Answer:
Explanation:
Net electric field at the centre will be zero .
Since all the charges are equal and they all are symmetrically situated around the centre . So the electric field produced by each will cancel out each other and hence the resultant electric field will be zero . It happens because electric field is a vector quantity and therefore it adds up vectorially . All the four electric field will form two pairs , in each pair electric fields are acting in opposite direction . So they all cancel out to zero .
Answer:
Examples include cars, buildings, clothing, and tools. Nonmaterial culture refers to the abstract ideas and ways of thinking that make up a culture. Examples of nonmaterial culture include traffic laws, words, and dress codes.
Answer:
Explanation:
Given
Velocity of traffic 
Maximum value of Centripetal force is one-tenth of weight
such that 
to make a safe turn centripetal force with radius of curvature r is given by
Answer:
Texting and driving is potentially hazardous because it can cause death to yourself as well as someone else, car crashes, or run red lights and causing collisions.
Explanation:
Answer:
When walking towards the back of a bus while it moves forward its apparent velocity seems slower than it actually is with respect to the ground.
Explanation:
- When a someone follows a moving bus from behind by walking then the apparent speed of the bus is slightly slower by the same magnitude as the speed of walking because both are moving in the same direction.
- This is the concept of relative velocity when the apparent velocity of the same object appears different to different viewers at the same time being on different frame of motion.
- When the same bus is observed from a point on the road the speed of the bus will appear greater than the former case discussed above because the bus here is moving with respect to a stationary observer.
