Answer:
The main driver of climate change is the greenhouse effect. Some gases in the Earth's atmosphere
Answer:
The average velocity has magnitude = 10 km/h , direction: east
Explanation:
In order to find the average velocity of the car we need to know the final and initial positions, and the time that took to get from one to the other.
Notice that since its movement was 60 km straight east and then from there 40 km straight west, the car is positioned at 20 km to the east of its initial departure point. therefore the vector change in position is a vector 20 km in magnitude, and direction towards the east.
Since it took the car a total of 1.33 hours plus 0.67 hours to reach its final position, the total time elapsed is: 1.33 + 0.67 hours = 2 hours.
Then,the velocity vector has magnitude; 20 km / 2 hours = 10 km/hour
As we mentioned above. the direction of the velocity vector is east.
Answer:C
Explanation: I took the quiz if you don't believe me then your gonna miss the problem.
Answer:
<em>The kinetic energy increases by a factor of 9
</em>
Explanation:
<u>Kinetic Energy
</u>
It's the energy related to the speed of an object and is calculated by the formula
Let's suppose the initial speed of the mass is 
, then the kinetic energy is
Now the speed will triple, i.e. 
. The new kinetic energy is
Thus
The kinetic energy increases by a factor of 9
Let's check with numbers: 
The relation is
The new kinetic energy is nine times the initial kinetic energy.
Answer:
Absence of light causes shadow
Explanation:
The shadow is of the black colour because it is formed by the white light from the sun. Black is the opposite colour of white. In case you use different colour of light to cast a shadow you will get a shadow of opposite colour of light used to cast shadow.
