When the ancient Greeks looked at the night sky they noticed that some points of light seem to "wander" in the sky.

Which term do we use for these wanderers today?

stars

moons

planets

nebulae

In 1980, alfa romeo introduced the first system to smooth a rough idle caused by ignition and camshaft timing changes.

In the circuit, the switch s has been open for a long time and r = 125 kohm. it is then suddenly closed. (a) determine the time constant before the switch is closed. s (b) determine the time constant after the switch is closed. _ s (c) let the switch be closed at t = 0. find the current in the switch as a function of time. (use t for time. express your answer in milliamps and seconds.) i(t) =_

3. a lunar exploration vehicle was created by a research team. it weighs 3,000 kg on the earth. it needs an acceleration of 10 m/s2 on the moon. in order to have the same acceleration, what will be the net force acting on the vehicle on the earth?