Physics

# The effective length of a simple pendulum is the sum of the following three: length of string, radius of bob, and length of hook.In a simple pendulum experiment, the length of the string, as measured by a meter scale, is $92.0$cm. The radius of the bob combined with the length of the hook, as measured by a vernier callipers, is $2.15$cm. The effective length of the pendulum is

$94.2$cm

##### SOLUTION
Length of the string$=92.0㎝$
Radius of bob+length of hook$=2.15㎝$
Total length$=\left( 92.0+2.15 \right) ㎝$
$=94.15㎝$
Rounding off to first decimal place$=94.2㎝$
Hence, effective length$=94.2㎝$

You're just one step away

Single Correct Medium Published on 18th 08, 2020
Questions 244531
Subjects 8
Chapters 125
Enrolled Students 218

#### Realted Questions

Q1 Subjective Medium
State the number of significant figures in the following:
(a) $0.2370\ gm\ cm^{-3}$
(b) $2.64\times 10^{24} kg$.

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q2 Single Correct Medium
Dimensions of $\dfrac { L }{ RCV }$ are:
• A. ${ A }^{ -1 }$
• B. ${ A }^{ -2 }$
• C. $A$
• D. ${ A }^{ 2 }$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q3 Single Correct Medium

A star has a parallax angle p of 0.723 arcseconds. What is the distance of the star?

• A. 1.38 parsecs
• B. 2.38 parsecs
• C. 3.38 parsecs
• D. 4.38 parsecs

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q4 Single Correct Medium
If a measured quantity has $n$ significant figures, the reliable digits in it are :
• A. n
• B. n-1
• C. 2n
• D. n/2

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q5 Single Correct Medium
In system called the star system we have $1$ star kilogram $=10^{20}kg$. $1$ starmeter $=10^{8}m$, $1$ starsecond $=10^3second$ then calculate the value of $1\,joule$ in this system.
• A. $10^{-30}star\,joule$
• B. $10^{-27}star\,joule$
• C. $10^{-32}star\,joule$
• D. None of these

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020