Why is it difficult for a fire fighter to hold a hose that ejects large amount of water at high speed?

Why is it difficult to shoot a fish swimming in water? (AS_(1))

Among the following pairs, which occurs in large amounts in sea water?

Assertion (A) : The swelling of wooden windows tables, doors due to high humidity during the rainy season. Reason (R ) : Because of imbibition . Imbibition is the capacity of a gel or any other colloidal material to make up relatively large quantities of water and swell.

Natural water contains a small amount of tritium (H_1^3) . This isotope beta -decays with a half-life of 12.5 years.A mountaineer while climbing towards a difficult peak finds debris of some earlier unsuccessful attempt.Among other things he finds a sealed bottle of whisky.On returm he analyses the whisky and finds that it contains only 1.5 per cent of hte H_1^3 radioactivity as compared to a recently purchased bottle marked '8 years old' .Estimate the time of that unsuccessful attempt.

Consider a tank which initially holds V_(0) liter of brine that contains a lb of salt. Another brine solution, containing b lb of salt per liter is poured into the tank at the rate of eL//"min" . The problem is to find the amount of salt in the tank at any time t. Let Q denote the amount of salt in the tank at any time. The time rate of change of Q, (dQ)/(dt) , equals the rate at which salt enters the tank at the rate at which salt leaves the tank. Salt enters the tank at the rate of be lb/min. To determine the rate at which salt leaves the tank, we first calculate the volume of brine in the tank at any time t, which is the initial volume V_(0) plus the volume of brine added et minus the volume of brine removed ft. Thus, the volume of brine at any time is V_(0)+et-ft The concentration of salt in the tank at any time is Q//(V_(0)+et-ft) , from which it follows that salt leaves the tank at the rate of f(Q/(V_(0)+et-ft)) lb/min. Thus, (dQ)/(dt)=be-f(Q/(V_(0)+et-ft))Q=be A tank initially holds 100 L of a brine solution containing 20 lb of salt. At t=0, fresh water is poured into the tank at the rate of 5 L/min, while the well-stirred mixture leaves the tank at the same rate. Then the amount of salt in the tank after 20 min.

Assertion : on a rainy day it is difficult to drive a bus at high speed Reason : Due to wetting of the surface the value of coefficient of friction is lowered Which one of the following statement is a correct statement

Why is it easier to carry the same amount of water in two buckets, one in each hand rather than in a single bucket?