KinematicsAverage Speed and Instantaneous Velocity (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 42  46 of 108
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Question number: 42
» Kinematics » Average Speed and Instantaneous Velocity
Question
A car driver is negotiating a curve of radius 200 m with a speed of 15 km/hr. The angle through which he has to lean from the vertical will be –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 43
» Kinematics » Average Speed and Instantaneous Velocity
Question
A particle is moving in a circular path with velocity varying with time as v = 1.5t+ 2t. If the radius of circular path is 2 cm. the angular acceleration at t = 2 sec will be –
Choices
Choice (4)  Response  

a.  400 rad/sec ^{2} 

b.  4 rad/sec ^{2} 

c.  0.4 rad/sec ^{2} 

d.  40 rad/sec ^{2} 

Question number: 44
» 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: 45
» 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: 46 (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 
