A resistor R1 is wired to a battery, then resistor R2 is added in series.

(a) Is the potential difference across R1 now more than, less than, or the same as previously?

(b) Is the current i1 through R1 now more than, less than, or the same as previously?

(c) Is the equivalent resistance R12 of R1 and R2 more than, less than, or the same as R1?

A. more than

B. less than

C. same as

For general projectile motion, when the projectile is at the highest point of its trajectory, its acceleration is zero? a)the horizontal and vertical components of its velocity are zero. b) its velocity is perpendicular to the acceleration. c)the horizontal component of its velocity is zero. d)its velocity and acceleration are both zero.

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?