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Physics Question: bank - set 4

                                              Physics Question bank - set 4

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Solving these problems will help you strengthen your base and understanding.

1) A body of mass 5 kg is acted upon by two perpendicular forces 8 N and 6 N.
Give the magnitude and direction of the acceleration of the body.

2) Two masses 8 kg and 12 kg are connected at the two ends of light string that goes over a frictionless pulley.Find the acceleration of the masses and the tension in the string, when the masses are released.

3) A body of mass 6 kg is acted upon by a force which causes a displacement in it given by x=t^2/4  meter, where t=time in second. Calculate the work done by the force in 2 seconds.


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4) If a person can throw a stone to maximum height of H meter vertically, then find out the maximum distance through which it can be thrown horizontally by the same person .

5) The cricket ball of mass 0.25 kg with speed 10 m/s collides with a bat and returns with same speed within 0.01 sec. Find out the force acted on the bat.

6) A particle is moving with a constant speed v in a circle. What is the magnitude of of avg velocity after half rotation?

7) A particle of mass 0.5 kg travels in a straight line with velocity 

  $V=ax^{3/2}$  , where   $a=5 m^{-1/2}s^{-1}$ . What is the work done by the net force during displacement from x=0 to x=2 mtr.

8) An elastic spring of negligible mass has a force constant k=4 N/mtr. One end of the spring is fixed to the wall and the other end touches  a block of mass m = 250 kg placed on a horizontal surface. The spring is compressed by an amount x=5 cm. The coeff of friction between the block and the horizontal surface is (mu) = 0.2. If the system is released , then find the speed of the block when it leaves the spring.  (hints: PE=KE+ (-ive work by friction)

9) The weight of a body on surface of earth is 12.6 newton. Calculate its weight when it's raised to a height half the radius of earth.      (ans: 5.6 N)
10) A rocket of mass 100 kg burns 0.1 kg of fuel per second. If velocity of exhaust gas is 1 km/sec, then what is the acceleration of the rocket?


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