Does Red Cross pay for platelets? Platelets can only be donated at select American Red Cross Donation Centers and it requires an appointment. You will be able to provide in one platelet donation what would normally be collected from up to five whole blood donations. In fact, some platelet donations yield enough platelets for two […]
Do geese sleep while flying?
Do geese sleep while flying? Now, however, according to a new study from the Max Planck Institute for Ornithology, researchers have finally found evidence that birds do indeed sleep while flying. Why do birds fly in circles at sunset? Why do flocks of birds fly in a circle over the same place over and over […]
What is the importance of mineral resources?
What is the importance of mineral resources? Their Importance: Essential for industrial and economic development of nations. Copper, tin & iron ore were essential to the ancient metal-using cultures of the Bronze & Iron Ages. What is the use of the following resources land? Land is used for various activities like obtaining natural resources such […]
Who invented circular motion?
Who invented circular motion? Newton Why is circular motion important in our daily lives? Circular motion is very common and very important in our everyday life. Satellites, the moon, the solar system and stars in galaxies all rotate in “circular” orbits. The term circular here is being used loosely since even repetitive closed motion is […]
Where I can ask questions and get answers?
Where I can ask questions and get answers? Herein find some best sites where you can ask questions and get answers from real people online. Answerbag. Yahoo! Answers. Blurt it. WikiAnswers. FunAdvice. Askville. Friendfeed. How do you ask Google a question? Ask a question On your computer, open Google. Search for a place. Under the […]
How is sound waves measured?
How is sound waves measured? Sound energy travels in waves and is measured in frequency and amplitude. Amplitude measures how forceful the wave is. Frequency is measured in the number of sound vibrations in one second. A healthy ear can hear sounds of very low frequency, 20 Hertz (or 20 cycles per second), to a […]
What is the difference between EMF and back EMF?
What is the difference between EMF and back EMF? The back emf is represented as a variable emf that opposes the emf driving the motor. Back emf is zero when the motor is not turning and increases proportionally to the motor’s angular velocity. The generator output of a motor is the difference between the supply […]
Why thick wires are used in transformer?
Why thick wires are used in transformer? When a transformer is in operation, there are ac currents in primary and secondary coils. This is the most important for the high current winding (the secondary coil of a step-down transformer). Thick copper wire is used for this winding, because thick wire of low resistivity has a […]
What has the highest air pressure?
What has the highest air pressure? 1083.8mb How much air pressure can a human survive? A person can withstand perhaps 100 atmospheres of pressure if they aren’t breathing air – divers do it. If they are breathing air, the limit is just a handful of atmospheres. Not sure exactly how many it takes before oxygen […]
Can crystals help with anxiety?
Can crystals help with anxiety? Working with grounding stones to create a sense of balance tends to calm the mind quite a lot. Carlton suggests that smokey quartz, red jasper, agate, black tourmaline, shungite and haematite are all good options to meditate with, to help alleviate anxiety. Should I sleep with crystals under my pillow? […]