It is false that the vector u results when a vector u-v is added to the vector v.
The basic definition of the vector it that it is any physical quantity that has a magnitude as well as direction and it follows vector laws of addition. i.e. Parallelogram law of vector addition or triangle law of vector addition.
Now, it is stated that the vector u results when a vector u-v is added to the vector v, this statement may or may not be true because we cannot be certain about it. Because we do not know the direction of the two vectors u and v. This is why we conclude that the statement is false.
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I really need the answers now……
A spanner 15 cm long is used to tighten a nut which is pushing against a spring. The spring is exerting a force of 1,000N on the nut, and the screw is 30% efficient, with a pitch of 0.1 cm. What force is being exerted on the end of spanner?
Answer:
Approximately 500,000 N.
Explanation:
We can start by using the equation for the efficiency of a screw:
efficiency = load / effort
where load is the force being exerted on the nut by the spring, and effort is the force being exerted on the end of the spanner. Solving for effort, we get:
effort = load / efficiency
Substituting the given values, we get:
effort = 1000 N / 0.3 = 3333.33 N
Next, we can use the equation for the mechanical advantage of a screw:
mechanical advantage = length of effort arm / pitch
where the length of the effort arm is the length of the spanner, and the pitch is the distance traveled by the screw for one complete turn. Substituting the given values, we get:
mechanical advantage = 15 cm / 0.1 cm = 150
Finally, we can use the formula for the relationship between force, effort, and mechanical advantage:
force = effort × mechanical advantage
Substituting the values we found, we get:
force = 3333.33 N × 150 = 499999.5 N
Therefore, the force being exerted on the end of the spanner is approximately 500,000 N.
Calculate the potential energy of a 93 kg person standing on a bridge 4.2 meters off the
ground.
Answer:
3906J
Explanation:
m=93 h=4.2 g=10
PE=m×g×h
= 93 ×10 ×4.2
=3906J
for object 1 to have a higher absolute temperature than object 2, object 1 must have a —
"For object 1 to have a higher absolute temperature than object 2, object 1 must have a higher average internal kinetic energy."
The temperature of an item on a scale where 0 is assumed to be absolute zero is known as its absolute temperature, also known as thermodynamic temperature. The Kelvin and Rankine gauges measure absolute temperature. The temperature at which a machine has the least amount of energy is called absolute zero.
These molecules and atoms move more rapidly when something is heated, providing it with more thermal energy. Compared to frigid water, hot water has more thermal energy. Molecules and atoms in colder things move more slowly and have less thermal energy than those in warmer ones.
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Of the following, which color represents the lowest surface temperature for a star?a. Yellow.b. Blue.c. Orange.d. Red.e. White.
Answer:
Option.D Red
Explanation:
Red stars usually have the lowest surface temperature.
when charged particles move through a conductor such as copper wire, what moves?
When charged particles move through a conductor such as copper wire, the electric charge moves. Specifically, the negatively charged electrons in the wire move in response to the electric field produced by the battery or other source of electrical energy.
As the electrons move, they collide with other atoms and transfer energy, causing a flow of charge through the wire. This flow of charge is called an electric current and is measured in amperes (A). In a direct current (DC) circuit, the electrons flow in one direction, while in an alternating current (AC) circuit, the electrons change direction periodically, producing a fluctuating current.
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in one to two sentences, explain how the shorelines can affect weather
because the ocean releases heat more slowly than land, coastal areas tend to be more temperate. Upwelling in many coastal regions provides a cool contrast in air temperature over the ocean and land that is conducive to frequent summer fog.
Occasionally when walking across carpet in socks your socks seem to collect
"static.
This static build up really occurs when charges from the carpet are transterred to your socks by friction). What would the approximate order of magnitude be of the amount of charge collected by your socks in such a
situation?
A. 103 c
B. 1.0 C
C 10-3 c
D 10-8 с
E 10-12 ~
The approximate order of magnitude of the amount of charge collected by socks when walking across carpet in socks would be in the range of 10^-8 C (Option D) to 10^-12 C (Option E).
