1
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
A roller coaster is designed such that riders experience ''weightlessness'' as they go round the top of a hill whose radius of curvature is 20 m. The speed of the car at the top of the hill is between
A
16 m/s and 17 m/s
B
13 m/s and 14 m/s
C
14 m/s and 15 m/s
D
15 m/s and 16 m/s
2
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
Sand is being dropped on a conveyer belt at the rate of M kg/s. The force necessary to keep the belt moving with a constant velocity of $$\upsilon$$ m/s will be :
A
$${{Mv} \over 2}$$ newton
B
zero
C
M$$v$$ newton
D
2 M$$v$$ newton
3
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1

Three forces acting on a body are shown in the figure. To have the resultant force only along the y-direction, the magnitude of the minimum additional force needed is
A
$${{\sqrt 3 } \over 4}N$$
B
$${\sqrt 3 }$$ N
C
0.5 N
D
1.5 N
4
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
A block B is pushed momentarily along a horizontaly surface with an initial velocity V. If  $$\mu$$  is the coefficient of sliding friction between B and the surface, block B will come to rest after a time

A
g$$\mu$$/V
B
g/V
C
V/g
D
V/(g$$\mu$$).
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