Fill in the Blanks
1. The nature of work is positive when the force and displacement are in the __________ direction.
2. The dot product of force and velocity is called __________.
3. Work is __________ product of force and displacement.
4. Power is a __________ quantity.
5. Work is a __________ quantity.
6. When the force and displacement are in the same direction then the work is __________.
7. When the force and displacement are in the same direction then the work is __________.
8. The ability of a body to perform the work is called its __________.
9. The rate of doing work of a body is called its __________.
10. Work energy equation is simply the law of conservation of __________.
11. One joule is equal to __________ erg.
12. The unit of power is __________.
13. The unit of energy of elementary particles and atoms is __________.
14. The energy possessed by a body by the virtue of its motion is called the __________ energy.
15. The potential energy of a body is due to its change of __________.
16. The work done against the gravitation field is always __________.
17. The law of conservation of energy states that __________ can neither be created nor destroyed but it can changed its form.
18. The rate of change of momentum multiplied by displacement is called __________.
19. Work done in the gravitation field is __________ of the path followed.
20. Work done in the gravitation field along a closed path is equal to __________.
21. The source of tidal energy is the rotation of the earth around the __________.
22. The source of geothermal energy is the __________ in the earth’s interior.
23. The source of nuclear energy is __________ in heavy nucleus.
24. Einstein mass energy equation is E = __________.
25. The unit of energy is the same as the unit of __________.
26. The dimensions of work are __________.
27. ML2T-3 are the dimensions of __________.
28. The rate of expenditure of energy is called __________.
29. The amount of work done in lifting a body from the surface of the earth to the zero point is called __________ energy.
30. One horsepower is equal to __________ watt.
31. One horsepower is equal to __________ ft.lb/s
32. The expression for absolute gravitational potential energy is __________.
33. 1 electron volt = joule.
34. 1 giga watt (GW) = __________ W.
35. 1 Kilowatt hour (1kWh) = __________ joules.
sely p�ri����he __________ of the radius of the earth.
24. If the mass of earth becomes four times then the value of ‘g’ will be __________.
25. The acceleration due to gravity on moon is __________ the acceleration due to gravity on the surface of the earth.
26. Acceleration due to gravity at the centre of the earth is __________.
27. The weight of a body at the pole is __________ than at equator.
28. The gravitational pull at equator is __________ than at poles.
29. The force required to prevent a body from falling or accelerating in a frame of reference is called the __________ of the body.
30. An astronaut in a satellite orbiting around the earth experiences a state of __________ because the satellite orbiting with a centripetal acceleration equal to ‘g’.
31. Artificial gravity is produced in the satellite to overcome the __________ in the satellite.
32. Artificial gravity is produced in the satellite by __________ it about its own axis.
33. The value of the average density of the earth is __________ kg/m3.
34. The dimension of gravitation constant is __________.
35. The expression for the frequency of rotation of the satellite to produce artificial gravity is __________.