Answer: it is A
Explanation: A p e c
The mass of water in the kettle is 0.50 kg. The specific heat capacity of water is 4200 J/kg °C. The initial temperature of the water is 100 °C. Calculate the average power output from the water in the kettle to the surroundings in 2 hours
Answer:
1.27 Mega watt approx
Explanation:
Given data
Mass= 0.5kg
c= 4200 J/kg °C
T1= 100°C
Time = 2 hours >>>> 7200 seconds
From the given data the water is already at the boiling point
Hence if continuous heat is being added the latent heat of vapourization will result, the latent heat of vaporization is about 2,260 kJ/kg
Q= mL
Q= 0.5*2,260
Q = 1130kJ
Power= Energy * Time
Power= 1130* 1130
Power= 1.27mega watt approx
What is the current that reverses direction in a regular patter called
Answer:
Current that reverses direction in the regular pattern is called an alternating current, abbreviated as 'AC'.
Explanation:
hope this helps!
which event involves throwing a spherical weight from the shoulder?
a. discus throw
b. hammer throw
c. shot put
Answer:
c. shot put
Explanation:
cause the shot is a ball
Need help as fast as possible please
I will mark BRAINLIST only for correct answers babes :)
Thank you!
Answer:1. true
2false
Explanation:
A nswer:
1) false
2) true
Hope its true ! btw its gogole forms right :)
Agatha has 1kg samples of two substance- A and B. Substance A has a higher specific heat capacity than substance B. Both samples cool down by 10C. Which will release more heat - A or B
Answer:
Substance A will release more heat.
Explanation:
Let suppose that both substances experiment an entirely sensible heat process and are incompressible and begin at the same temperature. Physically speaking, specific heat ([tex]c[/tex]), measured in kilojoules per kilogram-degree Celsius, can be described by following expression:
[tex]c = \frac{Q}{m\cdot (T_{f}-T_{o})}[/tex] (1)
Where:
[tex]Q[/tex] - Released heat, measured in kilojoules.
[tex]m[/tex] - Sample mass, measured in kilograms.
[tex]T_{o}[/tex], [tex]T_{f}[/tex] - Initial and final temperatures of the sample, measured in degrees Celsius.
If we know that [tex]c_{A}> c_{B}[/tex], [tex]m_{A} = m_{B}[/tex], [tex]T_{A,o} = T_{B,o}[/tex] and [tex]T_{A,f} = T_{B,f}[/tex], then we have the following inequation:
[tex]\frac{Q_{A}}{m\cdot (T_{A,f}-T_{A,o})} > \frac{Q_{B}}{m\cdot (T_{B,f}-T_{B,o})}[/tex]
[tex]Q_{A} > Q_{B}[/tex]
Substance A will release more heat.
2. A compressed gas is held inside a canister with a moveable lid. The temperature of the gas is significantly
higher than the air temperature outside the canister. When weight is removed from the lid, the gas
expands to lift it. For this expansion to be as nearly adiabatic as possible, which condition should be met?
Answer:
Heat supplied should be equal to zero.
Explanation:
Given that a compressed gas is held inside a canister with a moveable lid. The temperature of the gas is significantly higher than the air temperature outside the canister. When weight is removed from the lid, the gas
expands to lift it.
For this expansion to be as nearly adiabatic as possible, one of the conditions that should be met is that there should be no supply of thermal or heat energy to the system.
According to first law of thermodynamics:
Change in internal energy = heat supply + work done by the system
If heat supplied = 0
Then, nothing is constant.
The internal energy = work done by the system.
Therefore, no heat should be supplied to the system.
Put the following objects in order of increasing momentum: a parked car, a train moving at 50 km/h, a train moving at 80 km/h, a car moving at 50 km/h.
Answer:
1.parked car 2.car moving 50 km/h 3.train moving at 50 km\h 4.train moving at 80km\h
1.parked car 2.car moving 50 km/h 3.train moving at 50 km\h 4.train moving at 80 km\h is increasing momentum order.
What is momentum?
In Newtonian mechanics, momentum is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction. If m is an object's mass and v is its velocity, P = mv.
The total momentum experienced by the object depends on the force acting on it. The momentum remains unchanged in the absence of external forces.
1.parked car 2.car moving 50 km/h 3.train moving at 50 km\h 4.train moving at 80 km\h is increasing momentum order.
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please help me guys please please please
Answer:
Mass = 2154 grams
Explanation:
Given the following data;
Acceleration = 520m/s²
Force = 11.2N
To find the mass;
Force = mass * acceleration
Mass = force/acceleration
Substituting into the equation, we have;
Mass = 11.2/520
Mass = 2.154 kg
Therefore, the value of mass in grams;
1000 grams = 1 kilograms
x grams = 2.154 kilograms
Cross-multiplying, we have;
2.154 * 1000 = 2154 grams.
Mass = 2154 grams.
Therefore, the mass of the model rocket is equal to 2154 grams.
Which action could a student take to produce a longitudinal wave with a large amplitude?
