whats this symbol?
∑
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Please help in these 4 questions
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Answer:
See the answers below.
Explanation:
1
The data of 100W means power, and the other data of 220V means voltage, that is to say that bulb serves to work at a voltage of 220V100W datum means power.
J means work that is given in Joules [J], we must remember that power is defined as the relationship between work at a certain time, therefore we can determine work by means of the following expression.
\(P=W/t\\\)
where:
P = power [Watt]
W = work [J]
t = time [s]
\(W=P*t\\W=100*5[hr]*[\frac{3600s}{1hr} ]\\W=1800000[J] = 1.8[MJ]\)
Now the electric cost.
\(0.1[kW]*5[hr]*55\frac{LL}{1kwhr} =27.5[LL]\)
2
We know that power is defined as the product of voltage by resistance.
\(P=V*I\)
where:
P = power [W]
V = voltage [V]
I = current [amp]
\(I=P/V\\I=1500/220\\I=6.82[amp]\)
3
The voltage can be calculated by means of ohm's law, which tells us that the voltage is equal to the product of resistance by the current.
\(V =I*R\)
where:
V = voltage [V]
I = current = 20 [mA] = 0.02 [A]
R = resistance = 20 [kΩ] = 20000 [Ω]
Now replacing:
\(V = 0.02*20000\\V = 400 [V]\)
4
According to the figure we see that when the current is equal to 10 [mA] the voltage is equal to 1 [V]. With these two values, we can use ohm's law and find the value for the resistance.
\(V = I*R\\R = V/I\\R = 1/0.01\\R =100 [ohm]\)
a fragment of bone is discovered during an archaeological dig. the bone contains carbon-14 isotopes of the element carbon. the bone is approximately 23000 years old. calculate what proportion of the carbon-14 isotopes remains. give your answer to the nearest whole fraction. the half life of carbon-14 is 5730 years.
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When a fragment of bone containing carbon-14 isotopes of the element carbon is discovered during an archaeological dig, and it is estimated to be approximately 23,000 years old, one can calculate the proportion of the carbon-14 isotopes that remains.
The half-life of carbon-14 is 5,730 years. Carbon-14 has a half-life of 5,730 years, which implies that half of the carbon-14 atoms will decay every 5,730 years. This property of carbon-14 may be used to determine the age of ancient artefacts and fossils. By determining the proportion of carbon-14 remaining in a sample, we may determine how old it is.According to the problem, the bone is around 23,000 years old. We can utilize the following formula to calculate the proportion of carbon-14 isotopes that remain: Proportion remaining = (1/2)^(number of half-lives)We can first calculate the number of half-lives that have occurred since the bone was alive. The number of half-lives is calculated as follows:Number of half-lives = (time elapsed) / (half-life)Number of half-lives = 23,000 / 5,730Number of half-lives = 4.016So the number of half-lives that have occurred since the bone was alive is 4.016. We can now use this number to calculate the proportion of carbon-14 isotopes that remains:Proportion remaining = (1/2)^(4.016)Proportion remaining = 0.105Therefore, the proportion of carbon-14 isotopes that remains is 0.105, or approximately 1/10 (to the nearest whole fraction).For such more question on Proportion
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A 600-kg car is moving at 5 m/s then comes to a stop
in 3 seconds. How much average force is necessary?
Answers
The average force acting on the car is 1000 N.
What is force?The definition of force in physics is: The push or pull on a massed object changes its velocity. An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude.
Given that: A 600-kg car is moving at 5 m/s then comes to a stop in 3 seconds.
Now according to Newton's 2nd law of motion:
Magnitude of force applied on the body = change in momentum/time interval
= I final momentum - initial momentum I/time interval
= I 0 - 600×5 I /3 N
= 10000 N
Hence, average force acting on the car is 1000 N.
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summarize how many methods can be used to determine the index of refraction of an optical material
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Accurate determination of the index of refraction is important for many applications in optics and photonics, including lens design, fiber optics, and semiconductor processing.
