Answer:
It is launched with a speed of 11 m/s.
Explanation:
A lamp is labelled '230 V, 100 W'. How many joules of electrical energy is changed to thermal energy and light if the lamp is switched on for 2 hours?
Given;
V = 230V
Power, P = 100W
time, t = 2hrs = 7200s
from,
P = IV
and Energy, E= Pt
E = 100*7200
E = 720000 Joules
E = 720KJ
Answer:
Formula E(J) = P(W) × t(s)
3600 Seconds in an hour
7200 seconds in two hours.
watts = 100
100 x 7200 = 720000
Explanation:
Watts to joules calculation
The energy E in joules (J) is equal to the power P in watts (W), times the time period t in seconds (s):
E(J) = P(W) × t(s)
Energy cannot be created or destroyed, only converted from one form to another. These conversions can be shown in Sankey diagrams. Efficiency is a measure of how much useful energy is converted. Attachment 1
Modern energy-saving lamps and LEDs (light-emitting diodes) work in a different way. They transfer a greater proportion of electrical energy as light energy. Attachment 2
From the diagram, you can see that much less electrical energy is transferred, or 'wasted', as heat energy from the energy-saving lamp. It's more efficient than the filament lamp.
Calculating efficiency
The efficiency of a device, such as a lamp, can be calculated:
efficiency = useful energy out ÷ total energy in (for a decimal efficiency)
or
efficiency = (useful energy out ÷ total energy in) × 100 (for a percentage efficiency)
The efficiency of the filament lamp is 10 ÷ 100 = 0.10 (or 10%). This means that 10 per cent of the electrical energy supplied is transferred as light energy (90 per cent is transferred as heat energy).
The efficiency of the energy-saving lamp is 75 ÷ 100 = 0.75 (or 75 per cent). This means that 75 per cent of the electrical energy supplied is transferred as light energy (25 per cent is transferred as heat energy).
Note that the efficiency of a device will always be less than 100 per cent. Occasionally the power is shown in W instead of the energy in J. The equations are the same – just substitute power for energy:
efficiency = useful power out ÷ total power in (for a decimal efficiency)
or
efficiency = (useful power out ÷ total power in) × 100 (for a percentage efficiency)
This is the Sankey diagram for a typical energy-saving lamp:
you can find the resistance using this formula
R = V ÷ I
where; V is the potential difference in volts, V
I is the current in amperes (amps), A
R is the resistance in ohms, Ω
The precision of a balance is ±0.02 g. The accepted value for a measurement is 26.86 g. Which measurement is in the accepted range?
26.02 g
26.82 g
26.87 g
26.90 g
Explanation:
The precision of a balance is ±0.02 g.
The accepted value for a measurement is 26.86 g.
The accepted range is: =[26.86-0.02, 26.86+0.02] = [26.84, 26.88]So,26.87 g is correct
Can someone help me with this? (The answer marked in red text is a incorrect answer)
I think the answer is A
Explanation:
the bus has more kg than the car so. the bus need to stop first
explain how the composition of a star that will form a billon years in the future will differ the composition of our sun.
Answer:
Explanation:
Basically the star slowly burns its hydrogen into Helium. Depending on the mass, the star will have a turbulent core where the Helium will be fully mixed or a radiative core where the helium will settle at the centre (remember it's heavier than Hydrogen). The second case is what happens in the Sun.
You travelled from Ras al Khaimah to Abu Dhabi by road in 3 hour. The distance between the two cities is 270 km, whereas the aerial (by air) distance is 210 km.
note: Aeroplane always flies in straight line.
Please choose one of these answers:
A) average velocity is 60 km/h
B) average velocity is 70 km/h
C) average velocity is 80 km/h
D) average velocity is 90 km/h
briefly explain about electrophorus
Answer:
a device for repeatedly generating static electricity by induction.
Explanation:
what is photoelectric effect
[tex]{\underbrace{\sf{PHOTO-ELECTRIC~EFFECT }}}[/tex]
The photoelectric effect is a phenomenon in which electrons are ejected from the surface of a metal when light is incident on it. These ejected electrons are called photoelectrons. It is important to note that the emission of photoelectrons and the kinetic energy of the ejected photoelectrons is dependent on the frequency of the light that is incident on the metal’s surface.
Answer:
Photoelectric effect is the phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation. The effect is often defined as the ejection of electrons from a metal plate when light falls on it.
1. A net force of 15 N is applied to a cart with a mass of 2.1 kg.
a. What is the acceleration of the cart?
b. How long will it take the cart to travel 2.8 m, starting from rest?
Answer:
acceleration=force*mass
a=fm
a=15*2.1
a=31.5
acceleration is 31.5
hope it helps
5) Match the following.
1) workstation
2) Network interface card
3) hub
4) server
Hope this helped you- have a good day bro cya)
Please help pleeeeeeaaaassseeee help
During rubbing, [tex]^E^L^E^C^T^R^O^N^S[/tex] are transferred between the woolen cloth and the balloon.
Hope this helps!
[tex]GraceRosalia[/tex] here to help
. In a wave, …………………… is carried from one place to another.
Answer:
which wave sound wave or water wave
1. Starting today. I will now change my behavior/s like ______________ because _________________
2. As an adolescent, I promise that _________
3.changes happening during puberty stage are ____________
4. I enjoy the puberty stage because _____________
Kukumplituhin nyo lang po yan base po sainyo
SALAMAT ❤️
Answer:
be mature, it's the only way to be called independent, I will help my parents with doing chores, you will meet new friends
Explanation:
it's just my own understanding
Answer:
1eating junk food
2 I will be a good girl
A refrigerator is 3cm by 3cm by 6cm wat is the volume of the refrigerator?