A. Stand still as possible
B. Light a candle
C. Bang on a drum
D. Drop a pebble in a pond
Answer:
Explanation:
A
Answer:
C - Bang on a drum
Explanation:
Can someone help me with this answer the question pls don’t guess and actually help me I’ll give brainliest
Answer: clastic sedimentary rock
Explanation: Hope this helps!
Hypochondriacs seek out medical care in order to verify that they do not have an illness.
Please select the best answer from the choices provided
T
F
Answer:
False
Explanation:
Just took the test
False, because hypochondriacs think they have a significant, undetected medical ailment even when testing reveal they are healthy.
Who are hypochondriacs?A hypochondriac is someone who, despite diagnostic testing showing they have no health issues, lives in constant anxiety that they have a terrible, undetected medical illness. They are obsessed with the concept that they suffer from a major illness that has gone untreated.
In adults, hypochondriasis often begins to manifest. Among the symptoms are a persistent, strong anxiety of developing a major illness and concern that seemingly little symptoms portend a larger problem. A patient may change physicians or see them regularly.
Medication and counselling could be helpful.
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If you were in charge of designing a wire to carry electricity across your city, state or province, which of
the following properties would be most important for your wire to have?
Should it be thick or thin, aluminum or nichrome, buried underground or installed out in the sun
Pleaseeee I need this done I beg Ill give brainiest and make sure its at least on paragraph if not then at least as many sentences as you can please
Answer:
Thin, aluminium and buried underground.
Explanation:
When it comes to electrification of a state or province, some characteristics of the wire to use must be considered. This would help to minimize and avoid power loss and wire burns.
i. The wire to use should be thin, and a quite number can be twisted one against the other so as to increase the surface area for heat dissipation.
ii. Aluminium wire is more preferable for this project. It has a high melting point, and reduces energy loss.
iii. Burying the wire underground through an insulator is the best choice, though expensive but would preserve the wire from external influence.
The difference between a Scalar quantity and a Vector quantity?
Answer:
A quantity that has magnitude but no particular direction is described as scalar. A quantity that has magnitude and acts in a particular direction is described as vector.
PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
I can help with the last question.
Explanation:
The force from the ball on the left ball will hit the ball next to it, bringing the force all the way to the right ball, and vice versa. Have a great day!
Answer:
gravity is pulls objects to the center of the earth.
friction is slows or stops motion when objects rub together.
magnetism is pushes or pulls objects containing iron or other metals.
Consider the four masses. Describe the motion of the masses if you used THE SAME amount of force to move each one over THE
SAME time
A)
The greatest mass would not move at all.
B)
All four masses would move the same distance,
The lower the mass, the greater the distance the mass would move,
D)
The greater the mass, the greater the distance the mass would move,
Answer:
option c...................
How much voltage would it take to push 0.5 amps through a 2 kilowatt toaster?
1000 Volts
2000 Volts
3000 Volts
4000 Volts
5000 Volts
6000 Volts
Given :
Current, I = 0.5 A.
Power of toaster, P = 2 kW = 2000 W.
To Find :
How much voltage is required.
Solution :
We know, voltage is given by :
[tex]V = \dfrac{P}{I}\\\\V = \dfrac{2000\ W}{0.5 A}\\\\V = 4000 \ volts[/tex]
Therefore, 4000 Volts are required.
Answer:
4000
Explanation:
2000/0.5=4000
Why must 0s always be clearly marked on a motion map?
Answer:
A motion map can represent the position, velocity, and acceleration of an object at various clock readings. ... The corresponding motion map has the points spaced farther apart (because the car would go a further distance in each second), and the velocity vectors (arrows) are longer, because the car is moving faster.
Explanation:
1. A plane mirror has a
surface
Answer:
A plane mirror is a mirror with a flat (planar) reflective surface. For light rays striking a plane mirror, the angle of reflection equals the angle of incidence. The angle of the incidence is the angle between the incident ray and the surface normal (an imaginary line perpendicular to the surface).
If one soccer ball is rolling to the right at 3 m/s and another soccer ball is rolling left with a speed of 5 m/s, how much momentum is there in this system before they collide with each other? Both have a mass of 1 KG
Answer:
Final momentum after a head on collision is -2kgm/
Explanation:
One ball moves to the right and the other moves opposite and momentum is a vector quantity so that considering the direction
Initial momenta are P₁=2x3=6kgm/s P₂=4x(-2)=-8kgm/s
Final momentum is the vector sum of P(final)= 6-8= -2 kgm/s
The net horizontal force on a box F as a function of the
horizontal position x is shown below.
Force (N)
40
20+
Position (m)
4
4
6
oc
10
12
14
-20+
-40
What is the work done on the box from x = 0m to
16 m?
Round answer to two significant digits.
J
Answer:
0J
Explanation:
Kahn academy approved
The Workdone is the product of force and distance, Hence, the Workdone on the box from distance x = 0 meters and x = 16 meters is 0 Joules.
