The resultant od the horizontal forces is the driving force from the engine (answer 4). Force C. is 30N, force D. is 20N, and therefore the horizontal resulting force is 30N - 20N = 10N. This is the force which makes the car driving forward, and therefore the driving force for the engine.
The pressure law states that for a constant volume of gas in a sealed container the temperature of the gas is directly proportional to its pressure.
Answer:
Potential energy because it is not moving
Explanation:
A book on the edge of Sammy's desk will have a potential energy because it is not moving.
Potential energy is the energy due to the position of a body.
- This form of energy is the energy found in a body at rest.
Potential energy = mxgxh
m is the mass of the body
g is the acceleration due to gravity
h is the height of the body
<h2>
Answer: The half-life of beryllium-15 is 400 times greater than the half-life of beryllium-13.</h2>
Explanation:
The half-life of a radioactive isotope refers to its decay period, which is the average lifetime of an atom before it disintegrates.
In this case, we are given the half life of two elements:
beryllium-13:
beryllium-15:
As we can see, the half-life of beryllium-15 is greater than the half-life of beryllium-13, but how great?
We can find it out by the following expression:
Where is the amount we want to find:
Finally:
Therefore:
The half-life of beryllium-15 is <u>400 times greater than</u> the half-life of beryllium-13.