Given that:
Mass (m) = 20 g = 0.02 Kg,
temperature (T₁) = -10°C = -10+273 = 263 K
temperature (T₂) = 10°C = 10+273 = 283 K
Specific heat of water (Cp) = 4.187 KJ/Kg k
We know that Heat transfer (Q) = m. Cp.( T₂ - T₁)
= 0.02 × 4.187 × (283-263)
Q = 1.67 KJ
Heat transferred is 1.67 KJ
In optics, a diffraction ___________ is an optical component with a periodic structure, which splits and diffracts light into several beams traveling in different directions
Answer:
grating
Explanation:
Diffraction is a phenomenon in which light bends at the edges of an object because of which light falls even in the shadow region.
Diffraction grating consists of thousands of slits through which the light splits. The diffracted light travels in different directions and forms a alternate dark and bright fringes.
If a 1000 kg cannon at initialy at rest fires a 10 kg cannonball at 200 m/s, what is the final velocity of the cannon?
Since the whole cannon AND the lead cannonball inside it are starting out motionless, there's no momentum before the shot.
We know that momentum is conserved, so the total momentum after the shot must also be zero. This tells us that whatever momentum the ball carries away in THAT ===> direction, the cannon itself will have the same amount of momentum in THIS <=== direction. That way, they'll add up to zero like we need them to.
The physics we need: Momentum = (mass) x (velocity)
OK. All students hearing protection ready now. Ready on the left. Ready on the right. Ready on the firing line. Cannon discharge in three. Two. One. ZERO. BOOM !
-- 10 kg ball flying THAT way ==> at 200 m/s.
Momentum= (10kg)x(200 m/s THAT==>way = 2,000 kg-m/s THAT==>way
-- Cannon momentum = (1000 kg) x (velocity THIS <== way)
Cannon momentum = 2,000 kg-m/s THIS<==way
(1000 kg) x (velocity) = 2,000 kg-m/s this<==way
Divide each side by (1,000 kg):
Velocity = (2,000 kg-m/s) / (1,000 kg) this<==way
Velocity of the cannon = 2 m/s this<==way
how are the magnets able to have zero resistance
Magnets can have zero resistance due to the properties of superconductors. These materials exhibit zero electrical resistance and perfect diamagnetism at very low temperatures, a phenomenon known as the Meissner effect. Consequently, the magnetic field within a superconductor is zero, and once a current is established, it will persist without any applied voltage source.
Explanation:Magnets are capable of having zero resistance due to the properties of superconductors. Superconductors exhibit zero electrical resistance and perfect diamagnetism when cooled down to very low critical temperatures. This expulsion of all magnetic fields results in a net magnetic field of zero within the superconductor, even in the presence of an applied magnetic field, known as the Meissner effect.
An interesting consequence of this zero resistance is that once a current is established in a superconductor, it will persist without any applied voltage source. Furthermore, with a magnetic object, each surface you can imagine that encloses all or part of the magnet ultimately has zero net flux of magnetic field lines flowing through the surface. Just as many outward-flowing lines from the magnet's north pole pass through the surface as inward-flowing lines from the south pole of the magnet.
In superconductors, resistance disappearing is not the only intriguing phenomenon. The exclusion of magnetic fields, which is another manifestation of the Meissner effect, occurs as well. The forces on these currents tend to cancel, making the magnetic drag almost zero.
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Superconductivity, a state achieved at very low temperatures, allows magnets to have zero resistance and to expel all magnetic fields - a phenomenon known as the Meissner effect. In this state, a current persists without a needed voltage source. This property has practical applications such as in the technology used to levitate high-speed trains.
Explanation:In order for magnets to have zero resistance, they have to achieve a state known as superconductivity. Superconductivity is a phenomenon that occurs in some materials when they are cooled to very low critical temperatures. In this state, there is a resistance of exactly zero and all magnetic fields are expelled. This lack of resistance means that, once a current is established in a superconductor, it persists without an applied voltage source.
This is closely linked to something known as the Meissner effect, whereby superconductors expel all magnetic field lines. This perfect diamagnetism means that the net magnetic field within a superconductor is always zero — any magnetic field lines that pass through a superconducting sample when it is in its normal state are expelled once the sample becomes superconducting.