Using the graph given :
The work done from x = 0 to x = 16 metres ;
The distance can be split evenly into :
(x = 0 to x = 8) and (x = 8 to x = 16)
Workdone = Force × distance
Workdone from ; x = 0 to x = 8 ;
Force at a distance of 8 meters = - 40N
Workdone = - 40N × 8 m = -320 Nm
Workdone from ; x = 8 to x = 16 ;
Force at a distance of 16 meters = 40 N
Workdone = 40 N × 8 m = 320 Nm
The total workdone :
(-320 + 320) Nm = 0 J
.
Therefore, the Workdone ls 0 Joules.
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What happens to the current in the other two lamps
if one lamp in a three-lamp parallel circuit burns out?
Answer:
If one of the filaments burns out, the resistance and the potential difference across the other lamps will not change; therefore, their currents will remain the same.
Explanation:
Answer:
кпукнгпееагегпаммршолипwhat is the name of the compound Cu(HCO3)2
Answer:
Copper(II) Hydrogen Carbonate Cu(HCO3)2 Molecular Weight
The name of the compound Cu(HCO₃)₂ is Copper (II) bicarbonate.
What is chemical compound?A chemical compound is a substance made of numerous similar molecules (or molecular entities) joined by chemical bonds and comprising atoms from various chemical elements.
Therefore, a molecule made up of only one type of atom is not a compound. Chemical reactions, which may entail interactions with other molecules, can change a compound into a distinct substance. Atomic bonds may be shattered or new ones created during this process.
Compounds can be divided into four main categories based on the bonds that hold their individual atoms together. Covalent bonds hold together molecules, ionic bonds hold together ions, metallic bonds hold together intermetallic compounds, and coordinate covalent bonds hold coordination complexes together.
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A balloon of hydrogen is put into to pressure chamber. The initial pressure and volume of hydrogen is 1 atm and .5 cm3. The pressure of the chamber is increased to 2 atm. What is the new volume? Use the formula for Boyle's Law: P1V1 = P2V2
Answer:
2.5 cm³
Explanation:
Use Boyle's Law
1×5=2×V
5=2V
V=5/2=2.5 cm³
why is there no reflection formed when light is absent?
Explanation:
Because there is no light to be reflected. Reflection is the process of bouncing back of the light but since there is no light then nothing will be reflected.
It is correct .
The light is not reflected by the mirror in a dark room due to which no image is formed.
What are shadows?A shadow is a dark area where light from a light source is blocked by an opaque object.It occupies all of the three - dimensional volume behind an object with light in front of it. The cross section of a shadow is a two - dimensional silhouette, or a reverse projection of the object blocking the lightGiven is that no reflection is formed when light is absent.
We will not see our reflection in mirror in a dark room because an image is formed only when the light gets reflected by the mirror whereas in a dark room, there is no light to cause reflection hence, no image will be formed
Therefore, the light is not reflected by the mirror in a dark room due to which no image is formed.
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Look at the diagram below. Which wave effect is being shown?
Enter your answer
Answer:
Where is the diagram????
Answer:
reflection
Explanation:
help!! HELP HELP HELP HELP
Answer:
if a red gaint star is large enough, it may eventually blow up in an explosion called a supernova leaving behind very dense neutron star.
A 127 N object vibrates with a period of 3.32 s when hanging from a spring. What is the spring constant of the spring? The acceleration of gravity is 9.81 m/s 2 . Answer in units of N/m.
Answer:
The spring constant is approximately 46.382 newtons per meter.
Explanation:
From Physics, the period ([tex]T[/tex]), measured in seconds, experimented by an object under Simple Harmonic Motion:
[tex]T = 2\pi\cdot \sqrt{\frac{W}{g\cdot k} }[/tex] (1)
Where:
[tex]W[/tex] - Weight, measured in newtons.
[tex]g[/tex] - Gravitational acceleration, measured in meters per square second.
[tex]k[/tex] - Spring constant, measured in newtons per meter.
If we know that [tex]W = 127\,N[/tex], [tex]g = 9.807\,\frac{m}{s^{2}}[/tex] and [tex]T = 3.32\,s[/tex], then the spring constant of the system is:
[tex]\frac{T^{2}}{4\cdot \pi^{2}} = \frac{W}{g\cdot k}[/tex]
[tex]k = \frac{4\cdot \pi^{2}\cdot W}{g\cdot T^{2}}[/tex]
[tex]k \approx 46.382\,\frac{N}{m}[/tex]
The spring constant is approximately 46.382 newtons per meter.
A car travels a total distance of 99 meters in 3 seconds. Calculate the average speed ? *
SOS HELP ME
Question #2
Solve for the maximum height of each of the numbers from your chart.
Answer:
Angle Vy Vy^2/(2*g)
25 6.3 2.02
30 7.5 2.87
45 10.6 5.73
50 11.5 6.75
65 13.6 9.44
70 14.1 10.1
Vy = vertical velocity = V sin theta
2 g H = Vy^2 since the final velocity is zero
H = Vy^2 / (2 * g)
How could you measure the strength of static electricity compared to the strength of an
electromagnet?
Answer:
Lines of Force around an ElectromagnetExplanation:
The magnetic field strength of an electromagnet is therefore determined by the ampere turns of the coil with the more turns of wire in the coil the greater will be the strength of the magnetic field