A train travels at 40m/s. Calculate the time it takes to travel:
A) 30,000 m
B) 50 km

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

Humidity is to blame for that muggy, steamy feeling you experience on some hot summer days. what gas in the atmosphere causes humidity? a) oxygen b) hydrogen c) nitrogen d) water vapor