1.20 E^6/18.5=6.48E^4
Final answer:
The latent heat of fusion is the heat required to change a substance from solid to liquid state. In this case, the latent heat of fusion is calculated for an unknown substance when 1.20 E6 Joules of heat melts 18.5 kilograms of it.
Explanation:
The latent heat of fusion of a substance is the amount of heat required to change one mole of a substance from the solid to the liquid state.
In this case, we can calculate the latent heat of fusion by using the formula Q = m * Lf, where Q is the heat required, m is the mass of the substance, and Lf is the latent heat of fusion.
For the given scenario with 18.5 kg of the unknown substance and 1.20 E6 Joules of heat needed, we can calculate the latent heat of fusion as:
Convert 1.20 E6 J to kJ: 1.20 E6 J = 1200 kJ
Calculate Lf: Lf = Q / m = 1200 kJ / 18.5 kg
Lf = 64.86 kJ/kg
Neutron stars consist only of neutrons and have unbelievably high densities. a typical mass and radius for a neutron star might be 9.9 x 1028 kg and 1.9 x 103 m. (a) find the density of such a star. (b) if a dime (v = 2.0 x 10-7 m3) were made from this material, how much would it weight (in pounds)?
What type of weather modification involves the use of large fans to mix surface air with air aloft?
In weather modification, the use of large fans to mix surface air with air aloft is referred to as forced convection. Forced convection, influenced by external forces like fans, allows for a cycling of air by bringing cooler higher altitude air down while propelling warmer surface air up. This is used to improve weather conditions such as reducing smog or fog.
Explanation:The type of weather modification that involves the use of large fans to mix surface air with air aloft is called forced convection. In forced convection, the flow of air (or other matter) is encouraged by external forces like fans. To understand this, you need a certain knowledge of thermodynamics.
For instance, similar to the way a house fan works by moving cooler air in to replace warmer air, large fans in a weather modification context can be used to promote air movement on a larger scale. This is done by drawing cooler, higher altitude air down to the ground, while pushing warmer surface air up, thus creating a cycle of air called convection.
This process is used for various purposes such as reducing ground-level fog or smog. An interesting example of a natural occurrence of forced convection is shown in Figure 3.1, where a weak cold front of air pushes smog over the Yellow Sea, capturing by NASA's Terra satellite in 2012.
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The separation of colors by refraction is called:
Which is an example of nuclear energy being converted into heat and light energy?
a.the sun
b.a volcano
c.a rocket engine
d.a coal burning power plant?
Which of the following statements most accurately differentiates potential and kinetic energy?
A. Any object that has motion has kinetic energy, while any object not in motion but with the potential to do work has potential energy.
B. Gravitational potential energy is a form of mechanical energy, while kinetic energy is not.
C. Any object that has motion has potential energy, while any object not in motion but with the potential to do work has kinetic energy.
D. Kinetic energy is a form of mechanical energy, while gravitational potential energy is not.
Answer:
A. Any object that has motion has kinetic energy, while any object not in motion but with the potential to do work has potential energy.
Explanation:
Kinetic energy is associated to the motion energy in which object moves with certain speed.
It is given by the formula
[tex]E_k = \frac{1}{2}mv^2[/tex]
Now similarly we can define potential energy as the energy stored in an object which is due to its position and the object must be at rest.
It may be of gravitational potential energy or spring potential energy or any other type
Gravitational potential energy is given as
[tex]E_p = mgh[/tex]
both kinetic energy and potential energy is part of mechanical energy
so correct answer would be
A. Any object that has motion has kinetic energy, while any object not in motion but with the potential to do work has potential energy.
Explain whether an object can have kinetic energy and potential energy at the same time
Yes, an object can have both kinetic energy and potential energy at the same time, such as a ball during its flight. These forms of energy can transform into each other without external work in a closed system.
An object can indeed have both kinetic energy and potential energy at the same time. For instance, a ball thrown in the air has kinetic energy due to its motion and potential energy due to its height above the ground. As it rises, its kinetic energy decreases while its potential energy increases, and vice versa when it falls back down. Energy transformation between kinetic and potential energy occurs without the need for external work if no friction or air resistance is present. In a closed system where no energy is lost to the environment, the sum of potential and kinetic energy remains constant according to the conservation of energy principle.
