Spacecraft a and b are in the same circular earth orbit with a period of 2 hours. spacecraft b is 6 km ahead of spacecraft a. at t = 0, spacecraft b applies an in-track delta-v (retrofire) of 3 m/s. using a clohessy-wiltshire frame attached to spacecraft a, determine the distance between a and b at 30 minutes and the velocity of b relative to a-

Gam radio signals can usually be heard behind a hill, but fm often cannot. that is, am signals bend more than fm. explain. (radio signals, as we shall see, are carried by electromagnetic waves whose wavelength for am is typically 200 to 600 m and for fm about 3 m.)

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?

How to calculate voltage drop in a series circuit