
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Units of Planck's constant are {{c1::J s}}
Answers
The units of Planck's constant are Joule seconds (J*s).
Planck's constant is a fundamental physical constant that plays a crucial role in quantum mechanics. It relates the energy of a photon to its frequency through the equation E = hf, where E is the energy, h is Planck's constant, and f is the frequency. The unit of energy is Joules (J), and the unit of frequency is Hertz (Hz), so the unit of Planck's constant is J*s.
The significance of Planck's constant lies in its ability to bridge the gap between classical physics and quantum mechanics. It helps explain phenomena such as wave-particle duality, where particles can behave as waves and vice versa. Additionally, it is used in calculations related to atomic and subatomic particles, including the energy levels of electrons in atoms and the behavior of photons in lasers.
Overall, the units of Planck's constant demonstrate its importance as a fundamental constant in the field of quantum mechanics and its role in bridging the gap between classical physics and the mysterious realm of the subatomic world.
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who has a iphone (age range 15-19 )
Answers
Hi friend! I have an iPhone. why do you ask????
Help pls .. Which image shows an example of the weak nuclear force in action?
Answers
The third image represents the weak nuclear force in action, therefore the correct answer is option C.
What is a nuclear power plant?It is a particular kind of power plant where electricity is produced using a nuclear reactor that may use nuclear fusion or nuclear fission.
There are four fundamental forces of nature, gravitational force, electromagnetic force, strong nuclear force, and weak nuclear force.
There are two types of nuclear forces the third image represents the weak nuclear force.
The third image represents the weak nuclear force in action, therefore the correct answer is option C.
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the electric field between two charged parallel plates separated by a distance of 1.8 cm has a uniform value of 2.4 x 104 n/c. find the potential difference between the plates. how much kinetic energy would be gained by a deuteron in accelerating from the positive plate to the negative plate? (a deuteron is a particle with one proton and one neutron.)
Answers
The electric field is radially outwards from positive charge and radially in towards negative point charge.
What is an electric field, exactly?Any sort of charge causes an electric field to be associated to a location in space. The strength and direction of the electric field are expressed by the value of E, also referred to as the electric field strength, electric field intensity, or simply the electric field. The SI unit for the electrical field is volts per meter (V/m). This unit is equivalent to the Newtons per coulomb. Both Newton, which represents for force, and Coulomb, which stands for charge, are the ancestors of these units. These two are sometimes referred to as the sources of the field since they produce the magnetic field with moving charges (currents) and the electric field with stationary charges, respectively.
AV = EAX = (2.4*10N.X0.018) V/M
off = 432
N2V jk N.mm
1/2=12
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Which of the following explanations best describes how the chemical energy stored in the log compares to the heat and light energy produced by burning?
Answers
Answer:
This question is incomplete, as it lacks options. The options are:
A. chemical energy is the same and additional energy is produced as heat and light.
B. chemical energy is more than the amount of heat and light
C. the amount of chemical energy is less than the amount of heat and light energy
D. the amount of chemical energy equals the amount of heat and light energy.
The answer is D
Explanation:
According to the first law of thermodynamics, which is the LAW OF CONSERVATION OF ENERGY, energy is neither created nor destroyed but can only be changed from one form to another. This law states that no energy in a system is lost, hence, the input energy must be equal to the output energy.
When a log of wood is burnt, the chemical energy stored in it is converted to heat energy and light energy. Based on the law of conservation of energy, the amount of chemical energy present in the log before the burning process must equal the amount of light and heat energy it changed to after the burning process.
That is, chemical energy = light energy + heat energy.
The first step in the problem solving process is to: A. brainstorm solutions to the problem B. generate and research ideas C. make a model or prototype D. identify the problem.
Answers
id say the answer is D. identify the problem
the first step is to identify and understand the problem at hand. this just makes it easier to find solutions.
the first step in the problem solving process is to identify the problem this is the case. Identifying the problem is a considered the first step in the problem solving process because it lays the foundation for the rest of steps Without a clear understanding of the problem.
it is difficult to come up with effective solutions. Brainstorming solutions or generating ideas without a clear problem definition may lead to wasted time and resources. Additionally, making a model or prototype and researching ideas are steps that come later in the process and are dependent on a clear problem statement identifying the problem is crucial in order to have a successful problem solving process. Once the problem is identified, then brainstorming solutions, generating ideas, making a model or prototype, and researching ideas can be used to effectively solve the problem.
