How much heat is needed to change 5.42 grams of solid gold to liquid gold at its melting point of 1,063°C? The latent heat of fusion of gold is 66.6 J/g.

Answers

Answer 1

[tex]5.42 \times 66.6 = 360.972[/tex]
360.972 J
Answer 2

Answer:

360.97 J

Explanation:

mass of gold, m = 5.42 g

Latent heat of fusion, L = 66.6 J/g

The amount of heat required to convert 1 kg of solid into liquid state at its melting point is called latent heat.

L = Heat / mass

So, L = Q / m

Q = m L

Where, Q is the amount of heat supplied and L be latent heat of fusion amd m be the mass of substance.

Q = 5.42 x 66.6

Q = 360.97 J

Thus, the amount of heat required to melt the desired amount of gold is 360.97 J.


Related Questions

What effect does the removal of vegetation have on soil ?

Answers

Hello!

The removal of vegetation causes the desertification and erosion of soil. The roots of the plants that are inside the soil create a sort of net that prevents the material to be dragged by the water from the rain. They also absorb any excess water that can weaken the soil structure. If vegetation is removed from the soil, the nutrients can be dragged by water currents and slowly the desertification will occur. 

Have a nice day!

Ohm’s law is I = V ÷ R. What is the current of a circuit with a 3.0-volt battery and 1.0 ohm of resistance? The current of a circuit with a 3.0-volt battery and 1.0 ohm of resistance is (blank) amps.

Answers

current = voltage \ resistance
x= 3 \ 1
x = 3 amps

Final answer:

Using Ohm's Law, which states I = V / R, the current of a circuit with a 3.0-volt battery and 1.0 ohm of resistance is calculated to be 3.0 amperes.

Explanation:

Calculating Current with Ohm's Law

Ohm's Law describes the relationship between current (I), voltage (V), and resistance (R) in an electrical circuit, stating that I = V / R. To calculate the current in a circuit with a 3.0-volt battery and 1.0 ohm of resistance, you would use the formula I = V / R. Plugging the values into the formula gives us I = 3.0 V / 1.0 Ω, which simplifies to I = 3.0 A. Therefore, the current of the circuit would be 3.0 amperes.

The buoyant force on an object fully submerged in a liquid depends on (select all that apply)
Answer

1. the object’s mass.

2. the object’s volume.

3. the density of the liquid.

4. the mass of the liquid

Answers

2. The object's volume.
 3. The density of the liquid.  
Remember what the buoyant force is. It's the lifting force caused by the displacement of a fluid. I'm using the word fluid because it can be either a liquid or gas. For instance a helium balloon floats due to the buoyant force exceeding the mass of the balloon. So let's look at the options and see what's correct. 
 1. Object's mass
 * This doesn't affect the buoyant force directly. It can have an effect if the object's mass is lower than the buoyant force being exerted. Think of a boat as an example. The boat is floating on the top of the water. If cargo is loaded into the boat, the boat sinks further into the water until the increased buoyant force matches the increased mass of the boat. But if the density of the object exceeds the density of the fluid, then increasing the mass of the object will not affect the buoyant force. So this is a bad choice. 
 2. The object's volume.
 * Yes, this directly affects the buoyant force. So this is a good choice. 
 3. The density of the liquid.
 * Yes, this directly affects the buoyant force. You can drop a piece of iron into water and it will sink. You could also drop that same piece of iron into mercury and it will float. The reason is that mercury has a much higher density than water. So this is a good choice. 
 4. Mass of the liquid
 * No. Do not mistake mass for density. As a mental exercise, imagine the buoyant force on a small piece of metal dropped into a swimming pool. Now imagine the buoyant force on that same piece of metal dropped into a lake. In both cases, the buoyant force is the same, yet the lake has a far greater mass of water than the swimming pool. So this is a bad choice.

The buoyant force on an object fully submerged in a liquid depends on the object's volume.and the density of the liquid.  

What is  buoyant force ?

Buoyant force also known as upthrust, is an upward force exerted by a fluid that resists the weight of a partly or completely submerged object.

The weight of the overlying fluid causes pressure to rise with depth in a column of fluid.

The buoyant force on an object fully submerged in a liquid depends on the object's volume.and the density of the liquid.  

Hence option 1 and 3 is correct .

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A tow truck exerts a force of 3000 n on a car, accelerating it at 2 meters per second per second. what is the mass of the car?

Answers

If the force is 3,000 N and the acceleration is 2 m/s/s. The mass of the car is 1,500 grams (or whatever unit of mass or weight is used in the answer- pounds, kilograms e.t.c.).