The practical applications of these properties are considerable. For instance, high-speed trains have been developed that levitate on strong superconducting magnets, exploiting the fact that a light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor.
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The center on a high school basketball team wants to increase the maximum height of his jump. What statement correctly describes how he could achieve this goal?
Jumping with more acceleration
Answer:
Explanation:
D) Jumping with greater initial velocity would increase the height of his jump.
If the bond enthalpy for a C-H bond is 413 kJ, what will happen when the C-H bond is broken?
Explanation:
Bond Enthalpy : It is defined as amount of energy required to break a the particular bond in there gaseous state. It is also known as bond energy. It units are kJ/mol.
Breaking of a bond is an Endothermic process (energy absorbed from the surroundings).Formation of bond is an Exothermic process (energy is released to the surroundings).If the average bond enthalpy for a C-H bond is 413 kJ/mol, When the C-H bond breaks in which energy will be required ,which will be an endothermic reaction.
A U-shaped valley is most often formed by
A. volcanoes
B. oceans waves
C. plate movement
D. glacial movement
formed by the process of glaciation.
A spring, when compressed 0.20 m from the equilibrium position, stores 24 J. What is the value of the spring constant
Given that:
spring compressed ( x) = 0.2 m
Work (W) = 24 J
determine , spring constant (x)=?
We know hat ,
Work (W) = (1/2). k.x²
24 = 1/2 ( k × 0.2²)
48 = k × 0.2²
k = 1200 N/m
In order to determine the velocity, you must know the distance and the time. the direction and speed. the time and speed. the direction and time.
In order to determine the velocity, you must know the direction and speed option (2) the direction and speed is correct.
What is the distance?Distance is a measurement of the separation between two things or places. When we talk about distance, we're talking about a physical length or an estimate based on other physics or practical usage factors.
It is given that:
In order to determine the velocity, you must know:
The options are:
The distance and the timeThe direction and speed. The time and speed. The direction and time.As we know,
A vector quantity is a velocity. It is characterized as a movement per instant.
Distance in a specific direction is known as dispersion, when an entity travels in a certain direction, such straight line, velocity can also be related to speed.
Thus, in order to determine the velocity, you must know the direction and speed option (2) the direction and speed is correct.
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What is the average velocity of a car that travels 50 kilometers due west in 0.50 hour?
Average Velocity= displacement/time Av=50/0.50 Av=100
Which of the following shows a car that is increasing in speed
energy from fast moving particles that will produce heat is
Thermal energy comes from moving particles
By making particles go faster, you increase the kinetic energy creating heat.
a person using a machine applies a force of 100 newton's over a distance of 10 Meters to raise a 500 n object 1.5 meters what is the work input?
Answer:
Work done by the machine (W) = 500 × 1.5 = 750 J
Work supplied to the machine (W) = 100 × 10 = 1000 J
Here, work supplied to the machine is input work = 1000 J
An object with more mass has more kinetic energy than an object with less mass, if both objects are moving ____.
Select one:
a. in the same direction
b. in the opposite direction
c. at the same speed
An object with more mass has more kinetic energy than an object with less mass, if both objects are moving at the same speed. (c)
Answer:
c. at the same speed
Explanation:
If a gas has a gage pressure or 156 kPa, it’s absolute pressure is approximately
A. 56 kPa.
B. 100 kPa.
C. 256 kPa.
D. 300 kPa.
Answer: C
Gauge pressure = 156 kPa ,
What is absolute pressure =?
We know that,
absolute pressure = gauge pressure + atmospheric pressure
Pabs = Pgauge + Patm
= 156 + 101.3 (since atm.pr. = 101.3 Kpa)
= 257.3 KPa absoulte
approximately = 256 KPa absolue
Which cools faster, land or water? Give a suitable reason for your answer.
Answer: Land cools faster than water
Reason: Water has high specific heat capacity, so it absorbs huge amount of heat energy to increase comparatively small amount of temperature. Loosing a large amount of heat requires more time, so water takes more time to cool down.
How much force is needed to accelerate a 1,800kg car at rate of 1.5 m/s2?
Given data:
acceleration (a) = 1.5 m/s² ,
mass (m) = 1800 Kg ,
Determine F = ?
