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
Alexus [3.1K]
3 years ago
9

When a potential difference of 10 V is placed across a certain solid cylindrical resistor, the current through it is 2 A. If the

diameter of this resistor is now tripled, what will be the new current through the resistor?
Physics
1 answer:
Keith_Richards [23]3 years ago
8 0

Answer:

New Resistance = 0.5556 ohm

Explanation:

Resistance = resistivity * length /area

Here since resistivity and length are constant, we only need to see how the resistance increases or decreases with change in area.

New Area = pi * (3*D)^2 / 4

Old Area = pi * D^2 / 4

The ratio of new area / old area is :

\frac{New Area}{Old Area} = 9

Since area increases 9 times, and it is inversely proportional to resistance:

Resistance decreases by 9 times.

So, old resistance = Voltage / Current = 10 / 2 = 5 ohm

New Resistance = 5 / 9 = 0.5556 ohm    (decreases by 9 times)

You might be interested in
A freight car moves along a frictionless level railroad track at constant speed. The freight car is open on the top. A large loa
Fittoniya [83]

The added weight of the sand puts more downward pressure on the wheels contacting the rails, which would cause the trains speed to decrease.

3 0
3 years ago
The last is 80 meter per second,please in am in exam​
inna [77]

Answer:

  1. I have fond the answer

Explanation:

but my camera doesn't work

7 0
3 years ago
Read 2 more answers
A simple model for a person running the 100 m dash is to assume the sprinter runs with constant acceleration until reaching top
Trava [24]

Answer:

He will complete the race in total time of T = 10 s

Explanation:

Total distance moved by the sprinter in 2.14 s is given as

s = \frac{(v_{in} + v_{f})}{2} time

s = \frac{(0 + 11.2)}{2} (2.14)

s = 11.98 m

now the distance remaining to move

d = 100 - 11.98 = 88 m

now he will move with uniform maximum speed for the remaining distance

so we will have

time = \frac{d}{v}

time = \frac{88}{11.2} = 7.86 s

so the total time to complete the race is given as

T = 7.86 + 2.14 = 10 s

6 0
3 years ago
4
12345 [234]

Answer:

charcoal is the correct answer

hope it helps , pls mark me as brainliest

6 0
3 years ago
The electromagnetic waves that have the lowest frequencies are called
o-na [289]
A. Radio waves
Have the lowest frequencies
4 0
3 years ago
Other questions:
  • Objects in motion eventually stop moving due to a _____ .can someone help me with this question
    7·1 answer
  • Here the file attached
    10·2 answers
  • The alternating current which crosses an apparatus of 600 W has a maximum value of 2.5 A. What is efficient voltage between its
    8·1 answer
  • The frequency of which type of electromagnetic wave is just higher than that of visible light?
    6·1 answer
  • Geosynchronous satellites orbit the Earth at a distance of 42 000 km from the Earth's center. Their angular speed at this height
    13·1 answer
  • A car traveling 91 km/h is 280 m behind a truck traveling 76 km/h.
    13·1 answer
  • A spring is hanging from the ceiling. Attaching a 500 g physics book to the spring causes it to stretch 20 cm in order to come t
    10·1 answer
  • What is an electric circuit?
    10·2 answers
  • Kinetic energy is stored in a stretched rubber
    13·2 answers
  • Four students measured the acceleration of gravity. The accepted value for
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!