(20 points ) jerri is planning to rebuild the engine of an antique car. she has chosen all the materials she needs including a high quality synthetic oil to reduce friction in the engine. what effect will reducing friction have on the engines performance? a reduces friction means reduced efficiency b reduces friction means reduced heat transfer c reduces friction means increased efficiency d reduces friction means increased heat transfer

Reduces friction means increased efficiency

Explanation:

Friction is known to decrease efficiency in machines. In redesigning the engine if the antique car, and the inclusion of oil to reduce friction in the engine, she aims to improve the efficiency of the engine.

Friction leads to lost work in mechanical systems. Friction accounts for the fact that the efficiency of an engine is never 100% since some of the input work is lost as friction.

Hence decreasing the friction improves the efficiency of the machine.

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.