Question

1. Define velocity. 2. What is a null vector? 3. What is the unit of measurement of energy used in our electricity bills? 4. Where is the centre of mass of a meter stick? 5. Name the natural satellite of earth. 6. What is hydraulic stress? 7. Why is the tip of the nib of a pen split? 8. Why some cooking pots have copper coating on the bottom? 9. State the law of equipartition of energy. 10. Define amplitude of a wave.

Answer 1

1 /- Velocity. From Wikipedia, the free encyclopedia. Velocity is a measure of how fast something moves in a particular direction. In other words, a velocity is a speed with a direction. For instance, if an object moves east at 9 metres per second (9m/s), we would say that its velocity is 9 m/s to the east.

2 /- Null vector is a vector with a zero magnitude. Vectors are the elements of vector space having magnitude and direction. ... Additive inverse is one such property of a vector space which is satisfied using the null vector. Null vector is nothing but the identity element of vector space.

Answer 2

1) velocity is the change in displacement of an object with respect to time

2)null vector is the vector with zero magnitude . It is the element of vector space having magnitude and direction