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
Where would you find convergent and divergent plate boundaries relative to
Sergio [31]

Answer:

When two tectonic plates meet, we get a “plate boundary.” There are three major types of plate boundaries, each associated with the formation of a variety of geologic features.

Explanation:

8 0
2 years ago
A firecracker in a coconut blows the coconut into three pieces. Two pieces of equal mass fly off south and west, perpendicular t
Natasha_Volkova [10]

Answer:

v=12.5 i + 12.5 j m/s

Explanation:

Given that

m₁=m₂ = m

m₃ = 2 m

Given that speed of the two pieces

u₁=- 25 j m/s

u₂ =- 25 i m/s

Lets take the speed of the third mass = v m/s

From linear momentum conservation

Pi= Pf

0 = m₁u₁+m₂u₂ + m₃ v

0 = -25 j m  - 25 i m + 2 m v

2 v=25 j   + 25 i m/s

v=12.5 i + 12.5 j m/s

Therefore the speed of the third mass will be v=12.5 i + 12.5 j m/s

4 0
3 years ago
In the circuit diagram, what does the symbol made of two long lines and two short lines with a positive and a negative sign at e
Tom [10]

For those seeking for the answer, its a source of electrical energy.

8 0
3 years ago
Read 2 more answers
The blades in a blender rotate at a rate of 6800 rpm . When the motor is turned off during operation, the blades slow to rest in
tangare [24]
The angular acceleration of the blade when it's switched off is (-6800 rev/min) divided by (2.8 sec) = -2,428.6 rev/(min-sec) = -40.5 rev/sec^2 .
5 0
3 years ago
During which of the following chemical changes does a precipitate form?
babymother [125]

Answer is B.........

5 0
3 years ago
Read 2 more answers
Other questions:
  • How are heat and light waves produced on and in the sun?
    14·2 answers
  • Star formation begins when
    6·2 answers
  • The rings of Saturn occupy the region inside Saturn's Roche limit.
    15·1 answer
  • While a gymnast is in the air during a leap, which of the following quantities must remain constant for her?A) Angular momentum
    14·1 answer
  • In order for a ship to stay afloat, its buoyant force must be
    12·1 answer
  • A mass hanging from a spring undergoes vertical simple harmonic motion.1) Where in the motion is the velocity equal to zero?At t
    7·1 answer
  • All fires require oxygen () There is no oxygen in that room (T) .
    8·1 answer
  • Is work being done on a barbell when a weight lifter is holding the barbell<br> over his head?
    7·1 answer
  • An Olympic skier moving at 20.0 m/s down a 30.0o slope encounters a region of wet snow, of
    12·1 answer
  • A heat engine is used to convert heat into which of the following?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!