The amount of charge generated by friction between socks and carpet is typically very small, on the order of microcoulombs or even picocoulombs. This is because the charge generated by friction is proportional to the amount of surface area in contact and the strength of the electric field in the region.
Therefore, option D (10^-8 C) and option E (10^-12 C) are the most likely orders of magnitude for the amount of charge collected by socks in such a situation. Option A (10^3 C) and option B (1.0 C) are far too high, while option C (10^-3 C) is too low.
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--The complete answer is, Occasionally when walking across carpet in socks your socks seem to collect "static". This static build up really occurs when charges from the carpet are transferred to your socks by friction). What would the approximate order of magnitude be of the amount of charge collected by your socks in such a situation?
A. 10^3 C
B. 1.0 C
C 10^-3 C
D 10^-8 C
E 10^-12 C--
how many miles is 10 km
10 kilometers (km) is equal to approximately 6.2137 miles.
The mile is a unit of length commonly used in the United States, while the kilometer is the standard unit of length in the metric system used in most other parts of the world.
To convert kilometers to miles, we can use the conversion factor of 1 kilometer is equal to 0.621371192 miles. Multiplying 10 km by this conversion factor gives us the result: 10 km x 0.621371192 miles/km = 6.2137 miles
Therefore, 10 kilometers is equivalent to approximately 6.2137 miles. This conversion can be useful in a wide range of contexts, such as when traveling internationally, calculating distances for athletic events, or comparing the fuel efficiency of vehicles that use different units of measurement.
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if the wires are of negligible diameter but are 2.8 mm apart, what is the magnetic field 10.0 cm from their midpoint, in their plane
According to the statement, The magnetic field 10.0 cm from their midpoint, in their plane is 0.028.
What is a magnetic field?The region around a magnet where the effects of magnetism are perceived is known as the magnetic field. To explain how the force of magnetism is distributed in the area around and inside something magnetic in nature, we use a magnetic field as a tool.
The magnetic field produced by these two current-carrying wires is simply the sum of the magnetic fields produced b each individually. Sin ce these current are antiparallel, their magnetic field partially cancel so that
Bnet = uI/2π ( 1/r1- 1/r2) = [(4π × 10^-7 m/A)(25.0 A)]/2π
=(1/0.10m - 0.0014m) - (1/0.10 + 0.0014m)
=1.4× 10^-6
in comparison, the earth's magnetic field is 0.5 × 10^-4 T so
Bnet/Bearth = 1.4× 10^-6 T/0.5 × 10^-4 T = 0.028
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The complete question is -
A long pair of insulated wires serves to conduct 25.0A of dc current to and from an instrument.
if the wires are of negligible diameter but are 2.8 mm apart, what is the magnetic field 10.0 cm from their midpoint, in their plane
what is second law of motion
The second law of motion, also known as Newton's second law of motion, states that the acceleration of an object is directly proportional to the force applied to it and inversely proportional to its mass.
This law is expressed mathematically as:
F = ma
where F is the force applied to the object, m is the mass of the object, and a is the resulting acceleration.
In other words, the greater the force applied to an object, the greater the acceleration it will experience, and the greater the mass of the object, the smaller the resulting acceleration for a given force.
This law also implies that if two objects of different masses are acted upon by the same force, the object with the smaller mass will experience a greater acceleration.
The second law of motion is one of the fundamental laws of physics and is used to explain a wide range of phenomena, from the motion of objects on Earth to the behavior of celestial bodies in space.
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how much work must be done to stretch this spring by 0.050 m from its unstretched length?
Calculate the ratio of the drag force on a jet flying at 1000km/h at an altitude of 10 km to the drag force on a prop-driven transport flying at half that speed and altitude. The density of air is 0.38kg/m^3 at 10 km and 0.67kg/m^3 at 5.0km. Assume that the airplanes have the same effective cross-sectional area and drag coefficient C
The airplanes have the same effective cross sectional area and drag coefficient. Then, the ratio of drag force at the two densities is 2.3.
