45
75
20
10
A particle of mass m is projected with velocity v making an angle of 450 with the horizontal.When the particle lands on the level ground the magnitude of the change in its momentum will be
2 mv
mv / √2
mv √2
zero
A car runs at a constant speed on a circular track of radius 100 m, taking 62.8 s for every circular lap. The average velocity and average speed for each circular lap respectively is
0,0
0,10 m/s
10m/s,10m/s
10m/s,0
cos-1 (0.6)
A boat is sent across a river with a velocity of 8km-1.If the resultant velecity of boat is 10kmh-1,then velocity of river is
12.8kmh-1
6kmh-1
8kmh-1
10kmh-1
The circular motion of a particle with constant speed is
simple harmonic but not periodic
periodic and simple harmonic
neither periodic nor simple harmonic
periodic but not simple harmonic
00
450
900
1800
P is the point of contact of a wheel and the ground .The radius of wheel is 1m .The wheel rolls on the ground without slipping .The displacement of point p when wheel completes half rotation is
2m
πm
A bus is moving on a straight road towards north with a uniform speed of 50 km/h .If the speed remains unchanged after turning through 900,the increase in the velocity of bus in the turning process is
70.7 km/h along south - west direction.
50 km/h along west
70.7 km/h along north- west direction
