Warning: Cannot modify header information - headers already sent by (output started at /home/content/70/7481070/html/appsrc/doyouknow.php:18) in /home/content/70/7481070/html/header.php on line 20

Warning: Cannot modify header information - headers already sent by (output started at /home/content/70/7481070/html/appsrc/doyouknow.php:18) in /home/content/70/7481070/html/header.php on line 21
Do You Know
Questions & Answers on General Knowledge.

My teacher said that if you lift a 5 pound sack, you are doing work but if you carry the sack, you aren't doing any work. Why is that?
When you lift the sack, you are pushing it upward (to support its weight) and it is moving upward. Since the force you exert on the sack and the distance it is traveling are in the same direction, you are doing work on the sack. As a result, the sack's energy is increasing, as evidenced by the fact that it is becoming more and more dangerous to a dog sitting beneath it. But when you carry the sack horizontally at a steady pace, the upward force you exert on the sack and the horizontal distance it travels are at right angles to one another. You don't do any work on the sack in that case. The evidence here is that the sack doesn't become any more dangerous; its speed doesn't increase and neither does its altitude. It just shifts from one place to an equivalent one to its side.
--- >>>
More Questions:
  • What information is now available about magnetic fields and free radicals in our bodies?
  • Does an (audio) amplifier benefit from using matched pairs of power transistors?
  • What is Daylight Saving Time?
  • How are the binary numbers represented in the ridges of the CD?
  • How do plants protect themselves from their enemies?
  • How does light cancel in destructive interference?
  • What happens to gas in a gas mask?
  • How fast does sound travel through the telephone? - T
  • Can we predict earthquakes?
  • Where did the customs of Halloween come from?
  • What is a booger?
  • How does the Moon cause tides in our oceans and seas?
  • Why do planes disappear in the Bermuda Triangle?
  • What is heat energy used for?
  • How are clouds formed?
  • How does an acetylene miner's lamp work? How does a propane gas lamp work? Why do gas lamps need a mantle and what is the mantle made of?
  • Why were dancers in the thirties and forties called “jitterbugs”?
  • What is ink made of?
  • Why does water sound loudest just before it reaches the boiling point, and then why does it get quieter once it actually boils?
  • What were the bizarre ingredients of history’s most exotic Christmas pies?
  • Why is Norway called the land of the midnight Sun?
  • Why do we call New York the “The Big Apple”?
  • Can fish fly?
  • Can I warm plates in my microwave oven?
  • What is the metric system?
  • Benefits of Cashew
  • Weird Rituals
  • 101 Places to visit in India
  • English Phrases
  • Rules to play Knee Boarding
  • What to Eat in Nagaland

  • Valentines Gift Ideas

    MVMT Watch

    Simple and stylish, this watch from MVMT has all the characteristics of an everyday essential. But beyond just looking good, it s equipped with some solid specs: 3 hand quartzmovement (analog with date function);a 38mm gold polished,stainless steel case;10mm hardened mineral crystal;and a buttery leather strap.

    Chourishi Systems