Drag Force:
Drag is a type of air resistance that resists the motion of an object moving through the air. Strength is an important consideration in engineering design. Understanding drag and how to reduce it can help people design stronger structures and bridges to better resist wind, more efficient cars and planes, and more efficient harvesting of wind and hydroelectric power. As cars, planes and ships move, drag slows them down. Therefore, engineers improved the aerodynamics of these vehicles to reduce drag and increase vehicle efficiency.
It is related to the density ρ, to the drag coefficient C, to the speed v, to the surface A as follows:
D = 1/2 ρCAv².
According to the Question:
Here, C and A are the same then the ratio of the drag forces D1 and D2 at the two densities is:
D1/D2 = ρ1 v1²/ρ2 v2²
ρ1 = 0.38 kg/m³
ρ2 = 0.67 kg/m³
v1 = 1000 km/h
v2 = 500 km/h
Then, the ratios of drag force is ;
D1/D2 = 0.38 kg/m³ × 1000 km/h / (0.67 kg/m³ × 500 km/h)
= 2.3
Therefore, the ratio of drag force at the two densities is 2.3.
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Seismic waves generated by earthquakes travel faster through the mantle than the crust. What information does that provide scientists?
Responses
The mantle is less dense than the crust.
The mantle is more dense than the crust.
The mantle is thinner than the crust.
The mantle is thicker than the crust.
Answer:
The seismic waves generated by earthquakes travel faster through the mantle than the crust, providing scientists with information about the differences in composition and density between the two layers of the Earth. The mantle is less dense than the crust, and thus it is able to transmit seismic waves more quickly than the thicker and denser crust.
what is the underlying force in all types of mass movements?
The underlying force in all types of mass movements is gravity.
Gravity is the force that attracts objects with mass towards each other. In the case of mass movements, it is the force that causes rocks, soil, snow, or other materials to move downhill or away from a slope or vertical face. This force is the result of the weight of the material acting on itself and the underlying surface, which can cause stress and deformation in the soil or rock.
The driving force for mass movements can come from different sources, including natural phenomena such as earthquakes or heavy rainfall, or human activities such as mining or construction. However, in all cases, gravity is the force that pulls the material down the slope or away from the vertical face.
The speed and magnitude of a mass movement depend on several factors, including the type and properties of the material, the steepness and shape of the slope, the water content, and the force and duration of the triggering event. Understanding the role of gravity in mass movements is crucial for predicting, preventing, and mitigating the effects of natural hazards such as landslides, rockfalls, or avalanches.
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the driver of a car traveling at 30.0 m/s applies the brakes and undergoes a constant negative acceleration of 2.00 m/s2. how many revolutions does each tire make before the car comes to a stop, assuming that the car does not skid and that the tires have radii of 0.300 m?
Each tire makes 30 revolutions before the car comes to a stop, as the distance traveled (radius * number of revolutions) is equal to the final velocity divided by the acceleration.
What is Acceleration?Acceleration is the rate of change of velocity over time. It is represented mathematically by the equation a = Δv/Δt, where a is acceleration, Δv is the change in velocity, and Δt is the change in time. Acceleration can be a change in the speed of an object, or it can be a change in the direction of its motion. Acceleration can be caused by a variety of forces, including gravity, friction, and applied forces.
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electrical conductors installed in rigid metal conduit encased in concrete are considered ? .
Electrical conductors installed in rigid metal conduit encased in concrete are considered to be accessible.
What are electrical conduits ?Enclosed conductors in electrical conduit are very well protected against impacts, moisture, and chemical vapors. Comparing the ease of design and construction to several runs of cables or the price of specialized composite wire, various numbers, sizes, and types of conductors can be pushed into a conduit.
Building wiring systems may undergo regular modifications. Electrical conduit can be used for frequent wiring upgrades because it allows for the easy removal of old conductors and the installation of new ones with little disruption along the conduit's course.
