PHILOS 101 Lecture 28: 12/6 ethics #4

Force vec F = -10 hat j N is exerted on a particle at vec r = (4hat i + 5 hat j) m

Tx, Ty, Tz in N*m...?

A particle moves with v = const. along the curve r =k (1 + cos θ ) (a cardioid ). Find r ⋅ e_ r = a ⋅ e_ r , | a | , a n d θ·

The voltage V in volts of an electrical circuit is V = IR, where R is the resistance in ohms and I is the current in amperes. R is increasing at a rate of 2 ohms per second, and V is increasing at a rate of 3 volts per second. At what rate is I changing when V = 12 volts and R = 4 ohms?