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
lubasha [3.4K]
2 years ago
8

Electrical power companies sell electrical energy

Physics
1 answer:
mixer [17]2 years ago
4 0

Heat used by electric heater :

Q = m • c • ∆T

Q = (75 kg)(4200 J/kg°C)(43°C - 15°C)

Q = 8.82 × 10⁶ J

Cost of electrical energy :

Cost = (8.82 × 10⁶ J)/(3.6 × 10⁶ J) • ($ 0.15)

Cost = $ 0.3675

You might be interested in
Dejamos caer un objeto desde lo alto de una torre y medimos el tiempo que tarda en llegar al suelo que resulta ser de 0,02 minut
Harman [31]

Answer: a) 11.76 m/s  b) 7.056 m

Explanation:

The described situation is as follows:

An object is dropped from the top of a tower and when measuring the time it takes to reach the ground that turns out to be 0.02 minutes.

This situation is related to free fall, this also means we have constant acceleration, hence the equations we will use are:

V_{f}=V_{o}+at (1)  

{V_{f}}^{2}={V_{o}}^{2}+2ad (2)  

Where:  

V_{f} Is the final velocity of the object

V_{o}=0 Is the initial velocity of the object (it was dropped)

a=9.8 m/s^{2} is the acceleration due gravity

d is the height of the tower

t=0.02min=1.2 s is the time it takes to the object to reach the ground

b) Begining with (1):

V_{f}=0+at (3)  

V_{f}=at=(9.8 m/s^{2})(1.2 s) (4)  

V_{f}=11.76 m/s (5)  This is the final velocity of the object

a) Substituting (5) in (2):

(11.76 m/s)^{2}=0+2(9.8 m/s^{2})d (6)  

Clearing d:

d=\frac{(11.76 m/s)^{2}}{2(9.8 m/s^{2})} (7)  

d=7.056 m (8)  This is the height of the tower

4 0
3 years ago
How do I do this question?
Mkey [24]

a. 27

after that all you need to do is use the work formula as you will be able to acheive results

5 0
3 years ago
A student gathered two boxes of the same size made of different materials glass and clear plastic. She placed them on a windowsi
ch4aika [34]

Answer:

dependent variable

Explanation:

8 0
2 years ago
19. Arrange from smallest to largest: the BTU, the joule, and the calorie.
Papessa [141]

Answer: Don't know sorry

Explanation:

5 0
2 years ago
True or False
Allisa [31]
False?


science can be a motivation out of curiosity AND societal needs.

For example:battery operated  cars, are a curiosity and beneficial to the earths environment
4 0
3 years ago
Read 2 more answers
Other questions:
  • A long wire carrying a 5.0 A current perpendicular to the xy-plane intersects the x-axis at x= - 2.0 cm . A second, parallel wir
    14·1 answer
  • A certain wire, 3 m long, stretches by 1.2 mm when under tension of 200 N. By how much does an equally thick wire 6 m long, made
    9·2 answers
  • The acceleration due to gravity on jupiter is 2.5 times whats on earth. An object of mass 10kg is taken to Jupiter. What is the
    5·1 answer
  • What are (a) the kinetic energy, (b) the rest energy, and (c) the total energy of a 1.50 g particle with a speed of 0.600 c ?
    8·1 answer
  • A long, straight, cylindrical wire of radius R carries a current uniformly distributed over its cross section.
    9·1 answer
  • Which part of an atom is gained, lost, or shared during a chemical reaction? Electron
    14·2 answers
  • Help with these questions please?
    10·1 answer
  • The color green and blue are visual preference for newborns<br> A. True<br> B. False
    11·1 answer
  • Which of the following is a purpose of rules in sports and games? (5 points)
    12·1 answer
  • Which of the following objects will have the greatest inertia?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!