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
insens350 [35]
4 years ago
9

To practice Problem-Solving Strategy 25.1 Power and Energy in Circuits. A device for heating a cup of water in a car connects to

the car's battery, which has an emf E = 10.0 V and an internal resistance rint = 0.03 Ω . The heating element that is immersed in the cup of water is a resistive coil with resistance R. David wants to experiment with the device, so he connects an ammeter into the circuit and measures 10.0 A when the device is connected to the car's battery. From this, he calculates the time to boil a cup of water using the device. If the energy required is 100 kJ , how long does it take to boil a cup of water?
Physics
1 answer:
mr_godi [17]4 years ago
6 0

Answer:

 t = 1030 s

Explanation:

Let's start by calculating the resistance of the coil,

    V = I (R + ri)

    R = V / I - ri

    R = 10/10 -0.03

    R = 0.97  Ω

Now we can calculate the power supplied to the water

   P = I2 R

   P = 10 2 0.97

   P = 97 w

Work energy is power for time

   E = W = P t

   t = W / P

   t = 100 103/97

   t = 1030 s

You might be interested in
Which list of observations is the best evidence of only a chemical change occurring?
Aleonysh [2.5K]

Answer:

d

Explanation:

7 0
3 years ago
"A toy airplane flies clockwise at a constant speed in a horizontal circle of radius 8.0 meters. The magnitude of the accelerati
Citrus2011 [14]

For the answer to the question above, so at the instant, the acceleration of the airplane is southward, the direction of the velocity is also southward. The direction should be the same because it is both a vector quantity and it does not make sense if the direction and acceleration have different direction.
6 0
3 years ago
Read 2 more answers
Given that average speed is distance traveled divided by time, determine the values of m and n when the time it takes a beam of
emmainna [20.7K]

Answer:

5,2

Explanation:

From the question we are told that:

Speed of light C=3.0×10^8 m/s.

Generally the equation for Average Speed is mathematically given by

V_{avg}=\frac{d}{t}

Where

d=Distance between the Earth and the sun

d=1.5*10^11m

Therefore

t=\frac{d}{V_{avg}}

t=\frac{1.5*10^11m}{3.0×10^8 m/s.}

t=5*10^2s

Since m and n is given in the form of

m*10^n

Therefore

m=5 & n=2

5,2

3 0
3 years ago
I don't get the flat line on a graph. on a distance/speed or motion graph, they say it is not moving. that is what I don't get i
timofeeve [1]
A flat line means the the speed is the same . Its moving at the same pace.
4 0
4 years ago
What is the largest four subsystems?​
AnnZ [28]

Explanation:

Everything in Earth's system can be placed into one of four major subsystems: land, water, living things, or air. These four subsystems are called "spheres." Specifically, they are the "lithosphere" (land), "hydrosphere" (water), "biosphere" (living things), and "atmosphere" (air).

5 0
3 years ago
Other questions:
  • Keiko builds a transformer in the lab, but it does not decrease the voltage as much as she needs. What should Keiko change to fu
    11·2 answers
  • Which element has 7 valence electrons?
    7·1 answer
  • Ask Your Teacher An electric utility company supplies a customer's house from the main power lines (120 V) with two copper wires
    11·1 answer
  • The formula to calculate velocity is
    11·1 answer
  • Which of the following are relatively unchanged fragments from the early period of planet building in the solar system? a. aster
    9·1 answer
  • Randy used to have poor health. Recently, he has lost a lot of weight and has started feeling much better, but he doesn't know w
    13·2 answers
  • Change the following as indicated in the brackets.<br> 8m (km,cm)​
    8·2 answers
  • Select the correct answer.
    8·1 answer
  • Can a physical quantity have units but still be dimensionless?
    14·2 answers
  • Which transformation will map figure L onto figure L'? (1 point) Two congruent triangles Figure L and Figure L prime are drawn o
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!