The Moon was once closer to Earth, but the force of gravity got weaker as the Moon moved farther away.
The law of conservation of angular momentum ensured that the Moon must have the same amount of rotational angular momentum as it has of
orbital angular momentum.

2/10/2021
Homework #3 - Chapters 4 and 5
14/29
In which of the scenarios below would you feel
weightless
?
ANSWER:
Correct
Chapter 4, #23
Part A
The net force applied to an object equals its ________ (Newton's 2nd Law of Motion).
ANSWER:
Correct
Chapter 4, #24
Part A
Radiative energy is ________.
ANSWER:
Correct
Chapter 4, #25
Part A
What does
E
represent in Einstein's formula
E
=
mc
2
?
ANSWER:
while parachuting from an airplane
while walking on the Moon
while accelerating downward in an elevator
while falling from a roof
mass times velocity
mass times acceleration
mass times energy
momentum times velocity
energy from nuclear power plants
energy of motion
heat energy
energy carried by light

2/10/2021
Homework #3 - Chapters 4 and 5
15/29
Correct
Chapter 4, #26
Part A
Suppose your mass is 70 kg on Earth. On the Moon what would be your mass?
ANSWER:
Correct
Chapter 4, #27
Part A
Consider two objects with masses. According to the
universal law of gravitation
we studied in class, if you double the masses of
both
attracting objects,
then the gravitational force between them will
ANSWER:
Correct
Chapter 4, #28
Part A
the gravitational potential energy of an object held above the ground
the kinetic energy of a moving object
the electric field produced by a charge
the mass-energy, or potential energy stored in an object's mass
the radiative energy carried by light
70 kg
12 lb
70 lb
12 kg
50 kg
decrease by a factor of 4.
decrease by a factor of 2.
increase by a factor of 4.
increase by a factor of 2.
not change at all.