A box of mass 3.0 kg is accelerated from rest across a floor at a rate of 3.0 m/s2 for 4.0 s . what is the net work

Answers

Work done is given by multiplying force and distance.
Therefore; W = Force × distance
  but from the second newton's law of motion F=ma
Therefore; W = (ma) × d
Using; V= U + at
 V = 0 + (3×4)
 V = 12 m/s
 But d = (V+U)/2 (t)
        d = 12/2 (4)
           = 24 M
Hence;  W = ( 3 ×3 )× 24
                  = 216 J

an object which has a mass of 70 kg is sitting on a cliff 10m high calculate the objects potential energy. given g=10m/s^2

A.7,000 Joules
B. 3,500 Joules
C. 700 Joules
D. 70 Joules
E. 35 Joules

Answers

7,000 joules as MGH is the equation so 70kg * 10 m/s^2 *10m

Answer: Potential Energy = 7,000 Joules(A)

Explanation:

Potential Energy is the energy possessed by the virtue of its position and it is given as,

P. E = mgh

Where m is the mass= 70kg

g is acceleration due to gravity =10m/s²

h= height = 10m

P. E = 70×10×10

P. E= 7000J

Therefore the potential energy is 7000J

Power can be expressed
1. in joules per watt, or in newtons per second
2. in joules per second, or in watts
3. in joules, or in newton-meters

Answers

By definition Power is energy per second.  As units the Watt, and a Watt is joules/second (2)

Power in physics is the rate at which energy is transferred, correctly measured in joules per second or watts. Option 2

Power in physics is defined as the rate at which work is done or the rate at which energy is transferred. This rate is typically measured in joules per second (J/s), which is also known as a watt (W). To clarify the options provided in the question, power cannot be correctly expressed in joules per watt or newtons per second as these do not represent the rate of energy transfer.

Instead, power is correctly expressed in joules per second, which is equivalent to watts. For instance, a device like a light bulb that uses electrical energy to produce light and heat will have its power consumption rated in watts. The higher the wattage, the more power it consumes over a given period of time.

Additionally, power is sometimes measured in units such as the horsepower (hp), where 1 hp equals 746 watts. Furthermore, it is important to realize that terms like kilowatt-hour (kWh) are units of energy, not power. For instance, a 2000-watt iron would use 2 kWh of energy over one hour, which is equal to 2 x 3.6 million joules. Option 2

Why does gravity pull things with mass toward it?

Answers

All objects have mass which attach to each other.

Which statement is true?Select one of the options below as your answer: A. Gas atoms subjected to electricity emit bright lines. B. Gas atoms absorb white light and emit a continuous spectrum of light. C. Gas atoms under high pressure emit dark lines against a continuous spectrum. D. Gas atoms heated to a high temperature emit white light. E. Gas atoms subjected to electricity do not emit a spectrum,

Answers

D. Gas atoms heated at high temperature emit white light. This happens when the atoms and molecules that contain a hot gas emit a certain light with wavelengths that produce a white light and bright lines. Light has a continuous spectrum that passes from one color to another without interruption.
The answer is A. Gas atoms subjected to electricity emit bright lines of light. This shows why particles behave like a way .This is the reason why we see the lightning's color. Lightning comes from the static energy and it interacts with the gas atoms.

An atom that has a negative four charge will have which of the following?Answer 4 more protons than electrons An equal amount of protons and electrons 4 more electrons than protons 2 more neutrons than protons,

Answers

An atom with a negative four charge will have 4 more electrons than protons.

An atom that has a negative four charge will have 4 more electrons than protons. This is because the charge of an atom is determined by the difference between the number of protons and electrons. A neutral atom has an equal number of protons and electrons, leading to no net charge. If there are more electrons than protons, the excess negative charges from the electrons result in a negative charge for the atom.

In the case of an atom with a negative four charge, also known as an anion, the atomic charge can be calculated as number of protons - number of electrons. Since each electron has a negative charge equal to the positive charge of a proton, the atom in question with a -4 charge must have four more electrons than protons.

A person weighing 0.70 kn rides in an elevator that has an upward acceleration of 1.5 m/s2. what is the magnitude of the normal force of the elevator's floor on the person?

