1
JEE Main 2022 (Online) 26th June Morning Shift
+4
-1

Time period of a simple pendulum in a stationary lift is 'T'. If the lift accelerates with $${g \over 6}$$ vertically upwards then the time period will be :

(Where g = acceleration due to gravity)

A
$$\sqrt {{6 \over 5}} T$$
B
$$\sqrt {{5 \over 6}} T$$
C
$$\sqrt {{6 \over 7}} T$$
D
$$\sqrt {{7 \over 6}} T$$
2
JEE Main 2022 (Online) 24th June Evening Shift
+4
-1

Two massless springs with spring constants 2 k and 9 k, carry 50 g and 100 g masses at their free ends. These two masses oscillate vertically such that their maximum velocities are equal. Then, the ratio of their respective amplitudes will be :

A
1 : 2
B
3 : 2
C
3 : 1
D
2 : 3
3
JEE Main 2021 (Online) 1st September Evening Shift
+4
-1
A mass of 5 kg is connected to a spring. The potential energy curve of the simple harmonic motion executed by the system is shown in the figure. A simple pendulum of length 4 m has the same period of oscillation as the spring system. What is the value of acceleration due to gravity on the planet where these experiments are performed?

A
10 m/s2
B
5 m/s2
C
4 m/s2
D
9.8 m/s2
4
JEE Main 2021 (Online) 31st August Evening Shift
+4
-1
A bob of mass 'm' suspended by a thread of length l undergoes simple harmonic oscillations with time period T. If the bob is immersed in a liquid that has density $${1 \over 4}$$ times that of the bob and the length of the thread is increased by 1/3rd of the original length, then the time period of the simple harmonic oscillations will be :-
A
T
B
$${3 \over 2}$$T
C
$${3 \over 4}$$T
D
$${4 \over 3}$$T
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