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}