A pressure gauge consists of two cylindrical bulbs B and C each of 10 sq.cm cross-
sectional area, which are connected by a U-tube with vertical limbs each of 0.25 sq.cm cross-sectional
area. A red liquid of specific gravity 0.9 is filled into C and clear water is filled into B. the surface of
separation being in the limb attached to C. Find the displacement of the surface of separation when the
pressure on the surface in C is greater than that in B by an amount equal to 1 cm head of water.
Answers
Answer:
sorry
All mammals produce milk to feed their young, but dairy cattle, such as the well-known Holstein-Friesian cow, have been specially bred to produce very large quantities of milk. Since only females produce milk, they are far more common in the dairy industry. Dairy bulls are often large, powerful, and aggressive and are more challenging to keep. As a result, most breeding in modern dairy operations occurs through artificial insemination, with bulls living at just a few specialized facilities. Different breeds of dairy cows have been bred for specific milk characteristics, such as to maximize yield or to produce a desired level of fat in the milk. Milk from cows is a significant part of many food items; in addition to its direct consumption as a beverage, it is used to make a wide range of products including butter, yogurt, cheese, and ice cream.
Holstein-Friesian cow
Holstein-Friesian cow
Holstein-Friesian cow.
© Larry Lefever/Grant Heilman Photography, Inc.
Dairy cows produce milk for around 10 months following the birth of the calf. A typical western dairy cow is usually milked twice per day and produces on average 30 litres (8 gallons) of milk daily; however, the actual amount produced depends upon the age and breed of the cow. Most modern milking is not done by hand but by machines.
Cows usually have their first calf when they are just under two years old—with single calves being typical, although twins sometimes occur—and each cow may have ten or more calves over the course of her life. Even though cows can live for 20 years or more, older dairy cows are often culled from commercial herds and used for meat when their milk yield begins to decline.
The meat of adult cows is known as beef; meat from calves (typically slaughtered at three months of age) is known as veal. Beef cattle, such as the common Hereford and Aberdeen-Angus breeds, have been bred to produce muscle, not milk, and tend to be much heftier than dairy cows. Breeds of beef cattle have differing characteristics in regards to growth rate, fat content of the meat, disease resistance, and ability to handle drought. In addition to muscle meat, a variety of organs from cows—including liver, kidney, heart, brains, and various glands—are also consumed by people. Beef cows are typically farmed in less intensive systems than dairy cows, since they are not handled daily for milking