Two pieces of pure copper are shown below. The two pieces must have the same ?
The two pieces of pure copper must have the same temperature. The correct option is A.
What is density?The density is the ratio of the mass and the volume of the object. It is denoted by ρ.
ρ = mass/Volume = m/V
Given are the two pieces of pure copper. One is cube in shape and another is cuboid.
Both will have different volume. As volume is related to the mass and density. So, they are also different for the two pieces of copper. But, the temperature does not depends on the remaining parameters.
Thus, the correct option is A.
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Two identical cars, one on the moon and one on earth, are rounding banked curves at the same speed with the same radius and the same angle. the acceleration due to gravity on the moon is 1/6 that of earth. how do the centripetal accelerations of each car compare?
a.the centripetal acceleration of the car on earth is less than that on the moon.
b.the centripetal acceleration of the car on earth is greater than that on the moon.
c.the centripetal accelerations are the same for both cars.
d.this cannot be determined without knowing the radius and the
Final answer:
The centripetal accelerations of two identical cars rounding banked curves at the same speed, radius, and angle on Earth and the Moon are the same since the formula for centripetal acceleration, which is velocity squared divided by radius, does not depend on the local acceleration due to gravity.
Explanation:
When comparing the centripetal accelerations of two identical cars rounding banked curves with the same speed, radius, and angle, one on Earth and one on the Moon, an important factor to consider is the acceleration due to gravity on each body. The formula for centripetal acceleration (ac) is ac = v²/r, where v is the velocity of the car and r is the radius of the circular path.
Given that both cars have the same speed (v) and radius (r), and that the centripetal acceleration is not directly dependent on gravity, the centripetal accelerations will be the same for both cars. It is essential to note that the gravitational force would affect the normal force and the friction available, but this does not change the centripetal acceleration required to keep the cars on their paths. Therefore, the correct answer is: c. the centripetal accelerations are the same for both cars.
Satellite A has an orbital radius 3.00 times greater than that of satellite B. Satellite B's orbital period around Earth is 120 minutes. What is satellite A's orbital period?
Using Kepler's Third Law, the period of Satellite A, which has an orbital radius 3 times greater than that of Satellite B with a period of 120 minutes, is calculated to be approximately 519.6 minutes.
Explanation:The period of Satellite A, with an orbital radius 3 times greater than Satellite B, can be found using Kepler's Third Law, which relates the orbital period of a satellite to its orbital radius. Kepler's Law states that the square of the orbital period is proportional to the cube of the radius of its orbit. Since Satellite B has an orbital period of 120 minutes, we can set up the proportion (T_A/T_B)^2 = (R_A/R_B)^3, where T_A is the unknown period of Satellite A, T_B is the known period of Satellite B, R_A is the orbital radius of Satellite A and R_B is the orbital radius of Satellite B. Because R_A is 3 times R_B, the proportion becomes (T_A/120 min)^2 = 3^3. Therefore, T_A = 120 min x √(3^3), which simplifies to T_A = 120 min x 3√3. After calculating, T_A's period is found to be approximately 519.6 minutes.
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Which has more momentum, a heavy truck moving at 30 miles per hour or a light truck moving at 30 miles per hour?
Answer: The heavy truck
Explanation: Momentum is defined as the amount of movement.
It can be written as P = m*v
Where P is the momentum, m is the mass of the object and v is the velocity.
So you can see that if the mass increases, also does the momentum, so if both trucks move at the same velocity, then the truck with the bigger mas will have a bigger momentum.
Then the correct answer is the heavy truck
Which is an example of a positive feedback loop? i. warmer temperatures on earth's surface decrease the evaporation of water. ii. water evaporation creates low-altitude clouds that reflect sunlight back into clouds. iii. water evaporation creates high-altitude clouds which absorb terrestrial energy that would otherwise escape the atmosphere?
The example of positive feedback is, " warmer temperatures on earth's surface decrease the evaporation of water."
What is positive feedback?Positive feedback is a type of feedback that focuses on strengths, contributions, and value.Positive feedback can be as same as the positive reinforcement.Positive feedback is amplifying or magnifying the change or output.The response effect is magnified so that it can occur much faster.In this form of feedback, the output of the system is enhanced.Conversely, in negative feedback, the output is decreased or inhibited.Condition of hysteresis is exhibited by positive feedback.Examples for positive feedback is,Warmer temperature on the earth's surface decreases the evaporation of water.
