question:
One 7.0 kg bowling ball is lifted to a storage shelf 1.0 m above the floor. A second 7.0 kg ball is lifted to a storage shelf 2.0 m above the floor. Which of the following best explains why the measured force of gravity on each ball is nearly identical?
OPTIONS:
- The final potential energy of each ball increased.
- The amount of work required to lift each ball is identical.
- The distance of each ball from Earth's center of mass is almost identical.
- The gravitational force of each ball on the other cancels out the force of Earth's gravity.

answer:
The distance of each ball from Earth's center of mass is almost identical.

question:
Perfume sprayed from a bottle spreads more easily in a warm room of 25C than in a cool room of 15C. Which of the following correctly compares perfume molecules at 25C to those at 15C?
OPTIONS:
- At 25C, they have more mass.
- At 25C, they are moving faster.
- At 25C, they have less kinetic energy.
- At 25C, they are decreasing in volume.

answer:
At 25C, they are moving faster.

question:
Frame construction predominates in the New England area due to the abundance of
OPTIONS:
- clay.
- masonry.
- wood.
- steel.

answer:
wood.

question:
Genetically modified plants with new characteristics have been produced through genetic engineering methods. What impacts have resulted from the use of genetically modified plants?
OPTIONS:
- decreases in farm production
- decreases in corn, soybean, cottonseed, and canola oils
- increases in time required to plant, grow, and harvest crops
- increases in resistance to herbicides, insects, and viral diseases

answer:
increases in resistance to herbicides, insects, and viral diseases