Answer:
42.99°
Explanation:
= Kinetic friction force
= Pulling force at angle 
= Weight of the box = 150 N
Kinetic friction force
Pulling force at angle
N = Pulling force
According to question
Applying Newton's second law in the vertical direction we get
The angle is 42.99°
Answer:
The street applies a force of 20,000 N on the car.
Explanation:
Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. The car applies the same amount of force to the street as the street to the car.
The figure shown below illustrates a lever being used to lift a weight W.
The applied force is F.
In order to lift the weight, the minimum applied force is
F*b = W*a
F = (a/b)W
When the ratio a/b < 1, then the applied force is less than the weight.
The principle behind the use of a lever is to keep the ratio a/b small in order to decrease the effort force.
Answer: A
A lever is used to decrease effort force.
They maintain the same distance between each other throughout the fall
Answer:
Explanation:
Both increase in temperature and availability of water drives physical and chemical weathering and increases their rate.
Increase in temperature causes rocks to expand and molecules are more free to move about. Constantly heating and cooling of a rock can lead to mechanical fracturing or cracks developing.
A high amount of rainfall facilitates chemical weathering. Chemical weathering is the decomposition of rocks.
The main agent that is important for natural chemical processes to occur is the presence water.
Water contains some other dissolved substances in it.
This is evident in tropical regions of the world
