A hole is made at the bottom of the tank filled with water. if the total pressure at the bottom is 3 atmospheres, then what is the velocity of efflux?
you can apply Bernoulli’s equation to get the velocity. the dynamic pressure is 2 atmosphere. sov=sqrt(2*2*101325/1000)=20.13 m/sec
Can you use a milling machine to make knives?
yea all types really but you are going to need to grind down the actual blade yourself
Is walking on a treadmill bad for your knees?
Answer would be ‘It Depends’ on various factors:Whether treadmill is easier or tougher on your kneesWhether you already have knee problemsShoe you are wearingAmount of time you are walking on the treadmillThe speed of the treadmillThe form of your walking.FACTS:A treadmill provides more cushion than running or walking on a road, so it absorbs shock better. As a result, your knees and other joints will not take the same kind of beating when you use a treadmill. On the other hand, a treadmill is harder than other surfaces you could run on, such as a well-cushioned track or a golf course. Bottom line -- a treadmill can be a better or worse surface to run on than other alternatives in terms of your knees.Ideally walking is considered a low impact activity as compared to running. But walking on treadmill puts greater impact on knees as compared to walking on the ground as you have to follow the speed of the treadmill irrespectively whether you are tired or not.If you have a history of knee pain, the chances of you damaging the knee is more ontreadmill due to the bad form.When you walk on treadmill and try to match the speed of the machine, the point of contact pressure tends to remain on a very limited area of the knee which is repeated every few seconds. On the other hand, when you are walk on a track or on grass, apart from changing your position constantly you also do not try to match the speed of a machine. Changing your position continuously facilitates the persistent change of point contact area on your knee and therefore cuts the chance of wear and tear.Take Away Message:While exercising is a very good way to keep your body and joints active and healthy, excessive exercising that tests the limits of your body’s strength can sometimes have negative effects. The key is to start with moderate levels and increase the levels of your exercise regime slowly. But never do it beyond your body’s capacity. So, better walk out in the open field rather than endangering your knee on a treadmill. Even if you have to walk on a treadmill, do not overdo it; do it for shorter spans of time.Dr. Mansi Parikh,Co-Founder of EndoRush Apphttp://onelink.to/kpkh8m
Which is better, tempered glass or matte finish screen guard?
Tempered:Tempered glass is a bit thicker but its clear and feels as if you touching the screen. Tempered glass is better... if your phone falls.. the glass absorbs any damage caused due to impact.Tempered glass has 9h hardness also most of them has oleophobic coating so no smuges or fingerprints.TG is better over plastic screen guard as it protects your screen during accidental falls in addition to what a plastic one does.Matte:Matte isn't officially anti-fingerprint in my book. It's just a matte finish, so fingerprints don't show that easy. The real anti-fingerprint is a coating that prevents grease from sticking, so a fingerprint won't appear as easy. Matte also affects light transmission. So the at the same level of brightness a non-matte protector will look brighter and more clear.Matte finish screenguards excel at outdoor use but they will not be a good fit for you if watch a lot of movies, and browse image heavy websites.Choose Matte screen protector if you: 1. Stay outdoors for most of the time. 2. Can’t clean the screen protector frequently. 3. Prefer readability over image quality.
What types of electric motors are used for water pumps?
Depending on the size of pump, there can be either three phase induction machines, or single phase induction machines.The three phase variants will be squirrel cage due to their maintenance free nature, and mostly constant speed of operation. The same goes for single phase machines, but they will be more suitable for household pumps, in scale of few hundred watts to few kilowatts.You may use DC machines, with shunt machine more suitable for constant speed application. I don’t believe you would require a very high starting torque, but if so, a combination of series-shunt arrangement can be used. In this case, apart from a reliable DC source (motor drives are easy solutions, both for AC and DC motors), and an arrangement to configure the motor as a series machine first (high starting torque configuration), and then convert the same machine into shunt (constant speed application).But by my knowledge, DC machines are hardly used in deploy and forget situations.