From Newtons II law
F = m.a N
= 1800× 1.5
= 2700 N
2700 N force needed to accelerate the car
Answer: 2700 N force needed to accelerate the car
Explanation:
F = m.a N
= 1800× 1.5
= 2700 N
Density (D) is defined by mass/volume . Which item decreases as heat is applied?
V
D
M
Answer;
density = (mass/volume)
here density varies with respect to change in volume by assuming constant volume.
changing the temperature, change in density. most matter increases in volume when it gets hotter. Example, when an iron rod is heated, it will get longer and its density will decrease. This happens because the mass of the rod constant, but volume increase.
What is the role of the midbrain, and which part of the midbrain is important for arousing the forebrain?
Answer:
The fore-brain consists of the cerebrum, thalamus, and hypothalamus. Mid-brain relays information between fore-brain and hind-brain. Mid-brain plays important role in developing motor functions like eye movement, auditory functions and visual processing. The crus cerebri connects the cerebral hemispheres to the cerebellum, contains a portion having a network of neurons that is responsible for arousal and alertness.
You hear the engine roaring on a race car at the starting line.Predict the changes in sound as the race starts and approaches the camera
A.the sound of the engine will get louder and pitch lower
B.the sound of the engine will get louder and pitch higher
C.the sound is determined by the car and it will not change in anyway
D.the sound of an engine will get louder but the pitch will not change
The answer is B because if you seen a movie you would see it happen
The change in the car engine's sound as it approaches the camera can be explained by the Doppler Effect. The sound will get louder, and the pitch will get higher.
Explanation:This question pertains to the Doppler effect observed in sound waves. When a race car starts its engines, the sound of the car's engine roaring is heard at a certain pitch. As the car begins to move towards you, the source of the sound gets closer and the waves reach your ear more frequently. This translates into our perception as a higher pitch. So, the correct answer is B. The sound of the engine will get louder and pitch higher as the car approaches the camera.
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Plz help i need this is due in 45 mins ty
Figure 1
Speed is a scalar quantity, It has only magnitude but no direction. It is defined as rate of change of distance.
Mathematically, speed = distance÷time
S = d ÷ t
S = 2560 ÷ 60
S = 42.67 m/s.
Bits:
Speed is a scalar quantity, that describes only the magnitude (42.67 m/s) of the rate of change of an objects distance. Determine the objects speed requires a unit of distance per unit of time
Figure 2
Velocity is a vector quantity, It has both magnitude and direction. It is defined as rate of change of displacement.
Mathematically, Velocity = Displacement ÷ time
V = 75 ÷ 1.5
V = 50 Km/h.
Velocity is a Vector quantity that describes both the magnitude and direction of the rate of change of objects displacement plus it describes its position. An objects overall change in position is known as its Displacement per unit time.
Which energy transformation takes place when a firecracker explodes
Answer: Chemical energy to kinetic energy, heat energy, sound energy and light energy.
Explanation: The crackers are made up of gunpowder which is a chemical substance. When this gunpowder powder burns it produces smoke and hot gases (generation of heat and light energy) which create high pressure inside the can and blows the can open, and make all the tiny particles of powder blow out and chemical energy is converted to kinetic energy.
It makes the air to push outward and when it collapses back, it leads to generation of sound. So the chemical energy stored in gunpowder gets converted to sound.
During what Era did Pangaea break apart? a. Cenozoic c. Mesozoic b. Precambrian d. Paleozoic
i think it's Precambrian
Which would BEST describes what occurs when a ball is thrown against a wall?
A) The ball will not bounce off the wall.
B) The ball hits the wall hard enough to bounce off of it.
C) The wall is stronger than the ball and neither exerts any forces.
D) The ball exerts a force on the wall and the wall exerts a force back.
When a ball is thrown against a wall, the ball exerts a force on the wall, and the wall exerts an equal force in the opposite direction back on the ball. (D)
Answer:
The ball exerts a force on the wall and the wall exerts a force back.
Explanation:
When a ball is thrown against a wall, the ball exerts a force on the wall and the wall exerts a force back. This is due to Newton's third law of motion. According to this law, every action have equal and opposite reaction and both action and reaction forces acts on different object.
