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