Work Done as Dot Product
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- Mgd
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- 18.91 kJ
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A small block of mass 2 kg is kept on a rough inclined surface of inclination θ=30∘ fixed in a lift. The lift goes up with a uniform speed of 1 ms−1 and the block does not slide relative to the inclined surface. The work done by the force of friction on the block in a time interval of 2 s is.
Zero
9.8 J
16.9 J
29.4 J
- 1 : 2 : 3
- 1 : 4 : 9
- 1 : 3 : 5
- 1 : 5 : 3
A cord is used to lower vertically a block of mass M by a distance d with constant downward acceleration g4 . Work done by the cord on the block is
Mgd
A force of 5 N acts on a 15 kg body initially at rest. The work done by the force during the first second of motion of the body is
5 J
6 J
A particle of mass 0.01 kg travels along a curve with velocity given by 4^i+16^k ms−1. After some time, its velocity becomes 8^i+20^j ms−1due to the action of a conservative force. The work done on particle during this interval of time is
0.32 J
6.9 J
9.6 J
0.96 J
The mass of a bucket containing water is 10 kg. What is the work done in pulling up the bucket from a well of depth 10 m if water is pouring out at a uniform rate from a hole in it and there is loss of 2kg of water from it while it reaches the top (g=10m/sec2)
1000 J
800 J
500 J
900 J