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
raketka [301]
3 years ago
14

The quantity of charge Q in coulombs (C) that has passed through a point in a wire up to time t (measured in seconds) is given b

y
Q(t)=t3−2t2+4t+4

Find the current when t = 1s. At what time is the current lowest?
Physics
1 answer:
Mnenie [13.5K]3 years ago
7 0

Explanation:

The quantity of charge Q in coulombs (C) that has passed through a point in a wire up to time t (measured in seconds) is given by :

Q=t^3-2t^2+4t+4

We need to find the current flowing. We know that the rate of change of electric charge is called electric current. It is given by :

I=\dfrac{dQ}{dt}\\\\I=\dfrac{d(t^3-2t^2+4t+4)}{dt}\\\\I=3t^2-4t+4

At t = 1 s,

Current,

I=3(1)^2-4(1)+4\\\\I=3\ A

So, the current at t = 1 s is 3 A.

For lowest current,

\dfrac{dI}{dt}=0\\\\\dfrac{d(3t^2-4t+4)}{dt}=0\\\\6t-4=0\\\\t=0.67\ s

Hence, this is the required solution.

You might be interested in
at 1 p.m. a car traveling at a constant velocity of 78 km per hour towards the West it's 34 km to the west of our school how far
Fittoniya [83]

83 km/h * 2.5 hours (3:30 - 1:00) = 207.5 km  

207.5 km - 15 km = 192.5 km

3 0
3 years ago
1.- Del siguiente sistema de fuerzas en el cual la interacción de todas las tensiones hace que
Crazy boy [7]

Answer:

i can help you but go to the school Grade 4 like my pro

Explanation:

7 0
3 years ago
PLS HELP
Ahat [919]
<h3>B. True</h3>

"This was the idea that non-living objects can give rise to living organisms."

7 0
3 years ago
Do you divide mass by volume to get density
bogdanovich [222]
Density<span> is the </span>mass<span> of an object </span>divided<span> by its </span>volume<span>. So the answer would be Yes. Hope it helps! (:</span>
7 0
3 years ago
Your friend wants to join the school track team, and has asked for your help to determine how fast she can run. What kind of inf
Zigmanuir [339]

Answer:

you calculate a specific type of run for example 100m and it takes 20 seconds to finish and calculate the time it takes them to finish

hope this helps

have a good day :)

Explanation:

6 0
3 years ago
Other questions:
  • 60 kilometers in 4 hours, what is the average speed?​
    9·1 answer
  • Which statement best defines a motor unit? A. a motor nerve and the muscle cells it stimulates B. a nerve supplying a muscle ori
    14·1 answer
  • In the United States, car accidents are the leading cause of death for teenagers. Wearing seat belts helps save lives. Describe
    10·1 answer
  • Can I get some help please?
    12·1 answer
  • Water flows over a section of Niagara Falls at the rate of 1.1 × 106 kg/s and falls 50.0 m. How much power is generated by the f
    12·1 answer
  • If an EM wave has a wavelength of 400nm,what is its frequency? What kind of wave is it?
    10·2 answers
  • 2 points
    5·2 answers
  • The achilles tendon is subjected to a large tension stress that results in a strain of 6%. if the unloaded tendon is 10 cm long,
    5·1 answer
  • What type of energy is stored in a pendulum at the top of its arc?
    7·2 answers
  • 300N effort is applied to lift the load of 900N by using a first class lever. If the distance between the load and fulcrum is 20
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!