1
JEE Main 2021 (Online) 20th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
The normal reaction 'N' for a vehicle of 800 kg mass, negotiating a turn on a 30$$^\circ$$ banked road at maximum possible speed without skidding is ____________ $$\times$$ 103 kg m/s2. [Given cos30$$^\circ$$ = 0.87, $$\mu$$s = 0.2]
A
12.4
B
7.2
C
6.96
D
10.2
2
JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
A particle of mass m moves in a circular orbit under the central potential field, $$U(r) = - {C \over r}$$, where C is a positive constant. The correct radius $$-$$ velocity graph of the particle's motion is :
A
JEE Main 2021 (Online) 18th March Evening Shift Physics - Circular Motion Question 38 English Option 1
B
JEE Main 2021 (Online) 18th March Evening Shift Physics - Circular Motion Question 38 English Option 2
C
JEE Main 2021 (Online) 18th March Evening Shift Physics - Circular Motion Question 38 English Option 3
D
JEE Main 2021 (Online) 18th March Evening Shift Physics - Circular Motion Question 38 English Option 4
3
JEE Main 2021 (Online) 17th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
A modern grand - prix racing car of mass m is travelling on a flat track in a circular arc of radius R with a speed v. If the coefficient of static friction between the tyres and the track is $$\mu$$s, then the magnitude of negative lift FL acting downwards on the car is : (Assume forces on the four tyres are identical and g = acceleration due to gravity)

JEE Main 2021 (Online) 17th March Morning Shift Physics - Circular Motion Question 39 English
A
$$m\left( {g - {{{v^2}} \over {{\mu _s}R}}} \right)$$
B
$$ - m\left( {g + {{{v^2}} \over {{\mu _s}R}}} \right)$$
C
$$m\left( {{{{v^2}} \over {{\mu _s}R}} - g} \right)$$
D
$$m\left( {{{{v^2}} \over {{\mu _s}R}} + g} \right)$$
4
JEE Main 2021 (Online) 16th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Statement I : A cyclist is moving on an unbanked road with a speed of 7 kmh$$-$$1 and takes a sharp circular turn along a path of radius of 2m without reducing the speed. The static friction coefficient is 0.2. The cyclist will not slip and pass the curve. (g = 9.8 m/s2)

Statement II : If the road is banked at an angle of 45$$^\circ$$, cyclist can cross the curve of 2m radius with the speed of 18.5 kmh$$-$$1 without slipping.

In the light of the above statements, choose the correct answer from the options given below.
A
Statement I is incorrect and statement II is correct
B
Both statement I and statement II are true
C
Statement I is correct and statement II is incorrect
D
Both statement I and statement II are false
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