Two automobiles are 150 kilometers apart and traveling toward each other. one automobile is moving at 60 km/h and the other is moving at 40 km/h mph. in how many hours will they meet?

What is the rate of change in a objects position?

(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?

What are the similarities & differences between a thermistor and a light dependent resistor in physics?