Uma wants to recreate the discovery of superconductivity. Which describes the materials needed?
a tool to increase temperatures, copper, resistance, a tool to measure electric current
a tool to drop temperatures, mercury, an electric current, and a tool to measure resistance
a tool to drop temperatures, mercury, resistance, a tool to measure electric current
a tool to increase temperatures, copper, an electric current, and a tool to measure resistance
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maria has a savings account that is earning simple interest. if she started with $200 in the account and has earned a total of $8 in interest in two years, what is the rate of the account? use the formula  .

answer: the potential energy decreases from 379 j to 243 j

explanation:

for the law of conservation of energy, the total energy in a system must be conserved. the total energy of the system is given by the sum of kinetic (k) and potential (u) energy:

e = k + u

the total energy is e=675 j, and this does not change.

initially, the kinetic energy is k=296 j, so the potential energy is

at the end, the kinetic energy is k=432 j, so the potential energy is

so, we see that the potential energy has decreased from 379 j to 243 j.