The initial step in any problem-solving process is to identify the problem. It's crucial to recognize and clearly define the issue before moving on to other steps like brainstorming solutions, generating and researching ideas, or making a model or prototype. Identifying the problem is the first step because it sets the foundation for the rest of the process. Once the problem is identified, it becomes easier to brainstorm solutions (A), generate and research ideas (B), and make a model or prototype (C) that can help address the problem. Without a clear understanding of the problem, it would be challenging to develop effective solutions.
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The mass of a carbon atom is 12. 00amu while the mass of a helium-4 atom is 4. 003amu. If three atoms of helium fuse to form carbon, how much mass is converted into energy?.
Answers
If three atoms of helium fuse to form carbon than 0.009 u of mass is converted into energy
Given: m(He) = 4.003 u
and m(C) = 12.000 u
Mass of 3 alpha particles =3×4.003 u
=12.009 u.
Mass of 1 carbon atom=12.000 u
Mass Defect =△m=12.009−12.000=0.009 u
Energy released =0.009×931.5=8.3835 MeV.
So, 0.009 u of mass is converted into 8.38 Mev energy.
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You stand on a merry-go-round which is spinning at f = 0:25 revolutions per second. You are R = 200 cm from the center. (a) Find the angular speed ! At which it is spinning. (b) Find the centripetal acceleration, ac with which it is spinning. (c) What is the minimum coefficient of static friction is between your shoes and the floor that will keep you from slipping off?
Answers
Answer:
(a) ω = 1.57 rad/s
(b) ac = 4.92 m/s²
(c) μs = 0.5
Explanation:
(a)
The angular speed of the merry go-round can be found as follows:
ω = 2πf
where,
ω = angular speed = ?
f = frequency = 0.25 rev/s
Therefore,
ω = (2π)(0.25 rev/s)
ω = 1.57 rad/s
(b)
The centripetal acceleration can be found as:
ac = v²/R
but,
v = Rω
Therefore,
ac = (Rω)²/R
ac = Rω²
therefore,
ac = (2 m)(1.57 rad/s)²
ac = 4.92 m/s²
(c)
In order to avoid slipping the centripetal force must not exceed the frictional force between shoes and floor:
Centripetal Force = Frictional Force
m*ac = μs*R = μs*W
m*ac = μs*mg
ac = μs*g
μs = ac/g
μs = (4.92 m/s²)/(9.8 m/s²)
μs = 0.5
The velocity function is v(t) = −t2 +3t −2 for a
particle moving along a line. Find the displacement and the distance
traveled by the particle during the time interval [-3,6].
displacement = ?
distance traveled = ?
Answers
The displacement of the particle during the time interval [-3,6] is -54.5 units, and the distance traveled by the particle during the same time interval is 54.5 units.
To find the displacement of the particle during the time interval [-3,6], we need to integrate the velocity function with respect to time. The antiderivative of v(t) is s(t) = \(-1/3t^3 + 3/2t^2 - 2t + C,\) where C is the constant of integration. To find C, we can use the initial condition s(-3) = 0, which gives us C = 10.
Therefore, the displacement of the particle during the time interval [-3,6] is s(6) - s(-3) = -54.5 units.
To find the distance traveled by the particle during the time interval [-3,6], we need to take the absolute value of the displacement, as the distance is always positive. Therefore, the distance traveled by the particle during the time interval [-3,6] is 54.5 units.
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A water storage tower is filled with freshwater to a depth of 6.4 m. What is the pressure at (a) 4.5 m and (b) 5.5 m below the surface of the water? (c) Why are the metal bands on such towers more closely spaced near the base of the tower?
Answers
a) The pressure at 4.5 m below the surface is 19620 Pa.
(b) The pressure at 5.5 m below the surface is 9810 Pa.
c) The closer spacing of the bands near the base ensures that the tower is strong enough to withstand the higher pressure.
The pressure at a certain depth in a liquid depends on the density of the liquid and the depth. The pressure at a point below the surface of a liquid can be found using the equation:
P = ρgh
where P is the pressure, ρ is the density of the liquid, g is the acceleration due to gravity, and h is the depth.
