11. 15
A particle of mass 1kg is projected at an angle of 30 degrees with horizontal with a velocity of 40m/s. The change in linear momentum of the particle after a tym t=1s is....
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UP 0 DOWN 0 0 9
9 Answers
11arrey
use vectors in case of any problems
set the coordinates and work ur answer !!!!!!!!
13A strip of wood of mass M and length L is placed on a smooth horizontal surface. An insect of mass m starts at one end of the strip and walks to the other end in tym t , moving the constant speed.
The speed of insect as seen from ground is less than l/t
how??
13dude i did tht ...
√((20√3)^2 + 10^2) - 40*1
but thts not the ans...
13i want to noe ki jo maine kiya hai usmein galat kya hai....?
1can we think like this . momentum does not change along the x-axis.
and along the y-axis it changes with magnitude = 20- (9.8)*1
= 10
hence change inlinear momentum is 10
9if V is vel of insect wrt plank (V =L/t)
U is vel of plank in opp direction
vel of insect wrt grd = V - U < V <L/t