Answers

First of all, we can find the mass of the person, since we know his weight W:
[tex]W=mg=0.70 kN=700 N[/tex]
And so
[tex]m= \frac{W}{g}= \frac{700 N}{9.81 m/s^2}=71.4 kg [/tex]

We know for Newton's second law that the resultant of the forces acting on the person must be equal to the product between the mass and the acceleration a of the person itself:
[tex]\sum F = ma[/tex]
There are only two forces acting on the person: his weight W (downward) and the vincular reaction Rv of the floor against the body (upward). So we can rewrite the previous equation as
[tex]R_v -W = ma[/tex]
We know the acceleration of the system, [tex]a=1.5 m/s^2[/tex] (upward, so with same sign of Rv), so we can solve to find the value of Rv, the normal force exerted by the elevator's floor on the person:
[tex]R_v = ma+W=(71.4 kg)(1.5 m/s^2)+700 N =807N[/tex]
Final answer:

The magnitude of the normal force of the elevator's floor on the person, given the person weighing 0.70 KN and the elevator accelerating upward at 1.5 m/s², is approximately 800 N.

Explanation:

This problem falls under the domain of Physics, specifically involving Newton's laws and the concept of the normal force within the context of elevator motion. To address the scenario of a person weighing 0.70 KN riding in an elevator that is accelerating upward at 1.5 m/s2, we need to understand the person's experienced force, otherwise known as normal force.

The normal force can be calculated using Newton's Second Law, F=ma, and knowing that the normal force equals the weight plus the product of the mass and acceleration when the elevator is moving upwards. In this case, the person's weight on Earth is equal to the force of gravity on them; with gravity being roughly 9.8 m/s2, the person's mass (m) would be their weight (w) divided by gravity (g), giving m = 0.70 KN / 9.8 m/s2 ≈ 71.4 kg.

The normal force (Fn) on upwards acceleration is given by Fn = m*(g+a), where a is the acceleration of the elevator. Substituting the given figures for m, g, and a we find Fn = 71.4 kg * (9.8 m/s2 + 1.5 m/s2) =~ 800 N (rounded to the nearest integer). Therefore, the magnitude of the normal force of the elevator's floor on the person is about 800 N.

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At which of the following angles will the sunlight received at a location on Earth fall over the smallest area? 80° 65° 40° 10°

Answers

Answer: D. 10 degree angle

All places on Earth received sunlight but in different angles. The smallest area, which is the north of the Arctic Circle receive sunlight at a 10 degree angle because of the tilted axis of rotation. Usually, the sun’s rays are the most intense at the equator and the least intense at the poles as Earth revolves around the sun.

 

Answer:

The angle that will fall over the smallest area is 10

Explanation:

How do elements form?
A) Through fusion in stars and supernova
B)Through the cooling of molten lava
C)Through the evaporation of seawater
D)Through chemical reactions

Answers

the answer is A. through fusion in stars and supernova.

Answer:

A) Through fusion in stars and supernova

Explanation:

took the test and got it right

explain how a diode is like a one way street

Answers

The diode is like a one-way street because it allows current to flow to only one direction in the circuit.

In fact, a diode consists of a p-n junction, with a n-type region with excess of electrons and a p-type region with excess of holes. Both ends are connected to two terminals of a battery, so a voltage difference can be applied across the junction.

When no voltage is applied, electrons from the n-region combine with the holes from the p-region in the area near the junction, creating the so-called depleting region, which acts as an insulating area.

To get rid of this depleting area, the n-type region must be connected to the negative terminal of the battery while the p-type region to the positive terminal of the battery. This way, electrons from the n-region are repelled from the negative terminal and start to flow towards the positive terminal (and the holes do the same in the opposite direction), creating a net current flowing through the depletion region. Instead, when the n-type region is connected to the positive terminal of the battery, the electrons are attracted by that terminal, so they do not flow through the depletion region (and same for the holes in the p-region) and so there is no net current across the junction. Therefore, current in a diode flows only in one direction.

If the cross-section of a wire of fixed length is doubled, how does the resistance of that wire change? (this is for studying for my semester exam. I got the question wrong on one of my chapter tests so I'm trying to find out what the correct answer was)

A. Halved
B. Doubled (I know it's NOT this cause that was the wrong one)
C. Unchanged
D. Quadrupled

Answers

If the cross-section of a wire of fixed length is doubled,  the resistance of that wire change into doubled.We know that the total length of the wires will affect the amount of resistance.  The longer the wire, the more resistance that there will be so the answer is doubled.

