STUDY LESSON:-24 [CIVIL ENGINEERING]
For Competitive exams/Railway jobs/Semester exam/Self Study Purpose
2. If a boy is sitting in a car throws a ball straight up to the air. For what reason does that ball will fall back into his hands __________
3. If a body of a mass 20kg in a rest is subjected to a force of 100 N which acts for 0.5 seconds. What will be the velocity achieved by that body?
4. What will be the gravity of a planet if it has half a mass and half a radius of the earth's surface?
5. Where do we use the application of Williot Mohr diagram?
6. What will be the ratio of the time taken by two ball A and B in a vacuum of different masses of two bodies which are dropped from two different height a and b?
7. If a solid sphere rolls in a horizontal surface then what will be the ratio of its rotational a kinetic energy to its total kinetic energy?
8. If a roller skater dancer suddenly fold her outstretched arms in to the center of her body __________
9. What will happen to the earths day and night duration if the earths radius reduced in to half ?
10. What is the escape velocity of our earth?
Answers:-
1. 1.885 m/sec [ Hint:-Vmax= amplitude x 2πN]
2. due to moving at a constant velocity
3. 2.5 m/s [Hint:- P=ma, V=u+at]
4. 19.6 km/sec²
5. Deflection in Truss
6. √a :√b
7. 2:7
8. Her moment of Inertia will decrease and the speed of rotation will increase.
9. 6 Hours
10. 11 km/sec
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