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
cluponka [151]
3 years ago
13

If two lightbulbs are parallel to each other, they have the same brightness. If the same two lightbulbs are put in series with e

ach other, they also have the same brightness but are dimmer than when they are in parallel. Explain why.
Physics
1 answer:
djverab [1.8K]3 years ago
6 0

Answer:

Explanation:

The bulbs becomes dimmer because effective resistance of the circuit increases since the resistance of the circuit in series connection involves adding the individual resistance compared to in parallel connection where the effective resistance = 1 / R1 + 1/R2 = R1 R2 / ( R2 + R1). The brightness remains the same because the lightbulbs must be of the same resistance. Also using ohm's law

V = IR

I = V / R

I is inversely proportional to the current in the circuit so as R, effective resistance of the circuit increases, I, current decreases  and vice versa

You might be interested in
Which type of mirror causes light rays to refract away from each other?
Vikentia [17]
Mirrors don't cause refraction.

A convex mirror could cause parallel rays to REFLECT away from each other.
8 0
3 years ago
Whats the answer to 45 + 54 ÷ p - q
Lynna [10]
There’s nothing to answer to
4 0
3 years ago
Recall from Chapter 1 that a watt is a unit of en- ergy per unit time, and one watt (W) is equal to one joule per second ( J·s–1
harkovskaia [24]

Answer:

Explanation:

The energy of a photon is given by the equation E_p=h f, where h is the <em>Planck constant</em> and f the frequency of the photon. Thus, N photons of frequency f will give an energy of E_N=N h f.

We also know that frequency and wavelength are related by f=\frac{c}{\lambda}, so we have E_N=\frac{N h c}{\lambda}, where c is the <em>speed of light</em>.

We will want the number of photons, so we can write

N=\frac{\lambda E_N}{h c}

We need to know then how much energy do we have to calculate N. The equation of power is P=E/t, so for the power we have and considering 1 second we can calculate the total energy, and then only consider the 4% of it which will produce light, or better said, the N photons, which means it will be E_N.

Putting this paragraph in equations:

E_N=(\frac{4}{100})E=0.04Pt=(0.04)(100W)(1s)=4J.

And then we can substitute everything in our equation for number of photons, in S.I. and getting the values of constants from tables:

N=\frac{\lambda E_N}{h c}=\frac{(520 \times10^{-9}m) (4J)}{(6.626\times10^{-34}Js) (299792458m/s)}=1.047 \times10^{19}

3 0
3 years ago
The ozone layer protects us from the harmful effects of which type of radiation?
leonid [27]

Answer:

Hey there

The ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation

Can u have brainly

3 0
2 years ago
A ball is dropped from an upper floor, some unknown distance above your apartment. As you look out of your window, which is 1.50
laila [671]

Answer:

The ball is dropped at a height of 9.71 m above the top of the window.

Explanation:

<u>Given:</u>

  • Height of the window=1.5 m
  • Time taken by ball to cover the window height=0.15

Now using equation of motion in one dimension we have

s=ut+\dfrac{at^2}{2}

Let u be the velocity of the ball when it reaches the top of the window

then

1.5=0.15u+\dfrac{9.8\times0.15^2}{2}\\u=3.96\ \rm m/s\\

Now u is the final velocity of the ball with respect to the top of the building

so let t be the time taken for it to reach the top of the window with this velocity

3.96=gt\\t=0.4\ \rm s\\

Let h be the height above the top of the window

h=\dfrac{gt^2}{2}\\\\h=\dfrac{9.8\times 0.4^2}{2}\\h=9.71\ \rm m

3 0
3 years ago
Other questions:
  • Consider lifting a box of mass m to a height h using two different methods: lifting the box directly or lifting the box using a
    8·1 answer
  • If you lift one load up two stories, how much work do you do compared to lifting one load up only one story?
    11·1 answer
  • On an amusement park ride, riders stand inside a cylinder of radius 8.0 m. At first the cylinder rotates horizontally. Then afte
    15·1 answer
  • Your friend has been hired to design the interior of a special executive express elevator for a new office building. This elevat
    14·1 answer
  • Kinetic energy: energy of motion. this means the ________ of objects with mass and velocity
    14·1 answer
  • On a hot summer day, heat waves can be seen rising from the asphalt. What type of heat transfer do the heat waves demonstrate?
    10·1 answer
  • A car moves with an average speed of 45 miles/hour. How long does the car take to travel 90 m
    9·2 answers
  • Imamu’s car is travelling twice as fast as Mosi’s car. Mosi travels 200 km in 2 hours. How long does it take Imamu to travel 50
    14·1 answer
  • What would happen if you didn't have chemical energy in your body? Choose the best answer.
    6·1 answer
  • ভিতে ২০২০ শিকাৰৰে পুনর্বিন্যাসকৃত পাঠ্যসূচি জিভে জ্যাসাইনমেন্ট নিতে চাজ ওয়েন সিত
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!