There are several methods that can be used to determine the index of refraction of an optical material. One common method is to use a spectrometer to measure the angle of refraction as light passes through the material at various wavelengths. Another method involves measuring the critical angle at which total internal reflection occurs, which can be used to calculate the index of refraction. A third method is to use a prism to separate the different wavelengths of light and measure the angle at which each color is refracted. Other techniques include ellipsometry, interferometry, and polarimetry.
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Given 1 inch ≡ 2.54 cm and 1 foot ≡
12 inches, how many square centimeters are
in 3.22 ft2
?
Answers
Answer:
2991.47 [cm^2]
Explanation:
To solve this problem we must perform a dimensional analysis and use the corresponding conversion values:
\(3.22[ft^{2}]*\frac{12^{2}in^{2} }{1^{2}ft^{2}} *\frac{2.54^{2}cm^{2} }{1^{2}in^{2} } \\2991.47[cm^{2}]\)
Two Carnot air conditioners, A and B, are removing heat from different rooms. The outside temperature is the same for both rooms, 314 K. The room serviced by unit A is kept at a temperature of 292 K, while the room serviced by unit B is kept at 298 K. The heat removed from either room is 4430 J. For both units, find (a), (b) the magnitude of the work required and (c), (d) the magnitude of the heat deposited outside for A and B conditioners respectively
Answers
Answer:
(a) 333.77 J
(b) 237.85 J
(c) 4763.77 J
(d) 4667.85 J
Explanation:
Temperature of source, TH = 314 K
Temperature of A, Tc = 292 K
Temperature of B, Tc' = 298 K
heat taken out, Qc = 4430 J
Let the heat deposited outside is QH and QH' by A and B respectively.
\(\frac{Q_H}{Q_c}=\frac{T_H}{T_c}\\\\Q_H = \frac{4430\times314}{292}=4763.77 J\)
Now
\(\frac{Q_H'}{Q_c}=\frac{T_H}{T_c'}\\\\Q_H' = \frac{4430\times314}{298}=4667.85 J\)
(a) Work done for A
W = QH - QC = 4763.77 - 4430 = 333.77 J
(b) Work done for B
W' = QH' - Qc = 4667.85 - 4430 = 237.85 J
(c) QH = 4763.77 J
(d) QH' = 4667.85 J
Is the force of friction related to the weight of the shoe? Explain
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A 710 kg k g car drives at a constant speed of 23 m/s m / s. It is subject to a drag force of 500 n n.
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A 710 kg k g car drives at a constant speed of 23 m/s and is subject to a drag force of 500 N. The required power to drive the car on the ground is 11.5 kW
Power is defined as the amount of work done per unit time.
P = W/Δt
Where:
W = work done
Δt = time period
Since W = F . s
Hence,
P = F . s/Δt = F . v
Where:
F = force acted on the object
s = distance
v = velocity
Parameters given in the problem:
F = 500 N
v = 23 m/s
Hence, the required power is:
P = (500) (23 ) = 11,500 Watt = 11.5 kW
Your question is incomplete, but most probably your question was:
A 710kg car drives at a constant speed of 23m/s . It is subject to a drag force of 500 N. What power is required from the car's engine to drive the car on level ground?
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a stone is dropped into a well. the sound of the splash is heard 3.00 s later. what is the depth of the well?
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A stone is dropped into a well. the sound of the splash is heard 3.00 s later. The depth of the well is: 510 m
A stone is dropped into a well and the sound of the splash is heard 3.00 s later. To calculate the depth of the well, we can use the equation :
Depth = (Speed of sound x Time taken)/2
where the Speed of sound is 340 m/s. Therefore, the depth of the well is calculated to be 510 m.
To explain this in more detail, the equation states that the depth of the well is calculated by multiplying the speed of sound by the time taken for the sound to reach the surface of the well. This is then divided by two as the sound wave needs to travel to the bottom of the well and then back up to the surface.
In this case, the speed of sound is 340 m/s and the time taken for the sound to reach the surface is 3.00 s, so the depth of the well is 510 m.
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Explain a principal of moments of a force
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The principle of moments states that when a body is balanced the total clockwise moment about a point equals the total anticlockwise moment about the same point.Equation.Moment=Force F×perpendicular distance from the pivot do.
