7. During the process of photosynthesis, plants convert carbon dioxide and water into glucose. Covalent bonds hold the glucose molecules together. The breaking of the covalent bonds during digestion releases energy. The type of energy released is (1 point)
• kinetic energy.
• electrical energy.
• potential energy.
8. Which would best reduce the amount of energy needed to pull a wagon up a ramp? (1 point)
• reducing the friction between the wagon wheels
• reducing the length of the wagon handle
• increasing the friction between the wagon wheels
9. To lift a load to the roof, you apply 21 N of force to a pulley. The pulley applies 21 N of force to the load. What is the mechanical advantage of the pulley? (1 point)
• 1
• 40
10. Carla applied a force of 35 N to a wheelbarrow full of bricks and moved it 2.5 m. Which of the following can be determined from this information? (1 point)
Hint: Multiply force by distance.
• The wheelbarrow supplied 87.5 J of work.
• The wheelbarrow has a mechanical advantage of 14.
• The wheelbarrow has 87.5 J of potential energy.
my answers:
7.kinetic energy.
8.reducing the friction between the wagon wheels
9.40
10. The wheelbarrow supplied 87.5 J of work.
nope i took the test already number 9 is actually supose to be 1
ya lorenze is right 9's 1
7. potential energy
8.reducing the friction between the wagon wheels
9.21
10.The wheelbarrow supplied 87.5 J of work.
I am taking the test but number 9 has 4 answers its
A.Nuclear Energy
B.Thermal energy
C.Electrical Energy
D.Chemical energy
I chose D but is that the answer?
Chemical energy is the answer to number 7.
To arrive at the correct answers, let's break down each question and explain how to determine the right choice.
7. The type of energy released when covalent bonds in glucose molecules are broken during digestion is potential energy. This is because breaking these bonds results in a release of stored energy within the molecules.
8. To reduce the amount of energy needed to pull a wagon up a ramp, the most effective method is to reduce the friction between the wagon wheels. Friction between the wheels and the ramp surface generates resistance and requires more energy to overcome. Therefore, by minimizing friction, less energy is needed to pull the wagon.
9. Mechanical advantage refers to the ratio of output force to input force in a simple machine, such as a pulley. In this case, since the pulley applies the same amount of force (21 N) to the load as you apply to the pulley, the mechanical advantage is 1.
10. To determine the work done by the wheelbarrow, we can use the formula: work = force × distance. In this case, the given force is 35 N, and the distance moved is 2.5 m. Multiplying these values gives us a work done by the wheelbarrow of (35 N) × (2.5 m) = 87.5 J. Therefore, the correct statement is that the wheelbarrow supplied 87.5 J of work.
So, to summarize, the correct answers are:
7. Potential energy.
8. Reducing the friction between the wagon wheels.
9. 1.
10. The wheelbarrow supplied 87.5 J of work.