Chapter 9
Which of the following quantities represent mass?
0.34 g 120 kg
Which of the following quantities would be acceptable representations of weight?
12.0 lbs 1600 kN 899 MN
What is the magnitude of the gravitational force between two 1-kg bodies that are 1 m apart?
6.67 × 10 -11 N
Newton's most celebrated synthesis was and is of A.earthly and heavenly laws. B.weight on Earth and weightlessness in outer space. C.masses and distances. D.the paths of tossed rocks and the paths of satellites.
A.earthly and heavenly laws. Comment: This synthesis provided hope that other natural phenomena followed universal laws and ushered in the "Age of Enlightenment."
Why are all tides greatest at the time of a full Moon or new Moon?
At full Moon and new Moon, the tides from the Moon and the Sun add because they are in line with Earth.
The constant G in Newton's equation is?
Makes. The units of measurement consistent.
Suppose you are in an elevator. As the elevator starts upward, its speed will increase. During this time when the elevator is moving upward with increasing speed, your weight will be?
greater than your normal weight at rest
Suppose you are in an elevator that is moving upward. As the elevator nears the floor at which you will get off, it's speed slows down. During this time when the elevator is moving upward with decreasing speed, your weight will be?
less than your normal weight at rest
After Punch Taut travels to Pentune, what actually happens to his mass and his weight?
mass remains the same; weight decreases
An object is lifted from the surface of a spherical planet to an altitude equal to the radius of the planet. As a result, which of the following changes in the properties of the object take place?
mass remains the same; weight decreases
As the falling rocket plunges toward the event horizon, an observer in the orbiting rocket would see that the falling rocket __________.
slows down as it approaches the event horizon, and never actually crosses the event horizon
If you are standing on a scale in an elevator, what exactly does the scale measure?
the force you exert on the scale (weight)
Why do astronauts float in space?
they are in free fall
The gravitational field on the surface of the earth is stronger than that on the surface of the moon. If a rock is transported from the moon to the earth, which properties of the rock change?
weight only
The universal gravitational constant, G, which links force to mass and distance, is similar to the familiar constant A.π. B.g. C.acceleration due to gravity. D.speed of uniform motion.
π. Explanation: Just as π relates the circumference of a circle to its diameter, G relates force to mass and distance.
If acceleration due to gravity on the earth is g, which formula gives the acceleration due to gravity on Loput?
G 5.6/1.7 2
Suppose you are in an elevator that is traveling upward at constant speed. How does your weight compare to your normal weight on the ground?
It is the same
If Earth shrank, but there was no change in its mass, then what would happen to your weight at the surface?
It would increase
You know that from afar we'll never see the in-falling rocket cross the event horizon, yet it will still eventually disappear from view. Why?
Its light will become so redshifted that it will be undetectable.
What was the cause of perturbations discovered in the orbit of the planet Uranus? What later discovery did this lead to?
Neptune caused the perturbations, and later Pluto was discovered.
Why does the gravity in the Space Shuttle compare with the gravity on Earth the way it does?
The Space Shuttle is about the same distance from the center of the Earth than from the surface of the Earth.
As you found in Part A, your weight will be greater than normal when the elevator is moving upward with increasing speed. For what other motion would your weight also be greater than your normal weight?
The elevator moves downward while slowing in speed.
How does the gravity in the space shuttle compare with the gravity on Earth's surface?
The gravity in the Space Shuttle is approximately equal to the gravity on the surface of the Earth.
Predict how the upward force exerted on the feet by the scale will compare to the weight if the elevator is accelerating upward. The upward force on the feet will be equal to the weight. The upward force on the feet will exceed the weight. The upward force on the feet will be less than the weight.
The upward force on the feet will exceed the weight.
Predict how the upward force exerted on the feet by the scale will compare to the man's weight if the elevator is accelerating downward?
The upward force on. The feet will be less the man's weight.
Where do you weigh more: at the bottom of Death Valley or atop one of the peaks of the Sierra Nevada? Why?
You weigh more in Death Valley because you are closer to the center of Earth.
What would the magnitude of the gravitational field be anywhere inside a hollow, spherical planet?
Zero N/kg
If you were inside the rocket that falls toward the event horizon, from your own viewpoint you would?
accelerate as you fall and cross the event horizon completely unhindered
If you were inside the rocket that falls toward the event horizon, you would notice your own clock to be running __________.
at a constant, normal rate as you approach the event horizon
