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CBSE Class 11-science Answered

Rain is falling vertically with speed of 30 m/s. A woman rides a bicycle with a speed of 10 m/s in N to S direction. In which direction she should hold the umbrella?
Asked by Topperlearning User | 23 Apr, 2014, 07:44: AM
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Answered by | 23 Apr, 2014, 09:44: AM

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CBSE 11-science - Physics
What is relative velocity
Asked by dibyanshubehera2727 | 02 Jul, 2021, 07:28: AM
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CBSE 11-science - Physics
According to relative velocity formula we know that when two bodies move towards each other the relative velocity is equal to the sum of two velocities. Then why in calculating upstream where the direction of velocity of stream is against the direction of velocity of boat in still water we subtract the former from the latter even when they are opposite to each other? 
Asked by ahanaganguly55 | 28 May, 2021, 03:59: PM
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CBSE 11-science - Physics
A jet airplane traveling at the speed of 500 km/hr ejects its products of combustion at the speed of 1500 km/hr relative to the jet plane. What is the speed of the later with respect to an obserever on the ground? 
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 11-science - Physics
Two ships A and B strat together from the same point. A sails 16 km/h towards east and B sails 20 km/h towards north. Find the relative velocity of B w.r.t A and distance between them after 5 hours.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 11-science - Physics
Two trains are moving in the opposite directions on parallel tracks, one with a velocity twice that of other. If the total length of the two trains is 480 ft and they take 3 seconds to cross each other, find their individual velocities.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 11-science - Physics
In a harbour, wind is blowing at the speed of 72 km/h and a flag on the mast of the boat anchored in the harbour along the N-E direction. If the boat starts moving at a speed of 51 km/h to the north, what is the direction of the flag on the mast of the boat.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 11-science - Physics
Two trains A and B of length 400 m each are moving on two parallel tracks with a uniform speed of 72 km/hr in the same direction, with A ahead of B.The driver of B decides to overtake A and accelerates by 1 m/s2 . If after 50s, the guard of B just brushes past the driver of A, what was the original distance between them?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 11-science - Physics
Two cars A and B are moving with same speed 30 km/hr in same direction with car B 5 km behind the car A. Another car C moving in opposite direction crosses the two cars at an interval of 4 minutes. Find the speed of car C.
Asked by Topperlearning User | 23 Apr, 2014, 07:19: AM
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CBSE 11-science - Physics
Two cars A and B are travelling in same direction with speed v1 and v2 respectively (v1 > v2 ). When car A is d distance behind the car B, the brakes on A are applied, causing retardation . Show that to prevent a collision between A and B it is necessary that (v1 > v2 )2 < (2d)
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 11-science - Physics
A ship moves along equator to the east with velocity 30 km/hr. The southeastern wind blows at an angle of 60o  to equator with velocity 15 km/hr. Find the wind velocity relative to ship and angle between the equator and the wind direction in reference frame fixed to the ship.
Asked by Topperlearning User | 23 Apr, 2014, 07:39: AM
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