You're sitting in the back of a taxi and place your bag on the seat next to you. The taxi enters a traffic circle and travels the circle at a constant speed. During this motion, you notice that your bag does not move relative to the seat. As the taxi travels the traffic circle, which of the following statements are true in an inertial reference frame?

I. The acceleration of the bag is nonzero and constant.
II. The net force on the bag is nonzero and constant.
III. The frictional force acting on the bag is nonzero and constant.

(a) II only
(b) II and III
(c) I, II, and III
(d) III only
(e) None of the statements (I, II, or III) are true.

What happens to light waves from a star as the star moves away from earth?

Suppose that an electromagnetic wave which is linearly polarized along the x−axis is propagating in vacuum along the z−axis. the wave is incident on a conductor which is placed at z > 0 region of the space. the conductor has conductivity σ, magnetic permeability µ and electric permittivity ε. (a) find the characteristic time for the free charge density which dissipates at the conductor. (b) write the maxwell equations and derive the wave equation for a plane wave propagating in a conductor. (c) find the attenuation distance at which the incident amplitude reduces to e ^−1 of its initial value. (d) find the electric and magnetic fields inside the conductor. 8 (e) find the power loss per area of the incident electromagnetic wave at the surface of conductor.

The graph represents the distance a car travels over time while on the highway. which statement about the car's trip is accurate? a) the car does not move over time. b) the car travels at a constant velocity. c) the car's velocity increases constantly over time. d) the car's velocity decreases constantly over time.