A Steel bar 2m long and 1500mm2 in cross sectional area is subjected to axial pull of 15kN. Find the Elongation of the bar. Take E=200 MPa
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Dr. Macrina: Some people think milk costs too much. If you can buy a two-liter bottle of soda for a $1.50, some will choose it over milk. People sometimes don’t think about the nutritional issue when they’re making purchasing decisions. If you ask a kid if they want milk or soda, which one do you think they’re going to choose? Also, kids used to drink a lot of milk at school, but schools have switched to very low-fat or no-fat milk which simply doesn’t taste that good to kids.
Market research shows plant-based milk substitutes are gaining popularity. Why?
Dr. Savaiano: It’s a very small part of the market, but yes, sales of plant-based beverages are increasing. It reflects that some people feel vegetable-based products are healthier. Some consumers also question modern milk production practices which also has had a negative impact on milk consumption. Depending on their composition, some of these plant-based drinks fall into the category of sweetened beverages. Some do, some don’t. It just depends on how much sugar is added.
Dr. Macrina: It’s interesting to note that while fluid milk consumption has decreased, overall dairy consumption has increased. People today are eating a lot of cheese and yogurt. But, some people perceive plant products as healthier than those from animals. Whether or not they actually are, some people believe they are allergic or intolerant to milk. A lot of the plant-based milks are flavored while there aren’t a lot of flavored cow’s milk products, other than chocolate, in many retail outlets. The plant-based products also tend to be sweeter, which is attractive to some.
How are plant-based milks made?
Dr. Macrina: Generally speaking, they grind a bean or nut then add water. The amount of water determines the consistency. Flavors, vitamins, minerals, etc. are added.
Dr. Savaiano: I’m not a food technologist, but if you look at the label you can see the ingredients. They contain components extracted from almonds, rice, soy, etc. The taste depends on what they’re flavored with and how they’re formulated.
Dr. Weaver: Soy milk, for example, is extracted from soybeans and if calcium fortified, a calcium salt is added. Similar for other plants.
What is the nutritional profile of regular milk vs almond milk and the other plant-based alternatives?
Dr. Savaiano: This is an important question because it can vary a lot. Consumers need to look at the label. Milk has lots of positive nutrients – protein, calcium, riboflavin, potassium. Milk’s nutrient profile isn’t perfect, but it’s a very nutritious food and, of course, it comes in no-fat, low-fat and full-fat varieties. The plant-based drinks can have a positive nutrient profile, too. It depends on the manufacturer.
Dr. Weaver: None of the plant-based options match cow’s milk entirely. Calcium-fortified soy milk is the closest to cow’s milk but still lower in potassium and some other nutrients. Some plant-based beverages are very low in protein as well (like almond milk) which can be a problem for kids and the elderly.
Dr. Macrina: The most variable component of cow’s milk is fat. The rest of it is relatively consistent – the protein and mineral content is going to be about the same regardless of the fat level in the milk you buy. Plant-based milks are quite variable. Some have as much fat as cow’s milk. Some have a higher sugar content. The big difference is protein. The quality of plant protein generally is not as high as animal protein. Cow’s milk has more of the building block proteins that humans need in their diet.