How many Joules must be added to 45.2 g of iron to raise its temperature from
12.5 °C to 76.8°C?
Answer:
297 J
Step-by-step explanation:
The key to this problem lies with aluminium's specific heat, which as you know tells you how much heat is needed in order to increase the temperature of
1 g
of a given substance by
1
∘
C
.
In your case, aluminium is said to have a specific heat of
0.90
J
g
∘
C
.
So, what does that tell you?
In order to increase the temperature of
1 g
of aluminium by
1
∘
C
, you need to provide it with
0.90 J
of heat.
But remember, this is how much you need to provide for every gram of aluminium in order to increase its temperature by
1
∘
C
. So if you wanted to increase the temperature of
10.0 g
of aluminium by
1
∘
C
, you'd have to provide it with
1 gram
0.90 J
+
1 gram
0.90 J
+
...
+
1 gram
0.90 J
10 times
=
10
×
0.90 J
However, you don't want to increase the temperature of the sample by
1
∘
C
, you want to increase it by
Δ
T
=
55
∘
C
−
22
∘
C
=
33
∘
C
This means that you're going to have to use that much heat for every degree Celsius you want the temperature to change. You can thus say that
1
∘
C
10
×
0.90 J
+
1
∘
C
10
×
0.90 J
+
...
+
1
∘
C
10
×
0.90 J
33 times
=
33
×
10
×
0.90 J
Therefore, the total amount of heat needed to increase the temperature of
10.0 g
of aluminium by
33
∘
C
will be
q
=
10.0
g
⋅
0.90
J
g
∘
C
⋅
33
∘
C
q
=
297 J
I'll leave the answer rounded to three sig figs, despite the fact that your values only justify two sig figs.
For future reference, this equation will come in handy
q
=
m
⋅
c
⋅
Δ
T
, where
q
- the amount of heat added / removed
m
- the mass of the substance
c
- the specific heat of the substance
Δ
T
- the change in temperature, defined as the difference between the final temperature and the initial temperature of the sample
The key to this problem lies with aluminium's specific heat, which as you know tells you how much heat is needed in order to increase the temperature of
1 g
of a given substance by
1
∘
C
.
In your case, aluminium is said to have a specific heat of
0.90
J
g
∘
C
.
So, what does that tell you?
In order to increase the temperature of
1 g
of aluminium by
1
∘
C
, you need to provide it with
0.90 J
of heat.
But remember, this is how much you need to provide for every gram of aluminium in order to increase its temperature by
1
∘
C
. So if you wanted to increase the temperature of
10.0 g
of aluminium by
1
∘
C
, you'd have to provide it with
1 gram
0.90 J
+
1 gram
0.90 J
+
...
+
1 gram
0.90 J
10 times
=
10
×
0.90 J
However, you don't want to increase the temperature of the sample by
1
∘
C
, you want to increase it by
Δ
T
=
55
∘
C
−
22
∘
C
=
33
∘
C
This means that you're going to have to use that much heat for every degree Celsius you want the temperature to change. You can thus say that
1
∘
C
10
×
0.90 J
+
1
∘
C
10
×
0.90 J
+
...
+
1
∘
C
10
×
0.90 J
33 times
=
33
×
10
×
0.90 J
Therefore, the total amount of heat needed to increase the temperature of
10.0 g
of aluminium by
33
∘
C
will be
q
=
10.0
g
⋅
0.90
J
g
∘
C
⋅
33
∘
C
q
=
297 J
I'll leave the answer rounded to three sig figs, despite the fact that your values only justify two sig figs.
For future reference, this equation will come in handy
q
=
m
⋅
c
⋅
Δ
T
, where
q
- the amount of heat added / removed
m
- the mass of the substance
c
- the specific heat of the substance
Δ
T
- the change in temperature, defined as the difference between the final temperature and the initial temperature of the sample
In your case, aluminium is said to have a specific heat of
0.90
J
g
∘
C
.
