Physics

# Subtract $0.2\;J$ from $7.26\;J$ and express the result with correct number of significant figures.

7.1 J

##### SOLUTION
Rule: In addition or subtraction, the final result should retain as many decimal places as are there in the number with the least decimal places.
Arithmetic subtraction $= 7.06 J$
But least precise measurement $0.2 J,$ is correct to only one decimal place.
So final result $=7.1 J$

You're just one step away

Single Correct Medium Published on 18th 08, 2020
Questions 244531
Subjects 8
Chapters 125
Enrolled Students 199

#### Realted Questions

Q1 Single Correct Medium
There are $n\ sets$ of real numbers. In every set there are four real numbers in AP. Such that the square of the last term is equal to the sum of the square of the first three terms. Then: -
• A. $N = 4$
• B. $N = 1000$
• C. $N = 10$
• D. $N \rightarrow \infty$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q2 Single Correct Medium
'Albedo' is
• A. Reflecting power of a heavenly body
• B. Transmitted power of a heavenly body
• C. Absorption power of a heavenly body
• D. Refracting power of a heavenly body

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q3 Single Correct Medium
A wire length of $l= 6\pm 0.06\ cm$ and radius $r= 0.5\pm 0.005\ cm$ and mass $m= 0.3\pm 0.003\ g$ Maximum percentage error is density is:
• A. $4\%$
• B. $2\%$
• C. $1\%$
• D. $6.8\%$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q4 Single Correct Medium
The dimension of stopping potential $V_0$ in photoelectric effect in units of Planck's constant '$h$', speed of light '$c$' and Gravitational constant '$G$' and ampere $A$ is:
• A. $h^{-2/3}c^{-1/3}G^{4/3}A^{-1}$
• B. $h^{2}G^{3/2}c^{1/3}A^{-1}$
• C. $h^{0}c^{5}G^{-1}A^{-1}$
• D. $h^{1/3}G^{2/3}c^{1/3}A^{-1}$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q5 Single Correct Medium
How many order of magnitude are there in one million?
• A. 5
• B. 4
• C. 6
• D. None of above

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020