As shown in the figure, two masses of 10 kg and 20 kg, respectively are connected by a massless spring. A force of 200 N acts on the 20 kg mass. At the instant shown, the 10 kg mass has an acceleration of 12 m/s2 towards the right. The acceleration of 20 kg mass at this instant is:
1. 12 m/s2
2. 4 m/s2
3. 10 m/s2
4. Zero
What is the acceleration of block A, if the acceleration of B is 4 towards the right at the instant shown?
1. \(2.5~m/s^2\)
2. \(4~m/s^2\)
3. \(5~m/s^2\)
4. Zero
Three blocks A, B and C of mass 3M, 2M and M respectively are suspended vertically with the help of springs PQ and TU and a string RS as shown in fig. The acceleration of blocks A, B and C are respectively.
The value of acceleration \(a_{1}\) at the moment string RS is cut will be:
1. g downward
2. g upward
3. more than g downward
4. zero
Calculate the reading of the spring balance shown in the figure: (take \(g=10\) m/s2)
1. \(60\) N
2. \(40\) N
3. \(50\) N
4. \(80\) N
\(l_1\) and \(l_2\) when stretched with a force of 4 N and 5 N respectively. Its natural length is?
The length of a spring is1. | \(l_2+l_1\) | 2. | \(2(l_2-l_1)\) |
3. | \(5l_1-4l_2\) | 4. | \(5l_2-4l_1\) |