So, what does that tell you?
Write the equation of the line that passes through the points (-1, 2) and (6, 3) in slope-intercept form.
Answer:
Step-by-step explanation:
Given:
x1 = -1
x2 = 6
y1 = 2
y2 = 3
Solution:
m = ( y2 - y1 ) / ( x2 - x1 )
m = ( 3 - 2 ) / ( 6 - -1 )
m = 1 / ( 6 + 1 )
m = 1/7
Then,
y - y1 = m ( x - x1 )
y - 2 = 1/7 ( x - -1)
y - 2 = 1/7 ( x + 1 )
y - 2 = 1/7x + 1/7
y = 1/7x + 1/7 + 2
y = 1/7x + 15/7
700 people attended a football game. If 20% of the people who attended were teenagers, how many teenagers attended the game?
Plz. Helppp me what the answer???
What is the value of i 20+1?
1
–1
–i
i
Answer:
2
Step-by-step explanation:
i^2 = -1
i^4 = 1
i^20 repeats the cycle 5 times, making i^20 = 1
Answer:
the answer is D) i
Step-by-step explanation: i got it wrong to the bozo who said 1 and it says the answer is i
Amelia is 5 feet tall and casts a 4-foot shadow. A tree next to her casts a 12-foot shadow. The two triangles formed are similar because the angle to the sun is the same. Choose two equations that can be used to find the height, h, of the tree.
The two equations that can be used to find the height are as follows
12 / 4 = h /5
5 / 4 = h / 12
We have given that,
Amelia is 5 feet tall and casts a 4-foot shadow. A tree next to her casts a 12-foot shadow.
What is the similar triangles?Similar triangles are not necessarily the same in size. Corresponding angles of similar triangles are congruent. The sides of a similar triangle are a ratio to each other.
The tree casts a shadow of 12 ft. Let's establish the proportion base on similar triangles. The height of the tree is h. Therefore,
h / 12 = 5 / 4
Therefore, h / 12 = 5 / 4
cross multiply
4h = 60
divide both sides by 4
h = 60 / 4
h = 15 ft
Therefore, the two equations that can be used to find the height are as follows
12 / 4 = h /5
5 / 4 = h / 12
To learn more about the triangle visit:
https://brainly.com/question/17335144
#SPJ1
Answer:
i am on ttm
Step-by-step explanation:
12/4=h/5
5/4=h/12
please help!!!!!
Solve.
−4/9x+2.4=6
Enter your answer as a decimal or as a mixed number in simplest form in the box.
x =
-8.1
Step-by-step explanation:
[tex] \frac{ - 4}{9} x + 2.4 = 6[/tex]
Times all by 9 to get rid of fraction
[tex] - 4x + 21.6 = 54[/tex]
Take 21.6 away from both sides
[tex] - 4x = 32.4[/tex]
Divide by -4
[tex]x = - 8.1[/tex]
Answer: -8 1/10
Step-by-step explanation:
From 93 books to 144 books
51 Books
I think this is what you're looking for?
Find the value of x.
Answer:
Step-by-step explanation:
The line which 3x represents is twice as big as the 48. That's because both sides other than the base are bisected.
3x = 2 * 48
3x = 96 Divide by 3
3x/3 = 96/3 Combine
x = 32
1234567891011121314151617181920
Answer:
What's this question? Oh my gosh!
How many planes appear in the figure?
Answer:
5
Step-by-step explanation:
If the polynomial
[tex] {x}^{19} + {x}^{17} + {x}^{13} + {x}^{11} + {x}^{7} + {x}^{5} + {x}^{3} [/tex]
is divided by (x² + 1), then the remainder is:
(a) 1
(b) x² + 4
(c) -x
(d) x
Please solve this for me. Spam free answer required. Thank you.
