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2 - This is a sum of forces problem. If it's on a horizontal surface, then vertically it's not moving. The vertical forces are the gravitational force (mg) and the normal force (mg), which are...

An easy way to think about it is to take the table above and assume each percentage point corresponds to one person - so, 100 people total. Then,

a) There are 44 people with blood type O - 38 of...

Remember what the relationship is between electric field and electric potential. If you have a constant electric field, the potential is given by the negative of the electric field times the...

You need to think about it in terms of possible outcomes. For example, suppose she starts with a hard serve. For the first serve, there's a 1/2 chance that she hits the serve. If she hits it,...