Kepler's Laws
Answer the following questions. Mark on the screen. You may change
your mind and re-mark before you hit the "grade test" button.
#1
A satellite is in an elliptical orbit about a planet as shown. If its speeds at the four labelled points are v
a
, v
b
, v
c
, and v
d
, which of the following is/are true?
a.
v
a
> v
b
> v
c
> v
d
b.
v
a
< v
b
< v
c
< v
d
c.
v
a
> v
b
= v
d
> v
c
d.
v
a
< v
b
= v
d
< v
c
e.
None of these.
#2
A new satellite (m = 2200 kg) is to be used for Earth observation. It is to be in a circular orbit at an
altitude
of 1.3 x 10
7
m. What will be its period?
a.
4.1 hours
b.
7.5 hours
c.
24.0 hours
d.
447 hours
#3
Suppose satellites GP1 and GP2 are both in circular orbits around the Earth. If GP1 has an orbital radius four times that of GP2, what is the period T
1
of GP1âs orbit compared to the period T
2
of GP2?
a.
one eighth of T
2
b.
one quarter of T
2
c.
half of T
2
d.
twice T
2
e.
four times T
2
f.
eight times T
2