III. Directions: Write TRUE if the statement is correct if FALSE change the incorrect underline word. Write your answers on a separate answer sheet of paper. 1. The night- vision goggles make use of microwave. 2. Infrared remote controls are used in TV, video, cassette recorders and other electronic appliances. 3. Radio waves are used in in communication devices, car locking system and computers. 4. Microwaves are reflected in many directions by the fan and the walls of the microwave oven during baking of or cooking of food. 5. Radio waves scanners are used to show the temperature variation of the body. This can be used for medical diagnosis.
Answers
infrared
true
infrared
true
infrared
. a stone of mass m is thrown upward at a 30o angle to the horizontal. at the instant the stone reaches its highest point, why is the stone neither gaining nor losing speed? (pick one) a) because the acceleration of the stone at that instant is 0; b) because the net force acting upon the stone at that instant has magnitude mg; c) because the angle between the stone’s velocity and the net force exerted upon the stone is 90o; d) because the stone follows a parabolic trajectory and th peak of the trajectory is where the parabola has zero slope.
Answers
When the stone reaches its highest point, it is neither gaining nor losing speed because the acceleration of the stone at that instant is 0.
At the highest point of its trajectory, the stone momentarily stops and changes direction, going from moving upward to moving downward. The acceleration is the rate of change of velocity, and at this point, the velocity is changing from upward to downward. Since the stone is changing direction, the velocity is changing, but the speed remains constant. This means that the stone's acceleration is 0, and therefore it is neither gaining nor losing speed.
In this situation, the net force acting upon the stone is still equal to its weight, mg. However, this is not the reason why the stone is neither gaining nor losing speed. The stone's velocity and the net force exerted upon the stone are not at a 90-degree angle, so option (c) is incorrect.
The statement about the stone following a parabolic trajectory and the peak of the trajectory having zero slope is true, but it does not explain why the stone is neither gaining nor losing speed at the highest point.
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Question 1 of 14 Which of the following statements describes a perfectly inelastic collision? O A. An ice hockey player picks up a trophy as he slides past it. O B. A baseball bat hits a baseball into the outfield. O C. A surfer falls off of his surfboard when a wave hits him. D. Two birds collide in midair and fly off in different directions.
Answers
Answer: A. An ice hockey player picks up a trophy as he slides past it
Explanation:
A PE X
The statement that best describes a perfectly inelastic collision is
C. A surfer falls off of his surfboard when a wave hits him.
What is collision?A collision is the interaction between two bodies in such a way that the momentum and velocity of one body gets changed due to the presence of other body. There are three types of collision-
1. Elastic collision
2. Inelastic collision
3. Perfectly inelastic collision.
In all types of collision , the momentum of the system before collision and after collision always remains same or we can say that momentum is conserved in collisions
What is elastic collisionAn elastic collision is the one in which kinetic energy is also conserved and coefficient of restitution is one. Both the bodies move separately with different velocities after elastic collision.
What is inelastic collision ?In inelastic collision there is a loss of kinetic energy and coefficient of restitution is less than one.
What is perfectly inelastic collision?In perfectly inelastic collision there is maximum loss of kinetic energy and coefficient of restitution is zero. Both the bodies stick together after collision and move with same velocity
What is coefficient of restitution ?Coefficient of restitution is the ratio of relative velocity of separation after collision to relative velocity of approach before collision.
A surfer falls of his surfboard when a wave hits him is an example of perfectly inelastic collision because in this when water hits the surfers he falls of and sticks to the water , and will also now move with the velocity of water .
So when the surfer falls off his surfboard when a wave hits him is perfectly inelastic collision.
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For each of the variables, make a hypothesis.
1. Egg Size: As I break. the size of the egg, it will be likely to the drop height, the egg will be
2. Drop height: As I likely to break. 3. Landing Surface: (write your own statement here, think about the surface and what might be important about it that would increase or decrease the likelihood that the egg will break)
There is a data table on the next page. Be sure to conduct your trials in an organized manner to allow for the data table to be of maximum use to you in answering the questions.
Answers
Answer:
Hope this helps :)
Explanation:
Let's start b writing down coordinates of all points:
A(0,0,0)
B(0,5,0)
C(3,5,0)
D(3,0,0)
E(3,0,4)
F(0,0,4)
G(0,5,4)
H(3,5,4)
a.) When we reflect over xz plane x and z coordinates stay same, y coordinate changes to same numerical value but opposite sign. Moving front-back is moving over x-axis, moving left-right is moving over y-axis, moving up-down is moving over z-axis.
