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Which statement is true about the atom? A: it contains positive electrons, uncharged protons and negative protons. B: it contains uncharged neutrons, positive electrons and negative protons.

A weightlifter lifts a 1400 N barbell 2.5 meters. Calculate the work done during the lift

Which of the following is a unit of temperature? a. Celsius degree b. joule c. kilogram d. calorie

Who invented the steam engine? A. James Watt B. Eli Whitney C. Thomas Edison and Benjamin Franklin D. Thomas Savery and Thomas Newcomen

If you pull on a box that weighs 100 kilograms with a force of 75 newtons, but you just can not budge the box and it does not move at all, how much work did you do?

A skydiver of mass m jumps from a hot air balloon and falls a distance d before reaching a terminal velocity of magnitude v. Assume that the magnitude of the acceleration due to gravity is g. a.

8. What happens to force when mass is increased?

Give an example of ionic and covalent bond, and explain and make an example for each.

Which of these is the best reason for proper nutrition? A. To ensure that you will be skinny B. To protect yourself against certain diseases C. To improve your intelligence D. To ensure that you will get good grades

And object has a mass of 15g it has a volume of 7.5ml. find the density of the object.