Some conduit types may be directly encased in concrete. This is frequently utilized in commercial buildings to enable the installation of electrical and communication outlets in the center of sizable open spaces. Hence, they are considered to be accessible.
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how to convert 354 f to c?
354°F = 178.89 °C.
The temperature can be converted by first multiplying 354 by 9 over 5. Then, to get 80.6 degrees Fahrenheit, multiply 354 by 48.6.
The temperature scale known as the Fahrenheit scale was derived from one that physicist Daniel Gabriel Fahrenheit suggested in 1724. The unit is the degree Fahrenheit.
On the Celsius scale, one of the two temperature scales used in the International System of Units (the other being the Kelvin scale), the unit of temperature is the degree Celsius.
Fahrenheit was an early developer of the thermometer as we know it, thus he naturally needed to mark out different temperatures on them. He created the scale that is today known as Fahrenheit.
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How much does mastering physics cost?
The cost of using Mastering Physics can vary depending on several factors, such as the institution and the specific course. The cost of these codes can range from $50 to $150 or more, depending on the length of access and the number of courses included.
Some institutions may include the cost of using Mastering Physics as part of their tuition fees. Typically, students purchase access codes that are valid for a certain period. Mastering Physics is an online platform designed to supplement physics courses for students. It provides interactive tutorials, homework assignments, and other educational resources to enhance the learning experience.
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What is 48.8 degrees Celsius in Fahrenheit?
In Fahrenheit, 48.8 degrees Celsius is equivalent to 149.04 degrees.
Use the formula below for the convert 48.8 degrees Celsius to Fahrenheit:
°F = (°C x 1.8) + 32
The process of translating a temperature from one scale to another is referred to as temperature conversion. Temperature conversions between the several regularly used temperature scales, including Celsius, Fahrenheit, and Kelvin, are frequently required.
where the temperature is expressed in degrees Fahrenheit (°F) and degrees Celsius (°C).
Plugging in 48.8 degrees Celsius yields the following results:
°F = (48.8 x 1.8) + 32
°F = 117.04 + 32
°F = 149.04
As a result, 48.8 Celsius is equivalent to 149.04 Fahrenheit.
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Transcribed Image Text:9. You are holding two balloons of the same volume. One balloon contains 1.0 g helium. The other balloon contains neon. What is the mass of neon in the balloon? mol to c O2Smol 1.010 0.20 g b. 1.0 g 4.0 g d. 5.0 g e. 20. g a. Weod 0.25mol dog I mol с. 1
The mass of Neon in the ball is 5.18 grams when two balloons of the same volume where one contains 1.0 g helium and the other with Neon.
Given the mass of helium = 1g
The molar mass of helium (He) = 4g/mol
The mass of neon = m2
The molar mass of Neon (Ne) = 20.18 g/mol
Since the volume of two balloons is same, mass of the balloons depend on their molar masses respectively.
So, 1/4 = m2/20
m2 = 5.18g
Hence the mass of Neon in the balloon would be equal to 5.18g.
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how to convert 60c to fahrenheit?
There are 140 degrees Fahrenheit in 60 degree Celsius.
For conversion of temperatures of degrees Fahrenheit to degrees Celsius, we need to multiply the result by.5556 (or 5/9) after subtracting 32 to it. While converting any value from degrees Celsius to Fahrenheit, we need to multiply the result by 1.8 (or 9/5) and then by 32.
According to question:
The Fahrenheit, Celsius, Kelvin, all these are the scales which are used to measure temperature. Celsius (°C) is a metric scale and Fahrenheit (°F) is an imperial scale. To convert a temperature from Celsius to Fahrenheit, you can use the formula:
°F = (°C × 9/5) + 32. In this case, 60°C × 9/5 = 108 and 108 + 32 = 140°F.
It's important to know both scales because they are used in different parts of the world and in different fields, such as meteorology, medicine, and cooking. Understanding how to convert between these two temperature scales is a valuable skill for anyone dealing with temperature measurements.
