Problems $1$ & $2$

$(10$ points$)$ An old communications satellite will be decommissioned, and replaced with a newer model that has less mass. The newer model will be put into orbit at the same radius as the older model. The older model had a mass of $120$ kg$,$ and the new model has a

mass of $100$ kg$.$

How will the speed between the two models compare if they are both orbiting Earth?

$1.$ A The newer model will have to be moving at the same speed.

$$ The newer model will have to be moving slower.

The newer model will have to be moving faster.

D None of these are correct.

$(5$ points$)$

The radius of the Earth is $6\mathrm{.}37$ x $10^6$ m and the mass of the Earth is $5\mathrm{.}9710^24$ kg$.$

If the newer model is moving at a speed of $7450$ m$/$s$,$ how high above the surface of the Earth is it orbiting?

$2.$ A $1$x$105$m

B $4$x $105$m

None of these.

D $8$x $105$m

@ $2$x$105$m