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Q: What year did they put a shield on the back of pennies?
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Continue Learning about Math & Arithmetic

How many pennies can you put into an empty 1 gal bottle?

it usally rounds up two 1,500 pennies


How many times does twenty five go into thirty?

Once. Put thirty pennies on the table, remove one set of 25 pennies. Are there enough pennies left to remove another set of 25? No.


Does mass affect speed when you put pennies on a toy car and let go down a ramp?

Yes, As a Boy scout we would weight our cars so that they would travel faster.


Why is percentage yield not 100 percent?

If you invest 25 dollars, and a year later they give you back $25.50, what did that investment yield ?Don't count the $25 you put in. That was yours all the time, and just having it returned is no big deal.The investment yielded 50¢ . That's 2 percent of the $25 that you put in, so the investment yielded 2% for the year.


There are a 1000 pennies in a jar without removing any pennies explain how you can find the mass of one penny?

the question is too vagueif you're allowed to use a good weighing machine then weigh the total jar and divide the answer by 1000 (saying the glass jar has negligible weight and the mass of air negligible)if you know the mass of the glass jar then minus the total weight with the glass jars and then divide by 1000otherwise if you're not allowed to use a weighing machine you can use the water method which would be a bit more complicated. (there are other method to find the weight using vacuum)And moreIt's even more complicated than that! Not all pennies have the same mass, so the experiment is very ill-defined. Pennies (cents, really) made before 1982 have an average mass of 3.11 gm, while cents made after that year have a mass of 2.5 grams. If that's not confusing enough, cents specifically dated 1982 can have either mass depending on where they were made and at what time of the year. IN ADDITION....to answer the original question proposed. If you take the jar full of pennies and put it on a scale. Then add a single penny to the jar already full of pennies the weight will increase. This being done one can now subtract the added weight from the original weight of the full jar to find the weight of a single penny