An ac source drives a sinusoidal current of amplitude i0and frequency ? into an inductor having inductance l and a capacitor having capacitance c that are connected in series. the current as a function of time is given by i(t)=i0sin(? t)

recall that the voltages vl(t) and vc(t) across the inductor and capacitor are not in phase with the respective currents il(t) and ic(t). in particular, which of the following statements is true for a sinusoidal current driver?

a. vl(t) and vc(t) both lag their respective currents.
b. vl(t) and vc(t) both lead their respective currents.
c. vl(t) lags il(t) and vc(t) leads ic(t).
d. vl(t) leads il(t) and vc(t) lags ic(t).

In which scenario is the least amount of work done on a crate? a force of 120 n moves it 25 m. a force of 115 n moves it 26 m. a force of 130 n moves it 22 m. a force of 125 n moves it 27 m.

To run the physics cart, the fan speed of the cart is manipulated. this is the (blank) variable. the cart accelerates due to the speed of the fan. acceleration is therefore the (blank) variable. a “constant” is a parameter that stays the same regardless of the variables. one parameter of the cart that is held constant is the (blank) .

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)