A metal sphere is suspended from a wall by a string. The forces acting on the sphere are shown in the figure. Which of the following statements is NOT correct?
1. |
\(\vec N+\vec T+\vec W=0\) |
2. | \(T^2=N^2+W^2\) |
3. | \(T = N + W\) | 4. | \(N = W \tan \theta\) |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
Calculate the reading of the spring balance shown in the figure: (take \(g=10\) m/s2)
1. \(60\) N
2. \(40\) N
3. \(50\) N
4. \(80\) N
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
In the diagram, a 100 kg block is moving up with constant velocity. Find out the tension at point P.
1. 1330 N
2. 490 N
3. 1470 N
4. 980 N
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
If a young man of mass 60 kg stands on the floor of a lift which is accelerating downwards at 1 , then the reaction of the floor of the lift on the man will be: (g=9.8)
1. | 528 N | 2. | 540 N |
3. | 546 N | 4. | None of these |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
If between block A and inclined plane is 0.5 and that between block B and the inclined plane is 0.8, then the normal reaction between blocks A and B will be:
1. 180 N
2. 216 N
3. 0
4. None of these
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
A particle is on a smooth horizontal plane. A force F is applied, whose F-t graph is given.
Consider the following statements.
a. At time , acceleration is constant.
b. Initially the particle must be at rest.
c. At time , acceleration is constant.
d. The initial acceleration is zero.
Select the correct statement(s):
1. | (a), (c) | 2. | (a), (b), (d) |
3. | (c), (d) | 4. | (b), (c) |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
A coin placed on a rotating table just slips if it is placed at a distance 4r from the center. On doubling the angular velocity of the table, the coin will just slip when the distance from the centre is equal to:-
1. 4r
2. 2r
3. r
4.
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
A massless string of length 1 m fixed at one end carries a mass of 2 kg at the other end. The string makes rev/s around the axis through the fixed end as shown in the figure. The tension on the string will be:
1. | 32 N | 2. | 3 N |
3. | 16 N | 4. | 4 N |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
Three blocks A, B and C of mass 3M, 2M and M respectively are suspended vertically with the help of springs PQ and TU and a string RS as shown in fig. The acceleration of blocks A, B and C are respectively.
The value of acceleration \(a_{1}\) at the moment string RS is cut will be:
1. g downward
2. g upward
3. more than g downward
4. zero
A 100 kg gun fires a ball of 1 kg horizontally from a cliff at a height of 500 m. It falls on the ground at a distance of 400 m from the bottom of the cliff. The recoil velocity of the gun is: (Take g = 10 m/s2)
1. 0.2 m/s
2. 0.4 m/s
3. 0.6 m/s
4. 0.8 m/s
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.