On occasion, someone claims to have come up with an idea for a machine that can run perpetually with any energy input, and that will therefore produce more energy than it uses. Either such a machine can be built or it cannot. Explain which it is and list the scientific law that applies here.

Which statement correctly describes the current in a circuit that is made up of any two resistors connected in parallel with a battery? a. the current in the battery and in each resistor is the same b. the current the battery equals to the sum of the currents in the resistors c.the current in the battery is less than the current in either resistor d. the current in the battery equals to the product of the currents in the resistors

Could we see a galaxy that is 20 billion light-years away?

Ascientist notices that an oil slick floating on water when viewed from above has many different colors reflecting off the surface, making it look rainbow-like (an effect known as iridescence). she aims a spectrometer at a particular spot and measures the wavelength to be 750 nm (in air). the index of refraction of water is 1.3