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))

A spherical glass vessel has cylindrical neck 8 cm long 2 cm in diameter the diameter of the spherical part is 8.5 cm . By measuring the amount of water if holds a child finds its volume to be 345 cm^(3) . Check whether she is correct taking the above as the inside measurements, and pi=3.14

Comprehension # 9 In James bond movie ''The Spy Who Loved Me'', James skied down a snowy slope in an attempt to escape from the killer. Unfortunately, the killer had a higher skiing speed than James's, they are 40m//s and 40m//s respectively. Now consider an alternative version of the movie. James noted that he and the killer carried the same kind of rifle' and estimated that their masses M (including body mass, skis, weapon, backpack, ect) were about the same. Recalling high school physics knowledge, James realised that each time he fired his weapon back at the killer, his momentum would change, whereas when the killer fired, the killer's momentum would also change. Evergy time James fired a bullet, the killer would fire back accordingly. Assume that all bullets missed their targets (otherwise this exercise would terminte). Given M = 100 kg , mass and the muzzle velocity of a bullet are m = 0.02 kg and v = 500 m//s respectively How many bullets James had to fire in order to assure that the killer couldn't catch up with him ?

Assertion: On a rainy day, it is difficult to drive a car or bus at high speed. Reason: The value of coefficient of friction is lowered due to wetting of the surface.

Why is aerobic degradation more important than anaerobic degradation for the treatment of large volumes of waste waters rich in organic matter? Discuss.

Why is it easier to carry the same amount of water in two buckets, one in each hand rather than in a single bucket? (AS_(7))

In the figure there is a long horizontal bridge over a river 75 m high from water surface. A strong man throws a stone in the parallel plane of the bridge. A observer in a car travelling on the bridge finds the stone going pass by the car while ascending and also while descending between two points on the road 30 m away. The car is travelling at a speed of 15 m/s. The stone is thrown from the bank of river just at the same level of water. What is the distance between car and atone at the instant when particle reaches at point B ?