Answer:
(C) - xStep-by-step explanation:
Given polynomial:
x¹⁹ + x¹⁷ + x¹³ + x⁷ + x⁵ + x³Group as follows:
(x¹⁹ + x¹⁷) + (x¹³ + x¹¹) + (x⁷ + x⁵) + (x³ + x) - x = x¹⁷(x² + 1) + x¹¹(x² + 1) + x¹⁵(x² + 1) + x(x² + 1) - xAs we see all terms have (x² + 1) as factor apart from the last one.
It means the remainder is - x
Correct choice is C
If a dozen exercise books cost $144, what will 14 of the same books cost? *
Answer:
$168
Step-by-step explanation:
1 dozen = 12
proportions
12 books ⇔ $144
14 books ⇔ $B
B = 144*14/12
B = $168
Kathleen wants to plant a small vegetable garden in her yard. She fences off a rectangular area with a length of 25.75 feet and a width of 10.2 feet. What is the area of Kathleen's vegetable garden?
Answer:
A= L x W
A= 25.75 X 10.2
A= 262.65
Step-by-step explanation:
THE AREA OF KATHLEEN'S VEGETABLE GARDEN
Simplify the expression: 4 + 5(2x - 3) - 6x *
16x + 19
-16x -11
4x -9
4x + 9
Step-by-step explanation:
4+5 (2x-3)-6x
9 (2x-3)-6x
18x-27-6x
12x-27
Answer:
[tex] \sf \: 4x - 11 [/tex]
Step-by-step explanation:
Given expression,
→ 4 + 5(2x - 3) - 6x
Let's simplify the expression,
→ 4 + 5(2x - 3) - 6x
→ 4 + 10x - 15 - 6x
→ (10x - 6x) + (4 - 15)
→ (4x) + (-11)
→ 4x - 11
Hence, the answer is 4x - 11.
Somebody please help
m∠C = 31
m∠D = 83
M∠E = 66
Hope this is helpful!
1. A hot air balloon 4s anchored to the ground by a 152-foot long
rope. The balloon hovers 132 feet above the ground. Which
statement is true?
(a) The angle the rope makes with the ground is about 30"
(B) The angle the rope makes with the ground is about 67
(C) The horizontal distance between the anchor and balloon is about 201 feet.
(D) The horizontal distance between the anchor and the balloon is about 75
foot,
19
Solve this math problem. Correct answer gets brainliest.
Answer:
$28.50
Step-by-step explanation:
21 ÷ 14 = 1.5
19 · 1.5 = 28.50
Hope this helps!!
what is s and what is t?
Answer:
Step-by-step explanation:
S = 2
T = -2
so in S - T = 4. 2 - -2 = 4
IN S + T = 2 S + - 2 = 2
A television set costs $4500 cash. When bought on hire-purchase, a deposit of $450 is
required, followed by 12 monthly payments of $400. How much is saved by paying cash?
Answer:
$750
Step-by-step explanation:
did the problem
Jimmy takes a loan of 10,000$ at 12% per year as rate of interest . Find the amount, he will be required to pay after 1 year to settle the loan .
kindly stay out if u don't know the answer :)
spams , plagiarism = reported
Thanks for answering...
Answer:
1200 I THINK
Step-by-step explanation:
Answer :-
11200Step by step explanation :-
Here,
Principal = 10,000Time = 1 year rate = 12 %The intrest payable on 100$ for 1 year = 12 $
The interest payable on 10,000$ borrowed for 1 year
[tex]( \frac{12}{100} \times 10000)[/tex][tex]1200[/tex]so, at the eand of the year , he has to give an amount of $ ( 10,000 + 1200 )
11200 $ 100 students are interviewed to see which of biology chemistry or physics , they prefer 30 students are girls 16 of the girls like biology 9 of the boys prefer physics 2 out of the 34 who prefer physics are girls what percentage prefer biology
Well, it says that 34 kids like physics and since there is 100 students, we know 34% of the kids like physics. This means 66% like biology.
Which ordered pair is the solution set
for 3x + 5y < 10?
