APHY 101 5 TEST PAPER QUESTIONS AND SOLUTIONS GRADED A A+
⩥ In an elliptical orbit around the Earth, you will have the maximum
energy of position when you're at. Answer: Apogee or Apoapsis
⩥ Earth's seasons are caused by. Answer: the tilt of the Earths rotation
axis
⩥ During most of the MESSENGER probe's journey from Earth to
Mercury, it was. Answer: speeding up with respect to the sun
⩥ You are orbiting the Sun and fire your engines at perihelion to SPEED
UP. As a result:. Answer: aphelion increases, perihelion stays the same
⩥ During a launch, the energy in your fuel is being converted into.
Answer: heat, energy of position, energy of motion
⩥ For the first few seconds after liftoff, which forces are important?.
Answer: Gravity and thrust
, ⩥ You're orbiting the Earth every 2 hours, and then you make a
maneuver that increases your orbital speed. Your NEW orbit will have a
period that is. Answer: more than 2 hours
⩥ You're orbiting the Earth at 7.8 km/sec in a circular orbit. If you slow
down to 7.7 km/sec, your new orbit will be circular but will be a bit
closer to the Earth. (T/F). Answer: F - In many situations, if you slow
down, you will fall into a lower orbit (but note, if you started in a
circular orbit, the new orbit will be elliptical - that's the first reason the
answer is FALSE here). Also, in this case, you need to remember that
7.8 km/sec is the MINIMUM speed required to be in the lowest possible
Earth orbit. If you slow down a little bit, your new orbit will become an
ellipse with the perigee INSIDE THE EARTH! In other words, your
flight will become suborbital and you will fall to the ground.
⩥ You're in an elliptical orbit around the Earth. At perigee you increase
your speed from 11 km/sec to 12 km/sec. The new orbit will be an
elliptical orbit with a higher apogee. (T/F). Answer: F - In some cases,
speeding up will get you to a larger elliptical orbit with a higher perigee.
But remember that 11.2 km/sec is the Earth's ESCAPE SPEED - beyond
this, the orbit changes shape and becomes hyperbolic. No apogee!
⩥ Your spacecraft is heading east in an orbit around the Earth. You want
to get to a higher orbit. To make this maneuver you must first make sure
that your nozzle is facing. Answer: West - Another question that tests
you on multiple concepts. To get to a higher (larger) orbit you know you
⩥ In an elliptical orbit around the Earth, you will have the maximum
energy of position when you're at. Answer: Apogee or Apoapsis
⩥ Earth's seasons are caused by. Answer: the tilt of the Earths rotation
axis
⩥ During most of the MESSENGER probe's journey from Earth to
Mercury, it was. Answer: speeding up with respect to the sun
⩥ You are orbiting the Sun and fire your engines at perihelion to SPEED
UP. As a result:. Answer: aphelion increases, perihelion stays the same
⩥ During a launch, the energy in your fuel is being converted into.
Answer: heat, energy of position, energy of motion
⩥ For the first few seconds after liftoff, which forces are important?.
Answer: Gravity and thrust
, ⩥ You're orbiting the Earth every 2 hours, and then you make a
maneuver that increases your orbital speed. Your NEW orbit will have a
period that is. Answer: more than 2 hours
⩥ You're orbiting the Earth at 7.8 km/sec in a circular orbit. If you slow
down to 7.7 km/sec, your new orbit will be circular but will be a bit
closer to the Earth. (T/F). Answer: F - In many situations, if you slow
down, you will fall into a lower orbit (but note, if you started in a
circular orbit, the new orbit will be elliptical - that's the first reason the
answer is FALSE here). Also, in this case, you need to remember that
7.8 km/sec is the MINIMUM speed required to be in the lowest possible
Earth orbit. If you slow down a little bit, your new orbit will become an
ellipse with the perigee INSIDE THE EARTH! In other words, your
flight will become suborbital and you will fall to the ground.
⩥ You're in an elliptical orbit around the Earth. At perigee you increase
your speed from 11 km/sec to 12 km/sec. The new orbit will be an
elliptical orbit with a higher apogee. (T/F). Answer: F - In some cases,
speeding up will get you to a larger elliptical orbit with a higher perigee.
But remember that 11.2 km/sec is the Earth's ESCAPE SPEED - beyond
this, the orbit changes shape and becomes hyperbolic. No apogee!
⩥ Your spacecraft is heading east in an orbit around the Earth. You want
to get to a higher orbit. To make this maneuver you must first make sure
that your nozzle is facing. Answer: West - Another question that tests
you on multiple concepts. To get to a higher (larger) orbit you know you
