Answer:
1. Earth viewed from space - Remote Sensing Test
2. Commanded first ship to sail around Earth - History Test
3. 7,900 miles mantle - Geology Test
4. Hills, valleys, rivers, plains - Geography Test
5. Layer below crust diameter at poles - Geophysics Test
6. At Earth's center landforms - Geophysics Test
7. About 3,000 types a large sphere - Astronomy Test
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.
To know more about potential energy, visit;
https://brainly.com/question/22764
#SPJ2
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.
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! :)