1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Harlamova29_29 [7]
2 years ago
14

Electronic flash units for camera contain a capacitor for storing the energy used to produce the flash. In one such unit, the fl

ash lasts for 1675s with an average light power output of 2.70 x 105 W . (a) If the conversion of electric energy to light is 95% efficient ( the rest of the energy goes to thermal energy), how much energy must be stored in the capacitor for one flash
Physics
1 answer:
nadezda [96]2 years ago
8 0

Answer:

420J

Explanation:

Power is the time rate of change in energy. Power is the ratio of energy to time. The S.I unit of power is in watts.

Given that the flash lasts for 1/675 s, power output is 2.7 * 10⁵ W. Hence:

Power = Energy / time

Substituting:

2.7 * 10⁵ W = Energy / (1/675)

Energy = 2.7 * 10⁵ W * 1/675 = 400J

Therefore the energy emitted as light is 400J.

Since the conversion of electric energy to light is 95% efficient, hence the energy stored as electrical energy is:

Energy(capacitor) = 5% of 400J + 400J = 0.05*400 + 400

Energy(capacitor) = 420J

You might be interested in
Một electron di chuyển theo đường tròn vuông góc với từ trường đều 1mT. Moment động lượng của electron đối với tâm vòng tròn là
8090 [49]

Answer:

can you translate in English

Explanation:

maybe if u did I wouldv help u?

7 0
2 years ago
The wheel of a car has a radius of 0.413 m. If the wheel rotates at 456 revolutions per minute, what is the speed (in m/s) at wh
suter [353]

Answer: The speed of the edge of the wheel = 19.72m/s

Explanation:

The liner speed of the edge of the wheel is given as;

V=wr

V= linear speed =?

w= angular velocity =456rpm

Converting rpm to rad/s

1rpm = π/30 rad/s

456rpm = 47.75 rad/s

r=0.413m

V=47.75 × 0.413

V= 19.72m/s

Therefore speed of the edge of the wheel = 19.72m/s

7 0
3 years ago
Read 2 more answers
A person standing at the edge of a seaside cliff kicks a stone horizontally over the edge with a speed of 18 m/s. The cliff is 5
Fed [463]

Answer:

it would take 3.26 seg for the stone to fall to the water

Explanation:

If we ignore air friction then:

h=h₀ + v₀*t -1/2*g*t²

where

h= coordinates of the stone in the y axis ( height of the stone relative to the surface of the water )

h₀ = initial coordinates of the stone ( height of the cliff relative to the surface of the water = 52 m )

v₀ = initial <u>vertical </u>velocity = 0 ( since the ball is kicked horizontally , has only initial horizontal velocity , and has 0 vertical velocity )

t = time to reach a height h

g = gravity = 9.8 m/s²

since v₀ =0

h= h₀ - 1/2*g*t²

h₀ - h =  1/2*g*t²

t= √[2(h₀ - h)/g]

when the stone hits the ground h=0 ( height=0) , then replacing values

t=√[2(h₀ - h)/g]=√[2(52 m- 0 m )/(9.8m/s²)] = 3.26 seg

t= 3.26 seg

it would take 3.26 seg for the stone to fall to the water

7 0
3 years ago
Which of the following statement describes a nonpolar molecule
Sati [7]

Answer:

?

Explanation:

what are the statements

5 0
2 years ago
Read 2 more answers
Which of these letters is the symbol for current in equations A: c B: i C: r D: t
True [87]
  Answer:  [B]:  The letter, "<em /> I " ; for current;  in units of "Amps" .
__________________________________________________
4 0
3 years ago
Other questions:
  • Explain why a magnet sitting next to a wire does not induce a current in a wire
    12·1 answer
  • Four equal negative point charges are located at the corners of a square, their positions in the xy-plane being (1,1), (−1,1), (
    14·2 answers
  • In the figure, a 3.7 kg block slides along a track from one level to a higher level after passing through an intermediate valley
    7·1 answer
  • _____ was responsible for the contribution that light is emitted and absorbed in bundles that are dependent on the frequency of
    10·1 answer
  • Astronomersestimatethata2.0-km-diameterasteroidcollides with the Earth once every million years. The collision could pose a thre
    7·2 answers
  • Circuit theroy: Find current in Ix and Iy
    11·1 answer
  • When a certain air-filled parallel-plate capacitor is connected across a battery, it acquires a charge of 200 µC on each plate.
    10·1 answer
  • "an open tank has the shape of a right circular cone. the tank is 6 feet across the top and 5 feet high. how much work is done i
    15·1 answer
  • A student puts a besker of warm water next to a besker of cold water so that they fough which two statements are true? DA Therma
    10·1 answer
  • You place a box weighing 242.4 N on an in- clined plane that makes a 37.2° angle with the horizontal. Compute the component of t
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!