Explanation:
volume= 3cm×3cm×6cm=18cm3
Question 8 of 35
A car has a mass of 1000 kg and is travelling at a speed of 26 m/s. Calculate the kinetic energy of the
car. Use the word equation below to help you.
kinetic energy = 0.5 x mass x (speed)?
Answer:
338,000 JExplanation:
The kinetic energy of an object can be found by using the formula
[tex]k = \frac{1}{2} m {v}^{2} \\[/tex]
m is the mass
v is the velocity
From the question we have
[tex]k = \frac{1}{2} \times 1000 \times {26}^{2} \\ = 500 \times 676 \\ = 338000[/tex]
We have the final answer as
338,000 JHope this helps you
A charge of 24 C pass a certain point in a conductor in 10 s. What is the size of current in the conductor?
Answer:
write the name of any five districts of nepal
Answer:
2.4A
Explanation:
I = Q/t
I = 24/10
= 2.4A
find the components to write this vector in unit vector notation: 63.5 A please help
Vector is perpendicular to x axis or i component.
Hence i component is 0
j component is 63.5
[tex]\\ \sf\longmapsto \overrightharpoon{A}=0\hat{i} +63.5\hat{j}[/tex]
calculating velocity: How long would it take for a person to sprint from the 0m line to the 100m line if they are traveling forward at 6m/s?
-
Please do show me how you solved it
Answer:
16.7s
2x10^1 s (if you need a 1 significant digit answer)
Explanation:
The formula for average velocity is
Vavg = Δd/Δt
Fill in the known values
6m/s = 100m/Δt
Rearrange the equation
Δt = 100m/6m/s
Δt = 16.7s
note: this answer assumes that the person travels at a constant 6m/s (the person does not slow down or speed up)
MY PAPER IS DUE IN AN HOUR!!!
Your challenge- Write a paper on how to build, construct, and engineer a faster roller coaster. You essay must contain 5 paragraphs minimum. Each paragraph must be 3 sentences minimum.
Potential energy, Kinetic energy, Thermal energy and friction, speed, velocity, and acceleration, and the law of conservation of energy must be the main ideas of your paragraphs
Answer:
right about everything real life and doing or you love doing
Explanation:
I did the same thing I got a hundred on it
From the roof of the Daily Planet, Superman spots a child in distress. In the first second after taking off, he travels 1500 m east and 500 m downward. What is the angle below the horizontal that superman is heading?
Answer:
90 degrees
Explanation:
actiong-reaction of the bat hits the ball.
Answer:
according to newtons third law ,the force exerted.by the bat hitting the ball will be equal in magnitude . but opposite in direction of the force the ball exerts on the batA driver without a seat belt getting thrown from the car in a collision is an example of Newton’s?
A car’s gas tank holds 16 gallons of gasoline. If 1 gal = 3.785 L, how many liters of gasoline does the tank hold?
Answer: 60.56
Explanation: Just multiply 3.785 by 16.
Which gas law describes the relationship between temperature and pressure at a constant volume?
Boyle’s law
Charles’s law
Gay-Lussac’s law
combined gas law
Answer:
Charles's law
Explanation:
7. The______
is used for short approaches from the rough and fairways of less than 125 yards.
No. 4 iron
No. 7 wood
putter
pitching or sand wedge
Answer:
Putter
Explanation:
I looked it up. It said golf club but putter is the same thing I believe. :)
Answer:
pitching or sand wedge
Explanation:
his club can also be used to get out of sand traps.
A lemon drops from a tree and falls to the ground 3.5 meters below. Determine:
a. How much time does it take for the lemon to reach the ground?
b. What is the lemon´s velocity just before it hits the ground (Vf)?
A car is towing a boat on a trailer. The driver starts from rest and accelerates to a velocity of 11 m/s in a time of 28 s. The combined mass of the boat and trailer is 410 kg. The frictional force acting on the trailer can be ignored. What is the tension in the hitch that connects the trailer to the car
The tension on the hitch that connects the trailer to the car is 160 N.
From the information provided;
Initial velocity = 0 m/s (the car started from rest)
Final velocity = 11 m/s
Time taken = 28 s
From the formula;
a = v - u/t
a = 11 - 0/28 = 0.39 ms-2
The force that acts on the trailer = tension in the hitch that connects the trailer to the car
Force = mass × acceleration
Force = 410 kg × 0.39 ms-2
Force = 160 N
Learn more: https://brainly.com/question/24857760
describe a good speech choir.
Speech choirs are performance groups that recite speeches in unison, often with elements of choreography and costuming to help bring the speech to life. Much like musical choirs, dynamic -- volume -- range, expression and accurate coordination of syllables are all important for a successful performance.
pls an answer!
fast!!
Answer:
letter C
Explanation:
write 9.423 x 10^-9 in expanded form
Answer:
Very large and very small numbers written in standard form take up a large amount of space. They are hard to read and understand and are difficult to use in mathematics. One way to write a very large or very small number is to use a different form of notation. Converting to a workable number is done using scientific or engineering notation.
Explanation:
.
O
Allison drove 150 miles for 2.5 hours.
Benjamin drove for 2.73 hours and traveled 175 miles.
• Lily drove 160 miles for 2.58 hours.
• George drove for 2.46 hours and traveled 155 miles.
Which person drove at the fastest constant speed?
The formula for calculating speed: Speed = Distance/Time
Answer:
Benjamin was fastest
Explanation:
Allison- 150/2.5= 60mph
Benjamin- 175/2.73= 64.1
Lily- 160/2.58= 62.01
George- 155/2.46= 63.008