Answer:
Slope is -3/5
Slope intercept form: y<-3/5x+2
Step-by-step explanation:
Your going to have a shaded region, with a dashed line
the y intercept will be (2)
the x intercept will be (3.333,0)
Let's find the unknown variables in the following cases. ) (a) If C.P. Rs 150 and profit = Rs 12, find profit percent
Answer:
solution, cp=Rs150 profit=Rs12 Now, profit percent=profit% of cp or,profit percent=12/100 x Rs150 Therefore,profit percent =18%
Step-by-step explanation:
Answer:
8%
Step-by-step explanation:
We know that
Profit% = Profit/CP × 100
=> 12/150 × 100
=> 12/15 × 10
=> 4/5 × 10
=> 8%
Can someone please help me, i don't understand this work.
Answer: Check out the diagram below for the filled out table
Equation is y = 1.5x
Box for row one = 330
Box for row two = 1000
Box for row three = 1.5
===========================================================
Explanation
x = amount of fish in grams (horizontal axis)y = number of calories (vertical axis)The point (x,y) = (200,300) is on the blue diagonal line. It indicates that x = 200 grams of fish have y = 300 calories. Divide the two values to get the slope
slope = y/x = 300/200 = 1.5
This trick only works because the line is going through the origin. Otherwise, we'd have to use the slope formula.
The slope of 1.5 is the constant of proportionality. It tells us the equation is y = 1.5x. Whatever x is, multiply by 1.5 to get y.
So if x = 220, then y = 1.5x = 1.5*220 = 330
220 grams of fish have 330 calories. We'll write 330 in the box of the first row of the table.
-----------------
We can use this idea in reverse. If we know the calorie count (y), then we can divide by 1.5 to get the number of grams (x).
y = 1.5x
1500 = 1.5x
1.5x = 1500
x = 1500/(1.5)
x = 1000
Therefore, 1000 grams of fish have 1500 calories. We'll write 1000 in the box of the second row.
------------------
The third row of the table is going to follow the same steps as the first row.
y = 1.5x
y = 1.5*1
y = 1.5
One gram of fish produces 1.5 calories
The filled out table is shown below. I've merged the two screenshots you posted into one image, and filled out the boxes.
A line with the slope of -4 passes through the point (8,-3). What is the equation in point slope form
please help me asap ty ty ty ty ty ty ty ty ty ty ty ty ty ty ty ty tyt ty ty
this is like the other question i just posted, but this one is subtraction instead of addition..
Answer:
y = x/2 + -3
Step-by-step explanation:
x - 2y = 6
Subtract x from both sides
-2y = -x + 6
Divide both sides by -2
y = x/2 + -3
Answer:
y = 1/2x - 3
Step-by-step explanation:
Subtract x both sides
-2y = 6 + (-x)
Divide -2 both sides
y = -3 + 1/2x
y = 1/2x - 3
When trying to find the amount of interest you will pay if you borrow money, what three things
must you calculate? Think PRT.
O Partial amount, interest rate, time
O Principal, review, time
O Principal, interest rate, time
O Pay, rate, terms
Please help me with thiss
Answer:
gradient = 2
Step-by-step explanation:
Calculate the gradient (slope) m using the slope formula
m = [tex]\frac{y_{2}-y_{1} }{x_{2}-x_{1} }[/tex]
with (x₁, y₁ ) = (1, 0) and (x₂, y₂ ) = (6, 10) ← 2 points on the line
m = [tex]\frac{10-0}{6-1}[/tex] = [tex]\frac{10}{5}[/tex] = 2
Juan texts 20 messages in 5 minutes. At this rate how many text messages can he send in 30 minutes
The answer 120 MESSAGES
David makes a pizza with 8 slices of equal size . He covers 5 of the 8 slices with pepperoni. What percentage of the pizza is covered with pepperoni
Answer:
5/8 * 100 = 62.5 %