Chapter 14 Physics

A Satellite must stay about ______ kilometers or more above earths surface to keep from burning due to the friction of the atmosphere.

150

The orbital speed for close orbit about earth is...

8 km/s

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? a) about 28 days b) a satellite could not be put into such an orbit c) it depends on the mass of the satellite d) about an hour and a half e) none of the above

a) about 28 days

Where does a satellite in an elliptical orbit have the greatest kinetic energy? a) at the point closest to the planet b) exactly at the point halfway to the planet c) at the point farthest from the planet d) anywhere- its kinetic energy is constant e) more information needed

a) at the point closest to the planet

The speed of a satellite in a circular orbit is... a) constant b) not constant c) constantly increasing

a) constant

The Earlybird communications satellite hovers over the same point on Earth's equator indefinitely. This is because... a) its orbital period is 24 hours b) it is beyond the main pull of gravity c) it pulls as hard on Earth as earth pulls on it d) it is kept aloft by ground control e) forces other than Earth's gravity act on it

a) its orbital period is 24 hours

Minimal orbital speed about Earth is approximately 8km/s. Minimal orbit speed about the moon would be... a) less than 8km/s b) about 8km/s c) more than 8 km/s

a) less than 8 km/s

A projectile is fired vertically from the surface if earth at 10 km/s. The projectile will... a) rise and then fall back to Earth's surface b) go into an elliptical orbit about Earth c) go into a circular orbit about earth d) none of the above

a) rise and then fall back to Earth's surface

PE is greatest when the satellite is at the __________.

apogee

The point in a satellites orbit farthest from the center of the earth...

apogee

An object is placed exactly halfway between Earth and the moon. The object will fall toward.. a) the moon b) earth c) neither earth not the moon

b) earth

The force of gravity does work on a satellite when it is in... a) circular orbit b) elliptical orbit c) both A and B d) neither A nor B

b) elliptical orbit

A vertically oriented rocket that maintains a continuous upward velocity of 8 km/s will... a) not be able to escape earth b) escape earth

b) escape earth

Compared to the period of a satellite in orbit close to earth, the period of a satellite in orbit far from earth is... a) the same b) longer c) shorter d) not enough enformation

b) longer

The speed of a satellite in an elliptical orbit is... a) independent if the height if the satellite b) not constant c) constant

b) not constant

An object dropped from rest almost infinitely far from Earth falls to Earth because of Earth's gravitational field, and strikes the surface with a speed of about... a) 8 km/s b) 9.8 km/s c) 11 km/s d) none of the above

c) 11 km/s

Escape speed from the surface of Earth is about... a) 8 km/s b) 9.8 km/s c) 11.2 km/s d) 16 km/s e) it is impossible to completely escape from Earth

c) 11.2 km/s

The curvature of Earth is such that for every 8000 m tangent to the surface, the surface drops about... a) 0m b) 2.5m c) 5m d) 10m e) 20m

c) 5m

The orbital speed for a satellite orbiting very close to Earth's surface is... a) 1600 m/s b) 4900m/s c) 8000 m/s d) 16,000 m/s e) 80,000 m/s

c) 8000 m/s

A circle is a special case of... a) a hyperbola b) a parabola c) an ellipse d) a focus

c) an ellipse

The reason satellites orbit Earth at least 150 km above the surface is to... a) be above Earth's gravity b) make sure they are higher than the highest mountains c) be above Earth's atmosphere d) keep them out of the way of commercial airliners e) all of the above

c) be above Earth's atmosphere

Pluto takes a longer time to travel around the sun than Earth takes because Pluto... a) has further to go b) goes slower c) both a and b d) none of the above

c) both a and b

What remains constant for a satellite in an elliptical orbit? a) its speed b) Its potential energy c) its total energy d) its kinetic energy e) its distance from the planet

c) its total energy

A period of a satellite is defined as... a) the time for a satellite to cross the United States b) 1 second c) the time for a satellite to make one complete revolution around Earth d) 90 seconds e) 24 hours

c) the time for a satellite to make on complete revolution around Earth

The circular orbit of a satellite orbiting Earth is characterized by a constant... a) speed b) radius c) magnitude of acceleration d) all of the above e) none of the above

d) all of the above

Where does a satellite in a circular orbit have the greatest kinetic energy? a) at the point farthest from the planet b) exactly at the point halfway to the planet c) at the point closest to the planet d) anywhere- its kinetic energy is constant e) more information is needed

d) anywhere- its kinetic energy is constant

The higher satellite is, the... a) less its speed is b) greater its speed is c) longer its period is d) both A and C e) both B and C

d) both A and C

The fastest moving planet in a solar system is... a) the most massive planet b) any planet (they all move at the same speed) c) the smallest planet d) the planet nearest the sun

d) the planet nearest the sun

An ___________ is the closed path taken by a point that moves in such a way that the sum of its distances from two fixed points is constant.

ellipse

: The speed of a satellite in a circular orbit around the earth changes as it circles the earth

false

Because a satellite is always changing direction, it loses energy as it orbits the earth

false

True or False : The sum of a satellites KE and PE varies as the satellite orbits a planet

false

True or False : the rotational speed of a wheel is defined by as the munber of rotations it makes in a 10-second interval

false

PE is at the least when the satellite is at the __________.

perigee

The point in a satellite's orbit closest to the center of the earth...

perigee

For a satellite close to earth, the time for a complete orbit around earth , its ____________ is about 90 minutes.

period

A ___________ in circular orbit around earth is always moving perpendicularly to gravity and parallel to earths surface at constant speed.

satellite

An earth ________________ is a projectile moving fast enough to fall continually around earth rather than into it.

satellite

An Earth satelllite is a projectile that falls around the earth instead of falling into it.

true

Some satellites in orbit around the earth stay above the same point on the equator all the time

true

True or False : It is possible for to rotate a very large cylindrical space habitat around its central axis at just the right speed so people living inside the cylinder will experience a force that feels like gravity.

true