Explain The snowfall.

\(\cfrac{3^{1/5}}{3^{1/3}}\) = …………..

A) 3^1/15 

B) 3^2/15 

C) 3^-2/15 

D) 3^8/15

A and B are two independent events. The probability that both A and B occur is 1/6 and the probability that neither of them occurs is 1/3. Find the probability of the occurrence of A. 

In a Δ ABC, a = 3, b = 5 and c = 7, find the values of cos A, cos B, cos C.

Place the sharp head of a nail towards a wooden block it lightly by hammer. nail does not pierce the wooden block by light blow of the hammer. Using same hammer, now strike hard. Why does nail penetrate into wooden block this time? Due to the hard strike by the hammer,more force is applied due to which more pressure is applied on the object.

It is clear from both the above activities that magnitude of pressure depends on applied force. When the applied force is different on the same area than the pressure is also different on the object.

1. Why does nail penetrate into wooden block this time?

2. Why pointed nail gets into the wooden block easily, as compared to a thicker nail?