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
Tanzania [10]
3 years ago
7

Two identical resistors are connected in parallel across a 26-V battery, which supplies them with a total power of 7.1 W. While

the battery is still connected, one of the resistors is heated so that its resistance doubles. The resistance of the other resistor remains unchanged. Find (a) the initial resistance of each resistor, and (b) the total power delivered to the resistors after one resistor has been heated.
Physics
1 answer:
Gnom [1K]3 years ago
8 0

Answer:

A) R = 190.42 Ω

B) P = 5.325 W

Explanation:

We are given;

Total power;P_tot = 7.1 W

Voltage;V = 26 V

A)We are told that while the battery is still connected, one of the resistors is heated, so that its resistance doubles.

Thus, the power is doubled.

Now, formula for power is;

P = IV

Thus, since power is doubled, we have;

P = 2(IV)

Now, formula for current is; I = V/R

So, P = 2V²/R

Making R the subject, we have;

R = 2V²/P

In this question, P is p_total = 7.1 W

Thus;

R = (2 × 26²)/7.1

R = 190.42 Ω

B) Now, the resistance of the resistors are R and 2R.

Formula for power in this context is;

P = V²/R

Thus,

Total power delivered to the resistors is;

P = V²/R + V²/2R

P = 3V²/2R

P = (3 × 26²)/(2 × 190.42)

P = 5.325 W

You might be interested in
BABY BABY BABY OOOHHHH I THOUGHT THAT U WOULD ALWAYS BE MINE
kenny6666 [7]

Answer:

Don't you worry, 'cause everything's gonna be alright, ai-a'ight

Be alright, ai-a'ight

Explanation:

6 0
2 years ago
Read 2 more answers
You are piloting a helicopter which is rising vertically at a uniform velocity of 14.70 m/s. When you reach 196.00 m, you see Ba
Cloud [144]

Answer:

The ball reaches Barney  head in  t = 8 \ s

Explanation:

From the question we are told that

 The rise velocity is  v  =  14.70 \  m/s

  The height considered is h =  196 \  m

   The horizontal velocity of the large object is  v_h  =  8.50 \  m/s

   

Generally from kinematic equation  

   s = ut + \frac{1}{2} gt^2

Here s is the distance of the object from Barney head ,

        u is the velocity of the object along the vertical axis which is equal but opposite to the velocity of the helicopter

So  

     u = -14.7 m/s

So

    196  = -14.7 t  + \frac{1}{2} * 9.8 * t^2

=  4.9 t^2 - 14.7t - 196 = 0

Solving the above equation using quadratic formula  

    The value of  t obtained is  t = 8 \ s

6 0
3 years ago
How is the acceleration of an object in newtons second law related to its mass and the net force on it?
9966 [12]
B) Acceleration is directly proportional to the mass of the object
4 0
3 years ago
Read 2 more answers
Help me with this please!!!!!!!!!!!!!!!!
olga55 [171]

Answer:

what do you need help with?

Explanation:

I would look up the periodic table of elements

hope this helps!

6 0
2 years ago
In a typical lightning strike, 2.0 c flows from cloud to ground in 0.24 ms. what is the current during the strike?
lyudmila [28]
Current = charge/time = (2 c)/(0.00024 sec)= 8,333 Amps !
4 0
3 years ago
Other questions:
  • The author s feeling about a subject or topic, which is evidenced in word choice, is called __________. conflict resolution tone
    8·2 answers
  • Gravity pulls downward on a rock with a force of 800 N. If you pull upward on the rock with a force of 400 N, what is the total
    7·2 answers
  • It’s for a cross word and mechanical doesn’t fit ☹️
    11·1 answer
  • Through Newton’s third law of motion, we know that if a rocket ship pushes down on the ground, the ground will push back up on t
    7·1 answer
  • How many changes can this undergo?Does it mean from this current state or how it can change.Please explain it to me.If you were
    12·1 answer
  • 7. An object can be accelerating even if its speed is
    15·2 answers
  • How long would a circuit be connected to produce a current of 0.65 A with a charge of 380 C?
    7·1 answer
  • Describe what is happening to the speed during the period (I). 0s - 10s __________________________________________________ (II).
    11·1 answer
  • Identify the vibrating media in three different types of musical instruments
    15·1 answer
  • The rubber band contains .......potential energy as it is stretched.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!