A horizontal force \(10~\text N\) is applied to a block \(A\) as shown in figure. The mass of blocks \(A\) and \(B\) are \(2~\text{kg}\) and \(3~\text{kg}\), respectively. The blocks slide over a frictionless surface. The force exerted by block \(A\) on block \(B\) is :
Question 2.
A ball of mass \(0.15~\text{kg}\) is dropped from a height \(10~\text{m}\), strikes the ground, and rebounds to the same height. The magnitude of impulse imparted to the ball is \((g=10 ~\text{m}/\text{s}^2)\) nearly:
Question 3.
Two bodies of mass, \(4~\text{kg}\) and \(6~\text{kg}\), are tied to the ends of a massless string. The string passes over a pulley, which is frictionless (see figure). The acceleration of the system in terms of acceleration due to gravity (\(g\)) is:
Question 4.
A truck is stationary and has a bob suspended by a light string in a frame attached to the truck. The truck suddenly moves to the right with an acceleration of \(a.\) In the frame of the truck, the pendulum will tilt:
Question 5.
A block of mass \(m\) is placed on a smooth inclined wedge \(ABC\) of inclination \(\theta\) as shown in the figure. The wedge is given an acceleration '\(a\)' towards the right. The relation between \(a\) and \(\theta\) for the block to remain stationary on the wedge is:
Question 6.
A balloon with mass \(m\) is descending down with an acceleration \(a\) (where \(a<g\)). How much mass should be removed from it so that it starts moving up with an acceleration \(a\)?
Question 7.
Three blocks with masses \(m\), \(2m\), and \(3m\) are connected by strings as shown in the figure. After an upward force \(F\) is applied on block \(m\), the masses move upward at constant speed \(v\). What is the net force on the block of mass \(2m\)? (\(g\) is the acceleration due to gravity)
1.
\(2~mg\)
2.
\(3~mg\)
3.
\(6~mg\)
4.
zero
Question 8.
A person of mass \(60\) kg is inside a lift of mass \(940\) kg and presses the button on the control panel. The lift starts moving upwards with an acceleration of \(1.0~\text{ms}^{-2}\). If \(g=10~\text{ms}^{-2}\), the tension in the supporting cable is:
Question 9.
The mass of a lift is \(2000\) kg. When the tension in the supporting cable is \(28000\) N, then its acceleration is:
(Take \(g=10\) m/s2)
Question 10.
A 0.5 kg ball moving with a speed of 12 m/s strikes a hard wall at an angle of with the wall. It is reflected with the same speed and at the same angle. If the ball is in contact with the wall for 0.25 s, the average force acting on the wall is:
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Question 1.
A monkey weighing \(20\) kg is holding a vertical rope. The rope will not break when a mass of \(25\) kg is suspended from it but will break if the mass exceeds \(25\) kg. What is the maximum acceleration with which the monkey can climb up the rope? (\(g = 10\) m/s2)
Question 2.
A man weighs 80 kg. He stands on a weighing scale in a lift that is moving upwards with a uniform acceleration of 5m/s2. What would be the reading on the scale? (g = 10 m/s2)
Question 3.
If a lift of mass 1000 Kg is moving with an acceleration of 1 m/s2 in an upward direction, then the tension developed in the string that is connected to the lift is:
Question 4.
A 1 kg stationary bomb explodes in three parts having mass 1 : 1 : 3 respectively. If parts having the same mass move in a perpendicular direction with a velocity of 30 m, then the velocity of the bigger part will be:
Question 5.
A body of mass 3 kg hits a wall at an angle of 60º & returns at the same angle. The impact time was 0.2 s. Calculate the force exerted on the wall.
Question 6.
A mass of 1 kg is thrown up with a velocity of 100 m/s. After 5 seconds, it explodes into two parts. One part of mass 400 g comes down with a velocity of 25 m/s. Calculate the velocity of the other part.
Question 7.
A small ball is suspended from a thread. If it is lifted up with an acceleration of \(4.9\) ms–2 and lowered with an acceleration of \(4.9\) ms–2, then the ratio of the tension in the thread in both cases will be:
Question 8.
If force \(F=500-100t,\) then the function of impulse with time will be:
Question 9.
If a ladder is not in a balanced condition against a smooth vertical wall, then it can be brought to a balanced condition by:
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