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True or False? instantaneous velocity can be positive, negative, or zero.
True, instantaneous velocity can be positive, negative, or zero.
What is instantaneous velocity?
Instantaneous velocity is the velocity of an object at a specific moment in time. It can be positive if the object is moving in a positive direction, negative if the object is moving in a negative direction, or zero if the object is not moving at all
Velocity is a measure of how fast an object is moving and in what direction. Instantaneous velocity, as the name suggests, refers to the velocity of an object at a specific instant in time. It is calculated by finding the derivative of the object's displacement with respect to time.
When an object is moving in a positive direction, its instantaneous velocity will be positive. For example, if a car is moving forward on a straight road, its velocity is positive. Similarly, when an object is moving in a negative direction, its instantaneous velocity will be negative. For example, if the same car is moving backward on the same road, its velocity is negative. Finally, if an object is not moving at all, its instantaneous velocity is zero.
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how will bulb a and bulb c be affected when bulb b and d are disconnected in each circuit?
The correct answer is: Bulb A will stay lit but Bulb C will turn off when Bulb D is disconnected in the circuit on the right, and both Bulb A and Bulb C will stay lit when Bulb B is disconnected in the circuit on the left.
What is a circuit?A circuit is a complete path or loop through which an electric current can flow. It consists of different components such as a power source (such as a battery), conductive wires, and other electrical components such as resistors, capacitors, and switches.
In the circuit on the left, Bulb A and Bulb B are connected in parallel while in the circuit on the right, Bulb C and Bulb D are connected in series.
When Bulb B is disconnected from the circuit on the left, Bulb A will stay lit because it is still receiving current from the battery through the unbroken wire. Bulb C will also stay lit because it is not affected by the disconnection of Bulb B.
When Bulb D is disconnected from the circuit on the right, the circuit will be incomplete because it is in series. This means that no current will flow through the circuit, and both Bulb A and Bulb C will turn off.
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what is ccl4 compound name
Tetrachloromethane is the name given to the CCl4 chemical.
Structure of carbon tetrachloride chemically. The liquid CCl4 is transparent, nonflammable, and heavy. It evaporates quickly and has a distinctive sweet smell that is similar to that of chloroform. The term "volatile organic compound" refers to CCl4 (VOC).
The secondary prefix for four carbon atoms is tetra. The first prefix for chlorine is chloro. Meth represents the word's root, which is carbon. Tetrachloromethane, which may also be written as 1,1,1,1, is the name of the substance. a week ago With the chemical formula CCl4, carbon tetrachloride is an organochlorine chemical compound that goes by several different names.
covalent substance Since it has four non-polar covalent connections between carbon and chlorine, carbon tetrachloride (CCl4) is classified as a covalent molecule.
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Calculate the ratio of the drag force on a jet flying at 1000km/h at an altitude of 10 km to the drag force on a prop-driven transport flying at half that speed and altitude. The density of of air is 0.38 kg/m3 at 10 km and 0.67 kg/m3 at 5.0 km. Assume thhat the airplanes have the same effective cross-sectional area and drag coefficient C.
The ratio of the drag force on the jet to the drag force on the prop-driven transport is approximately 3.43.
The drag force on an airplane is given by the formula,
Fd = (1/2) * rho * v^2 * A * C
where Fd is the drag force, rho is the density of air, v is the velocity of the airplane, A is the effective cross-sectional area, and C is the drag coefficient.
