Physics

# Which of the following has the time period two seconds specifically :

Seconds pendulum

##### SOLUTION
A seconds pendulum is a pendulum where the period is precisely 2 seconds.
T $= 2\pi \sqrt{\dfrac{L}{g}}$
If $T = 2\$ sec is known, $g$ is known, then $l$ can be defined at a place.

You're just one step away

Single Correct Medium Published on 18th 08, 2020
Questions 244531
Subjects 8
Chapters 125
Enrolled Students 202

#### Realted Questions

Q1 Single Correct Medium
The product $(PV)$ has the dimensions.
• A. ${M^1}{L^{ - 1}}{T^{ - 2}}$
• B. ${M^1}{L^2}{T^{ - 2}}$
• C. ${M^1}{L^2}{T^{ - 2}}$
• D. ${M^1}{L^2}{T^{ - 3}}$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q2 Single Correct Medium
100 square millimetres ($mm^2$ )= ________ square centimetre($cm^2$).
• A. $100$
• B. $10$
• C. $1$
• D. $0.1$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q3 Single Correct Medium
Dimensions of frequency are
• A. $M^0L^{-1}T^0$
• B. $M^0L^0T^{-1}$
• C. $M^0L^0T$
• D. $MT^{-2}$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q4 Single Correct Medium
Using the principle of homogeneity of dimensions, which of the following is correct?
• A. $\displaystyle T^2\,=\,\frac {4\pi ^2 r^3}{GM}$
• B. $\displaystyle T^2\,=\, 4\pi ^2 r^2$
• C. $\displaystyle T^2\,=\,\frac {4\pi ^2 r^3}{G}$
• D. $\displaystyle T\,=\,\frac {4\pi ^2 r^3}{G}$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q5 Subjective Medium
The distance of a galaxy is $56 \times10^{25}m$. Assume the speed of light to be $3\times10^8 m s^{-1}$. Express order of magnitude of time taken by light travelled to the galaxy.

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020