Two blocks are connected by a string as shown in the diagram. The upper block is hung by another string. A force F applied on the upper string produces an acceleration of 2 m/s² in the upward direction in both the blocks. If T and T’ be the tensions in the two parts of the string, then 

1. T = 70.8 N and T’ = 47.2 N

2. T = 58.8 N and T’ = 47.2 N

3. T = 70.8 N and T’ = 58.8 N

4. T = 70.8 N and T’ = 40.2 N

A block is kept on a frictionless inclined surface with an angle of inclination 'α'. The incline is given an acceleration 'a' to keep the block stationary. Then a is equal to 

1. g

2. gtanα

3. g/tanα

4. gcosecα

A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. If a force P is applied at the free end of the rope, the force exerted by the rope on the block will be: 

1. P

2. $\frac{Pm}{M+m}$

3. $\frac{PM}{M+m}$

4. $\frac{Pm}{M-m}$

Three equal weights A, B and C of mass 2 kg each are hanging on a string passing over a fixed frictionless pulley as shown in the figure The tension in the string connecting weights B and C is 

1. Zero

2. 13 N

3. 3.3 N

4. 19.6 N

Two masses of 4 kg and 5 kg are connected by a string passing through a frictionless pulley and are kept on a frictionless table as shown in the figure. The acceleration of 5 kg mass is

1. 49 m/s²

2. 5.44 m/s²

3. 19.5 m/s²

4. 2.72 m/s²

Two masses 2 kg and 3 kg are attached to the end of the string passed over a pulley fixed at the top. The tension and acceleration are

1. $\frac{7g}{8};\frac{g}{8}$

2. $\frac{21g}{8};\frac{g}{8}$

3. $\frac{21g}{8};\frac{g}{5}$

4. $\frac{12g}{5};\frac{g}{5}$

Three blocks A, B and C weighing 1, 8 and 27 kg respectively are connected as shown in the figure with an inextensible string and are moving on a smooth surface. T₃ is equal to 36 N. Then T₂ is 

1. 18 N

2. 9 N

3. 3.375 N

4. 1.25 N

Two bodies of mass 3 kg and 4 kg are suspended at the ends of massless string passing over a frictionless pulley. The acceleration of the system is (g = 9.8 m/s²) 

1. 4.9 m/s²

2. 2.45 m/s²

3. 1.4 m/s²

4. 9.5 m/s²

Three solids of masses m₁, m₂ and m₃ are connected with weightless string in succession and are placed on a frictionless table. If the mass m₃ is dragged with a force T, the tension in the string between m₂ and m₃ is 

1. $\frac{m_2}{m_1+m_2+m_3}T$

2. $\frac{m_3}{m_1+m_2+m_3}T$

3. $\frac{m_1+m_2}{m_1+m_2+m_3}T$

4. $\frac{m_2+m_3}{m_1+m_2+m_3}T$

Three blocks of masses m₁, m₂ and m₃ are connected by massless strings as shown on a frictionless table. They are pulled with a force T₃ = 40 N. If m₁ = 10 kg, m₂ = 6 kg and m₃ 4 kg, the tension T₂ will be 

1. 20 N

2. 40 N

3. 10 N

4. 32 N