Two lightbulbs each with a resistance of 20 ω are connected in series to a voltage of 120 v. if a third lightbulb of 20 ω is added to the circuit, how will the current change?
a. it will remain the same.
b. it will increase from 40 a to 60 a.
c. it will decrease from 30 a to 20 a.
d. it will decrease from 60 a to 20 a.

=force × distance a. work b. velocity c. pressure d. momentum

What occurs during a combustion reaction

1.)the isotope cobalt-60 has a nuclear mass of 59.933820 u calculate the mass defect of cobalt-60 using the following information. mass of proton: 1.007825 u mass of neutron: 1.008665 u 1 u = 931.5 mev 2.)the isotope cobalt-60 has a nuclear mass of 59.933820 u calculate the binding energy of cobalt-60 using the following information. mass of proton: 1.007825 u mass of neutron: 1.008665 u 1 u = 931.5 mev 3.)the isotope cobalt-60 has a nuclear mass of 59.933820 u calculate the binding energy per nucleon of cobalt-60 using the following information. mass of proton: 1.007825 u mass of neutron: 1.008665 u 1 u = 931.5 mev