1
IIT-JEE 2008 Paper 2 Offline
+3
-1

STATEMENT 1 : It is easier to pull a heavy object than to push it on a level ground.

and

STATEMENT 2 : The magnitude of frictional force depends on the nature of the two surfaces in contact.

A
Statement 1 is True, Statement 2 is True; Statement 2 is a CORRECT explanation for Statement 1
B
Statement 1 is True, Statement 2 is True; Statement 2 is a NOT CORRECT explanation for Statement 1
C
Statement 1 is True, Statement 2 is False
D
Statement 1 is False, Statement 2 is True
2
IIT-JEE 2008 Paper 1 Offline
+3
-1

A small block of mass M moves on a frictionless surface of an inclined plane, as shown in figure. The angle of the incline suddenly changes from 60$$^\circ$$ to 30$$^\circ$$ at point B. The block is initially at rest at A. Assume that collisions between the block and the incline are totally inelastic (g = 10 m/s$$^2$$).

The speed of the block at point B immediately after it strikes the second incline is

A
$$\sqrt{60}$$ m/s
B
$$\sqrt{45}$$ m/s
C
$$\sqrt{30}$$ m/s
D
$$\sqrt{75}$$ m/s
3
IIT-JEE 2008 Paper 1 Offline
+3
-1

A small block of mass M moves on a frictionless surface of an inclined plane, as shown in figure. The angle of the incline suddenly changes from 60$$^\circ$$ to 30$$^\circ$$ at point B. The block is initially at rest at A. Assume that collisions between the block and the incline are totally inelastic (g = 10 m/s$$^2$$).

The speed of the block at point C, immediately before it leaves the second incline is

A
$$\sqrt{120}$$ m/s
B
$$\sqrt{105}$$ m/s
C
$$\sqrt{90}$$ m/s
D
$$\sqrt{75}$$ m/s
4
IIT-JEE 2007 Paper 2 Offline
+3
-1
A particle moves in the X - Y plane under the influence of a force such that its linear momentum is $$\overrightarrow p \left( t \right) = A\left[ {\widehat i\cos (kt) - \widehat j\sin (kt)} \right]$$, where A and k are constants. The angle between the force and the momentum is
A
$$0^\circ$$
B
$$30^\circ$$
C
$$45^\circ$$
D
$$90^\circ$$
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