In this case, when a ball is thrown against a wall, the wall exerts an equal force on the the ball but in opposite direction. It follows the newton's third law.
Hence, the correct option is (D).
During constructive interference two waves travel through the same medium and the effects of the first wave are ___ the effects of the second wave
Answer:
During constructive interference occurs at any location along the medium where two inferring waves are in the same direction. In this case both waves have upward displacement. Consequently the medium has an upward displacement has that is greater than the displacement of inferring pulses.
what is the deffination of "The spinning of Earth on its axis"
It takes Earth about 24 hours to rotate once on its axis. The movement of one object around another object is called revolution. ... Earth's path as it revolves around the sun is called its orbit. Earth's orbit is a slightly elongated circle, or ellipse.
An object with equal amounts of positive and negative charge is called ______
An object with equal amounts of positive and negative charge is called neutral object.
What is electric charge?"Electric Charge is a property of subatomic particles that causes them to experience a force when they are placed in an electric and magnetic field." Positive and negative electric charges are commonly carried by charge carriers protons and electrons.
A scalar quantity is an electric charge. A vector quantity, in addition to having a magnitude and a direction, must also obey the laws of vector addition, such as the triangle law of vector addition and the parallelogram law of vector addition; only then is the quantity said to be a vector quantity.
Subatomic particles or matter particles are examples of charge types:
Protons have a positive charge.Electrons have a negative charge.Neutrons carry no charge.Any object with equal amounts of positive and negative charge is called neutral object.
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Which statement illustrates Newton's first law? Select one: a. A stone will not move unless something pushes or pulls it. b. A ball rolling across the floor eventually slows down. c. As a car comes to a stop, the passengers continue to move forward. d. All of the above
Answer: d, All of the above.
It states that "Every object will remain at rest or uniform motion unless compelled to change its state by the action of an external force".
All the choices a, b, c and d are explaining the newtons I law and proving above statement.
Explain How you can determine if a chemical reaction represents a single displacement reaction or a double displacement reaction
To determine if a chemical reaction represents a single displacement reaction or a double displacement reaction, examine the reactants and products. Single displacement reactions involve the replacement of an element in a compound, while double displacement reactions involve the exchange of ions between two compounds.
Explanation:In order to determine if a chemical reaction represents a single displacement reaction or a double displacement reaction, you need to examine the reactants and products in the reaction equation.
For a single displacement reaction, one element is replaced by another element in a compound. This can occur when a more reactive element displaces a less reactive element. An example of a single displacement reaction is the reaction between zinc metal and hydrochloric acid:
Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
On the other hand, a double displacement reaction involves the exchange of ions between two compounds. This can result in the formation of a precipitate or a gas. An example of a double displacement reaction is the reaction between sodium sulfate and barium chloride:
Na2SO4(aq) + BaCl2(aq) → 2NaCl(aq) + BaSO4(s)
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Question 4(Multiple Choice Worth 2 points)
The amount of power has decreased. This is most likely the result of
less work being done over a longer period of time.
less work being done over a shorter period of time.
the same amount of work being done over a longer period of time.
the same amount of work being done over a shorter period of time.
Number 1 is correct.
The amount of power has decreased. This is most likely the result of
A. less work being done over a longer period of time.
What happens to the force when time is reduced?Power is defined as work divided by time, or P = W / t. Therefore, as work increases and time decreases power increases.
Performance is the speed at which work is completed. The rate in this case means per unit time. Performance is calculated by dividing the work done by the time it takes to complete the work.
As already mentioned, performance is the speed of work. Therefore, it can be calculated by dividing the work done by the time. The formula for power is: Where P is the power, W is the work done, and t is the time required.
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A net force acts on a mass of 8.00 kg causing it to move from rest to a speed of 10.0 m/s in a time of 5.00 s. The bet force must have a magnitude of
A.8.00n
B.16.0n
C.40.0n
D.80.0n
Given data
mass (m) =8 Kg ,
speed (v) =10 m/s ,
time (t) = 5 s
determine magnitude of force (Fnet) = ?
we knoe that
Fnet = m.a
= 8 × (v/t) since a = v/t
= 8 × (10/5)
= 16 N
Magnitude of net force is 16 N