PHY 101 Ch 9 HW
f the acceleration due to gravity on the earth is 9.8 m/s, what is the acceleration due to gravity on Rams?
5.7 m/s^2
What is the magnitude of the gravitational force between two 1-kg bodies that are 1 m apart?
6.67 × 10 ^-11 N
Predict how the upward force exerted on the feet by the scale will compare to the weight of the man if the elevator is moving upward at a constant speed.
The upward force on the feet will be equal to the man's weight.
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.
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 than the man's 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 upward.
The upward force on the feet will exceed the man's weight.
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
Consider Earth and the Moon. As you should now realize, the gravitational force that Earth exerts on the Moon is equal and opposite to that which the Moon exerts on Earth. Therefore, according to Newton's second law of motion __________.
the Moon has a larger acceleration than Earth, because it has a smaller mass
If you are standing on a scale in an elevator, what exactly does the scale measure?
the force you exert on the scale
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
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
Predict how the upward force exerted on the feet by the scale will compare to the man's weight if the elevator is moving downward at a constant speed.
The upward force on the feet will be equal to the man's weight.
Which planet should Punch travel to if his goal is to weigh in at 118 lb? Refer to the table of planetary masses and radii given to determine your answer.
Pentune
Why does the gravity in the Space Shuttle compare with the gravity on Earth the way it does?
The Space Shuttle and the surface of the Earth are about the same distance from the center of the Earth.
Why do the astronauts in the Space Shuttle float around?
The Space Shuttle is in free fall, so the shuttle and the astronauts inside it are continuously falling toward the Earth. They thus experience apparent weightlessness.
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.
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 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. 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, its 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
The constant G in Newton's equation _______.
makes the units of measurement consistent
