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
bija089 [108]
3 years ago
6

How much heat, in joules and in calories, must be added to a 75.0–g iron block with a specific heat of 0.449 j/g °c to increas

e its temperature from 25 °c to its melting temperature of 1535 °c?
Physics
1 answer:
pav-90 [236]3 years ago
4 0
Note that
1 cal = 4.184 J

Given:
m = 75.0 g, the mass of the iron block
c = 0.449 J/(g-°C), the specific heat of iron
Tm = 1535 °C, melting temperature
T0 = 25 °C, initial temperature.

Sensible heat required to raise the temperature of the iron is given by
Q = mc(Tm - T0)
    = (75 g)*(0.449 J/(g-°C))*(1535 - 25 °C)
    = 50849.25 J = 50.849 kJ

Q = (50849.25 J)*( 1 cal/4.184 J)
    = 12153.3 cal

Answer:
50849.3 J or 12153.3 cal 
You might be interested in
An example of a folkway violation would be driving 70 mph in a 50-mph zone. Group of answer choices True False
shutvik [7]

Answer:

Yes.

Explanation:

That is also a law violation.

3 0
3 years ago
How much energy (in kilojoules) is required to convert 200 mL of diethyl ether at its boiling point from liquid to vapor if its
LiRa [457]

Answer:

55.96kJ

Explanation:

Energy = mass of diethyl ether × enthalpy of vaporization of diethyl ether

Volume (v) = 200mL, density (d) = 0.7138g/mL

Mass = d × v = 0.7138 × 200 = 142.76g

Enthalpy of vaporization of diethyl ether = 29kJ/mol

MW of diethyl ether (C2H5)2O = 74g/mol

Enthalpy in kJ/g = 29kJ/mol ÷ 74g/mol = 0.392kJ/g

Energy = 142.76g × 0.392kJ/g = 55.96kJ

4 0
3 years ago
The main reason that most professional research telescopes are reflectors is that
GuDViN [60]
<h3><u>Answer;</u></h3>

Large mirrors are easier to build than large lenses.

<h3><u>Explanation;</u></h3>
  • <em><u>Reflector telescopes have a number of advantages as compared to refracting telescopes and other types of telescopes. </u></em>
  • <em><u>Reflector telescopes do not suffer from chromatic aberration because all wavelengths will reflect off the mirror in the same way. The support for the objective mirror is all along the back side so they can be made very large.</u></em>
  • Additionally, reflector telescopes are cheaper to make than refractors of the same size. Also since in reflector telescopes light is reflecting off the objective, rather than passing through it, only one side of the reflector telescope's objective needs to be perfect.

7 0
3 years ago
If an object is thrown in an upward direction from the top of a building 1.6 x 10^2 ft. high at an initial velocity of 21.82 mi/
Goshia [24]

If an object is thrown in an upward direction from the top of a building 1.60 x 102 ft. high at an initial velocity of 21.82 mi/h, what is its final velocity when it hits the ground? (Disregard wind resistance. Round answer to nearest whole number and do not reflect negative direction in your answer.)


this question is troubling me i guessed 96 ft/s

can someone help me out and explain it thanks so much!!!!!!



7 0
3 years ago
Read 2 more answers
Help pleasessssssssssssss
irinina [24]

Sorry I had the answer but it wont let me type numbers :(.:

5 0
2 years ago
Other questions:
  • An underwater scuba diver sees the Sun at an apparent angle of 43.0° above the horizontal. What is the actual elevation angle of
    10·1 answer
  • Bohr's model is sometimes called the ________ model because it resembles a mini-solar system.
    12·2 answers
  • What layer is just below the Earth’s crust?
    8·1 answer
  • Does uniform acceleration means increasing acceleration?
    12·1 answer
  • Explain relative velocity.
    6·1 answer
  • A 3.2 kg particle starts from rest at x = 0 and moves under the influence of a single force Fx = 4 + 15.7 x − 1.5 x 2 , where Fx
    15·1 answer
  • HELP ME PLZ I HAVE LIMITED TIME Imagine your teacher asks you to design an experiment where you test the effect of temperature o
    9·1 answer
  • The energy wasted in using a machine is 600j. if the machine is 70% efficient. calculate the volume of water pumb by the machine
    14·1 answer
  • A skydiver reaches terminal velocity. Then he opens his parachute.
    6·2 answers
  • a car advertisement States that a certain car can accelerate from rest to70km/h in 7seconds find the car's average acceleration​
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!