Physics Chapter 9

Which of the following quantities represent mass?

0.34g and 120kg

c) How many square meters will be illuminated if the wall is 10m from the light source?

100m2

Suppose you stood atop a ladder so tall that you were 4 times as far from Earth's center as you presently are. Find the change in your weight

16

Which of the following quantities would be acceptable representations of weight?

1600kN and 899 MN

What is the magnitude of the gravitational force between two 1-kg bodies that are 1 m apart?

6.67 x 10^-11 N

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.

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

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

c) 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.

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

If Earth shrank, but there was no change in its mass, then what would happen to your weight at the surface?

increase

The constant G in Newton's equation _______

makes the units of measurement consistent

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

Is gravitational force acting on a person who falls off a cliff?

yes

Is gravitational force acting on an astronaut inside an orbiting space shuttle?

yes

What would the magnitude of the gravitational field be anywhere inside a hollow, spherical planet?

zero

F=Gm1m2/d2 Calculate the force of gravity on the 1-kg mass if it were 6.4×10^6m above Earth's surface (that is, if it were two Earth radii from Earth's center).

2.4N

b) How many square meters will be illuminated if the wall is 5m from the light source?

25m2

Find the change in the gravitational force between two planets if the masses of both planets are doubled but the distance between them stays the same.

4

If the acceleration due to gravity on the earth is 9.8 m/s2, what is the acceleration due to gravity on Rams?

5.7 m/s2

a) A small light source located 1 m in front of a 1-m2 opening illuminates a wall behind. If the wall is 1m behind the opening (2m from the light source), the illuminated area covers 4 m2. How many square meters will be illuminated if the wall is 3m from the light source?

9m2

a) 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.

b) 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.

d) 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.

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.

If acceleration due to gravity on the earth is g which formula gives the acceleration due to gravity on Loput?

g5.6/1.7^2

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

Is there change in the force of gravity between two objects when their masses are doubled and the distance between them is also doubled?

no