A body of mass 100 g is sliding on an inclined plane with inclination of 300. what is the frictional force experienced, if the coefficient of friction (μ) is 1.7?
A string of length l fixed at one end carries a mass 'm' at the other end. The string makes around the horizontal axis through the fixed end as shown in the figure.
The tension in the string is
16 ml
4 ml
8 ml
2 ml
When milk is churned, cream gets seperated due to
Centripetal force
Centrifugal force
Frictional force
Gravitational force
Consider a car moving along a straight horizontal road with a speed of 72 km/hr.If the coeffecient of static friction between the tyres and the road is 0.5,the shortest distance in which the car can be stopped is
(Take g = 10 m/s2)
30 m
40 m
72 m
20 m
Two iron blocks of equal mass but with double surface area slide down an inclined plane with friction coefficient μ.If the first block with surface area A experience a frictional force f, then the second block with surface area 2A will experience a frictional force
f/2
f
2f
4f
Two balls of mass 1 kg and 2kg respectively are connected to the two ends of the spring. The two balls are pressed together and placed on a smooth table. When released the lighter ball moves with acceleration of 2ms-2. The acceleration of the heavier ball will be
4ms-2
2ms-2
1ms-2
0.5ms-2
A mass of 1 kg is suspended by a thread. It is
i) lifted up with an acceleration 4.9 m/s2
ii) lowered with an acceleration 4.9 m/s2
The ratio of the tensions is
1:3
1:2
3:1
2:1
A ball is dropped from a spacecraft revolving the earth at a height of 120 km.What will happen to the ball?
It will continue to move with same speed along the original orbit of spacecraft
It will move with the same speed, tangentially to the spacecraft
It will fall down to the earth gradually
It will go very far in the space
What should be the tension in a rope pulling vertically upward a mass of 100 kg so that starting from rest it acquires a velocity of 4 m/s in 1.5 seconds?
1278 N
1247 N
1287 N
1894 N
A man is standing on a spring platform. Reading of spring balance is 60 kg wt. If man jumps outside from the platform, then reading of spring balance will
increase
become zero
remain same
first (a) and then (b)
