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
-Dominant- [34]
3 years ago
8

A hot-water bottle contains 787 g of water at 75∘C. If the liquid water cools to body temperature (37 ∘C), how many kilojoules o

f heat could be transferred to sore muscles?
Physics
2 answers:
IgorC [24]3 years ago
8 0

Answer:

Q = 787 gr * 1 \frac{cal}{gr C} *(37-75)C = -29906 cal

So then the answer for this case would be 29906 cal but we need to convert this into KJ and we know that 1 cal = 4.184 J and if we convert we got:

29906 cal *\frac{4.184 J}{1 cal}* \frac{1KJ}{1000 J}= 125.127 KJ

Explanation:

For this case we know the mass of the water given :

m = 787 gr

And we know that the initial temperature for this water is T_i =75 C.

We want to cool this water to the human body temperature T_f = 37 C

Since the temperatures given are not near to 0C (fusion point) or 100C (the boling point) we don't need to use latent heat, then the only heat involved for this case is the sensible heat given by:

Q= m c_p \Delta T

Where c_p represent the specific heat for the water and this value from tables we know that c_p =1 \frac{cal}{gr C} for the water.

So then we have everything in order to replace into the formula of sensible heat and we got:

Q = 787 gr * 1 \frac{cal}{gr C} *(37-75)C = -29906 cal

So then the answer for this case would be 29906 cal but we need to convert this into KJ and we know that 1 cal = 4.184 J and if we convert we got:

29906 cal *\frac{4.184 J}{1 cal}* \frac{1KJ}{1000 J}= 125.127 KJ

alexandr402 [8]3 years ago
4 0
<h2>Answer:</h2>

125.007 kJ

<h2>Explanation:</h2>

The quantity of heat (Q) transferable in a heating process is the product of the mass (m) of the object involved, the specific heat capacity of the object and the change in temperature (ΔT). i.e

Q = m x c x Δ T     ------------------------(i)

Where, from the question;

m = mass of water = 787g

c = specific heat capacity of water = 4.18 J/g°C  ---- (a known constant)

ΔT = 75°C - 37°C = 38°C

<em>Substitute these values into equation (i)</em>

Q = 787 x 4.18 x 38

Q = 125007.08 J

<em>Convert to kilojoules;</em>

Q = 125.007 kJ

Therefore, the quantity of heat (in kilojoules) that could be transferred to sore muscles is 125.007

You might be interested in
Identify the palindromic base sequence in the DNA donor molecule shown.
Airida [17]

Explanation:

Since a double helix is formed by two paired antiparallel strands of nucleotides that run in opposite directions, and the nucleotides always pair in the same way (adenine (A) with thymine (T) in DNA or uracil (U) in RNA; cytosine (C) with guanine (G)), a (single-stranded) nucleotide sequence is said to be a palindrome

6 0
2 years ago
Air passing over an airplane's wing travels ____________________, and therefore exerts ____________________ pressure than air tr
Aleksandr [31]
<span>c. faster, less

is the answer
</span>
6 0
3 years ago
Read 2 more answers
Which of these values is equivalent to the change in momentum of
iragen [17]
<span>A. An impulse of a force changes the momentum of a body and has the same units and dimensions as momentum.</span>
3 0
2 years ago
Read 2 more answers
Welding, cutting, or heating in any enclosed spaces involving which of the following metals should be performed with local exhau
sweet [91]

steal aluminum iron

4 0
3 years ago
How did Archimedes measure the mass of the block of gold?
MA_775_DIABLO [31]
Archimedes found a piece of gold and a piece of silver with exactly the same mass. He dropped the gold  into a bowl filled to the brim with water and measured the volume of water that spilled out. Then he did the same thing with the piece of solver. Although both metals had the same mass, the silver gad a larger volume; therefore, it displaced more water than the gold did. That's because the silver was less dense than gold. Afterwards he applied the same method to the crown for the king he served who had got a new crown from a jeweler who gave it to him. Archimedes found a piece of pure gold that had the same mass as the crown. He placed the pure gold chuck and the crown in water, one at a time. The crown displaced more water the piece of gold. Therefore, its density was less than pure gold.  
5 0
2 years ago
Other questions:
  • Winner of five swimming gold medals at the 1988 olympics
    11·1 answer
  • What are the smallest parts that make up matter?
    15·1 answer
  • Which two conditions must exist in order for radiation to occur?
    15·2 answers
  • How is air pressure related to elevation?
    8·1 answer
  • Two velcro-covered pucks slide across the ice, collide and stick to one another. Their interaction with the ice is frictionless.
    8·1 answer
  • A golf ball with an initial angle of 34° lands exactly 240 m down the range on a level course.
    11·2 answers
  • What is the primary ingredient of power yoga?
    13·1 answer
  • 1. An object with a mass of m is thrown straight up near the surface of the earth. While the object is going up, the net force o
    11·1 answer
  • One strategy in a snowball fight is to throw
    8·1 answer
  • What type of mirror can produce both<br> converging and diverging rays?
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!