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
Ipatiy [6.2K]
3 years ago
15

Number 29 plz help physics

Physics
1 answer:
svetoff [14.1K]3 years ago
8 0

Answer:

a. E = 900000 J = 900 KJ

b. ΔT = 8.18 °C

c. Cost = $ 7.2  

Explanation:

a.

The energy can be given by:

E = Pt

where,

E = Energy = ?

P = Power = 500 W

t = time = (0.5 h)(3600 s/1 h) = 1800 s

Therefore,

E = (500\ W)(1800\ s)

<u>E = 900000 J = 900 KJ</u>

b.

The change in temperature of room air is given by the following formula:

0.5E = mC\Delta T\\   (since 50% of energy is used to heat air)

where,

m = mass of air = 50 kg

C = specific heat of air = 1.1 KJ/kg.°C

ΔT = Change in temperature of air = ?

Therefore,

(0.5)(900\ KJ) = (50\ kg)(1.1\ KJ/Kg.^oC)\Delta T

<u>ΔT = 8.18 °C</u>

c.

First, we will calculate the total energy consumed:

E = (0.5\ KW)(6\ h/d)(30\ d)\\E = 90\ KWh

Now, for the cost:

Cost = (Unit\ Cost)(Energy)\\Cost = (\$ 0.08\KWh)(90\ KWh)

<u>Cost = $ 7.2</u>

You might be interested in
5 . W h ic h o f th e fo l lo w in g is N O T a fu n d a m e n ta l S .I u n it? A . M e te r B . A m p e re C . K e lv in D . R
Flauer [41]

Answer:

D. Radian

Explanation:

hope it helps

5 0
3 years ago
Read 2 more answers
Give a paragraph on how to become a better leader
riadik2000 [5.3K]

Answer:

Anyone can sit in a corner office and delegate tasks, but there is more to effective leadership than that. Effective leaders have major impacts on not only the team members they manage, but also their company as a whole. Employees who work under great leaders tend to be happier, more productive and more connected to their organization – and this has a ripple effect that reaches your business's bottom line

Explanation:

:)

4 0
3 years ago
Helppppp!!<br> can a current run through a metal conductor can create a magnetic field
sineoko [7]

Answer:

yesssssssssssssssssss

7 0
3 years ago
What is the definition of Physics?​
pychu [463]

Answer:

This is the simplified definition.

Explanation:

The main goal of physics is to explain how things move in space and time and understand how the universe behaves.

4 0
3 years ago
Read 2 more answers
A ball of 12 kg is attached to a string of 0.8 meter spun at 4
lesantik [10]

Answer:

240 N

Explanation:

6 0
3 years ago
Other questions:
  • A measurement standard is defined as ____.
    10·2 answers
  • The international governing body for badminton is the
    7·2 answers
  • Oxygen (O2) is best described as which of the following: An element A compound A mixture
    13·1 answer
  • A monkey throws a banana peel from a height of 14 meters. It has a mass of 0.01 kilogram. What was the approximate potential ene
    8·1 answer
  • Technician A says a that a voltmeter can be used to monitor the output signal of an optical sensor. Technician B says that optic
    15·1 answer
  • Which of the following diagrams represent a balanced force
    13·1 answer
  • It is well known that bullets and other missiles fired at Superman simply bounce off his chest. Suppose that a gangster sprays S
    13·1 answer
  • You connect three resistors with resistances R, 2R, and 3R in parallel. The equivalent resistance of the three resistors will ha
    9·1 answer
  • SEND HELP
    14·1 answer
  • Can uh help in in this question step by step​
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!