For the image below, which values for the charges on the two pith balls could be correct? q1 = +3.7 × 10−6 C; q2 = +3.7 × 10−6 C
q1 = −4.0 × 10−6 C; q2 = +3.5 × 10−6 C
q1 = −4.0 × 10−6 C; q2 = −3.5× 10−6 C
q1 = +3.7 × 10−6 C; q2 = 0.0 × 10−6 C

Amass has an acceleration of 10- 2t. what is its velocity and displacement if it started at x- 4m and the initial velocity was 8m/s? at what time does it have 0 velocity? graph all graphs.

Moon effect. some people believe that the moon controls their activities. if the moon moves from being directly on the opposite side of earth from you to being directly overhead, by what percentage does (a) the moon's gravitational pull on you increase and (b) your weight (as measured on a scale) decrease? assume that the earth–moon (center-to-center) distance is 3.82 × 10^8 m, earth's radius is 6.37 × 10^6 m, moon's mass is 7.36 × 10^22 kg, and earth's mass is 5.98 × 10^24 kg.

After a big snowfall, you take your favorite rocket-powered sled out to a wide field. the field is 195 m across, and you know that your sled accelerates at a rate of 3.65 m/s2 when the rocket is on. how much time will it take the sled to cross the field starting from rest, assuming the rocket is on the whole time?