An Olympic sprinter can go from a state of rest to 11 meters per second in 10 seconds. What is the average acceleration of the sprinter?
A. 0.9 m/s
B. 110 m/s²
C. 110 m/s
D. 1.1 m/s²

@Vonte12,

Answers

the answer is D since to calculate acceleration is used the formula a = delta v over delta t where delta v is the final velocity 11m/s less initial velocity 0m/s so delta v is 11m/s and delta t is final velocity 10s less initial velocity that always will be 0 then 10 - 0 = 10 so a = 11 over 10 that is 1.1m/s^2 (remember that is squared)

Which consumes more energy, a 1.3 kw hair dryer used for 10 min or a 10 w night light left on for 24 hr?

Answers

night light consumes more energy
energy consumed by hair dryer= 1300w x 60 x 10  =780000
energy consumed by night light = 10 x 24 x 60 x60 =864000

The 1.3 kW hair dryer consumes less energy than the 10 W night light. Calculations show that the hair dryer uses 0.2167 kWh, while the night light uses 0.24 kWh.

The 1.3 kW hair dryer used for 10 minutes consumes more energy compared to the 10 W night light left on for 24 hours. To calculate energy consumption, we use the formula: Energy = Power x Time. For the hair dryer: Energy = 1.3 kW x (10 min / 60 min) = 0.2167 kWh. For the night light: Energy = 10 W x 24 hours = 0.24 kWh. Therefore, the hair dryer consumes less energy.

Please help me answer these questions ASAP !

Answers

1. Layer A is the oldest. The law of superposition says that the oldest layer is at the bottom whilst the newest is at the top.
2. The law of original horizontality.
3. The law of original lateral continuity.

"which forms of light are lower in energy and frequency than the light that our eyes can see"

Answers

Electromagnetic radiation covers a wide spectrum of which we can only see an extremely small sliver (wavelength between 390 nm and 740 nm).

The electromagnetic radiation with a wavelength greater than 740 nm meets the given criterion. This mainly consists of infrared, microwave, and radio waves. 

If you want to see something really interesting, Google the wavelength of Hawking radiation! 
Final answer:

Infrared light, microwave radiation, and radio waves are all forms of light that have lower energy and frequency than what our eyes can perceive. These forms of light are part of the electromagnetic spectrum and have various applications in technology.

Explanation:

The forms of light that are lower in energy and frequency than the light that our human eyes can see are infrared light, microwave radiation, and radio waves. These forms of light make up part of the electromagnetic spectrum, which ranges from high-frequency, high-energy gamma rays to low-frequency, low-energy radio waves.

In relation to the visible light we see, these energies are less, and therefore their frequencies are also lower. To illustrate, infrared light is just below red light on the spectrum and is often associated with heat radiation. Microwave radiation is commonly used in technologies such as microwave ovens and wireless communication devices, and radio waves are the longest and hence the lowest energy/frequency waves in the spectrum, utilized in broadcasting signals such as television and radio.

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PLEASE HELP ME


In a vasectomy, which part of the anatomy is cut or tied off?

A. testes
B. vas deferens
C. urethra
D. seminal vesicles

Answers

The answer is B. Vas deferens.

The Vas deferens is a tube that carries the sperm from your testes to the urethra and out the body. A vasectomy is a form of birth control where the pathway of sperm is blocked through cutting or tying off the vas deferens. The word Vasectomy comes from the term Vas deferens.

Answer: Vas deference

Explanation: This is a method of contraception in uses a small surgical procedure. This method is a permanent method of contraception.

During this procedure, male vas deference are cut and tied together or we can say it is sealed to prevent the path of sperm from getting into the urethra and in this way it prevents fertilization of a females egg during the sexual intercourse.

Identify five main components of the atmosphere

Answers

Nitrogen,Oxygen, Argon,Carbon dioxide,and water vapor are the five main components of the atmosphere.

What is the transfer of energy to an object using a force that causes the object to move in the direction of the force?
a. movement
b. power
c. work
d. force?

Answers

C. Work
[tex]w = f \times d[/tex]
*Work is measured in Joules.

Vector A??? has a magnitude of 2.00 m and vector B??? has a magnitude of 5.00 m. If the direction of each vector is unknown, what is the largest possible value for the magnitude of A??? ???B??? ?

Answers

If the two vectors decide to work together, practice teamwork
and cooperation, and both push in exactly the same direction,
then they can team up to make a single vector of (2m + 5m) = 7m .
Final answer:

The largest possible magnitude of the two vectors A and B when added is the sum of their individual magnitudes, in this case, 7.00m. This occurs when the vectors are arranged in the same direction.

Explanation:

In the field of Physics, particularly when dealing with vectors, the magnitude of the sum of two vectors (like A + B) can be at its biggest when the vectors are aligned in the same direction. In this case, the magnitudes, or lengths, of the vectors simply add up.

