ch.14 Physics test review
An object dropped from rest almost infinitely far from Earth falls to Earth because of Earth's gravitational field, and strike the surface with a speed of about
11 km/s
Escape speed from the surface of Earth is ____ km/s.
11.2
the curvature of the Earth is such for every 8000 m tangent to the surface, the surface drops about ____ meters.
5
the orbital speed for a satellite orbiting very close to Earth's surface is
8,000 m/s
the orbit of a satellite is shown in the sketch. In which position A through D does the satellite have the greatest speed?
A
the orbit of a satellite is shown in the sketch. In which position A through D does the satellite have the most KE?
A
A satellite near Earth makes a full circle in about an hour and a half. How long would it take a satellite located as far away as the moon to orbit Earth?
About 28 days
It takes Pluto a long time to travel around the sun than it takes Earth because Pluto
All of the above
The orbit of a satellite is shown in the sketch. In which position A through D does the satellite have the most total energy?
All of the above
Where does a satellite Ina circular orbit have the greatest kinetic energy?
Anywhere- it's kinetic energy is constant
The orbit of a satellite is shown in the sketch. In which position A through D does the satellite have the most PE?
C
the orbit of a satellite is shown in the sketch. In which position A through D does the satellite have the least speed?
C
Kepler is credited as being the first to discover that the paths of planets around the sun are
Ellipses
A vertically oriented rocket that maintains a continuous upward velocity of 8 km/s will
Escape Earth
The lower a satellite is in orbit, the
Greater it's speed is and the shorter it's period
Energy is conserved when an Earth satellite travels
In either a circular or elliptical orbit
The Early-bird communication satellite hovers over the same point on Earth's equator indefinitely. This is because
It's orbital period is 24 hours
What remains constant for a satellite in an elliptical orbit?
It's total energy
The higher a satellite is in orbit, the
Less it's speed is and the longer it's period
Minimal orbital speed about the Earth is approximately 8 km/s. Minimal orbital speed about the moon would be ____ 8 km/s.
Less than
Would a cannonball fired upward at 8 km/s go into Earth orbit?
No
When a projectile achieves escape speed from Earth, it
Outruns the influence of Earth's gravity, but is never beyond it.
The fastest moving planet in our solar system is the
Planet nearest the sun
A projectile is fired vertically from the surface of Earth at 10 km/s. The projectile will
Rise and then fall back to Earth's surface
An object is placed exactly halfway between Earth and the moon. The object will fall toward
The Earth
the circular orbit of a satellite orbiting Earth is characterized by a constant
all the above
the reason satellites orbit Earth at least 150 km above the surface is to
be above Earth's atmosphere
when a satellite travels at constant speed, its shape is a (n)
circle
the speed of a satellite in a circular orbit is
constant
a circle is a special case of a (n)
ellipse
the force of gravity does work on a satellite when it is in _____ orbit.
elliptical
a satellite in elliptical orbit Earth travels
fastest when it moves closer to Earth
a projectile is fired vertically from the surface of Earth and placed in a horizontal orbit at 10 km/s. The projectile will
go into an elliptical orbit about Earth
compared to the period of a satellite in orbit close to Earth, the period of a satellite in orbit far from Earth is
longer
when you toss a projectile sideways, it curves as it falls. It will be an Earth satellite if the curve it follows
matches the curve of planet Earth
a period of a satellite is defined as
the time for a satellite to make one complete revolution
the speed of a satellite in an elliptical orbit
varies
