## WORK ENERGY AND POWER Quiz-3

Work power energy is the most important chapter when it comes to mechanics, for JEE (Advanced). The chapter is quite tricky and takes a lot of time and devotion on your part to understand and master. But this chapter is a complete gold medal for almost all the questions of the mechanics can be solved by the work power energy approach if you master this topic..

Q1.
•
•
•
•
Solution

Q2.
•
•
•
•
Solution

Q3.  Two identical 5 kg blocks are moving with same speed of 2 ms^(-1) towards each other along a frictionless horizontal surface. The two blocks collide, stick together, and come to rest. Consider the two blocks as a system. The works done by external and internal forces are, respectively
•
0, 0
•
0, 20 J
•
0,-20 J
•
20 J,-20 J
Solution

Q4. A shell is fired from a cannon with velocity v m/sec at an angle Î¸ with the horizontal direction. At the highest point in its path it explodes into two pieces of equal mass. One of the pieces retraces its path to the cannon and the speed in m/sec of the other piece immediately after the explosion is
•  3v cos⁡Î¸
•  2v cos⁡Î¸
•  3/2 v cos⁡Î¸
•  √3/2 v cos⁡Î¸
Solution

Q5.In the above question, the net work done by the external forces on the box is
•  300 J
•  Zero
•  3200 J
•  6400 J
Solution
Net work done=+3200 J-3200J=0J

Q6.
•  0.96 m
•  2.96 m
• 3.96 m
•  0.48 m
Solution

Q7.
•  4
•  3
•  2
•  1
Solution

Q8.A nucleus with mass number 220 initially at rest emits an Î±-particle.If the Q value of the reaction is 5.5 MeV, calculate the kinetic energy of the Î±-particle
•  4.4MeV
•  T5.4MeV
•  5.6MeV
•  6.5MeV
Solution
Q9.
•
•
•
•
Solution

Q10.

•  2M
•  M
•  M/2
• M/4
Solution

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