(a) The pressure at 4.5 m below the surface can be calculated as follows:
P = ρgh
P = (1000 kg/m³) × (9.81 m/s²) × (6.4 m - 4.5 m)
P = 19620 Pa
Therefore, the pressure at 4.5 m below the surface is 19620 Pa.
(b) The pressure at 5.5 m below the surface can be calculated as follows:
P = ρgh
P = (1000 kg/m³) × (9.81 m/s²) × (6.4 m - 5.5 m)
P = 9810 Pa
Therefore, the pressure at 5.5 m below the surface is 9810 Pa.
(c) The metal bands on the water storage tower are more closely spaced near the base of the tower because the pressure at the base is higher than at the top. The bands provide additional support to the tower, preventing it from collapsing due to the higher pressure at the base. The closer spacing of the bands near the base ensures that the tower is strong enough to withstand the higher pressure.
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Explain how ozone is both beneficial and detrimental to human health.
Answers
The ozone layer is beneficial because it protects us from the ultraviolet (UV) rays from the sun. Without it, survival would be difficult. It is harmful by containing all the pollution and chemicals . That damages our lungs and causes chest pain, coughing,etc.
Why are bubbles round?
(A serious physics question)
Answers
Answer:
The Science of Round Bubbles
But once a bubble is sealed and removed from the wand, the tension in the bubble shrinks it to the smallest possible shape for the volume of air inside of it. That's a sphere, which is the familiar round shape we see when bubbles float through the air.
Explanation:
as temperature decreases, the frequency at which a hot body emits the maximum amount of energy increases. please select the best answer from the choices provided t f
Answers
False (F)
The statement "as temperature decreases, the frequency at which a hot body emits the maximum amount of energy increases" is incorrect. In reality, as temperature decreases, the frequency at which a hot body emits the maximum amount of energy decreases. This relationship is described by Wien's displacement law, which states that the peak wavelength of radiation emitted by a black body is inversely proportional to its temperature.
According to the law, as the temperature of a hot body decreases, the peak wavelength of its emitted radiation shifts to longer wavelengths, which corresponds to lower frequencies. This means that the hot body emits more energy at lower frequencies as the temperature decreases.
As temperature increases, the hot body emits radiation at higher frequencies, which correspond to shorter wavelengths. At higher temperatures, the peak of the radiation spectrum shifts to shorter wavelengths, indicating that the hot body emits more energy at higher frequencies.
Therefore, the correct answer to the question is False (F), as the statement does not accurately reflect the relationship between temperature and the frequency of maximum energy emission.
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Which is the equivalent of 2000 mm?
a. 200 m b. 2 m c. 0.002 m d. 0.02 m
Answers
2000 mm is equivalent to 2 m. This can be derived from the fact that 1 m = 1000 mm. Thus, 2000 mm would be equal to 2 m since it is twice the length of 1000 mm. This conversion is important in various fields such as construction, engineering, and science where precision is necessary.
It is crucial to be able to convert between different units of measurement in order to make accurate calculations and measurements.The millimeter is a unit of length that is often used to measure small distances such as the thickness of a sheet of paper or the size of a small component. It is part of the metric system, which is a system of units used across the world that is based on multiples of 10.
This system makes it easy to convert between different units since it is based on a consistent set of rules.For example, to convert 2000 mm to meters, we can simply divide by 1000 since there are 1000 millimeters in a meter. This gives us 2 meters, which is the equivalent length in meters of 2000 millimeters.
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the intensity of the incoming sunlight is 1050 w/m2 . what is the power of the light captured by the lens?
Answers
The power of the light captured by the lens is 84 watts.
To calculate the power of the light captured by the lens, we need to know the area of the lens and the efficiency of the lens. Let's assume the lens has an area of 0.1 m2 and an efficiency of 80%.
First, we need to convert the intensity of the incoming sunlight from watts per square meter (W/m2) to watts (W) by multiplying it by the area of the lens:
1050 W/m2 x 0.1 m2 = 105 W
Next, we need to take into account the efficiency of the lens:
105 W x 0.8 = 84 W
So the power of the light captured by the lens is 84 watts.
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An object moving with uniform acceleration has displacement of 25 metre is 5 seconds and 36 metres in 6 seconds . calculate the initial velocity and acceleration
Answers
The initial velocity (a) is 0 m/s and the acceleration (b) is 2 m/s².
The BreakdownLet's represents the initial velocity as "a" and the acceleration as "b."
