Atoaster can be considered to be a heat engine that does no work. heat flows through the toaster coils without being transformed into mechanical energy. what is the thermal effeciency of this example of a heat engine? a) 0.50 b) 1 c) 0 d) -1

The seven sisters, seven stars located more than 400 light-years away in the taurus constellation can be seen here with venus and another constellation, orion. the seven stars stay grouped together but seem to move, like the planet venus. why do stars seem to move like planets in the night sky?

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

Aball horizontally thrown from a cliff at 8m/s