ASTRONOMY 101 EXAM 2
Match the physics principle with its effect on the cloud of gas and dust in the
nebular hypothesis:
1. Gravity
2. Conservation of Angular Momentum
1. Pulls material towards the center
2. Slows the contraction perpendicular to the axis of rotation
What evidence is there that planets formed from collisions?
Cratering
How are radius and velocity related in the context of the conservation of angular
momentum?
Inversely Related
Normally mass is also conserved in closed systems in which angular momentum
is conserved. However if angular momentum is conserved while mass is added
to a system and the radius of the system is constant what will happen to the
velocity?
Decrease
,A very large cloud of dust and gas with a radius of 3x10^12 m has an angular
velocity of just 2 m/s.
If all of the mass of the cloud contracts to form a protostar with a radius of
6x10^3 m what is the resulting rotational velocity of the protostar?
1x10^9 m/s
An ice skater of mass mi begins a spin with a rotational velocity of vi and a
radius ri. When the ice skater pulls in their arms their radius decreases by a
factor of 4.
What is the new rotational velocity of the ice skater?
4vi
Earth: Most Orbital Angular Momentum
Venus: Middle Orbital Angular Momentum
Mars: Least Orbital Angular Momentum
Using the table of information about the planets below rank the planets from
most orbital angular momentum to least orbital angular momentum.
-Note that the masses are given in terms of the mass of the Earth (ME ). Radius is
given in Astronomical Units (AU) and velocity is in kilometers per second (km/s)
, Match the solar system object with the composition of its atmosphere:
1. Mercury
2. Jupiter
3. Pluto
4. Venus
1. No atmosphere, too hot
2. Primarily hydrogen atmosphere
3. No atmosphere, too cold
4. Primarily carbon dioxide atmosphere
What is the maximum mass that an object can have and still be eligible to be a
planet?
13 times the mass of Jupiter
Match the detection method with what scientists are observing to determine
the existence of an exoplanet:
1. Direct Imaging Method
2. Radial Velocity Method
3. Transit Method
4. Precision Astrometry Method
5. Gravitational Microlensing Method
1. Reflection of light from the planet
Match the physics principle with its effect on the cloud of gas and dust in the
nebular hypothesis:
1. Gravity
2. Conservation of Angular Momentum
1. Pulls material towards the center
2. Slows the contraction perpendicular to the axis of rotation
What evidence is there that planets formed from collisions?
Cratering
How are radius and velocity related in the context of the conservation of angular
momentum?
Inversely Related
Normally mass is also conserved in closed systems in which angular momentum
is conserved. However if angular momentum is conserved while mass is added
to a system and the radius of the system is constant what will happen to the
velocity?
Decrease
,A very large cloud of dust and gas with a radius of 3x10^12 m has an angular
velocity of just 2 m/s.
If all of the mass of the cloud contracts to form a protostar with a radius of
6x10^3 m what is the resulting rotational velocity of the protostar?
1x10^9 m/s
An ice skater of mass mi begins a spin with a rotational velocity of vi and a
radius ri. When the ice skater pulls in their arms their radius decreases by a
factor of 4.
What is the new rotational velocity of the ice skater?
4vi
Earth: Most Orbital Angular Momentum
Venus: Middle Orbital Angular Momentum
Mars: Least Orbital Angular Momentum
Using the table of information about the planets below rank the planets from
most orbital angular momentum to least orbital angular momentum.
-Note that the masses are given in terms of the mass of the Earth (ME ). Radius is
given in Astronomical Units (AU) and velocity is in kilometers per second (km/s)
, Match the solar system object with the composition of its atmosphere:
1. Mercury
2. Jupiter
3. Pluto
4. Venus
1. No atmosphere, too hot
2. Primarily hydrogen atmosphere
3. No atmosphere, too cold
4. Primarily carbon dioxide atmosphere
What is the maximum mass that an object can have and still be eligible to be a
planet?
13 times the mass of Jupiter
Match the detection method with what scientists are observing to determine
the existence of an exoplanet:
1. Direct Imaging Method
2. Radial Velocity Method
3. Transit Method
4. Precision Astrometry Method
5. Gravitational Microlensing Method
1. Reflection of light from the planet