Given information:
Displacement (s₁) in 5 seconds = 25 meters
Displacement (s₂) in 6 seconds = 36 meters
We can use the following equation to find the initial velocity (a):
s = at + (1/2)bt²
For the first case:
25 = b × 5 + (1/2) × b × (5²)
For the second case:
36 = a × 6 + (1/2) × b × (6²)
Since we have two equations, we are going to solve them simultaneously.
Multiplying the first equation by 2:
50 = 10a + 25b ---> (equation 1)
Multiplying the second equation by 2:
72 = 12a+ 36b ---> (equation 2)
Subtracting equation 1 from equation 2:
72 - 50 = 12a - 10a + 36b - 25b
22 = 2a+ 11b ---> (equation 3)
We now have a simplified equation 3. Let's solve equation 3 for a:
2a = 22 - 11b
a = (22 - 11b) / 2
substitute the value of u into equation 1:
50 = 10 × ((22 - 11b) / 2) + 25b
Simplifying the equation:
50 = 5(22 - 11b) + 25b
50 = 110 - 55b + 25b
50 = 110 - 30b
Rearranging the equation:
30b = 110 - 50
30b = 60
b = 60 / 30
b = 2 m/s²
Now that we have the value of acceleration (b), we can substitute it back into equation 3 to find the initial velocity (a):
a = (22 - 11b) / 2
a = (22 - 11(2)) / 2
a = (22 - 22) / 2
a = 0 / 2
a = 0 m/s
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43.5 kg. Shawn rides his bike 1.3 km in
10.4 min at a constant velocity.
The acceleration of gravity is 9.8 m/s^2.
What is Shawn’s kinetic energy?
Answer in units of J.
Answers
Answer:
K.E is 90.625 J
Explanation:
Data:
Mass = m = 43.5kg
Distance = d = 1.3km = 1300 m
Time = t = 10.4 min = 624 sec
Accelaration = a or g = 9.8
Formula for kinrtic energy
K.E = 1/2mv²
Find velocity
V = d/t = 1300/624 = 2.0833333333333 m/s
Put values in formula
K.E = 1/2 (43.5)(2.084)² = 90.624999999995
Mark brainliest if you understand it
Global climate and weather patterns are driven by differences in the amount of heat energy in different areas of the Earth. Which statement best explains why different areas of the Earth have different amounts of heat energy?
The Earth receives different amounts of solar energy in different regions.
ocean currents and global wind patterns, which are caused by convection currents, most strongly affect a region's
climate
An area with an average annual temperature of more than 64°F and greater than 59 inches of annual rainfall would be an example of which type of climate?
tropical
Which of the following factors would affect the weather patterns of a region?
all of these
Water cycles from the atmosphere into the hydrosphere through precipitation. Water cycles from the hydrosphere back to the atmosphere through evaporation.
Which of the following is one way that these patterns can effect climate?
Areas located near a large body of water typically receive more precipitation than areas that are not located near water.
Convection currents, which affect weather and climate, are created by
the uneven heating of the Earth.
Which of the following statements best describes global temperature patterns?
The temperature of a specific region tends to change in fairly predictable patterns throughout a day and during the course of a year.
Seasonal changes in water temperature tend to remain within a narrow range. This is opposed to air temperature, which tends to fluctuate across a wide range. The relative stability of ocean temperatures helps to regulate the temperatures of coastal regions. Why can water remain within a narrow range of temperatures?
It has a high heat capacity.
The Sun's energy is critical to the Earth's climate and weather patterns because it drives the water cycle. Which stage of the water cycle is the Sun's energy most critical to?
evaporation
he polar climate zone is the coldest of the three zones. Why is this?
The polar climate zone is located between about 67°N latitude and the North Pole—this latitude zone receives less sunlight than the other two latitude zones.
Weather is a condition of the atmosphere at a particular time and place. Wind, rain, and cloud formations are all forms of weather phenomena. What is the primary source of energy for weather phenomena?
solar radiation
The equator tends to contain regions with hot climates. However, the Rwenzori Mountains, which are located close to the equator, are covered in ice caps. Why is the climate of the Rwenzori Mountains not hot?
Temperatures decrease with elevation
A number of factors work together to create climate. What are the two main factors to consider in determining the climate of an area?
temperature and precipitation
Answers
The best statement that explains why different areas of the Earth have different amounts of heat energy is that "Earth receives different amount of solar energy in different regions " .
