KinematicsAverage Speed and Instantaneous Velocity (NEET Physics): Questions 43  47 of 108
Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 2098 questions. Access all new questions we will add tracking exampattern and syllabus changes. View Sample Explanation or View Features.
Rs. 550.00 or
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 

Question number: 47 (2 of 3 Based on Passage) Show Passage
» Kinematics » Average Speed and Instantaneous Velocity
Question
An aeroplane is in a level flying at an speed of 144 km/hr at an altitude of 1000 m. How far horizontally from a given target should a bomb be released from it to hit the target?
Choices
Choice (4)  Response  

a.  471.34 m 

b.  671.43 m 

c.  371.34 m 

d.  571.43 m 