A(0,0,0)
Reflecting
A(0,0,0)
B(0,5,0)
Reflecting
B(0,-5,0)
C(3,5,0)
Reflecting
C(3,-5,0)
D(3,0,0)
Reflecting
D(3,0,0)
b.)
A(0,0,0)
Moving
A(-2,-3,1)
B(0,-5,0)
Moving
B(-2,-8,1)
C(3,-5,0)
Moving
C(1,-8,1)
D(3,0,0)
Moving
D(1,-3,1)
Can mechanical waves travel in a vacuum?
O yes
O no
Answers
No mechanical waves cannot travel in a vacuum
If a 1,000-kg car is traveling at 20.0 m/s when it reaches the bottom of a circular hill of radius 8.00 m, what normal force does the road exert on the car at the bottom of the hill
Answers
Answer:
i don't know this one.
Explanation:
For the zero order reaction A→B+C, initial concentration of A is 0.1M. If A=0.08M after 10 minutes, it's half-life and completion time are respectively :
Answers
The rate of a zero-order reaction is constant and independent of the concentration of the reactant force. The half-life for zero-order reactions is inversely proportional to the initial concentration of the reactant.
The equation for the zero-order reaction is as follows:A → B + Cwhere A is the reactant, and B and C are the products.The half-life of a zero-order reaction is given by the formula: Half-life t1/2= [A]0/2kWhere [A]0 is the initial concentration of A, k is the rate constant of the reaction.
The half-life of a zero-order reaction is inversely proportional to the initial concentration of the reactant, and it is independent of the concentration of the reactant. The completion time is the time it takes for the reaction to be complete.
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Why is an astronical unit used to measure distances in the solar system?
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In our solar system, distances are really great. Therefore, astronomers frequently avoid using miles or kilometers when describing the distances to planets, asteroids, comets, or spacecraft.
What is astronomical unit?They substitute astronomical units, or AU, which represent the typical separation of the Earth from the sun. That translates to around 93 million miles, 150 million kilometers, or 8 light-minutes.
It is simpler to visualize relative distances in space when thinking in terms of astronomical units. An astronomical unit is 92,955,807 miles in exact distance (149,597,871 km).
The orbit of the Earth around the sun is not a complete circle. Consequently, during the year, Earth's distance from the sun varies. Earth is approximately 0.983 AU from the sun when it is at perihelion, which occurs in January.
Therefore, In our solar system, distances are really great. Therefore, astronomers frequently avoid using miles or kilometers when describing the distances to planets, asteroids, comets, or spacecraft.
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2. Write five honest ways of earning money.?
Answers
Answer:
Get Hired
Start a business
rent out your house
Sell online
Take surveys
Explanation:
Answer:
1 can be working with a family member and helping them with their work and earning money from that.
2 getting a job that fits your age limit.
3 doing chores around your home.
4 babysitting your siblings or family member and charging a decent fair price.
5 helping with pets or helping around outside
Explanation:
PLEASE HELP ASAP
A physics student is adjusting the settings of their projectile launcher. If the VX =28 m/s and the Vy = 15 m/s, what is the magnitude of its velocity?32 m/s
13 m/s
43 m/s
1009 m/s
Answers
Answer:
The first choice (32m/s) is the closest to the answer
Explanation:
The magnitude of a vector is the distance between the initial and the end point of the vector.
Being Vx and Vy the horizontal and vertical components of the vector V respectively, the magnitude of V is calculated as:
\(\mid \vec{V} \mid =\sqrt{V_x^2+V_y^2}\)
The components of the velocity of the physics student's projectile launcher are Vx=28 m/s and Vy=15 m/s.
Calculate the magnitude of the velocity:
\(\mid \vec{V} \mid =\sqrt{28^2+15^2}\)
\(\mid \vec{V} \mid =\sqrt{784+225}\)
\(\mid \vec{V} \mid =\sqrt{1009}\)
\(\mid \vec{V} \mid =31.8 \ m/s\)
The first choice (32m/s) is the closest to the answer
A 9 cm tall object is placed 16 cm from a converging lens forming an image at 13 cm. What is the height of the image?
