Explain why, when it is getting dark at night, it is impossible to make out the colour of cars on the road.

Because initially they had to apply force to set the card in motion but once the car started rolling,they had to apply force only to balance rolling friction of the...

(a), (d) (a) light scattered into this region interfere destructively.  (d) angle made at the eye by the scattered rays with respect to the incident light of the sun lies between approximately...

In one revolution, the roller will cover an area equal to its lateral surface area. Thus, in 1 revolution, area of the road covered = 2πrh = 2 x (22/7) x...

Let the distance represented on the map be x cm. The given information in the form of a table is as follows. Distance covered on road in (in km) 18 72 Distance represented on map...

Relative speed of cars = 45km/h, time required to meet = 36 km/45km/h = 0.80h Thus, distance covered by the bird = 36 km/h × 0.8h = 28.8 km.

(a) It can be done by adding a strip of blue litmus paper into a tube containing a small amount of sample water if the colour changes into red, this...

When we see in a completely dark room, we are not able to see anything because there is no light in the dark room.  (a) We can see bulb due to...

Planets appear to be quite big to us and can be considered to be a collection of a very large number of point sources of light. The dimming effect produced...

A ship crossing international date line from West to East gains a day. It repeats a day. A day is subtracted from the calendar. So when it is Wednesday mid-night...

1. People who work together to make cars work in the large- scale industry.  2. The USA and China are strong because they have thousands of industries.  3. Nepal has few industries.  4....