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
Nookie1986 [14]
3 years ago
12

What minimum heat is needed to bring 250 g of water at 20 ∘C to the boiling point and completely boil it away? The specific heat

of water is 4190 J/(kg⋅K) and its heat of vaporization is 22.6×105 J/kg.
Physics
1 answer:
Amiraneli [1.4K]3 years ago
4 0

Answer:633.8 KJ

Explanation:

Given

mass of water\left ( m\right )=250gm

Initial temperature\left ( T_i\right )=20^{\circ}C

Final temperature \left ( T_f\right )=100^{\circ}C

Specific heat of water \left ( c \right )=4190 J/kg-k

heat of vaporization\left ( L\right )=22.6\times 10^5 J/kg

Heat required for process\left ( Q\right )=heat to raise water temperature from 20 to 100 +Heat to vapourize water completely

Q=mc\left ( T_f-T_i\right )+mL

Q=0.25\times 4190\times \left ( 100-20\right )+0.25\times 22\times 10^5

Q=\left ( 0.838+5.5\right )\times 10^5

Q=6.338\times 10^5J=633.8 KJ

You might be interested in
A linear accelerator uses alternating electric fields to accelerate electrons to close to the speed of light. A small number of
kobusy [5.1K]

Answer:

8.1 x 10^13 electrons passed through the accelerator over 1.8 hours.

Explanation:

The total charge accumulated in 1.8 hours will be:

Total Charge = I x t = (-2.0 nC/s)(1.8 hrs)(3600 s/ 1 hr)

Total Charge = - 12960 nC = - 12.96 x 10^(-6) C

Since, the charge on one electron is e = - 1.6 x 10^(-19) C

Therefore, no. of electrons will be:

No. of electrons = Total Charge/Charge on one electron

No. of electrons = [- 12.96 x 10^(-6) C]/[- 1.6 x 10^(-19) C]

<u>No. of electrons = 8.1 x 10^13 electrons</u>

6 0
3 years ago
PLEASE HELP COME UP WITH 5 MULTIPLE CHOICE QUESTIONS FROM HEALTH RELATED FITNESS AND SKILL RELATED QUESTIONS
Helga [31]

Answer:

1. What is not considered a cardiovascular workout?

A. Jogging

B. Sit ups

C. Jump Ropes

D. Burpees

Explanation:

I am sorry, I am in middle school and I only have one question.

5 0
3 years ago
URGANT!!!!!!! NEED ANSWERS TODAY!!!!
natima [27]
2H2 + O2 = 2H2O + Energy
5 0
2 years ago
a girl pushes a cart to the left with a 100-N force. A boy pushes it to the right with a 50-N force. what is the net force exert
NNADVOKAT [17]

Answer:

50 to the left

Explanation:

150-100: 50 to the left

3 0
2 years ago
Which graph represents a nonlinear relationship? 40 40 40 40 30 30 30 30 20 از مسیر 20 20 20 10 10 10 10 0 0 0 0 2 4 6 0 2 4 6 0
Doss [256]

Explanation:

itu Adalah ekseperiasi Yg sagat

mudah kita megola pelaharan dari mkt

kita igin melamar kerja Apa bila

kita visa mejawab nya degan benar

maka kina di terima jadi kariawan nya

kita terhadap bos harus patuh Dan

tidal pernah melakukan half Yg sgat Kevin

karen tidal boleh

itu lah Yg sya visa di sampaiksn pada kmu brenly

7 0
2 years ago
Other questions:
  • How do you find Net Force?
    15·2 answers
  • What must the charge (sign and magnitude) of a particle of mass 1.49 g be for it to remain stationary when placed in a downward-
    15·1 answer
  • Which takes place as water cycles from the bottom of the pot toward the top?
    9·2 answers
  • Can someone tell me how to find acceleration with only using distance and time? It would be much appreciated
    14·1 answer
  • 24. Every magnet, regardless of its shape, has twoO magnetic charges.O magnetic poles.magnetic fields.O magnetic domains.
    8·1 answer
  • What part of the Milky Way allows for determination of its rotational direction? A. Celestial body B. Galactic body C. Galactic
    13·2 answers
  • HELPP!!!! URGENT!!!!
    11·1 answer
  • Assignment
    12·1 answer
  • What is one watt ? Write the relation of watt with kilowatt , megawatt , and horsepower .​
    13·1 answer
  • Every atom contains a<br> .............. which is positively charged
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!