1
JEE Main 2020 (Online) 3rd September Morning Slot
Numerical
+4
-0
A person of 80 kg mass is standing on the rim of a circular platform of mass 200 kg rotating about its axis at 5 revolutions per minute (rpm). The person now starts moving towards the centre of the platform. What will be the rotational speed (in rpm) of the platform when the person reaches its centre _________.
2
JEE Main 2020 (Online) 9th January Morning Slot
Numerical
+4
-0
One end of a straight uniform 1m long bar is pivoted on horizontal table. It is released from rest when it makes an angle 30º from the horizontal (see figure). Its angular speed when it hits the table is given as $$\sqrt n$$ s-1, where n is an integer. The value of n is _________.
3
JEE Main 2020 (Online) 9th January Morning Slot
Numerical
+4
-0
A body of mass m = 10 kg is attached to one end of a wire of length 0.3 m. The maximum angular speed (in rad s–1) with which it can be rotated about its other end in space station is :
(Breaking stress of wire = 4.8 × 107 Nm–2 and
area of cross-section of the wire = 10–2 cm2) is:
4
JEE Main 2020 (Online) 7th January Evening Slot
Numerical
+4
-0
Consider a uniform cubical box of side a on a rough floor that is to be moved by applying minimum possible force F at a point b above its centre of mass (see figure). If the coefficient of friction is $$\mu$$ = 0.4, the maximum possible value of 100 × $${b \over a}$$ for box not to topple before moving is .......