Question
Consider the following statements about static
electricity: (I) It is the electricity built up on the surface of a substance. (II) It is generated by power plants and batteries. (III) Static electricity is uncontrolled.Solution
Static electricity is the buildup of an electric charge on the surface of objects, which typically occurs through contact or friction between materials. Unlike current electricity, it is not generated by power plants or batteries and is often uncontrolled, leading to sudden discharges like sparks.
- A boat moves at a speed of 11 km/hr in still water, while the current speed is 5 km/hr. If it takes a total of 20 hours to go βxβ km both upstream and ...
Nobita can row from a point A against a current for 30 minutes and then come back in favour of the current for the next 30 minutes and comes to the poin...
A boat can cover βyβ km distance downstream in (t+2.5) hours. The same boat can cover β0.25yβ km distance upstream in βtβ hours. The time ta...
A boat travels 315 km downstream in 7 hours and 135 km upstream in 9 hours. Determine the total time the boat takes to cover 150 ...
The speed of boat 'X' in upstream is 18 km/hr and speed of boat 'Y' in downstream is 30 km/hr. If the difference between speeds of boat 'X' and 'Y' in s...
Find the total distance covered by boat in each upstream and downstream in 6 hours if the speed of boat in still water and speed of current is 15 km/h a...
- A boatβs speed in still water is to the streamβs speed as 7:2. If the boat covers 50.4 km downstream in 96 minutes, find its upstream speed.
The Ship's speed in calm water exceeds that of the current by 20%. After sailing downstream for 4 hours, it traveled upstream for 4 hours with an increa...
The speed of the stream is 10 km/h. Boat βAβ covers 180 km distance against the stream in 6 hours and boat βBβ covers 90 km distance against the...
The speed of current is 10 km/hr. If the speed of the boat in still water had been 8 km/hr more than the original speed, then it would take 7 hours to c...