Kinematics (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 131  135 of 233
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Question number: 131
» Kinematics » Average Speed and Instantaneous Velocity
Question
A particle moves in a circle of radius 10cm with a linear speed of 20m/s. The angular velocity will be –
Choices
Choice (4)  Response  

a.  25 rad/s 

b.  75 rad/s 

c.  50 rad/s 

d.  200 rad/s 

Question number: 132
» Kinematics » Motion in a Straight Line
Question
If t _{1} be the time taken by a body to clear the top of a building and be the time spent in air, then t _{2}: t _{1} will be 
Choices
Choice (4)  Response  

a.  2: 1 

b.  1: 1 

c.  1: 2 

d.  1: 4 

Question number: 133
» Kinematics » Motion in a Straight Line
Assertion (Ꭺ)
A cyclist is cycling on rough horizontal circular track with increasing speed. Then the frictional force on cycle is always directed towards center of the circular track.
Reason (Ꭱ)
For a particle moving in a circle, radial component of net force should be directed towards center. You have to select the correct choice.
Choices
Choice (4)  Response  

a.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ 

b.  Ꭺ is true but Ꭱ is false 

c.  Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ 

d.  Both Ꭺ and Ꭱ are false 

Question number: 134
» Kinematics » Average Speed and Instantaneous Velocity
Question
The angular speed with which the earth would have to rotate on its axis so that a person on the equator would weigh (3/5) ^{th} as much as present, will be: (Take the equatorial radius as 6400 km)
Choices
Choice (4)  Response  

a.  7.8 x 10 ^{3} rad/sec 

b.  7.8 x 10 ^{4} rad/sec 

c.  8.7 x 10 ^{3} rad/sec 

d.  8.7 x 10 ^{4} rad/sec 

Passage
Velocity at a general point P (x, y) for a horizontal projectile motion is given by
V = =
α is angle made by v with horizontal in clockwise direction Trajectory equation for a horizontal projectile motion is given by x = v _{x} t = ut
y = () gt ^{2 }
Eliminating t, We get y =
Question number: 135 (1 of 3 Based on Passage) Show Passage
» Kinematics » Average Speed and Instantaneous Velocity
Question
A ball rolls off top of a stair way with a horizontal velocity u m/s. If the steps are h m high and b meters wide, the ball will just hit the edge of nth step if n equals to
Choices
Choice (4)  Response  

a. 


b. 


c. 


d.  Both c. and a. are correct 