Because, the temperature of the earth will become hot , cold, warm etc.. this happens due to the evaporation of water.
Hence, Option A is the correct answer.
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Which law explains why when you bump into something you fall backwards
Answer:
Newton's 3rd Law
Explanation:
All isotopes of hydrogen contain
A.One Neutron
B.Two Electrons
C.One Proton
D.Two Nuclei
The slope of the line on a speed-time graph tells the speed , true or false ?
Why does it require much less force to accelerate a low mass object than it does to accelerate a high mass object the same amount?
Final answer:
It takes less force to accelerate a low mass object compared to a high mass object by the same amount because acceleration is inversely proportional to mass, as stated in Newton's second law of motion (F = ma).
Explanation:
Understanding Force and Acceleration
The student's question concerns why it takes less force to accelerate a low mass object compared to a high mass object by the same amount. This is explained by Newton's second law of motion, which states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
The law is usually written as F = ma, where F is the force applied, m is the mass of the object, and a is the acceleration. When you apply the same force to two objects of different masses, the object with lower mass will experience a greater acceleration because acceleration is inversely proportional to mass.
For example, applying a force to a basketball will result in a greater acceleration than applying the same force to a car, assuming all other factors such as friction are negligible. This is because the basketball has a smaller mass compared to the car.
Similarly, Newton's second law can be used to calculate how a person's weight, or the force of gravity on the person, changes when on a different planet like the Moon, which has a lower acceleration due to gravity compared to Earth. This principle not only applies to linear motion but also to rotational motion. The angular acceleration of an object is also inversely proportional to its mass, meaning a lighter object will spin faster when the same rotational force is applied to it.
What will be the acceleration of a 40-kilogram object that is pushed with a net force of 80 newtons?
what is an equilibrant?
an object that has zero net force acting on it
a force that makes the net force on an object zero
two chemical reactions proceeding at the same rate in opposite directions
a force in the same direction as the net force
Globalization concerns many workers because ________.
Answer:
Companies will tend to seek lower costs by outsourcing labor
Explanation:
Globalization, in its current form, is led by the large multinationals and neoliberalism. Thus, large corporations settle in many underdeveloped countries in search of abundant raw material and cheap labor. This cheap labor has no alternative but to be subjected to low wages, which, in general terms, ends up shaping the source of misery worldwide. This has been worrying many workers, as the cheapness of mother labor results in lower quality of life for them and their families.
A topic list is a list of important content and material which will be covered on a test. Please select the best answer from the choices provided T or F
The coefficients in a balanced chemical equation always can express the ratio of
A. Moles of reactants and products
B. Volume of reactants and products
C. Atoms and reactants and products
D. Mass of reactants and products
The coefficient of the balanced chemical equation always express the ratio of moles of reactants and the products as before performing the stoichiometric calculations, the equation should be balanced and the stoichiometric coefficient of the given reactant or product is the number of molecules participating in that equation. The stoichiometric calculations are mostly done in moles rather than in molecules.
15 points for 2 questions
1. your family is moving to a new home. While lifting a box 1.5m straight up to put it on a truck, you exert an upward force of 200N. Calculate the amount of work you did.
A) 133J
B) 198.5J
C) 201.5J
D) 300J
2. A truck pulls a trailer at a constant velocity for a 100m while exerting a force of 480N. Calculate the work done.
A) 4.8J
B) 380J
C) 48,000J
D) 580J
1. D) 300 J
The work done by a constant force is given by:
[tex]W=Fdcos \theta[/tex]
where F is the force applied, d is the distance, and [tex]\theta[/tex] is the angle between the direction of the force and the direction of motion.
In this problem, F=200 N, d=1.5 m while [tex]\theta=0^{\circ}[/tex], because the force is parallel to the motion of the box, therefore the work done is
[tex]W=(200 N)(1.5 m)(cos 0^{\circ})=300 J[/tex]
2. C) 48,000 J
We can use the same formula used in the previous part of the problem:
[tex]W=Fdcos \theta[/tex]
In this case:
F=480 N
d=100 m
[tex]\theta=0^{\circ}[/tex]
So the work done is
[tex]W=(480 N)(100 m)(cos 0)=48,000 J[/tex]
Explain how two rolling bowling balls of different masses can have the same momentum.
