If you live in the southern hemisphere, what season would you be experiencing in position c this diagram?

a) fall

b) summer

c) winter

d) spring

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?

What are the dimensions of the cross section that passes through the points a, f, g, and d?

Three resistors are connected in series across a 15-v power supply. if the potential drops across resistors 1 and 2 are 4.1 volts and 3.1 volts, what is the exact potential drop (in volts) across resistor 3?