Question
When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.
✓
Answer
Work is said to be done when the force applied on a body produces motion in it.
Work done by a body in moving up is given by:
W = m × g × h
where W is the work done against the gravity.
m = mass of the body.
g = acceleration due to gravity.
Work done by a body in moving up is given by:
W = m × g × h
where W is the work done against the gravity.
m = mass of the body.
g = acceleration due to gravity.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
What are the functions of bones, cartilages, ligaments and tendons?
Why are manure and fertilizers used in fields?
What will happen if: (a) Bone is dpiied in hydrochloric acid (HCI); (b) Bone is dried?
A man is asked to run with a bag containing 20kg steel block. Will it be easier for him to run with 20kg cotton replacing the block. Explain with reason.
Define drought.
Explain the objectives of mixed cropping. How are crops selected for mixed cropping.
Given alongside is the velocity-tine graph for a moving body:
Find:
- Velocity of the body at point C.
- Acceleration acting on the body between A and B.
- Acceleration acting on the body between B and C.
A solution contains 50mL of alcohol mixed with 150mL of water. Calculate the concentration of this solution.
Draw and identify different elements of phloem.
- Identify A and B cells.
- What will happen if B cells are kept in hypotonic solution.
- What will happen if A cells are kept in hypertonic solution.