Question
Which law explains why planets move faster when they are
closer to the Sun?Solution
Kepler's Second Law (Law of Equal Areas) states that a planet sweeps out equal areas in equal time intervals, moving faster when closer to the Sun.
The speed of a boat in still water is 5 km/hr and speed of current is 3 km/hr. If time taken to cover a certain distance upstream is 12 hours, then how ...
The ratio of the speed of boats ‘A’ and ‘B’ in still water is 8:9, respectively. The speed of the current is 25% of the speed of boat ‘A’ in...
The speed of the boat in still water is 10 km/hr and the speed of the stream is 5 km/hr. A boat goes 75 km downstream with its usual speed but at the ti...
A boat can cover ‘y’ km distance downstream in (t+2.5) hours. The same boat can cover ‘0.25y’ km distance upstream in ‘t’ hours. The time ta...
The speed of boat in still water is 48 kmph. If it takes 5 hour to go upstream 40 kms, in what time approximately will it return same distance downstrea...
When travelling downstream, a boat takes 6 hours to travel 240 km. If the speed of the stream is (3/8)th of downstream speed of the boat, the...
A man rows a boat a certain distance downstream in 9 hours, while it takes 18 hours to row the same distance upstream. How many hours will it take him t...
The ratio of the speed of boats ‘A’ and ‘B’ in still water is 8:9, respectively. The speed of the current is 25% of the speed of boat ‘A’ in...
The speed of the boat in still water is 6 km/hr and the speed of the stream is 3 km/hr. A boat goes 54 km downstream with its usual speed but at the tim...
A boat can cover 130 km in downstream in 10 hours and 120 km in upstream in 12 hours. Find the distance travelled by the boat in still water in 4 hours.
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