1
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Change Language
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
Change Language
Point masses m1 and m2 are placed at the opposite ends of a rigid rod of length L, and negligible mass. The rod is to be set rotating about an axis perpendicular to it. The position of point P on this rod through which the axis should pass so that the work required to set the rod rotating with angular velocity $$\omega $$0 is minimum, is given by

AIPMT 2015 Physics - Rotational Motion Question 75 English
A
$$x = {{{m_2}} \over {{m_1}}}L$$
B
$$x = {{{m_2}L} \over {{m_1} + {m_2}}}$$
C
$$x = {{{m_1}L} \over {{m_1} + {m_2}}}$$
D
$$x = {{{m_1}} \over {{m_2}}}L$$
3
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Change Language
In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is
A
$${{27} \over 5}$$
B
$${5 \over {27}}$$
C
$${4 \over 9}$$
D
$${9 \over 4}$$
4
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Change Language
A remote-sensing satellite of earth revolves in a circular orbit at a height of 0.25 $$ \times $$ 106 m above the surface of earth. If earth's radius is 6.38 $$ \times $$ 106 m and g = 9.8 ms$$-$$2, then the orbital speed of the satellite is
A
9.13 km s$$-$$1
B
6.67 km s$$-$$1
C
7.76 km s$$-$$1
D
8.56 km s$$-$$1
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