In the question ,
it is given that ,
Global climate & weather patterns are driven by differences in amount of heat energy in different areas of Earth .
we have to find the true statement for the given cause .
we know that ;
Different parts in the Earth surface receive different amounts of sunlight . The Sun rays strike the Earth surface most directly at Equator.
that means Near the poles, the Sun rays strike surface at a slant due to which the rays spread over wide area.
The more focused rays are, more energy the area receives, and it will be more warmer .
Therefore , the correct statement to explain given reason is "Earth receives different amount of solar energy in different regions " .
The given question is incomplete , the complete question is
Global climate and weather patterns are driven by differences in the amount of heat energy in different areas of the Earth. Which statement best explains why different areas of the Earth have different amounts of heat energy ?
(a) The solar radiation from the Sun is equally distributed across the Earth at all times.
(b) The gravitational energy from the Sun varies greatly in different regions of the Earth.
(c) The Earth spins at different rates so the rotational energy of the Earth varies.
(d) The Earth receives different amounts of solar energy in different regions
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Mention four ways in which the rule of law could proctect community members whose private property was damaged during a protest action
Answers
The rule of law is critical in protecting community members and their property during protests or other civil unrest, ensuring that those who commit illegal acts are held accountable and that justice is served.
Here are four ways that the rule of law could protect community members whose private property was damaged during a protest:
Criminal prosecution: The rule of law requires that those who commit criminal acts, such as damaging private property, be held accountable for their actions. Community members could report the damage to authorities, who could then investigate the incident and pursue criminal charges against those responsible.Civil litigation: The rule of law also provides for civil remedies, such as suing the individuals or groups responsible for the damage. Community members may file a lawsuit to seek compensation for property damage.Police protection: The rule of law requires law enforcement agencies to protect citizens and their property. Residents may request police protection to prevent further damage to their property during future protests.Injunctions: The rule of law allows for injunctions to prevent individuals or groups from engaging in certain activities, such as damaging private property. Residents may seek an injunction to prevent future damage to their property during protests.Learn more about civil here:
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HELP PLZ !!!
This graph relationship shows the dependent variable increasing at a greater rate than the independent variable.
A. Quadratic
B.Inverse
C. Linear/direct
D. No Relationship
Answers
Answer:
probly c or b
Explanation: experinse
What is meant by the term 'total internal reflection'? (GCSE Level)
Answers
Explanation:
Total Internal Reflection (TIR) is a phenomenon in optics, by which light experiences complete reflection at an interface between two media.
In the figure i > © experience total internal reflection
If a Ferrari, with an initial velocity of 10 m/s, accelerates at a rate of 50 m/s2 for 3
seconds, what will its final velocity be?
Answers
Answer:
we know that
a (acceleration)= {v (final velocity)-u (initial velocity) } / t (time)
so if we have to find v, so it will be:
at/u=v
so 50 * 10= 500
divided by 3s
so the answer is 166.67 m/s.
A 19.7 kg sled is pulled with a 42.0 N force at a 43.0° angle, across ground where μ₁ = 0.130.
What is the normal force on the sled?
Answers
The following information is provided in the problem: A sled with a weight of 19.7 kg is pulled with a force of 42.0 N at an angle of 43.0° across ground where μ₁ = 0.130. We need to find out the normal force that is exerted on the sled.
Let us examine each of the forces acting on the sled.The weight of the sled is equal to its mass multiplied by the acceleration due to gravity. Therefore, the weight of the sled is:mg = 19.7 kg x 9.8 m/s² = 193.06 N.The force exerted on the sled can be divided into two components: one that is parallel to the ground and one that is perpendicular to the ground.The force parallel to the ground is:F₁ = 42.0 N x cos(43.0°) = 30.56 N.The force perpendicular to the ground is:F₂ = 42.0 N x sin(43.0°) = 28.30 N.The frictional force is equal to the coefficient of friction multiplied by the normal force. Therefore, we need to find the normal force on the sled in order to calculate the frictional force. Since the sled is not accelerating vertically, the normal force is equal to the weight of the sled plus the force perpendicular to the ground. Therefore, N = mg + F₂N = 193.06 N + 28.30 N = 221.36 N.The frictional force is:Fr = μ₁ x NFr = 0.130 x 221.36 N = 28.77 N.Thus, the normal force exerted on the sled is 221.36 N.For such more question on perpendicular
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What pigments would be present in an object that appears red?
