1
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
An automobile moves on a road with a speed of 54 km h$$-$$1. The radius of its wheels is 0.45 m and the moment of inertia of the wheel about its axis of rotation is 3 kg m2. If the vehicle is brought to rest in 15 s, the magnitude of average torque transmitted by its brakes to the wheel is
A
10.86 kg m2 s$$-$$2
B
2.86 kg m2 s$$-$$2
C
6.66 kg m2 s$$-$$2
D
8.58 kg m2 s$$-$$2
2
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
A force $$\overrightarrow F = \alpha \widehat i + 3\widehat j + 6\widehat k$$ is acting at a point $$\overrightarrow r = 2\widehat i - 6\widehat j - 12\widehat k$$. The value of $$\alpha $$ for which angular momentum about origin is conserved is
A
zero
B
1
C
$$-$$ 1
D
2
3
AIPMT 2015 Cancelled Paper
MCQ (Single Correct Answer)
+4
-1
A rod of weight W is supported by two parallel knife edges A and B and is in equilibrium in a horizontal position. The knives are at a distance d from each other. The centre of mass of the rod is at distance x from A. The normal reaction on A is
A
$${{W\left( {d - x} \right)} \over x}$$
B
$${{W\left( {d - x} \right)} \over d}$$
C
$${{Wx} \over d}$$
D
$${{Wd} \over x}$$
4
AIPMT 2015 Cancelled Paper
MCQ (Single Correct Answer)
+4
-1
Three identical spherical shells, each of mass m and radius r are placed as shown in figure. Consider an axis XX' which is touching to two shells and passing through diameter of third shell. Moment of inertia of the system consisting of these three spherical shells about XX' axis is

AIPMT 2015 Cancelled Paper Physics - Rotational Motion Question 70 English
A
$${{16} \over 5}m{r^2}$$
B
4mr2
C
$${{11} \over 5}m{r^2}$$
D
3mr2
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