(a) Suppose Betty takes off in one direction while Andy travels at the same speed but in the opposite direction. They travel an equal distance from Earth, then turn around and come back. What will Andy's, Betty's, and the Earth's clocks show? (b) If two of triplets travel in opposite directions for 5 light years and then return: (i) will they be the same age? (ii)How will their age be, compared to the triplet who stayed home?

(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?

An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.

If element x has 99 protons how many electrons does it have