Answer:
C. convection
Explanation:
this is the transfer of heat through liquid or gas (heat moving through air)
Blake is using a screw to hang on a picture in his room. Which of the these is the best description of a screw?
A. A screw allows you to use less force because a screw acts like a pulley.
B. A screw allows you to use less force because a screw acts like an inclined plane.
C. A screw allows you to do less work because a screw acts like a pulley.
D. A screw allows you to do less work because a screw acts like an inclined plane.
When using a screw to hang a picture, it is important to understand its function. The best description of a screw is option B - "A screw allows you to use less force because a screw acts like an inclined plane."
Screws are simple machines that have an inclined plane wrapped around a cylinder. This inclined plane is known as the thread. As the screw is turned, the thread pulls the screw into the material it is being screwed into, allowing it to hold on tightly.
Because of this design, screws are able to reduce the amount of force needed to hold an object in place. This is because the force applied to the screw is spread out over a larger area, making it easier to turn the screw and insert it into the material.
In conclusion, when using a screw to hang a picture or any other object, remember that it is an inclined plane wrapped around a cylinder, designed to reduce the amount of force needed to hold an object in place.
Answer: The answer is B! <3
Explanation:
When Blake puts a screw into his wall, it is a good description of an inclined plane. The threads of a screw act like an inclined plane to increase the distance over which you exert the input force. As the threads of the screw turn, they exert an output force on the wood, pulling the screw into the wood. So the answer is B. I hope this helped! :)
How can chemical energy be converted into mechanical energy?
A. turning on a flashlight
B. sharpening a pencil with an electric pencil sharpener
C. heating up bread in a toaster
D. eating breakfast and then going for a run
Answer: D. Eating breakfast and then going for a run.
Explanation:
Eating breakfast is a chemical change and running is a mechanical change.
Lab Report
Ocean Currents
It’s time to complete your Lab Report. Save the lab to your computer with the correct unit number, lab name, and your name at the end of the file name (e.g., U2_ Lab_OceanCurrents_Alice_Jones.doc).
Introduction
What was the purpose of the experiment?
Type your answer here:
What were the independent, dependent, and control variables in your investigation? Describe the variables for each part of the experiment.
Type your answer here:
Experimental Methods
What tools did you use to collect your data?
Type your answer here:
Write the procedure you followed for the second part of the experiment. List each step so that another student could follow the procedure and repeat your experiment.
Type your answer here:
Data and Observations
Record your observations.
Type your answer here:
Conclusions
What conclusions can you draw about how temperature and salinity affect the flow of water. Write an evidence-based claim.
Type your answer here:
Draw a diagram (develop a model) that shows what happens when warm water mixes with cold water in the ocean. Use your model to explain how this causes ocean currents.
Type your answer here:
Ocean currents are large-scale movements of water within the ocean, driven by a combination of factors such as wind, temperature, salinity, and the Earth's rotation.
What conclusions can be drawn about how salinity and temperature affect water flow?As water becomes colder, it becomes denser and sinks, while warmer water rises to the surface. Similarly, as the salinity of water increases, its density increases, and it sinks, while less salty water rises to the surface. These density differences create circulation patterns, such as ocean currents and deep water circulation, which can have a significant impact on the distribution of heat, nutrients, and other important factors in the ocean environment.
An evidence-based claim that can be drawn from this information is that changes in temperature and salinity can have significant effects on the flow of water in the ocean. For example, if temperatures in a particular region of the ocean were to increase, it could potentially cause the water to become less dense and rise to the surface, which could disrupt ocean currents and affect the distribution of nutrients and other important factors. Similarly, changes in salinity, such as those caused by freshwater influx from rivers or melting ice, could also affect the density of ocean water and impact circulation patterns.
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A student lifts a book from a desk.
How does the book’s energy change?
A. gains kinetic energy
B. gravitational potential energy increases
C. potential energy decreases
D. potential energy converted to kinetic energy
The capacity to perform work is defined as the energy. This energy can be stored in many forms. When a student lifts a book from a desk the potential energy is converted to kinetic energy. The correct option is D.
What is potential energy?The energy stored by an object or the system by virtue of its position or arrangement of the parts is defined as the potential energy. An objects potential energy depends on its physical properties and the position of a system.
The energy possessed by an object because of its motion is called the kinetic energy. The simple activities like walking, running, throwing and falling involves kinetic energy. The kinetic energy of an object depends on the mass and speed.
Here when we lift a book which is at rest in the table, it possess potential energy and when it is lifted from the table it has acquired motion and so it has kinetic energy.
Thus the correct option is D.
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