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When the large forces are 12 N and the small forces are 4n and what is the total net force?
Answers
When the large forces are 12 N and the small forces are 4n then the total net force is 16 newtons.
What is the total net force?The net force is the resultant of all the forces; it is the result of adding all the forces together the greater the net force acting on the object, the greater its acceleration will be. Newton's second law of motion summarizes these relationships. The equation for net force can be written as
Net Force = F1 + F2 + F3…. + FN.
The net force is zero Newtons. All the separate forces balance with each other. Suppose you and your friends A and B are together pushing the cupboard from the same direction. Force applied by you is 5N, and your friend's A and B apply the force of 6N and 5N, respectively so the total force will be 11 newtons.
so we can conclude that When the large forces are 12 N and the small forces are 4n then the total net force is 16 newtons.
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when a conductor cuts magnetic lines of force a voltage is induced into the conductor this principle is called
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when a conductor cuts magnetic lines of force a voltage is induced into the conductor this principle is called Faraday's law of electromagnetic induction.
Faraday's law, named after the British physicist Michael Faraday, describes the relationship between a changing magnetic field and an induced electromotive force (EMF) in a conductor. According to the law, when a conductor is placed in a varying magnetic field, a voltage is induced across the ends of the conductor, creating an electric current.
Faraday's law is a fundamental principle of electromagnetism and is used to explain a wide range of phenomena, including the operation of electric generators, transformers, and motors. It also plays a crucial role in the understanding of electromagnetic induction, which is the process by which a changing magnetic field can create an electric field, and vice versa.
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To calculate the density of an object which of the following values do you need to know a. Buoyancy b. Volume c. Weight d. Mass
Answers
Answer: Volume and mass
Explanation: I took the quiz lol
A 20 kg projectile is fired at an angle of 60 degrees above the horizontal with a speed of 80.0 m/s. At the highest point of its trajectory, the projectile explodes into two pieces with equal mass, one of which falls vertically with zero initial speed. You can ignore air resistance.a) How far from the point of firing does the other fragment strike if terrain is level?b) How much energy is released during the explosion?
Answers
Thus, the energy released in the explosion is given by:
E = (20 kg) * (9.8 m/s2) * (483.3 m) = 96,276 J.
A 20 kg projectile is fired at an angle of 60 degrees above the horizontal with a speed of 80.0 m/s. At the highest point of its trajectory, the projectile explodes into two pieces with equal mass, one of which falls vertically with zero initial speed.
The distance from the point of firing at which the other fragment strikes is equal to the horizontal range of the projectile before it explodes. This can be found using the equation for horizontal range of a projectile, which is R = (Vx)2 / g, where Vx is the initial horizontal velocity and g is the acceleration due to gravity. Plugging in the given values, we get:
R = (80.0 m/s)2 / (9.8 m/s2) = 645.1 m.
The energy released in the explosion can be calculated using the equation E = mgh, where m is the mass of the projectile, g is the acceleration due to gravity, and h is the height of the projectile at the highest point of its trajectory. Since the height of the projectile can be found using kinematics equations, we get:
h = (Vy)2 / (2g), where Vy is the initial vertical velocity. Plugging in the given values, we get:
h = (80.0 m/s * sin 60o)2 / (2 * 9.8 m/s2) = 483.3 m
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What is the energy required to change the temperature of 1 kg of water from 27 oc to 77 oc? remember, that the specific heat 4186 j/kg c. answer only in numbers to the nearest whole number. what is the energy required to change the temperature of 1 kg of water from 27 oc to 77 oc? remember, that the specific heat 4186 j/kg c. answer only in numbers to the nearest whole number.
Answers
The energy required to change the temperature from 26°C to 64°C is 209300 J.
Heat is a form of energy that can be transferred from one object to another due to different temperatures.
