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Aleksandr-060686 [28]
4 years ago
10

Ok, so I've answered this question but I really need someone to just check through it because I have this feeling that I've done

it wron

Physics
2 answers:
bonufazy [111]4 years ago
5 0
Your fill-ins for the first three lines of the table are correct.  Good work.

You have all the same answers for the last 2 lines of the table, like
it makes no difference to anything whether S2 is open or closed. 
That's not correct. It does make a difference.  If S2 is closed, then
the current would much rather go through S2 than through the bulbs
C and D because it's so much easier, and that's exactly what it does.
When S2 is closed, bulbs C and D are off. 

But I'll say again:  Except for those two middle boxes on the bottom line
of the table, everything else is correct.  That's 12 correct fill-ins for you,
and only 2 incorrect ones.  That's a score of 86% !  After posting so many
of these on Brainly this afternoon, doesn't it feel great to do your own work
for a change, and get it almost all correct ?
olga_2 [115]4 years ago
4 0
I believe you are correct
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They want a mixture of 150 grams of water at 60 degrees Celsius, using hot water at 90 degrees Celsius and cold water at 14 degr
Gnesinka [82]

Answer:

Explanation:

Here,

Final mass(m)=150g

Final Temperature(t)=60°C

Temperature of hot water(t1)=90C

Temperature of cold water(t2)=14C

Let the grams of water to be used per face be m1 grams and (150-m1) grams for hot and cold water respectively.

We know that,

Heat lost by hot body=Heat gained by cold body

or, m1 s1 Δt1=m2 s2 Δt2

or, m1 (t1-t)=(150-m1) (t-t2)  [∵s1=s2, SHC of water is taken to be same]

or, m1 (90-60)=(150-m1) (60-14)

or, 30m1=6900-46m1

or, 76m1=6900

∴m1=90.79g

(150-m1)=59.21g

Hence, 90.79g and 59.21 g hot and cold water must be used respectively.

6 0
3 years ago
Select the correct answer.
Liono4ka [1.6K]

Answer: The electromagnetic waves reach Earth, while the mechanical waves do not.

Explanation:

7 0
3 years ago
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Flexibility is defined as A: bending too much and not reaching your goals because of it. B: changing your approach or trying a d
Alex_Xolod [135]
It’s definitely D: seeing all the options available to you and giving one a try
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A plane is a curved surface. true or false
inysia [295]
It is false it has straight sirface
6 0
3 years ago
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A ball of mass 0.6 kg flies through the air at low speed, so that air resistance is negligible. What is the net force acting on
Anettt [7]

To solve this problem we will apply Newton's second law. The second law says that mass by acceleration is equivalent to the Force exerted on a body. Mathematically this

F = ma

Here,

m = mass

a = Acceleration

The ball flies through the air under the effect of gravity only. Therefore the acceleration is due to gravity, we have that

a = - g

Then,

F = -mg

Replacing

F = -0.6*9.8

F = -5.88N

The negative sign implies that the force acting on the ball is in the downward direction that is towards the negative y direction.

5 0
3 years ago
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