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
Katena32 [7]
3 years ago
11

A lightbulb has an efficiency of 8.2%. How much light energy (not heat energy) is generated by the bulb every second if the bulb

has a power of 21 W?
Physics
1 answer:
vladimir1956 [14]3 years ago
5 0
<span>The efficiency is the useful energy (or power) you get out of a system, divided by the energy (or power) you put in.
</span><span> If the efficiency is 8.2%, that means you get 8.2% * 21 W = 1.72 W of useful power out.
</span>Energy is just power multiplied by time, so 1.72 W * 1 s = 1.72 J<span>.</span>
You might be interested in
Which of these biomes receives the least amount of rainfall every year?
ASHA 777 [7]

Answer:

Desert

Explanation:

The desert receives the least amount of rainfall yearly.

A desert can be described a barren area of land where little amount of rainfall occurs and, because of this, living conditions are not favourable for plants and animal life. Because there is no vegetation in a desert, the bare surface of the ground are subjected to denudation.

5 0
3 years ago
At the Sun Dagger in New Mexico, a dagger-shaped beam of sunlight pierces a spiral
nadya68 [22]

Answer:

D

Explanation:

At noon on the summer solstice. The sun dagger was used to observe astrological readings in the ancient time

7 0
3 years ago
A student drops an object out the window of the top floor of a high-rise dormitory.
seropon [69]

-- The acceleration due to gravity is 32.2 ft/sec² .  That  means that the
speed of a falling object increases by an additional 32.2 ft/sec every second.

-- If dropped from "rest" (zero initial speed), then after falling for 4 seconds,
the object's speed is (4.0) x (32.2) = <em>128.8 ft/sec</em>.

-- 128.8 ft/sec = <em>87.8 miles per hour</em>

Now we can switch over to the metric system, where the acceleration
due to gravity is typically rounded to 9.8 meters/sec² .

-- Distance = (1/2) x (acceleration) x (time)²

       D = (1/2) (9.8) x (4)² =<em>  78.4 meters</em>

-- At 32 floors per 100 meters,  78.4 meters = dropped from the <em>25th floor</em>.


The 5 points are certainly appreciated, but I do wish they were Celsius points.


3 0
3 years ago
A thin film of oil rests on an inclined plane
dolphi86 [110]
What is the question?

3 0
3 years ago
How can electricty be used to create a magnetic field
Strike441 [17]
When a charged particle such as an electron, proton or ion is in motion, magnetic lines of force rotate around the particle. Since electrical current moving through a wire consists of electrons in motion, there is a magnetic field around the wire.      i hope u have smileing day

4 0
3 years ago
Read 2 more answers
Other questions:
  • refrigerant 134a enters a compressor operating at steady state as saturated vapor at 0.12 MPa and exits at 1.2 MPa and 70 C at a
    8·1 answer
  • A(n) ________ has charge but negligible mass, whereas a(n) ________ has mass but no charge.
    10·2 answers
  • An alarm clock draws 0.5 A of current when connected to a 120 volt circuit. Calculate its resistance.
    12·1 answer
  • g From the following choices, select the one correct statement: a. Ultraviolet light has a shorter wavelength than infrared ligh
    9·1 answer
  • True or False: The cycle of seasons on the Earth is caused by the tilt of the Earth on its axis toward and away from the Sun.
    11·1 answer
  • Part A:
    15·2 answers
  • El peso de María es de 617,4 N. Si en dos meses pierde 2,5 Kg de masa, ¿cuál será su nuevo peso?
    14·2 answers
  • Which term describes the forces on object with zero net force​
    6·1 answer
  • 7. The outlets in your home provide
    14·2 answers
  • (Briefly explain what would happen, if there is no existence of capacitor in our world?​
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!