From one object's center of gravity to the other's
The substance is DNA and it would be found in the nucleus.
Answer:
B) The car at point C has less kinetic energy than the car at point B.
Explanation:
We have two types of energy involved in this situation:
- Gravitational potential energy: this is the energy related to the heigth of the car, and it is given by 
, where m is the mass of the car, g is the gravitational acceleration, and h is the heigth of the car. The potential energy is higher when the car is located higher above the ground.
- Kinetic energy: this is the energy due to the motion of the car, and it is given by 
, where m is the mass of the car and v is its speed. The kinetic energy is higher when the speed of the car is higher.
- The law of conservation of energy states that the total mechanical energy of the car (sum of potential energy and kinetic energy: 
) is constant). This implies that when the car is at a higher point, the kinetic energy is less (because U is larger, so K must be smaller), while when the car is at a lower point, the kinetic energy is larger.
- Based on what we have written so far, we can conclude that the correct statement is:
B) The car at point C has less kinetic energy than the car at point B.
Because the car at point C is located at a higher point than point B, so the car at point C has larger potential energy than at point B, which implies that car at point C has less kinetic energy than the car at point B.
(B) 1.00 m
Explanation:
Since the meter stick is traveling with Jill, it will have the same speed as she does so relative to Jill, the meter stick is stationary so its length remains 1.00 m as measured by her.
Answer: at the center of curvature of the mirror on the same side of the mirror as the object
A concave mirror has a reflective surface that is curved inwards. This type of mirrors reflects the light making it converge in a focal point, therefore they are used to focus the light.
This occurs because the light is reflected with different angles, since the normal to the surface varies from one point to another of the mirror.
Nevertheless, it is important to note the object must be within the radius of curvature of the mirror.
In addition, it is important to state clear the following:
-If the object is at a distance greater than the focal distance, a <u>real</u> and <u>inverted image</u> is formed that may be greater or less than the object.
-If the object is at a distance smaller than the focal distance, a <u>virtual</u> image is formed, <u>right and larger than the object</u>.
In this case the object is placed a great distance (it can be said at infinite) from the concave mirror, hence the image formed will be real, inverted and smaller than the object.
When we say <u>real</u>, it means the image is formed in the same side of the mirror as the object and the image can be seen on a screen.
