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

A block of mass m is kept on a platform which starts from rest with constant acceleration g/2 upward, as shown in fig. work done normal reaction on block in time t is :

        

(a)

0

(b)

(c)

(d)


Question ID - 50234 :-

A block of mass m is kept on a platform which starts from rest with constant acceleration g/2 upward, as shown in fig. work done normal reaction on block in time t is :

        

(a)

0

(b)

(c)

(d)

1 Answer
5876 Votes
3537

Answer Key : (b) -

N−mg =

Now, work done W= =

⇒ W =



Next Question :

A heat source at T= k is connected to another heat reservoir at T=k is connected to another heat reservoir at T= K by a copper slab which is 1m thick. Given that the thermal conductivity of copper is 0.1 , the energy flux through it in the steady state is :

(a)

90

(b)

200 W

(c)

65

(d)

120


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