Can displacement be grater than distance travelled by an object?

Can an object have kinetic energy even if its momentum is zero? Explain.

Under what condition will the distance and displacement of a moving object have the same magnitude?

Which of the following true for displacement? (a) It cannot be zero. (b) Its magnitude is greater than the distance travelled by the object. (c) displacement may or may not be equal to distance

Arrange the following compounds in the decreasing order of reactivity towards S_N2 displacement reaction and give reasons in support of your answer: C_2H_5Br , C_2H_5I , C_2H_5Cl

In Class VII you have learnt that in the process of digestion the food gets pushed through the alimentary canal. Could it be a muscular force that does it? You also know that lungs expand and contract while we inhale and exhale air during breathing. Where are these muscles located which make breathing possible? Can you list a few more examples of the force excerted by the muscles in our body?

Show with example how an accelerating body can have zero velocity.

Can a body have a charge of 1.8 xx 10^(-19) C ? Justify your answer .

Consider an optical communication system operating at lambda = 800 nm. Suppose only 1% of optical source frequency is the available channel bandwidth for optical communication. How many channels can be accomodated for transmitting Video TV signals requiring an approximate bandwidth of 4.5 MHz? Support your answer with suitable calculations.

The distance x of a particle moving in one dimension, under the action of constant force is related to time t by equation. t = sqrt x + 3 where x in metre and t in second. Find the displacement of the particle when its velicity is zero.