Here, you have one vector A, which has a magnitude of 2.00m, and another vector B, which has a magnitude of 5.00m. The largest possible magnitude of these two vectors when added (denoted by A + B) would be 2.00m + 5.00m = 7.00m. This happens when vectors A and B are in the same direction.

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What is one property of a wave that determines how much it will diffract when it encounters an obstacle?
-speed
-amplitude
-polarization
-wavelength

Suppose two waves collide, and the temporary combined wave that results is smaller than the original waves. What term best describes this interaction?
-diffraction
-destructive interfernce
-standing wave formation
-constructive interfernce

The formation of a standing wave requires
-the traveling of a wave for a long distance
-constructive interference between two waves of slightly different frequencies
-that refraction and diffraction occur at the same time in a wave
-interference between incoming and reflected waves

Answers

1) D  -wave length 
2) B-destructive interference 
3)D -interference between incoming and reflective waves

you can feel the heat waves from small electric heater on your hands and face even though the heater is on the other side of the room this is an example of

Answers

radiation
hope this helps

Final answer:

Feeling the heat from a heater at a distance is an example of heat transfer by radiation, where electromagnetic waves emitted by the heater are absorbed by the skin, causing a warming sensation.

Explanation:

Feeling the heat waves from a small electric heater on your hands and face, even though the heater is on the other side of the room, is an example of heat transfer by radiation. This occurs when a hot body like a heater emits electromagnetic waves that travel through the space and are absorbed by your skin, warming you without the need for a medium. This type of heat transfer is the same that occurs when we feel the warmth from the Sun or when an oven warms us as we walk by.

The atomic model that describes an atom as a spherical object containing a certain number of electrons trapped in a mass of positive charge is often called ____ model.

Answers

Answer: raisin pudding model or plum pudding model

This atomic model was developed in 1904 by the British scientist J.J. Thomson, from his discovery of the existence of the electron in 1897.

Taking into consideration that at that time there was still no evidence of the atom nucleus, Thomson thought the electrons (with negative charge) were immersed in a substance (the atom) of positive charge that counteracted the negative charge of the electrons. Just like the raisins embedded in a pudding or bread.

That is why this model was called the raisin pudding atomic model

You drive in a straight line at 24.0 m/s for 8.0 miles, then at 30.0 m/s for another 8.0 miles. What is the average velocity?

Answers

8 miles = 12874.8m 
Total distance = 16 miles = 25749.5m 
 time = distance/velocity
 First instance, t =12874.8/24
  = 536.45 
 Second instance, t = 12874.8/30
  = 429.16 
 Total time = 536.45 + 429.16 = 965.61 
 Average velocity = Total distance / Total time
  = 25749.5/965.61
  = 26.67 m/s

What is the current in a series circuit with a resistance of 30 ohms and a potential difference of 120 volts?

Answers

0.25A....................

Which statement describes how echolocation and ultrasound imaging are the same?

A.They both use the absorption of sound waves.
B.They both use the diffraction of sound waves.
C.They both use the reflection of sound waves.
D.They both use the transmission of sound waves.

Answers

They both use the reflection of sound waves.

Answer: The correct option is C.

Explanation:

The sound wave is reflected back after striking from the barrier. This is called the reflection of the sound.

When the sound wave incidents on the barrier then it is called incident wave.

When the sound wave gets reflected back from the barrier then it is called reflected wave.

Ultrasound imaging is a medical technique which is used to take the image of the internal parts of organ of the body.

Echolocation is the process which is used by several species. It is used by bats to locate its prey. It is the biological SONAR.

Therefore, echolocation and ultrasound imaging are same as they both use the reflection of sound waves.

The weight of a synthetic ball varies directly with the cube of its radius. a ball with a radius of 2 inches weighs 5.605.60 pounds. find the weight of a ball of the same material with a​ 3-inch radius.

Answers

The weight of the ball m is directly proportional to the cube of the radius, [tex]r^3[/tex]. This means that the ratio between the weight of the ball with radius 3-in and 2-in should be equal to the ratio between the cubes of the two radii:
[tex] \frac{m_3}{m_2}= \frac{(3 in)^3}{(2 in)^3} [/tex]
So we can find the weight of the ball when its radius is 3 inches:
[tex]m_3 = m_2 \frac{(3 in)^3}{(2 in)^3}= (5605.60 p) \frac{3^3}{2^3}=18919 pounds [/tex]
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