According to the principle of conservation of momentum, two bowling balls of different masses can maintain the same momentum as long as the product of their mass and velocity is identical. Essentially, a lighter ball would need to move faster and a heavier ball slower to achieve the same momentum.
Explanation:The subject matter of your question is fundamentally linked to the principle of conservation of momentum which states that the total momentum of a closed system remains constant if no external forces act upon it. Momentum, denoted as 'p', is the product of an object's mass 'm' and its velocity 'v' (p=mv).
Therefore, even if two bowling balls have different masses, they can still have the same momentum if their velocities compensate for the difference in mass. For instance, a lighter ball (smaller m) would need to be moving faster (higher v), while a heavier ball (larger m) would need to be moving slower (smaller v).
Consider this example: a 5 kg bowling ball moving at 2 m/s and a 10 kg bowling ball moving at 1 m/s. Even though the balls have different masses, their momenta are the same (5 kg * 2 m/s = 10 kg * 1 m/s = 10 kg m/s).
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a partially inflated weather balloon has a volume of 1.56 * 10^3 L and a pressure of 98.9 lPa. What is the volume of the balloon when the ballon is released to a height where the pressure is 44.1 kPa
Compared to gamma rays, X-rays have relatively
Answer:
Longer length.Less energy.Less temperature.Less frequency.Explanation:
X-Rays are ''minor'' electromagnetic waves than Gamma Rays.
Gamma rays are the strongest waves in the electromagnetic spectrum with a length order of [tex]10^{-12}[/tex], which indicates a really intensive frequency, those characteristics allow to display a high energy amount.
The second most intense electromagnetic waves are X-Rays, stronger that ultraviolet, visible, infrared, microwaves and radio waves; but weaker than Gamma Rays.
Calculate 2 x 10^-3cm ÷ 2.5 x 10^4cm
The calculation of 2 x 10^-3 cm ÷ 2.5 x 10^4 cm, translated in scientific notation ends up with a result of 8 x 10^-8 cm.
Explanation:To calculate 2 x 10^-3 cm ÷ 2.5 x 10^4 cm, you start by performing the multiplication and division operations separately. That gives us (2*10^-3) cm and (2.5*10^4) cm. Before dividing these two results, make sure they're expressed in the same scientific notation. It's important to note that multiplying or dividing quantities in scientific notation involves separately multiplying or dividing the coefficients and adding or subtracting the exponents, respectively.
In this case, the calculation would be (2 ÷ 2.5) x 10^(-3-4), which simplifies to 0.8 x 10^-7. This can also be represented as 8 x 10^-8 cm.
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Kepler used the observations and data of which scientist to formulate his laws of planetary motionSir Isaac Newton
Tycho Brahe
Galileo Galilei
Nicholas Copernicus
The scientist Kepler was known to have relied on observations and data of Tycho Brahe to formulate his laws of planetary motion.
Who is Kepler?Kepler is the scientist who is credited with the three laws of planetary motion. These laws set the tone fro the advances in the study of astronomy today.
However, the scientist Kepler was known to have relied on observations and data of Tycho Brahe to formulate his laws of planetary motion.
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Biomes can be classified geography? true or false
I am confused on how this table works
Which processes transfer energy from the core to the photosphere
How long does a radar signal take to travel from earth to venus and back when venus is brightest?
Given data :
Velocity of radar signal, v = Velocity of light = 3 x 10^8 m/s
Greatest distance between Venus and Earth d1 = 0.47 AU = 0.47 AU (a.5 x 10^11 m / 1 AU) = 7.1x10^10 m
Closest distance between Venus and Earth, d2 = 0.28 AU = 0.28 AU (1.5 x 10^11 m / 1 AU)= 4.2 x 10^10 m
The time take by radar signal to travel from Earth to Venus and back when Venus is brightest is calculated as
T1 = 2d1/v = 2(7.a x 10^10 m / 3 x10^8 m/s) = 473 s
The time taken by radar signal to travel from Earth to Venus and back when Venus is closest is calculated as
T2 = 2d1/v = 2 (4.2 x 10^10 m) / 3 x 10^8 m/s = 280 s