Table:15.1 Image formed by a concave mirror for object placed at different distances from it NCERT SCIENCE CLASS 7CHAPTER NO.15 LIGHT ​Step by step Explanation plz

Answer:

First law of Thermodynamics we have :-

Q= w+ΔU   (1)

where,

Q = Heat supplied to the gas

w = Work done by the gas

ΔU = Change in the internal energy of the gas

Given :-

w= Q/4     (2)

From (1) & (2) we have :-

⟹ΔU= 3Q/4      (3)

Now,

ΔU=  nRΔT/  γ−1    (4)

where,

n = No. of moles of gas  

ΔT = Change in temperature  

R = Universal Gas Constant  

γ = Specific heat ratio  

For a diatomic gas :-

γ=7/5          ( 5)

Using (3), (4) & (5) we get :-

⟹nΔT=  3Q/ 10R       (6)

Also note that :-

Q=nCΔT      (7)

where,  

C = Molar specific heat for the process

So now replace nΔT in (7) by (6) :-

⟹  3QC/  10R    =Q

⟹C=   10R/3

Explanation:

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Answer: D.

Explanation: actually it matters  on his effort the probable options are C. and D.  but since here word trying is used then the most probable option is D.

Answer:

1.Unless you walk slowly,you will fall.

2.Walk slowly otherwise you will fall.

Answer:

Answer:

place value of 2 in the number = 20 [ tens place]

face value of 2 in the number = 2

A.T.G.C.

x percent of 20=2

x/100 *20=2

x=2*100/20

x=10 percent

thus 10%  is the answer.

10 % of place value of 2 is its face value in 68520.

Option (b) is correct.

Given:

• A number 68520.

To find:

• What percent of place value of 2 is its face value in 68520?
• (a)2%
• (b) 10%
• (c) 20%
• (d) 15%

Solution:

Step 1:

Place value of 2 in 68520 is 20.

Face value of 2 in 68520 is 2.

Step 2:

Find the percent of place value of 2 is its face value.

% value [tex] = \frac{\text{Face Value}}{\text{Place value}} \times 100 \\ [/tex]

or

% value [tex] = \frac{2}{20} \times 100 \\ [/tex]

or

% value[tex] = 10 \\ [/tex]

Thus,

10 % of place value of 2 is its face value in 68520.

Option (b) is correct.

Learn more:

1) Find the difference between the place value of 4in 984534875

https://brainly.in/question/19776808

2) Expand the number based on the place value.

(a) 8720435 (b) 549786

https://brainly.in/question/20176375