For the jet flying at 1000 km/h at an altitude of 10 km,
Fd_jet = (1/2) * 0.38 kg/m^3 * (1000 km/h)^2 * A * C
For the prop-driven transport flying at half the speed and altitude,
Fd_prop = (1/2) * 0.67 kg/m^3 * (500 km/h)^2 * A * C
Fd_jet/Fd_prop = [(1/2) * 0.38 kg/m^3 * (1000 km/h)^2]/[(1/2) * 0.67 kg/m^3 * (500 km/h)^2]
Simplifying this expression,
Fd_jet/Fd_prop = (0.38/0.67) * (1000/500)^2
Fd_jet/Fd_prop ≈ 3.43
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what is the term for the flow of air in a north and south direction, which is caused by a difference in solar energy between the poles and the equator
The term for the flow of air in a north and south direction, caused by a difference in solar energy between the poles and the equator, is called the "Hadley cell circulation" or simply the "Hadley circulation."
What is Hadley circulation?The Hadley circulation is a large-scale atmospheric circulation pattern that occurs in the tropics.
It is driven by the unequal heating of the Earth's surface by the Sun, which creates a temperature gradient between the equator and the poles. Warm air near the equator rises, creating a low-pressure area, and then flows poleward at high altitudes.
As the air moves away from the equator, it cools and sinks back down to the surface near the subtropical regions, creating high-pressure areas. The air then returns to the equator at the surface, completing the circulation loop.
This north-south flow of air in the Hadley circulation helps to distribute heat and moisture from the tropics toward higher latitudes, playing a significant role in shaping global weather patterns. It influences the formation of trade winds, tropical rainforests, and desert regions.
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how does the sun's diameter compared with the distance between earth and the sun
The Sun's diameter is approximately 1.39 million kilometers, while the distance between the Earth and the Sun is approximately 149.6 million kilometers. This means that the Sun's diameter is about 109 times larger than the Earth's diameter, and the distance between Earth and Sun is about 108 times the Sun's diameter.
Despite this enormous distance, the gravitational pull of the Sun on the Earth and other planets in the Solar System keeps them in their orbits, while the energy from the Sun supports life on Earth through photosynthesis and other processes.
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the si base units depend on the location where measurements are made. (true or false)
False. SI (International System of Units) base units are standardized and do not depend on the location where measurements are made.
The SI system is a globally recognised and standardised measuring system. The framework provides a standard paradigm for measuring physical quantities independent of location or circumstance. SI base units are universal measures that underpin this system.
These base units—meter, kilogramme, second, etc.—are defined globally. This standardisation promotes uniformity, accuracy, and a single language for science and technology by ensuring accurate and trustworthy scientific measurement communication across researchers, enterprises, and governments.
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mass is conserved in a reaction if the choose... of the initial reactant masses equals the choose... of the masses of choose...
Mass is conserved in a reaction if the of the initial reactant masses equals the of the masses of products
The law of conservation of mass is a fundamental principle in chemistry that states that the total mass of a closed system remains constant during a chemical reaction. This means that the mass of the reactants before a chemical reaction is equal to the mass of the products after the reaction.
The mass of the reactants before the reaction is equal to the mass of the products after the reaction. This confirms that the law of conservation of mass holds true for this chemical reaction.
This principle is essential in chemistry as it allows us to make predictions about the outcome of a reaction based on the starting materials. It also helps to ensure the accuracy of experimental measurements, as any discrepancy between the expected and observed masses can indicate an error in the experiment.
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how much work is done (in j) when a weight lifter lifts 130 kg from 1.5 m to 2.0 m above the ground? (use 9.8 m/s2 for g.)
The work done is 1,944 J, when a weight lifter lifts 130 kg from 1.5 m to 2.0 m above the ground
What does work done mean?Work done is a term used to describe the amount of effort that has been expended on a particular task or project. It can refer to the amount of time and energy that has been put into something, or the amount of progress that has been made. It can also refer to the results of that work, such as the completion of a task or the production of a product. Work done is typically measured in terms of hours worked, milestones achieved, or the amount of output produced.
when a weight lifter lifts 130 kg from 1.5 m to 2.0 m above the ground, the work done is
Work = [tex]force\times distance[/tex]
Work = [tex]mass\times gravity \times height[/tex]
Work = [tex]130 kg\times 9.8 m/s^2 \times 0.5 m[/tex]
Work = 1,944 J
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