Why is saturn almost as big as jupiter, despite its smaller mass?
a. saturn's rings make the planet look bigger. jupiter's strong magnetic field constrains its size.
b. saturn has a larger proportion of hydrogen and helium than jupiter, and is therefore less dense.
c. jupiter's greater mass compresses it more, thus increasing its density.
d. saturn is further from the sun, thus cooler, and therefore less compact.

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?

Suppose a wire with a current is pushed upward by a magnetic field. how would the wire move if the direction of the current reversed? explain your answer.

Anonzero net force acts on a particle and does work. which one of the following statements is true? the kinetic energy of the particle changes, but the speed of the particle does not change. the kinetic energy of the particle does not change, but the speed of the particle does change. the kinetic energy of the particle changes, but the velocity of the particle does not change. the kinetic energy and the speed of the particle change, but the velocity of the particle does not change. the kinetic energy, speed, and velocity of the particle change.