SaraNextGen Study App [2022-23]
Last Updated On 23-10-2022 - By Sara

A heavy ball of mass M is suspended from the ceiling of a car by alight string of mass m (m<<M).  When the car is at rest, the speed of transverse waves in the string is 60 ms−1.  When the car has acceleration, a the waves-speed increases to 60.5ms−1, the value of a, in terms of gravitational acceleration g, is closest to :

a.

 

b.

 

c.

 

d.

 


Question ID - 50054 :-

A heavy ball of mass M is suspended from the ceiling of a car by alight string of mass m (m<<M).  When the car is at rest, the speed of transverse waves in the string is 60 ms−1.  When the car has acceleration, a the waves-speed increases to 60.5ms−1, the value of a, in terms of gravitational acceleration g, is closest to :

a.

 

b.

 

c.

 

d.

 

1 Answer
5876 Votes
3537

Answer Key : (a) -

60=

60.5= =

+

 g2+a2+g2+g2

a = g

= .



Next Question :

A sample of radioactive material A, that has an activity of 10m Ci(l Ci=3.7  1010decays/s), has twice the number of nuclei as another sample of a different radioactive maternal B which has an activity of 20mCi.  The correct choice for hall-lives of A and B an would then be respectively:

a.

20 days and 5 days

b.

20 days and 10 days

c.

5 days and 10 days

d.

10days and 40days


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