Pentru aceleasi corp,pe pamant sau pe luna,difera masa greutatea corpului?
2 answers:
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In the push-up, the athlete's weight (or force) of 250 N moves through a distance of 20 cm.
By definition,
Work = force * distance.
Therefore, work done in one push-up is
Note that 1 J = 1 N-m.
Answer: 1 J
By definition,
Work = force * distance.
Therefore, work done in one push-up is
Note that 1 J = 1 N-m.
Answer: 1 J
Answer:
Protons have about the same mass as electrons is false
Explanation:
Electrons and protons have the same magnitude on charge but opposite sign
: charge of electron
: charge of proton
Neutrons have no charge.
An atom is composed of protons and neutrons in the nucleus and electrons surrounding it, so a neutral atom has the same number of protons and electrons to has a net charge of zero. So, all the facts mentioned are true.
The false one is that protons have about the same mass as electrons, because the mass of an electron is and the mass of a proton is
so the mass of a proton is a lot of bigger than electron mass.