#1. Number of ergs contained in one joule is ________.
#2. Kinetic and potential energies of a body are the components of it's __________ energy .
#3. Number of joule contained in 1 KW- hr is ________.
#4. The time rate at which work is done or energy is transferred is called _____.
#5. A block of mass 50 kg just slides over a horizontal distance of 1m. If Coefficient of friction between their surface is 0.2,the work done against friction is _________.
#6. Work is said to be positive on the body when the angle between force and displacement is ___________.
#7. A position dependent force F = 7-2X + 3x2 N acts on a small body of mass 2kg and displaces it from x = 0 to x = 5m. The work done in joules is ____.
#8. It is easier to draw up a wooden block along an inclined plane than to haul it vertically principally because ________.
#9. A spring of force constant 800 N/m has an extension of 5 cm. The work done in extending it from 5 cm to 15 cm is :
#10. When two equal masses undergo a glancing elastic collision with one of them at rest, after the collision, they will move at ________ to each other.
