How much greater is the resistivity of lead to copper

Keneila is attempting to ski down a 20 m high friction free hill for the first time. she has a speed 10 m/s at the top. what is her kinetic energy when she is a the bottom, 20 m ? (a)2500 j (b)9800 j (c)12300 j (d)3100j (e)15000j

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

In a series circuit the __ is the same at every point