The heat required to raise the temperature is expressed by the equation:
Q = m.c.ΔT
where,
Q: Heat (Joules)
m: mass (kg)
ΔT: temperature change (°C)
c: specific heat (J/kg C)
In the given question mass are 1 kg and the temperature change from 27°C to 77°C. (the specific heat is 4186 J/kg°C)
Q = m.c.ΔT
Q = 1 x 4186 x (77°C - 27°C)
Q = 4186 x 50°C
Q = 209300 J
So, the energy required to change the temperature is 209300 J.
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What is the law of inertia? Give an example of inertia in action.
Answers
Answer:
The law of inertia is another name for Newton's first law. Newton's first law states that an object will not change its motion or direction unless a force acts on it. An object at rest will stay at rest and an object in motion will stay in motion if there isn't any force acting on them.
Example: When a car uses its brakes to stop, you sometimes feel like you are sliding forward. That is because the inertia keeps you moving forward, even though the car stopped.
Explanation:
Answer:
Law of inertia is sometimes called Newtons First law of motion.
Newtons first law of motion states that"A body will continue to its state of rest or motion unless external force acted upon it.
Hello I don’t quite understand this question I could really use some help thank you! :)
Answers
The necessary to determine the amount of thermal energy applied to the water by the stove is option C. The initial temperature of the room, the initial mass of water, the specific heat of water, the latent heat of fusion of water, and the boiling point of water.
The latent heat of fusion, also known as enthalpy of fusion, is the quantity of strength that should be furnished to a solid substance (generally in the form of heat) so as to cause a trade in its bodily kingdom and convert it right into a liquid.
Thermal electricity refers to the energy contained inside a device that is chargeable for its temperature. heat is the go with the flow of thermal power. a whole branch of physics, thermodynamics, offers how heat is transferred between distinct systems and the way paintings is carried out inside the method (see the 1ˢᵗ regulation of thermodynamics.
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What are the measures of arc j k and ∠kij? measure of arc j k = ° measure of ∠kij = °
Answers
The measure of arc JK is calculated to be 104° and the measure of ∠KIJ is calculated to be 52°.
It is given that ∠JKI is 70°, arc KI is 116°.
We need to calculate the value of arc JK and angle ∠KJI.
An arc is, in general, any straight curve that connects two locations. The extent of an arc is referred to as arc length.
Since the arc KI = 116° has been provided, we can determine the KJI using the intercept characteristic.
∠KJI = arc KI/ 2
Putting the values in the formula we obtain ∠KJI = 116°/2
⇒ ∠KJI = 58°
By the angle sum property of a triangle, we can write ∠K +∠I +∠J = 180°
⇒ 70° + I + 58° = 180°
⇒ I = 52°
We obtain arc KJ by applying the intercept formula,
∠JIK = arc JK/ 2
⇒ 2 (∠JIK) = arc JK
⇒ 2 (52°) = arc JK
⇒ arc JK = 104°
Therefore, the measure of arc JK = 104° and the measure of ∠KIJ = 52°.
The given question is incomplete. The complete question is 'A circle is shown. Triangle J K I have points on the circle. Angle J K I is 70 degrees. The measure of arc K I is 116 degrees. What are the measures of Arc J K and ∠KIJ? Measure of Arc J K = °. Measure of ∠KIJ = °.
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Two figure skaters, one weighing 625 N and the other 725 N, push off against each other on frictionless ice. If the heavier skater travels at 1.5 m/s, how fast will the lighter one travel?
Answers
The lighter one travel with the speed of 0.574 m/sec. Force is defined as the product of mass and acceleration. Its unit is Newton.
What is force?Force is defined as the push or pull applied to the body. Sometimes it is used to change the shape, size, and direction of the body.
The two skaters push off against each other on frictionless ice, then torque act by the one skater on the other is equal.
P₁₂=P₂₁
F₁₂V₁ =F₂₁V₂
625 ×V₁= 725 N× 1.5 m/s
V₁=0.574 m/sec
Hence, the lighter one travel with the speed of 0.574 m/sec.
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Answer:
1.74 m/s
Explanation:
use the formula
\(F_{1} v_{1} = F_{2}v_{2}\)
the heavier skater being \(F_{1}\) and the lighter skater being \(F_{2}\)
(725 N)(1.5 m/s) = (625 N) \(v_{2}\)
solve for \(v_{2}\)
\(v_{2} =\) 1.74 m/s