Chapter 7 & 8
Compared to a sidereal month, the time from one full Moon to the next is
longer by 25.5 days
An ion rocket engine produces 100 Newtons of thrust. What acceleration can it give to a space probe with a mass of 10,000kg?
0.1m/s
What total force will cause an object with a mass of 5kg to gain 10 meters per second every second?
5 Newtons
You would expect to see a waxing crescent Moon
Setting in the West right after the Sun
You are standing in an elevator that is accelerating upward at 1m/s². Which of the following pairs of forces is an action-reaction pair that has to be exactly equal and opposite to each other?
The force that the floor of the elevator exerts on you and the force that you exert on the floor of the elevator.
Which of the following phases of the Moon would be seen high in the south at dawn?
Waning quarter
You see a waning Gibbous Moon directly south. What time will it be?
about 3am
When Galileo wanted to understand how falling objects move, he did all of the things on the following list. Choose the one thing that is very different from the way that the ancient greeks approached the subject. He
built inclined planes and measured how balls roll down them
If the acceleration of an object is zero, its speed
is not changing
From his observations of the phases of Venus, Galileo concluded that the Ptolemaic model of planetary motion was wrong because it predicted
that there could never be a Full Venus, but Galileo saw one
When Galileo dropped a wooden ball and a heavier iron ball at the same time, he found that
the iron ball always hit long before the wooden one
If you are told that a 20 kilogram object is raised by 10 meters, you know that
the mass of the object is 20 kilograms
When Newton calculated the magnitude and direction of the acceleration for a planet that was following Kepler's Laws, he found that the direction of the acceleration was
toward the sun
The Law of Inertia says that if an object is not acted on by any outside force, its acceleration
will always be zero