Answers
Anthocyanins would be present in an object that appears red
What is a pigment?This is the term that is used to refer to the natural or the synthetic, substance that is known to give color to other materials or surfaces.
They are very useful in art as well as in cosmetics to create specific colors and effects.
Dyes, liquids and pastes are known to contain pigments in them. They are derived from plants or from animals of mineral sources
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What is the power of 10 when 0.00503 is written in scientific notation?
Answers
Answer:
Negative 3
Explanation:
Bc scientific notation is the zeros either ahead or behind the actual numbers
Answer:
-3
Explanation:
you have been hired to design a spring-launched roller coaster that will carry two passengers per car. the car goes up a 10-m -high hill, then descends 15 m to the track's lowest point. you've determined that the spring can be compressed a maximum of 2.2 m and that a loaded car will have a maximum mass of 440 kg . for safety reasons, the spring constant should be 11 % larger than the minimum needed for the car to just make it over the top.
Answers
In order to design a spring-launched roller coaster that will carry two passengers per car, a spring constant of approximately 4255.78 N/m is needed for the roller coaster to be safe.
Several factors must be taken into consideration. The car must go up a 10-m-high hill and then descend 15 m to the track's lowest point. The maximum amount the spring can be compressed is 2.2 m, and a loaded car will have a maximum mass of 440 kg. Additionally, for safety reasons, the spring constant should be 11% larger than the minimum needed for the car to just make it over the top.
To determine the spring constant needed for the roller coaster, we can use the following formula:
U = (1/2)kx²where U is the potential energy of the spring, k is the spring constant, and x is the distance the spring is compressed. To find the minimum spring constant needed for the car to just make it over the top of the hill, we can set the potential energy of the spring equal to the potential energy of the car at the top of the hill:
U = mgh, where m is the mass of the car, g is the acceleration due to gravity, and h is the height of the hill.
U = (1/2)kx²mgh
= (1/2)kx²k = 2mgh/x²
Plugging in the given values, we get: k = 2(440 kg)(9.81 m/s²)(10 m)/(2.2 m)²k ≈ 3831.64 N/m. To find the spring constant needed for safety reasons, we can multiply the minimum spring constant by 1.11:k' = 1.11k' ≈ 4255.78 N/m
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How much work do you need to do if you use a force of 3 Newtons to move a table 25 meters?
75 meters per second squared
0.12 Joules
0.12 N-m
75 N-m
Answers
The work needed if a force of 3N is used to move a table 25 metres is 75Nm (joules).
How to calculate work done?Work is a measure of energy expended in moving an object. This means that no work is done if the object does not move.
Force is a physical quantity that denotes the ability to push, pull, twist or accelerate a body and which has a direction and is measured in Newtons.
Work done on an object can be calculated by multiplying the force applied to move the object by the distance the object moves as follows:
Work done = Force (N) × distance (m)
According to this question, a force of 3 Newtons is used to move a table over a distance of 25 meters. The work done on the table can be calculated as follows;
W = 3N × 25metres
W = 75Nm
Therefore, 75Nm is the work done on the table.
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Which one of the following is an accurate statement about light?
a) When light strikes a surface at Brewster's angle, only the reflected light is 100% polarized.
b) When light strikes a surface at Brewster's angle, the reflected and transmitted light are both 100% polarized.
c) When light strikes a surface at the critical angle, all the light passes through the surface.
d) When light strikes a surface at Brewster's angle, it is completely reflected at the surface.
e) When light strikes a surface at the critical angle, only the reflected light is 100% polarized.
Answers
The accurate statement about light is: a) When light strikes a surface at Brewster's angle, only the reflected light is 100% polarized.
Your question is about which statement about light is accurate, including the terms "accurate", "light", and "Brewster's angle". The correct answer is:
a) When light strikes a surface at Brewster's angle, only the reflected light is 100% polarized.
Brewster's angle is the angle of incidence at which light, when striking a surface, is completely polarized in the reflected light. At this angle, the reflected light is polarized perpendicular to the plane of incidence, while the transmitted light is not polarized. This is because, at Brewster's angle, the reflected light is polarized parallel to the surface, while the transmitted light is not completely polarized.
Therefore, option a) correctly states that only the reflected light is 100% polarized at Brewster's angle.
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