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
maksim [4K]
3 years ago
5

If the current through a bulb in a series circuit is 0.4 A and the potential difference across the bulb is 3 V then what is the

resistance? Offering 25 points!
Physics
1 answer:
sergey [27]3 years ago
8 0

Resistance of the bulb is 7.5 ohms

Explanation:

  • In a circuit, according to Ohm's Law, the potential difference (voltage) across an element is directly proportional to the current flowing through it.

That is, V ∝ I

⇒ V = IR, where R is the constant of proportionality called the resistance.

  • Here, current, I = 0.4 A and potential difference, V = 3 V

Resistance, R = V/I = 3/0.4 = 7.5 ohms

You might be interested in
Which best describes a parallel circuit?
yarga [219]

c more than 1 pwy..................

8 0
4 years ago
(a) What magnitude point charge creates a 10,000 N/C electric field at a distance of 0.250 m? (b) How large is the field at 10.0
Sergio039 [100]
<h2>Answer:</h2>

(a) 6.95 x 10⁻⁸ C

(b) 6.25N/C

<h2>Explanation:</h2>

The electric field (E) on a point charge, Q, is given by;

E = k x Q / r²              ---------------(i)

Where;

k = constant = 8.99 x 10⁹ N m²/C²

r = distance of the charge from a reference point.

Given from the question;

E = 10000N/C

r = 0.250m

Substitute these values into equation(i) as follows;

10000 = 8.99 x 10⁹ x Q / (0.25)²

10000 = 8.99 x 10⁹ x Q / (0.0625)

10000 = 143.84 x 10⁹ x Q

Solve for Q;

Q = 10000/(143.84 x 10⁹)

Q = 0.00695 x 10⁻⁵C

Q = 6.95 x 10⁻⁸ C

The magnitude of the charge is 6.95 x 10⁻⁸ C

(b) To get how large the field (E) will be at r = 10.0m, substitute these values including Q = 6.95 x 10⁻⁸ C into equation (i) as follows;

E = k x Q / r²

E = 8.99 x 10⁹ x 6.95 x 10⁻⁸ / 10²

E = 8.99 x 10⁹ x 6.95 x 10⁻⁸ / 100

E = 6.25N/C

Therefore, at 10.0m, the electric field will be just 6.25N/C

3 0
3 years ago
An 18-cm-long bicycle crank arm, with a pedal at one end, is attached to a 20-cm-diameter sprocket, the toothed disk around whic
Tpy6a [65]

Answer:

Part a)

a = 0.056 m/s^2

Part b)

L = 7.85 m

Explanation:

Part a)

Angular speed of the pedal is changing from 60 rpm to 90 rpm in 10 s

so the angular acceleration is given as

\alpha = \frac{\omega_2 - \omega_1}{\Delta t}

so we will have

\alpha = \frac{2\pi(\frac{90}{60}) - 2\pi(\frac{60}{60})}{10}

\alpha = 0.314 rad/s^2

now the tangential acceleration of the pedal is given as

a = r \alpha

a = 0.18 \times 0.314

a = 0.056 m/s^2

Part b)

Total angular displacement made by the sprocket in the interval of 10 s is given as

\theta = \frac{\omega_f + \omega_i}{2} t

\theta = \frac{2\pi (\frac{90}{60}) + 2\pi (\frac{60}{60})}{2}(10)

\theta = 78.5 radian

now length of the chain passing over it is given as

L = R\theta

L = 0.10 \times 78.5

L = 7.85 m

6 0
4 years ago
(03.03 mc)when two mechanical waves have a displacement in the same direction, and they overlap, what will the resulting wave lo
notsponge [240]
The waves would combine to form a wave with a displacement equal to the sum of the two initial waves. This is called constructive inteference.
5 0
4 years ago
Read 2 more answers
Hi. i have a question about the given question ​
Darya [45]

Answer:

Play fortnite with me socials 90s is my name hmu

Explanation:

Cause i am a freaking demon at fortnite trust!

6 0
3 years ago
Other questions:
  • In terms of energy, think about what happens when you eat a hot meal. Describe all the different forms of energy that you experi
    8·1 answer
  • If points a and b are connected by a wire with negligible resistance, find the magnitude of the current in the 12.0 v battery.
    14·1 answer
  • A chain saw produces a spherical sound wave having a frequency of 214Hz in air at 358C (308.2K or 958F). At a distance of 600mm
    14·1 answer
  • A positive charge is moved from one point to another point along an equipotential surface. The work required to move the charge
    11·1 answer
  • Complete the following statement: today, the standard unit of time is defined in terms of
    11·1 answer
  • A pulley with a mechanical advantage of 5 will require you to pull _____ times the amount of rope.
    10·1 answer
  • Please Help!!!!
    6·1 answer
  • Which of these energy transformations is not part of how a nuclear power plant
    10·1 answer
  • One Newton is equivalent to<br> A. 1 kg/s2<br> B. 1 kg*m/s<br> C. 1 kg*m/s2<br> D. 1 kg/s
    5·1 answer
  • How do I figure this out?
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!